reactive/Rx.NET/Source/System.Reactive.Core/Reactive/Disposables/Disposable.cs

// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the Apache 2.0 License.
// See the LICENSE file in the project root for more information. 

namespace System.Reactive.Disposables
{
    /// <summary>
    /// Provides a set of static methods for creating Disposables.
    /// </summary>
    public static class Disposable
    {
        /// <summary>
        /// Gets the disposable that does nothing when disposed.
        /// </summary>
        public static IDisposable Empty
        {
            get { return DefaultDisposable.Instance; }
        }

        /// <summary>
        /// Creates a disposable object that invokes the specified action when disposed.
        /// </summary>
        /// <param name="dispose">Action to run during the first call to <see cref="IDisposable.Dispose"/>. The action is guaranteed to be run at most once.</param>
        /// <returns>The disposable object that runs the given action upon disposal.</returns>
        /// <exception cref="ArgumentNullException"><paramref name="dispose"/> is null.</exception>
        public static IDisposable Create(Action dispose)
        {
            if (dispose == null)
                throw new ArgumentNullException("dispose");

            return new AnonymousDisposable(dispose);
        }
    }
}