private async Task <PPError> SetLengthAsyncCore(long length, MessageLoop messageLoop = null)
{
var tcs = new TaskCompletionSource <PPError>();
EventHandler <PPError> handler = (s, e) => { tcs.TrySetResult(e); };
try
{
HandleSetLength += handler;
if (MessageLoop == null && messageLoop == null)
{
SetLength(length);
}
else
{
Action <PPError> action = new Action <PPError>((e) =>
{
var result = (PPError)PPBFileIO.SetLength(this, length,
new BlockUntilComplete()
);
tcs.TrySetResult(result);
}
);
InvokeHelper(action, messageLoop);
}
return(await tcs.Task);
}
catch (Exception exc)
{
Console.WriteLine(exc.Message);
tcs.SetException(exc);
return(PPError.Aborted);
}
finally
{
HandleSetLength -= handler;
}
}
/// <summary> /// SetLength() sets the length of the file. If the file size is extended, /// then the extended area of the file is zero-filled. The FileIO object must /// have been opened with write access. /// </summary> /// <param name="length">The length of the file to be set.</param> /// <returns></returns> public PPError SetLength(long length) => (PPError)PPBFileIO.SetLength(this, length, new CompletionCallback(OnSetLength));
