捕获异步操作异常不起作用

Question

我有来自

的TCP客户端

System.Net.Sockets

public async void startTCP()
{
    await client.ConnectAsync(IPAddress, port);
    stream = client.GetStream();
}

我用 try catch 块包围它但是当我运行代码和这个异常被引发并且 VS 显示我在

UnhandledException += (sender, e) =>
{
    if (global::System.Diagnostics.Debugger.IsAttached) 
        global::System.Diagnostics.Debugger.Break();
};

在App.g.i.cs 不是我想去的地方 => 自己处理异常

System.Net.Internals.SocketExceptionFactory+ExtendedSocketException: The requested address is not valid in its context 255.255.255.255:25565 at System.Net.Sockets.Socket.EndConnect(IAsyncResult asyncResult) at System.Net.Sockets.TcpClient.EndConnect(IAsyncResult asyncResult) at System.Net.Sockets.TcpClient.<>c.b__21_1(IAsyncResult asyncResult) at System.Threading.Tasks.TaskFactory1.FromAsyncCoreLogic(IAsyncResult iar, Func2 endFunction, Action1 endAction, Task1 promise, Boolean requiresSynchronization) --- End of stack trace from previous location where exception was thrown --- at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at System.Runtime.CompilerServices.TaskAwaiter.GetResult() at PersonDesk.Socket.d__10.MoveNext() --- End of stack trace from previous location where exception was thrown --- at System.Runtime.CompilerServices.AsyncMethodBuilderCore.<>c.b__6_0(Object state) at System.Threading.WinRTSynchronizationContext.Invoker.InvokeCore()}

IP 地址只是要引发异常的占位符

Answer 1

public async void startTCP()

是一个 async void。你不应该那样做。因为

I surround it with try catch block

这是对 async void 不起作用的一件事。

要获得完整答案，您必须说明如何调用 startTCP()。涉及完整的调用链。

它似乎是关于 WPF 的，所以从事件处理程序开始（可以是一个异步无效）。

捕获异步操作异常不起作用

Catching async operation exception is not working

c#

network-programming

exception-handling

async-await

uwp

我有来自