public static System.Threading.Tasks.Task <System.IO.Stream> GetRequestStreamAsync(this System.Net.WebRequest wr)
{
if (wr.ContentLength < 0)
{
throw new InvalidOperationException("The ContentLength property of the WebRequest must first be set to the length of the content to be written to the stream.");
}
var tcs = new System.Threading.Tasks.TaskCompletionSource <System.IO.Stream>();
wr.BeginGetRequestStream((result) =>
{
var source = (System.Net.WebRequest)result.AsyncState;
tcs.TrySetResult(source.EndGetRequestStream(result));
}, wr);
return(tcs.Task);
}
public static Task <System.IO.Stream> GetRequestStreamAsync(this System.Net.WebRequest request)
{
return(Task.Factory.FromAsync(request.BeginGetRequestStream(null, null), ia => request.EndGetRequestStream(ia)));
}
