How to get Exception Error Code in C

Question

try        object result   processClass InvokeMethod  Create   methodArgs     catch  Exception e             Here I was hoping to get an error code      When I invoke the above WMI method I am expected to get Access Denied  In my catch block I want to make sure that the exception raised was indeed for Access Denied  Is there a way I can get the error code for it   Win32 error code for Acceess Denied is 5  I dont want to search the error message for denied string or anything like that    Thanks

User · Answer

I suggest you to use Message Properte from The Exception Object Like below code   try    object result   processClass InvokeMethod  Create   methodArgs     catch  Exception e            use Console Write e Message   from Console Application        and use MessageBox Show e Message   from WindowsForm and WPF Application

User · Answer

You can use this to check the exception and the inner exception for a Win32Exception derived exception   catch  Exception e          var w32ex   e as Win32Exception      if w32ex    null            w32ex   e InnerException as Win32Exception                if w32ex    null            int code    w32ex ErrorCode             do stuff                  do other stuff        Starting with C  6  when can be used in a catch statement to specify a condition that must be true for the handler for a specific exception to execute   catch  Win32Exception ex  when  ex InnerException is Win32Exception        var w32ex    Win32Exception ex InnerException      var code    w32ex ErrorCode      As in the comments  you really need to see what exception is actually being thrown to understand what you can do  and in which case a specific catch is preferred over just catching Exception  Something like     catch  BlahBlahException ex               do stuff          Also System Exception has a HRESULT   catch  Exception ex           var code   ex HResult       However  it s only available from  NET 4 5 upwards

User · Answer

You should look at the members of the thrown exception  particularly  Message and  InnerException   I would also see whether or not the documentation for InvokeMethod tells you whether it throws some more specialized Exception class than Exception - such as the Win32Exception suggested by   Preet   Catching and just looking at the Exception base class may not be particularly useful

User · Answer

Building on Preet Sangha s solution  the following should safely cover the scenario where you re working with a large solution with the potential for several Inner Exceptions    try         object result   processClass InvokeMethod  Create   methodArgs       catch  Exception e             Here I was hoping to get an error code       if  ExceptionContainsErrorCode e  10004                      Execute desired actions                  private bool ExceptionContainsErrorCode Exception e  int ErrorCode        Win32Exception winEx   e as Win32Exception      if  winEx    null  amp  amp  ErrorCode    winEx ErrorCode           return true       if  e InnerException    null           return ExceptionContainsErrorCode e InnerException  ErrorCode        return false      This code has been unit tested   I won t harp too much on the need for coming to appreciate and implement good practice when it comes to Exception Handling by managing each expected Exception Type within their own blocks

User · Answer

Another method would be to get the error code from the exception class directly  For example   catch  Exception ex        if  ex InnerException is ServiceResponseException                   ServiceResponseException srex   ex InnerException as ServiceResponseException          string ErrorCode   srex ErrorCode ToString

[c#] How to get Exception Error Code in C#

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