/// <summary>
/// 异步写
/// </summary>
/// <param name="p_stream"></param>
/// <param name="p_buffer"></param>
/// <param name="p_offset"></param>
/// <param name="p_count"></param>
/// <param name="p_cancellationToken"></param>
/// <returns></returns>
public static Task WriteAsync(this Stream p_stream, byte[] p_buffer, int p_offset, int p_count, CancellationToken p_cancellationToken)
{
if (p_cancellationToken.IsCancellationRequested)
{
TaskCompletionSource <object> source = new TaskCompletionSource <object>();
source.SetCanceled();
return(source.Task);
}
TaskFactory factory = Task.Factory;
Stream stream2 = p_stream;
Stream stream3 = p_stream;
return(factory.FromAsync <byte[], int, int>(new System.Func <byte[], int, int, AsyncCallback, object, IAsyncResult>(stream2.BeginWrite), new Action <IAsyncResult>(stream3.EndWrite), p_buffer, p_offset, p_count, null));
}