我能赶上过程中C＃应用程序负载缺少DLL的错误？ [英] Can I catch a missing dll error during application load in C#?

问题描述

是否有可能捕获异常时引用的.dll文件找不到？

例如，我有一个第三方DLL的引用的C＃项目;如果DLL无法找到，则抛出异常。唯一的例外是System.IO.FileNotFoundException，但我无法确定要抓住它。下面的代码似乎没有工作：

 静态类节目
 {
 ///<总结> 
 ///的主入口点应用程序。 
 ///< /总结> 
 [STAThread] 
静态无效的主要（）
 {
试
 {
 //代码放在这里
} 
抓（例外EXC）
 {
 MessageBox.Show（exc.ToString（））; 
} 
} 
} 
  

解决方案

扩展Josh的答案。

集加载由CLR需求。典型地装配载荷将不会尝试，直到方法JIT'd其使用从该组件的类型。

如果您不能赶上与主方法的try / catch块大会加载失败，很可能beceause你用从内部装配型try / catch语句。因此，主要方法是实际运行之前发生异常。

尝试把所有的代码从主方法不同的功能。然后调用try / catch块内的功能，你应该看到的例外。

Is it possible to catch the exception when a referenced .dll cannot be found?

For example, I have a C# project with a reference to a third-party dll; if that dll cannot be found, an exception is thrown. The exception is a System.IO.FileNotFoundException, but I am unable to determine where to catch it. The following code did not seem to work:

static class Program
{
    /// <summary>
    /// The main entry point for the application.
    /// </summary>
    [STAThread]
    static void Main()
    {
        try
        {
          // code goes here
        }
        catch (Exception exc)
        {
            MessageBox.Show(exc.ToString());
        }
    }
}

解决方案

Extending Josh's answer.

Assemblies in .Net are loaded on demand by the CLR. Typically an assembly load won't be attempted until a method is JIT'd which uses a type from that assembly.

If you can't catch the assembly load failure with a try/catch block in the main method, it's likely beceause you're using a type from the assembly within the try/catch. So the exception occurs before the main method is actually run.

Try putting all of the code from the main method in a different function. Then call that function within the try/catch block and you should see the exception.

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