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@@ -1,661 +0,0 @@
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-using Masuit.Tools.Mapping.Exceptions;
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-using Masuit.Tools.Mapping.Helper;
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-using Masuit.Tools.Mapping.Visitor;
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-using System;
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-using System.Collections;
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-using System.Collections.Generic;
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-using System.Collections.ObjectModel;
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-using System.Linq;
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-using System.Linq.Expressions;
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-using System.Reflection;
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-
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-namespace Masuit.Tools.Mapping.Core
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-{
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- /// <summary>
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- /// mapper配置基类
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- /// </summary>
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- public abstract class MapperConfigurationBase
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- {
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- private Delegate _delegateCallForNew;
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-
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- private Delegate _delegateCallForExisting;
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-
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- private Func<Type, object> _constructorFunc;
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-
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- private bool _isInitialized;
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- private readonly MethodInfo _selectMethod;
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-
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- private readonly MethodInfo _toListMethod;
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-
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- private readonly List<PropertyInfo> _propertiesToIgnore;
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-
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- internal ParameterExpression paramClassSource;
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- internal MapperExpressionVisitor visitorMapper;
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- internal List<MemberAssignment> memberForNew;
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- internal LambdaExpression expressionForExisting;
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-
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- /// <summary>
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- /// 属性映射对应关系<br/>
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- /// Item1 : 源表达式<br/>
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- /// Item2 : 目标表达式<br/>
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- /// Item3 : 检查null值<br/>
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- /// Item4 : mapper别名<br/>
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- /// </summary>
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- protected List<Tuple<Expression, Expression, bool, string>> PropertiesMapping { get; private set; }
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-
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-
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- /// <summary>
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- /// 需要被忽略映射的属性
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- /// </summary>
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- protected ReadOnlyCollection<PropertyInfo> PropertiesToIgnore => _propertiesToIgnore.AsReadOnly();
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-
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- /// <summary>
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- /// 是否使用服务依赖注入
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- /// </summary>
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- public bool UseServiceLocator { get; protected set; }
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-
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- /// <summary>
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- /// 对象源类型
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- /// </summary>
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- public Type SourceType { get; }
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-
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- /// <summary>
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- /// 对象目标类型
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- /// </summary>
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- public Type TargetType { get; }
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-
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- /// <summary>
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- /// 获取mapper映射成员
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- /// </summary>
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- public ReadOnlyCollection<MemberAssignment> MemberToMapForNew => new ReadOnlyCollection<MemberAssignment>(memberForNew);
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-
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-
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- /// <summary>
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- /// mapper别名
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- /// </summary>
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- public string Name { get; protected set; }
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-
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- /// <summary>
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- /// 构造函数
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- /// </summary>
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- /// <param name="source">源类型</param>
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- /// <param name="destination">目标类型</param>
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- /// <param name="paramName">属性名</param>
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- /// <param name="name">别名</param>
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- protected MapperConfigurationBase(Type source, Type destination, string paramName, string name = null)
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- {
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- TargetType = destination;
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- SourceType = source;
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- paramClassSource = Expression.Parameter(source, paramName);
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- Name = string.IsNullOrEmpty(name) ? paramName : name;
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- _propertiesToIgnore = new List<PropertyInfo>();
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- PropertiesMapping = new List<Tuple<Expression, Expression, bool, string>>();
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- visitorMapper = new MapperExpressionVisitor(paramClassSource);
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- memberForNew = new List<MemberAssignment>();
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- _selectMethod = typeof(Enumerable).GetMethods().Where(m => m.Name == "Select").Select(x => x.GetParameters().First(p => p.Name.Equals("selector") && p.ParameterType.GetGenericArguments().Length == 2)).First().Member as MethodInfo;
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- _toListMethod = typeof(Enumerable).GetMethod("ToList");
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- }
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-
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- /// <summary>
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- /// 获取mapper委托
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- /// </summary>
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- /// <returns></returns>
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- public Delegate GetDelegate()
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- {
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- if (!_isInitialized)
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- {
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- throw new MapperNotInitializedException(SourceType, TargetType);
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- }
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-
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- // 因为在这里有映射器的性能问题,而缓存委托会显着缩短处理时间,如果没有表达式编译每次编译会很慢
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- return _delegateCallForNew ??= Expression.Lambda(GetMemberInitExpression(), paramClassSource).Compile();
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- }
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-
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- /// <summary>
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- /// 获取现有目标类型的委托。
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- /// </summary>
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- /// <exception cref="MapperNotInitializedException"></exception>
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- public Delegate GetDelegateForExistingTarget()
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- {
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- if (!_isInitialized)
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- {
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- throw new MapperNotInitializedException(SourceType, TargetType);
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- }
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-
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- // 因为在这里有映射器的性能问题,而缓存委托会显着缩短处理时间,如果没有表达式编译每次编译会很慢
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- if (_delegateCallForExisting == null)
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- {
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- CreateMemberAssignementForExistingTarget();
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- }
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-
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- return _delegateCallForExisting;
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- }
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-
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- /// <summary>
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- /// 获取泛型的Lambda表达式
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- /// </summary>
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- public LambdaExpression GetGenericLambdaExpression()
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- {
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- return Expression.Lambda(GetMemberInitExpression(), paramClassSource);
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- }
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-
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- /// <summary>
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- /// 获取目标类型的实际类型
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- /// </summary>
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- public Type GetDestinationType()
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- {
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- return GetRealType(TargetType);
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- }
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-
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- /// <summary>
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- /// 忽略目标类型的属性
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- /// </summary>
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- /// <typeparam name="TDest">对象源类型</typeparam>
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- /// <typeparam name="TProperty">对象目标类型</typeparam>
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- /// <param name="propertyDest">目标对象的属性</param>
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- /// <returns></returns>
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- protected MapperConfigurationBase IgnoreBase<TDest, TProperty>(Expression<Func<TDest, TProperty>> propertyDest)
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- {
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- // 添加到映射列表并且可以继续操作
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- _propertiesToIgnore.Add(GetPropertyInfo(propertyDest));
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- return this;
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- }
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-
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- /// <summary>
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- /// 获取映射器实例
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- /// </summary>
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- /// <param name="typeOfSource">源类型</param>
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- /// <param name="typeOfTarget">目标类型</param>
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- /// <param name="throwExceptionOnNoFound">如果没找到是否需要抛出异常</param>
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- /// <param name="name">mapper别名</param>
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- /// <returns></returns>
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- /// <exception cref="NoFoundMapperException"></exception>
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- protected static MapperConfigurationBase GetMapper(Type typeOfSource, Type typeOfTarget, bool throwExceptionOnNoFound, string name = null)
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- {
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- var mapperExterne = MapperConfigurationCollectionContainer.Instance.Find(typeOfSource, typeOfTarget, name);
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- // 如果没有任何配置,手动抛出异常
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- if (mapperExterne == null && throwExceptionOnNoFound)
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- {
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- throw new NoFoundMapperException(typeOfSource, typeOfTarget);
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- }
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-
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- return mapperExterne;
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- }
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-
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- /// <summary>
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- /// 创建公共成员
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- /// </summary>
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- protected void CreateCommonMember()
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- {
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- PropertyInfo[] propertiesSource = SourceType.GetProperties();
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- foreach (PropertyInfo propSource in propertiesSource)
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- {
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- PropertyInfo propDest = TargetType.GetProperty(propSource.Name);
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- if (propDest != null)
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- {
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- // 检查是否已存在或被忽略。
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- bool ignorePropDest = _propertiesToIgnore.Exists(x => x.Name == propDest.Name) || PropertiesMapping.Exists(x => GetPropertyInfo(x.Item2).Name == propDest.Name);
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-
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- if (propDest.CanWrite && !ignorePropDest)
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- {
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- Type sourceType = propSource.PropertyType;
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- Type destType = propDest.PropertyType;
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- bool isList = IsListOf(destType);
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- if (isList)
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- {
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- sourceType = TypeSystem.GetElementType(propSource.PropertyType);
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- destType = TypeSystem.GetElementType(propDest.PropertyType);
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- }
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-
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- var canCreateConfig = CanCreateConfig(sourceType, destType);
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- if (canCreateConfig.CanCreate)
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- {
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- // 只创造现有的关系
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- Expression expSource = Expression.MakeMemberAccess(paramClassSource, propSource);
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- ParameterExpression paramDest = Expression.Parameter(TargetType, "t");
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- Expression expDest = Expression.MakeMemberAccess(paramDest, propDest);
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- PropertiesMapping.Add(Tuple.Create(expSource, expDest, false, canCreateConfig.MapperName));
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- }
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- }
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- }
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- }
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- }
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-
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- private static CreateConfig CanCreateConfig(Type typeSource, Type typeTarget)
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- {
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- var result = new CreateConfig
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- {
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- CanCreate = typeSource == typeTarget
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- };
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- //不是同一类型
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- if (!result.CanCreate)
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- {
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- //查找是否存在映射器
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- var mapper = MapperConfigurationCollectionContainer.Instance.Find(typeSource, typeTarget);
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- if (mapper != null)
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- {
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- result.MapperName = mapper.Name;
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- result.CanCreate = true;
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- }
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- }
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-
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- return result;
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- }
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-
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- /// <summary>
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- /// 检查并配置mapper
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- /// </summary>
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- /// <param name="configExpression">配置表达式树</param>
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- /// <exception cref="NotSameTypePropertyException">
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- /// </exception>
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- /// <exception cref="ReadOnlyPropertyException"></exception>
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- protected void CheckAndConfigureMapping(ref Tuple<Expression, Expression, bool, string> configExpression)
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- {
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- Type typeSource = configExpression.Item1.Type;
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- Type typeTarget = configExpression.Item2.Type;
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-
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- // 正常情况下,目标表达式是一个成员表达式树
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- var propTarget = GetPropertyInfo(configExpression.Item2);
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- if (propTarget.CanWrite)
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- {
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- CheckAndRemoveMemberDest(propTarget.Name);
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- if (!IsListOf(typeTarget))
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- {
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- CreatBindingFromSimple(ref configExpression, typeSource, typeTarget, propTarget);
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- }
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- else
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- {
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- CreateBindingFromList(ref configExpression, typeSource, typeTarget, propTarget);
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- }
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- }
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- else
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- {
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- throw new ReadOnlyPropertyException(propTarget);
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- }
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- }
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-
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- /// <summary>
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- /// 检查并移除目标成员
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- /// </summary>
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- /// <param name="properyName">属性名</param>
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- protected void CheckAndRemoveMemberDest(string properyName)
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- {
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- Predicate<MemberAssignment> exp = m => m.Member.Name == properyName;
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- if (memberForNew.Exists(exp))
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- {
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- memberForNew.RemoveAll(exp);
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- }
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- }
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-
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- /// <summary>
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- /// 获取成员初始化表达式。
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- /// </summary>
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- /// <returns></returns>
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- protected MemberInitExpression GetMemberInitExpression()
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- {
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- return Expression.MemberInit(Expression.New(GetDestinationType()), MemberToMapForNew);
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- }
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-
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- /// <summary>
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- /// 创建成员绑定。
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- /// </summary>
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- /// <param name="propertyExpression">属性表达式</param>
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- /// <param name="propertyTarget">目标属性</param>
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- /// <param name="checkIfNull">是否检查null值</param>
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- protected void CreateMemberBinding(Expression propertyExpression, MemberInfo propertyTarget, bool checkIfNull)
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- {
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- // 访问表达式进行转换
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- memberForNew.Add(Expression.Bind(propertyTarget, visitorMapper.Visit(propertyExpression, checkIfNull)));
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- }
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-
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- /// <summary>
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- /// 将表达式源的映射分配给属性目标。
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- /// </summary>
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- /// <param name="getPropertySource">属性源类型</param>
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- /// <param name="getPropertyDest">属性目标类型</param>
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- /// <param name="checkIfNull">是否检查null值</param>
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- /// <param name="name">要使用的映射器的别名</param>
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- internal MapperConfigurationBase ForMemberBase(Expression getPropertySource, Expression getPropertyDest, bool checkIfNull, string name = null)
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- {
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- // 添加到映射列表并且可以继续操作
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- PropertiesMapping.Add(Tuple.Create(getPropertySource, getPropertyDest, checkIfNull, name));
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- return this;
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- }
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-
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- /// <summary>
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- /// 获取属性信息。
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- /// </summary>
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- /// <param name="propertyExpression">属性表达式树</param>
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- /// <returns></returns>
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- /// <exception cref="System.NotImplementedException">
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- /// 这种表达方式不承担职责,或者这种类型的表达式是无效的
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- /// </exception>
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- protected static PropertyInfo GetPropertyInfo(Expression propertyExpression)
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- {
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- var expressionToAnalyse = propertyExpression.NodeType == ExpressionType.Lambda ? (propertyExpression as LambdaExpression).Body : propertyExpression;
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- switch (expressionToAnalyse.NodeType)
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- {
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- case ExpressionType.Convert:
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- Expression operand = (expressionToAnalyse as UnaryExpression).Operand;
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- return operand.NodeType switch
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- {
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- ExpressionType.MemberAccess => ((operand as MemberExpression).Member as PropertyInfo),
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- _ => throw new NotImplementedException("这种表达方式目前尚未支持")
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- };
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- case ExpressionType.MemberAccess:
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- return (expressionToAnalyse as MemberExpression).Member as PropertyInfo;
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- default:
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- throw new NotImplementedException("这种表达方式目前尚未支持");
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- }
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- }
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-
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- internal void Initialize(Func<Type, object> constructor)
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- {
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- CreateMappingExpression(constructor);
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- CreateMemberAssignementForExistingTarget();
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- }
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-
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- /// <summary>
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- /// 为现有目标对象创建成员
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- /// </summary>
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- public virtual void CreateMemberAssignementForExistingTarget()
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- {
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- if (PropertiesMapping.Count <= 0)
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- {
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- return;
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- }
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-
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- // 用于更改原始表达式的参数。
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- var paramTarget = Expression.Parameter(TargetType, paramClassSource.Name.Replace("s", "t"));
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- var finalAssign = new List<Expression>();
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-
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- foreach (var item in PropertiesMapping)
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- {
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- var propToAssign = new ChangParameterExpressionVisitor(paramTarget).Visit(item.Item2);
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- var assignExpression = new ChangParameterExpressionVisitor(paramClassSource).Visit(item.Item1);
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- var sourceType = TypeSystem.GetElementType(item.Item2.Type);
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- var targetType = TypeSystem.GetElementType(item.Item1.Type);
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- if (string.IsNullOrEmpty(item.Item4))
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- {
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- object defaultValue = MapperHelper.GetDefaultValue(item.Item2.Type);
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- Expression defaultExpression = Expression.Constant(defaultValue, item.Item2.Type);
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- Expression checkIfNull = Expression.NotEqual(assignExpression, defaultExpression);
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- if (item.Item3)
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- {
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- Expression setIf = Expression.IfThen(checkIfNull, Expression.Assign(propToAssign, assignExpression));
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- finalAssign.Add(setIf);
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- }
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- else
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- {
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- if (!IsListOf(propToAssign.Type))
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- {
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- finalAssign.Add(Expression.Assign(propToAssign, assignExpression));
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- }
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- else
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- {
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- if (sourceType == targetType)
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- {
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- Expression toListExp = Expression.Call(_toListMethod.MakeGenericMethod(sourceType), assignExpression);
|
|
|
- Expression setIf = Expression.IfThen(checkIfNull, Expression.Assign(propToAssign, assignExpression));
|
|
|
- finalAssign.Add(setIf);
|
|
|
- finalAssign.Add(toListExp);
|
|
|
- }
|
|
|
- }
|
|
|
- }
|
|
|
- }
|
|
|
- else // 来自其他映射器。
|
|
|
- {
|
|
|
- var mapper = GetMapper(sourceType, targetType, false, item.Item4);
|
|
|
- if (mapper == null)
|
|
|
- {
|
|
|
- continue;
|
|
|
- }
|
|
|
-
|
|
|
- mapper.Initialize(_constructorFunc);
|
|
|
- Expression defaultExpression = Expression.Constant(MapperHelper.GetDefaultValue(item.Item2.Type), item.Item2.Type);
|
|
|
- if (!IsListOf(propToAssign.Type))
|
|
|
- {
|
|
|
- ChangParameterExpressionVisitor changeVisitor = new ChangParameterExpressionVisitor(propToAssign, assignExpression);
|
|
|
-
|
|
|
- Expression modifiedExpression = changeVisitor.Visit(mapper.expressionForExisting.Body);
|
|
|
- Expression checkIfNull = Expression.NotEqual(propToAssign, defaultExpression);
|
|
|
- Expression setIf = Expression.IfThen(checkIfNull, modifiedExpression);
|
|
|
- assignExpression = setIf;
|
|
|
- }
|
|
|
- else
|
|
|
- {
|
|
|
- Expression checkIfNull = Expression.NotEqual(propToAssign, defaultExpression);
|
|
|
- Expression setIf = Expression.IfThen(checkIfNull, Expression.Assign(propToAssign, assignExpression));
|
|
|
- assignExpression = setIf;
|
|
|
- }
|
|
|
-
|
|
|
- finalAssign.Add(assignExpression);
|
|
|
- }
|
|
|
- }
|
|
|
-
|
|
|
- if (finalAssign.Count > 0 && _delegateCallForExisting == null)
|
|
|
- {
|
|
|
- expressionForExisting = Expression.Lambda(Expression.Block(typeof(void), finalAssign), paramClassSource, paramTarget);
|
|
|
- // 编译
|
|
|
- _delegateCallForExisting = expressionForExisting.Compile();
|
|
|
- }
|
|
|
- }
|
|
|
-
|
|
|
- internal Expression GetLambdaDest(string propertyName)
|
|
|
- {
|
|
|
- var exp = PropertiesMapping.Find(x => GetPropertyInfo(x.Item1).Name == propertyName);
|
|
|
- if (exp != null)
|
|
|
- {
|
|
|
- var final = exp.Item2;
|
|
|
- if (final.NodeType == ExpressionType.Convert)
|
|
|
- {
|
|
|
- final = (final as UnaryExpression).Operand;
|
|
|
- }
|
|
|
-
|
|
|
- return final;
|
|
|
- }
|
|
|
-
|
|
|
- return null;
|
|
|
- }
|
|
|
-
|
|
|
- /// <summary>
|
|
|
- /// 创建映射表达式树
|
|
|
- /// </summary>
|
|
|
- /// <param name="constructor"></param>
|
|
|
- public virtual void CreateMappingExpression(Func<Type, object> constructor)
|
|
|
- {
|
|
|
- if (_isInitialized)
|
|
|
- {
|
|
|
- return;
|
|
|
- }
|
|
|
-
|
|
|
- // 它是在处理前放置以避免递归循环。
|
|
|
- _isInitialized = true;
|
|
|
- _constructorFunc = constructor;
|
|
|
- CreateCommonMember();
|
|
|
- var propsToAnalyse = PropertiesMapping.ToList(); // 克隆列表以便于更改。
|
|
|
- for (int i = 0; i < propsToAnalyse.Count; i++)
|
|
|
- {
|
|
|
- var propToAnalyse = propsToAnalyse[i];
|
|
|
- CheckAndConfigureMapping(ref propToAnalyse);
|
|
|
- propsToAnalyse[i] = propToAnalyse;
|
|
|
- }
|
|
|
-
|
|
|
- PropertiesMapping = propsToAnalyse;
|
|
|
- // 编译
|
|
|
- GetDelegate();
|
|
|
- }
|
|
|
-
|
|
|
- internal Type GetRealType(Type typeToFind)
|
|
|
- {
|
|
|
- return UseServiceLocator ? _constructorFunc(typeToFind).GetType() : typeToFind;
|
|
|
- }
|
|
|
-
|
|
|
- internal PropertiesNotMapped GetPropertiesNotMapped()
|
|
|
- {
|
|
|
- // 克隆属性信息
|
|
|
- var sourceProperties = SourceType.GetProperties().ToList();
|
|
|
- var targetProperties = TargetType.GetProperties().ToList();
|
|
|
-
|
|
|
- var visitor = new PropertiesVisitor(TargetType);
|
|
|
- foreach (var members in memberForNew)
|
|
|
- {
|
|
|
- var members1 = members;
|
|
|
- sourceProperties.RemoveAll((p) => members1.Member.Name == p.Name);
|
|
|
- targetProperties.RemoveAll((p) => visitor.GetProperties(members.Expression).Contains(p));
|
|
|
- }
|
|
|
-
|
|
|
- // 检查被忽略映射的成员
|
|
|
- sourceProperties.RemoveAll((p) => _propertiesToIgnore.Contains(p));
|
|
|
- return new PropertiesNotMapped
|
|
|
- {
|
|
|
- sourceProperties = sourceProperties,
|
|
|
- targetProperties = targetProperties
|
|
|
- };
|
|
|
- }
|
|
|
-
|
|
|
- /// <summary>
|
|
|
- /// 获取排序表达式树
|
|
|
- /// </summary>
|
|
|
- /// <param name="propertySource">属性名</param>
|
|
|
- /// <returns></returns>
|
|
|
- public LambdaExpression GetSortedExpression(string propertySource)
|
|
|
- {
|
|
|
- var exp = PropertiesMapping.Find(x => GetPropertyInfo(x.Item2).Name == propertySource);
|
|
|
- if (exp == null)
|
|
|
- {
|
|
|
- throw new PropertyNoExistException(propertySource, TargetType);
|
|
|
- }
|
|
|
-
|
|
|
- // 更改参数
|
|
|
- var visitor = new MapperExpressionVisitor(paramClassSource);
|
|
|
- var result = visitor.Visit(exp.Item1);
|
|
|
- return Expression.Lambda(result, paramClassSource);
|
|
|
- }
|
|
|
-
|
|
|
- private static bool IsListOf(Type typeTarget)
|
|
|
- {
|
|
|
- // 特殊情况字符串是char数组。
|
|
|
- if (typeTarget == typeof(string))
|
|
|
- {
|
|
|
- return false;
|
|
|
- }
|
|
|
-
|
|
|
- Func<Type, bool> test = t => t.IsAssignableFrom(typeof(IEnumerable));
|
|
|
- return test(typeTarget) || typeTarget.GetInterfaces().Any(test);
|
|
|
- }
|
|
|
-
|
|
|
- private MapperConfigurationBase GetAndCheckMapper(Type typeOfSource, Type typeOfTarget, string name)
|
|
|
- {
|
|
|
- var externalMapper = GetMapper(typeOfSource, typeOfTarget, false, name);
|
|
|
- if (externalMapper != null)
|
|
|
- {
|
|
|
- return externalMapper;
|
|
|
- }
|
|
|
-
|
|
|
- //如果找不到具有别名的映射器
|
|
|
- if (!string.IsNullOrEmpty(name))
|
|
|
- {
|
|
|
- throw new NoFoundMapperException(name);
|
|
|
- }
|
|
|
-
|
|
|
- throw new NotSameTypePropertyException(typeOfSource, typeOfTarget);
|
|
|
- }
|
|
|
-
|
|
|
- private void CreatBindingFromSimple(ref Tuple<Expression, Expression, bool, string> configExpression, Type typeSource, Type typeTarget, PropertyInfo propTarget)
|
|
|
- {
|
|
|
- // 没有特殊的操作
|
|
|
- if (typeSource == typeTarget)
|
|
|
- {
|
|
|
- // 创建成员绑定
|
|
|
- CreateMemberBinding(configExpression.Item1, propTarget, configExpression.Item3);
|
|
|
- }
|
|
|
- else
|
|
|
- {
|
|
|
- // 尝试查找mapper
|
|
|
- var externalMapper = GetAndCheckMapper(typeSource, typeTarget, configExpression.Item4);
|
|
|
- // 如果此时未初始化映射器
|
|
|
- externalMapper.CreateMappingExpression(_constructorFunc);
|
|
|
- // 默认情况下,检查对象的null
|
|
|
- Expression mapExpression = externalMapper.GetMemberInitExpression();
|
|
|
- Expression defaultExpression = Expression.Constant(MapperHelper.GetDefaultValue(configExpression.Item1.Type), configExpression.Item1.Type);
|
|
|
- // 修改成员
|
|
|
- var expSource = visitorMapper.Visit(configExpression.Item1);
|
|
|
- var changeParamaterVisitor = new ChangParameterExpressionVisitor(expSource);
|
|
|
- mapExpression = changeParamaterVisitor.Visit(mapExpression);
|
|
|
- // 现在可以创建正确的参数。
|
|
|
- Expression checkIfNull = Expression.NotEqual(expSource, defaultExpression);
|
|
|
- // 创建条件
|
|
|
- var checkExpression = Expression.Condition(checkIfNull, mapExpression, Expression.Constant(MapperHelper.GetDefaultValue(mapExpression.Type), mapExpression.Type), mapExpression.Type);
|
|
|
- var bindExpression = Expression.Bind(propTarget, checkExpression);
|
|
|
- // 找到了映射器但没有配置
|
|
|
- if (string.IsNullOrEmpty(configExpression.Item4))
|
|
|
- {
|
|
|
- configExpression = Tuple.Create(configExpression.Item1, configExpression.Item2, configExpression.Item3, externalMapper.Name);
|
|
|
- }
|
|
|
-
|
|
|
- memberForNew.Add(bindExpression);
|
|
|
- }
|
|
|
- }
|
|
|
-
|
|
|
- private void CreateBindingFromList(ref Tuple<Expression, Expression, bool, string> configExpression, Type typeSource, Type typeTarget, PropertyInfo propTarget)
|
|
|
- {
|
|
|
- var sourceTypeList = TypeSystem.GetElementType(typeSource);
|
|
|
- var destTypeList = TypeSystem.GetElementType(typeTarget);
|
|
|
- if (sourceTypeList == destTypeList)
|
|
|
- {
|
|
|
- if (configExpression.Item2.NodeType == ExpressionType.MemberAccess)
|
|
|
- {
|
|
|
- CreateMemberBinding(configExpression.Item1, propTarget, configExpression.Item3);
|
|
|
- }
|
|
|
- }
|
|
|
- // 使用Enumerable类的select方法来更改类型
|
|
|
- else
|
|
|
- {
|
|
|
- var externalMapper = GetAndCheckMapper(sourceTypeList, destTypeList, configExpression.Item4);
|
|
|
- externalMapper.CreateMappingExpression(_constructorFunc);
|
|
|
- MemberAssignment expBind;
|
|
|
- var expSource = configExpression.Item1;
|
|
|
- var visitor = new ChangParameterExpressionVisitor(paramClassSource);
|
|
|
- expSource = visitor.Visit(expSource);
|
|
|
-
|
|
|
- // 为了与EF / LINQ2SQL兼容。
|
|
|
- var expMappeur = externalMapper.GetGenericLambdaExpression();
|
|
|
- // 创建对Select方法的调用,在Enumerable的Select中插入一个lambda表达式(参数是一个委托),通常情况下,这是不可能的,但(个人认为)编译器就像这样创建并且LINQ2SQL / EF是可以进行sql查询的
|
|
|
- Expression select = Expression.Call(_selectMethod.MakeGenericMethod(sourceTypeList, destTypeList), new[]
|
|
|
- {
|
|
|
- expSource,
|
|
|
- expMappeur
|
|
|
- });
|
|
|
- // 创建对ToList方法的调用
|
|
|
- Expression toList = Expression.Call(_toListMethod.MakeGenericMethod(destTypeList), select);
|
|
|
-
|
|
|
- if (configExpression.Item3) // 如果要检查无效(使用EF / LinqTosql,则不需要)。
|
|
|
- {
|
|
|
- // 测试source的属性是否为null。
|
|
|
- Expression checkIfNull = Expression.NotEqual(expSource, Expression.Constant(MapperHelper.GetDefaultValue(expSource.Type), expSource.Type));
|
|
|
- // 有时候ToList方法不起作用,则使用实现ToList不起作用的类
|
|
|
- Expression asExp = Expression.TypeAs(toList, propTarget.PropertyType);
|
|
|
- // 创建条件表达式
|
|
|
- Expression expCondition = Expression.Condition(checkIfNull, asExp, Expression.Constant(MapperHelper.GetDefaultValue(typeTarget), typeTarget));
|
|
|
-
|
|
|
- // 分配给目标属性。
|
|
|
- expBind = Expression.Bind(propTarget, expCondition);
|
|
|
- }
|
|
|
- else
|
|
|
- {
|
|
|
- // 分配给目标属性。
|
|
|
- expBind = Expression.Bind(propTarget, toList);
|
|
|
- }
|
|
|
-
|
|
|
- // 查找mapper
|
|
|
- if (string.IsNullOrEmpty(configExpression.Item4))
|
|
|
- {
|
|
|
- configExpression = Tuple.Create(configExpression.Item1, configExpression.Item2, configExpression.Item3, externalMapper.Name);
|
|
|
- }
|
|
|
-
|
|
|
- memberForNew.Add(expBind);
|
|
|
- }
|
|
|
- }
|
|
|
- }
|
|
|
-}
|