Need an explanation on this code - c#
- by ltech
I am getting familiar with C# day by day and I came across this piece of code
public static void CopyStreamToStream(
Stream source, Stream destination,
Action<Stream,Stream,Exception> completed) {
byte[] buffer = new byte[0x1000];
AsyncOperation asyncOp = AsyncOperationManager.CreateOperation(null);
Action<Exception> done = e => {
if (completed != null) asyncOp.Post(delegate {
completed(source, destination, e); }, null);
};
AsyncCallback rc = null;
rc = readResult => {
try {
int read = source.EndRead(readResult);
if (read > 0) {
destination.BeginWrite(buffer, 0, read, writeResult => {
try {
destination.EndWrite(writeResult);
source.BeginRead(
buffer, 0, buffer.Length, rc, null);
}
catch (Exception exc) { done(exc); }
}, null);
}
else done(null);
}
catch (Exception exc) { done(exc); }
};
source.BeginRead(buffer, 0, buffer.Length, rc, null);
}
From this article
Article
What I fail to follow is that how does the delegate get notified that the copy is done? Say after the copy is done I want to perform an operation on the copied file.
