Microsoft.Bcl.Async 中是否有 ExceptionDispatchInfo 的类似物？

有没有类似的ExceptionDispatchInfo http://msdn.microsoft.com/en-us/library/system.runtime.exceptionservices.exceptiondispatchinfo%28v=vs.110%29.aspx in 微软Bcl.Async https://www.nuget.org/packages/Microsoft.Bcl.Async？我找不到类似的东西。

这个问题是由另一个问题 https://stackoverflow.com/q/20170527/2674222我的。当异常的父级task可用，我可以使用task.GetAwaiter().GetResult()按照@StephenCleary 的建议重新抛出。

当它不可用时我有什么选择？

这是执行ExceptionDispatchInfo 来自莫诺 https://github.com/mono/mono/blob/master/mcs/class/corlib/System.Runtime.ExceptionServices/ExceptionDispatchInfo.cs。据我测试，它似乎与 Microsoft .NET 4.0 兼容。

public sealed class ExceptionDispatchInfo
{
    readonly Exception _exception;
    readonly object _source;
    readonly string _stackTrace;

    const BindingFlags PrivateInstance = BindingFlags.Instance | BindingFlags.NonPublic;
    static readonly FieldInfo RemoteStackTrace = typeof(Exception).GetField("_remoteStackTraceString", PrivateInstance);
    static readonly FieldInfo Source = typeof(Exception).GetField("_source", PrivateInstance);
    static readonly MethodInfo InternalPreserveStackTrace = typeof(Exception).GetMethod("InternalPreserveStackTrace", PrivateInstance);

    private ExceptionDispatchInfo(Exception source)
    {
        _exception = source;
        _stackTrace = _exception.StackTrace + Environment.NewLine;
        _source = Source.GetValue(_exception);
    }

    public Exception SourceException { get { return _exception; } }

    public static ExceptionDispatchInfo Capture(Exception source)
    {
        if (source == null)
            throw new ArgumentNullException("source");

        return new ExceptionDispatchInfo(source);
    }

    public void Throw()
    {
        try
        {
            throw _exception;
        }
        catch
        {
            InternalPreserveStackTrace.Invoke(_exception, new object[0]);
            RemoteStackTrace.SetValue(_exception, _stackTrace);
            Source.SetValue(_exception, _source);
            throw;
        }
    }
}