为什么try-catch块不能处理异常？ [英] Why try-catch block cannot handle the exception?

问题描述

FSDKCam.GetVideoFormatList 是外部.NET DLL的一种方法。当你看到图像时，它会在try-catch块中抛出异常。

  try 
 {
 FSDKCam.GetVideoFormatList（ref cameraList [0]，out formatList，out count）; 
 if（count> 0）cmbCameraList.Items.Add（cam）; 
} 
 catch {} 
  

截图：

请参阅 legacyCorruptedStateExceptionsPolicy 配置元素。他们这样做是因为人们在他们的代码中有 try {} catch（Exception）{} ，通常不是一个好主意来捕捉 AccessViolationException （以及其他几个）并继续。

另外，请参阅 http://msdn.microsoft.com/en-us/magazine/dd419661.aspx

FSDKCam.GetVideoFormatList is a method from external .NET dll. As you see the image, it throws an exception in try-catch block.

try
{
    FSDKCam.GetVideoFormatList(ref cameraList[0], out formatList, out count);
    if (count > 0) cmbCameraList.Items.Add(cam);
}
catch { }

Screenshot:

解决方案

In .NET 4, AccessViolationException is not catchable by default.

See the legacyCorruptedStateExceptionsPolicy configuration element. They did this because people have try {} catch (Exception) {} throughout their code and it is usually not a good idea to catch AccessViolationException (along with a few others) and continue.

Additionally, see http://msdn.microsoft.com/en-us/magazine/dd419661.aspx

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