你可以在C＃代码中捕获本机异常吗？

问题描述

在C＃代码中，你可以捕获一些非托管库中抛出的本机异常吗？如果是这样，你需要做任何不同的事情来抓住它或做一个标准的尝试...抓住它？

解决方案

你可以使用，并使用其NativeErrorCode属性来处理它适当。

  // 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（）; 
 
尝试
 {
 //为文件类型
注册的本地应用程序调用//这可能会抛出本机异常
 process.StartInfo.FileName = filePath ; 
 process.StartInfo.Verb =打开; 
 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）; 
} 
} 
} 
  

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?

解决方案

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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