I'm creating a C# Socket Server, it already works, but now, when I press "Start" the "design" of the application doesn't load, it's not visible.
The socket server is running correcty (I see it working in the output window), I don't see any kind of error. I start deleting parts of the code, and the design stops being visible after this line:
TcpClient client = server.AcceptTcpClient();
...
If I remove from this line to the end, it appear again.
What's going on? (sorry for my bad english)
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
start();
}
private void start() {
TcpListener server = new TcpListener(IPAddress.Parse("127.0.0.1"), 1234);
server.Start();
TcpClient client = server.AcceptTcpClient();
Console.WriteLine("Client connected.");
}
I Think the problem is that the load is interrupted while the socket is working waiting for connections.
I'm trying to execute "start()" function on Form1_Shown but it does not work.
How can I be sure to start the socket server after the Form is full loaded?
server.AcceptTcpClient() is a blocking call and you are making it on the UI thread. You have a few options, here they are in the order I would do them.
Make the function you are calling it from async and use AcceptTcpClientAsync.
//Event handlers like `Load` are the only place you are allowed to do "async void"
private async void Form1_Load(object sender, EventArgs e)
{
await start();
}
private async Task start() {
TcpListener server = new TcpListener(IPAddress.Parse("127.0.0.1"), 1234);
server.Start();
TcpClient client = await server.AcceptTcpClientAsync();
Console.WriteLine("Client connected.");
}
If you can't use async/await because of the version of .NET you are targeting use BeginAcceptTcpClient to have a callback accept the client instead.
private void Form1_Load(object sender, EventArgs e)
{
start();
}
private void start() {
TcpListener server = new TcpListener(IPAddress.Parse("127.0.0.1"), 1234);
server.Start();
server.BeginAcceptTcpClient(AcceptClient, server);
}
private void AcceptClient(IAsyncResult result)
{
var server = (TcpListener)result.AsyncState;
TcpClient client = server.EndAcceptTcpClient(result);
Console.WriteLine("Client connected.");
}
Or one other option is put the code you currently have on a background thread via a Task.Run( or similar. However, I really would not recommend this approach, you tie up a thread just waiting for a new connection, the framework already provides better ways to do this without a thread by using async/await or the begin/end pair.
private void Form1_Load(object sender, EventArgs e)
{
Task.Run(() => start());
}
private void start() {
TcpListener server = new TcpListener(IPAddress.Parse("127.0.0.1"), 1234);
server.Start();
TcpClient client = server.AcceptTcpClient();
Console.WriteLine("Client connected.");
}