你能赶上在C＃code本机的异常？ [英] Can you catch a native exception in C# code?

问题描述

在C＃code能赶上你从深一些非托管库抛出一个原生的异常？如果是这样你需要不同的方法来做任何事情来捕获它还是一个标准的尝试...赶上怎么做呢？

In C# code can you catch a native exception thrown from deep in some unmanaged library? If so do you need to do anything differently to catch it or does a standard try...catch get it?

推荐答案

您可以使用<一个href="http://msdn.microsoft.com/en-us/library/system.componentmodel.win32exception.aspx">Win32Exception并利用其NativeError code属性来妥善处理这个问题。

You can use Win32Exception and use its NativeErrorCode property to handle it appropriately.

// http://support.microsoft.com/kb/186550
const int ERROR_FILE_NOT_FOUND = 2;
const int ERROR_ACCESS_DENIED = 5;
const int ERROR_NO_APP_ASSOCIATED = 1155; 

void OpenFile(string filePath)
{
    Process process = new Process();

    try
    {
        // Calls native application registered for the file type
        // This may throw native exception
    	process.StartInfo.FileName = filePath;
    	process.StartInfo.Verb = "Open";
    	process.StartInfo.CreateNoWindow = true;
    	process.Start();
    }
    catch (Win32Exception e)
    {
    	if (e.NativeErrorCode == ERROR_FILE_NOT_FOUND || 
    		e.NativeErrorCode == ERROR_ACCESS_DENIED ||
    		e.NativeErrorCode == ERROR_NO_APP_ASSOCIATED)
    	{
    		MessageBox.Show(this, e.Message, "Error", 
    				MessageBoxButtons.OK, 
    				MessageBoxIcon.Exclamation);
    	}
    }
}

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