started dragging API

src/Avalonia.Controls/DragDrop/DataObject.cs

@@ -0,0 +1,43 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace Avalonia.Controls.DragDrop
+{
+    public class DataObject : IDataObject
+    {
+        private readonly Dictionary<string, object> _items = new Dictionary<string, object>();
+
+        public bool Contains(string dataFormat)
+        {
+            return _items.ContainsKey(dataFormat);
+        }
+
+        public object Get(string dataFormat)
+        {
+            if (_items.ContainsKey(dataFormat))
+                return _items[dataFormat];
+            return null;
+        }
+
+        public IEnumerable<string> GetDataFormats()
+        {
+            return _items.Keys;
+        }
+
+        public IEnumerable<string> GetFileNames()
+        {
+            return Get(DataFormats.FileNames) as IEnumerable<string>;
+        }
+
+        public string GetText()
+        {
+            return Get(DataFormats.Text) as string;
+        }
+
+        public void Set(string dataFormat, object value)
+        {
+            _items[dataFormat] = value;
+        }
+    }
+}

src/Avalonia.Controls/DragDrop/DragDrop.cs

@@ -20,5 +20,15 @@ namespace Avalonia.Controls.DragDrop
         {
             interactive.SetValue(AcceptDragProperty, value);
         }
+
+        /// <summary>
+        /// Starts a dragging operation with the given <see cref="IDataObject"/> and returns the applied drop effect from the target.
+        /// <seealso cref="DataObject"/>
+        /// </summary>
+        public static DragDropEffects DoDragDrop(this Interactive source, IDataObject data, DragDropEffects allowedEffects)
+        {
+
+            return DragDropEffects.None;
+        }
     }
 }