[英]Cant catch unhandled exception message in c# WPF
I Use the AppDomain.UnhandledException Event to catch unhandled exceptions. 我使用AppDomain.UnhandledException事件捕获未处理的异常。 I use a
MessageBox.Show()
instead of Console.WriteLine
in the example; 在示例中,我使用
MessageBox.Show()
代替Console.WriteLine
。
public static void Main()
{
AppDomain currentDomain = AppDomain.CurrentDomain;
currentDomain.UnhandledException += new UnhandledExceptionEventHandler(MyHandler);
try
{
throw new Exception("1");
}
catch (Exception e)
{
MessageBox.Show("Catch clause caught : " + e.Message);
}
throw new Exception("2");
}
static void MyHandler(object sender, UnhandledExceptionEventArgs args)
{
Exception e = (Exception) args.ExceptionObject;
MessageBox.Show("MyHandler caught : " + e.Message);
}
The example says the output should be: 该示例表示输出应为:
// The example displays the following output:
// Catch clause caught : 1
//
// MyHandler caught : 2
Instead my ex.Message
in the UnhandledExceptionEventHandler
returns this: 相反,我在
UnhandledExceptionEventHandler
ex.Message
返回以下内容:
MyHandler caught : 'The invocation of the constructor on type 'FlashMaps.MainWindow' that matches the specified binding constraints threw an exception.' Line number '4' and line position '9'.
When I expected it to return what the example displays: 当我期望它返回示例显示的内容时:
MyHandler caught : 2
Thank you for your help. 谢谢您的帮助。
In WPF, if exceptions occur when UIElements (including windows) are being instantiated via XAML, the framework's XAML/BAML engine creates an exception of its own and puts the original exception into its InnerException property. 在WPF中,如果在通过XAML实例化UIElements (包括Windows)时发生异常,则框架的XAML / BAML引擎将创建其自身的异常,并将原始异常放入其InnerException属性中。
Thus, to get full exception information, you can do something similar to the following in your exception handler(s): 因此,要获取完整的异常信息,您可以在异常处理程序中执行类似于以下操作:
try
{
...
}
catch (Exception ex)
{
string message = "";
string formatString = "{0}: {1}";
do
{
message += string.Format(formatString, ex.GetType(), ex.Message);
ex = ex.InnerException;
formatString = "\n Inner {0}: {1}";
}
while (ex != null);
MessageBox.Show(message);
}
The example given here in the form of a catch-block can be applied in the same manner to your UnhandledExceptionEventHandler . 此处以catch块形式给出的示例可以以相同的方式应用于UnhandledExceptionEventHandler 。
Your code is not running in full trust. 您的代码未完全信任运行。 Add the permissions on the method
在方法上添加权限
[SecurityPermission(SecurityAction.Demand, Flags = SecurityPermissionFlag.ControlAppDomain)]
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