stephenclearyexamples/tcpchat

Basic asynchronous TCP/IP chat app

tcpchat's Issues

InvalidOperationException - No reading operation to complete

If I send 2 messages in a row from the client, the serer got an InvalidOperationException (No reading operation to complete).

Here is my clients Send-Click-Event Code that I have changed - see 2nd call to SendMessageAsync:

private async void Button_Click_1(object sender, RoutedEventArgs e)
{
	if (_chatConnection == null)
	{
		Log.Text += "No connection!\n";
	}
	else
	{
		await _chatConnection.SendMessageAsync(new ChatMessage(chatMessageTextBox.Text));
		// this is my additional SendMessageAsync call
		await _chatConnection.SendMessageAsync(new ChatMessage(chatMessageTextBox.Text));
		Log.Text += $"Sent message: {chatMessageTextBox.Text}\n";
	}
}

The server exception is raised in ProcessSocketMainLoop.

Any hints on this?

AcceptAsync inside/outside while loop

Hi Stephen,

Firstly, thank you for the Asynchronous TCP/IP videos, they have been really useful and contain lots of really useful background info.

In your file .../TcpChat/Chat/ChatServer/Program.cs you have AcceptAsync inside the while loop, eg

while (true)
{
    var connectedSocket = await listeningSocket.AcceptAsync();

    // Receive message.
    // ...
}

In Microsoft's docs create-a-socket-server AcceptAsync is before the while loop, eg

var handler = await listener.AcceptAsync();
while (true)
{
    // Receive message.
    // ...
}

I just wanted to know if there were valid reasons for doing one over the other? Does the Microsoft example only listen for and allow a single connection but your sample listens for multiple connections or are there other things to consider?

Many thanks,
R