private bool OnProgress(StreamCopyProgressEventArgs e)
{
EventHandler <StreamCopyProgressEventArgs> handler = this.Progress;
if (handler != null)
{
handler(this, e);
return(true);
}
return(false);
}
public void Start()
{
lock (this._SYNC)
{
this.IsCancelling = false;
this.Failed = false;
this.Canceled = false;
this.Errors = null;
List <Exception> occuredExceptions = new List <Exception>();
try
{
this.IsRunning = true;
this.RaiseEventHandler(this.Started);
this.OnProgress(new StreamCopyProgressEventArgs(this._COPIER,
0, 0));
byte[] buffer = new byte[this._COPIER._BUFFER_SIZE];
long totalCopied = 0;
while (true)
{
int bytesRead = 0;
try
{
bytesRead = this._COPIER.Source.Read(buffer, 0, buffer.Length);
if (bytesRead < 1)
{
break;
}
if (this.IsCancelling)
{
break;
}
StreamCopyBeforeWriteEventArgs bwe = new StreamCopyBeforeWriteEventArgs(CollectionHelper.Take(buffer, bytesRead),
this._COPIER,
totalCopied);
this.OnBeforeWrite(bwe);
if (bwe.Cancel)
{
this.IsCancelling = true;
break;
}
if (bwe.Skip)
{
// skip write operation
continue;
}
int bytesCopied = 0;
byte[] dataToWrite = CollectionHelper.AsArray(bwe.Data);
if (dataToWrite != null)
{
if (dataToWrite.Length > 0)
{
bytesCopied = dataToWrite.Length;
this._COPIER.Destination.Write(dataToWrite, 0, bytesCopied);
totalCopied += bytesCopied;
}
}
StreamCopyProgressEventArgs e = new StreamCopyProgressEventArgs(this._COPIER,
bytesCopied, totalCopied);
this.OnProgress(e);
if (e.Cancel)
{
this.IsCancelling = true;
break;
}
}
catch (Exception ex)
{
StreamCopyProgressErrorEventArgs e = new StreamCopyProgressErrorEventArgs(ex,
this._COPIER,
bytesRead, totalCopied);
e.Cancel = true;
e.LogErrors = true;
this.OnProgressError(e);
if (e.LogErrors)
{
occuredExceptions.Add(e.Errors);
}
if (e.Handled == false)
{
// (re-)throw
throw e.Errors;
}
if (e.Cancel)
{
this.IsCancelling = true;
break;
}
}
}
}
catch (Exception ex)
{
occuredExceptions.Add(ex);
this.Failed = true;
}
finally
{
this.Errors = new ReadOnlyCollection <Exception>(occuredExceptions);
if (this.IsCancelling)
{
this.Canceled = true;
}
this.IsCancelling = false;
this.IsRunning = false;
this.RaiseEventHandler(this.Completed);
}
}
}