抛出WebException但从未被捕获 [英] WebException thrown but never gets caught

问题描述

我有以下代码：

try
{
    using (var myHttpWebResponse = (HttpWebResponse) httPrequestCreated.GetResponse())
    {
        var streamResponse = myHttpWebResponse.GetResponseStream();

        if (streamResponse != null)
        {
            var streamRead = new StreamReader(streamResponse);
            var readBuff = new Char[256];
            var count = streamRead.Read(readBuff, 0, 256);         

            while (count > 0)
            {
                var outputData = new String(readBuff, 0, count);
                finalResopnse += outputData;
                count = streamRead.Read(readBuff, 0, 256);
            }
            streamRead.Close();
            streamResponse.Close();
            myHttpWebResponse.Close();

        }
    }
}
catch (WebException ex)
{
    MessageBox.Show("something went wrong");
}

错误代码为 404 Not Found ，而不是MessageBox我收到以下错误：

The error code is 404 Not Found, but instead of a MessageBox I get the following error:

为什么没有捕获到异常？

Why is the exception never caught?

推荐答案

您可能在Visual Studio中有第一次机会异常捕获。

You probably have first chance exception catching turned on in Visual Studio.

尝试运行不带调试器的应用程序（Ctrl + F5）。或者，如果您收到此对话框，您可以按运行（F5）获取您的消息框。

Try running the application without debugger (Ctrl+F5). Or, if you get this dialog, you can press Run (F5) to get your message box.

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