internal static TaskSequence ComputeMD5(this Stream stream, Action <string> setResult)
{
int readCount;
MD5 md5 = MD5.Create();
do
{
byte[] buffer = new byte[BufferSize];
var readTask = stream.ReadAsync(buffer, 0, buffer.Length);
yield return(readTask);
readCount = readTask.Result;
StreamUtilities.ComputeHash(buffer, 0, readCount, md5);
}while (readCount != 0);
setResult(StreamUtilities.GetHashValue(md5));
}