C＃，Catch异常

Question

I get a Exception type using

catch(Exception e){
  log.Error(e.GetType()); // it write 'System.Data.EntityException'
}

so I change my code to catch that exception,

try{
...
}catch(EntityException a){
  // need to do something
  log.Error("I got it!");
}catch(Exception e){
  log.Error("No");
}

and the code write only "No".

How can I catch the EntityException before reach Exception?

Thanks

Answer 1

The code you have should work correctly, provided there isn't another EntityException type defined within the current set of using statements for that file or namespace.

Try fully qualifying the type, as in the following:

try{
...
}catch(System.Data.EntityException a){
  // need to do something
  log.Error("I got it!");
}catch(Exception e){
  log.Error("No");
}

Answer 2

I was having the same problem, and the accepted answer here wasn't working for me. While EntityException is fully qualified as System.Data.EntityException, it's actually in the System.Data.Entity assembly (See http://msdn.microsoft.com/en-us/library/system.data.entityexception(v=vs.110).aspx ), so the project needs a reference to System.Data.Entity before Intellisense will recognize System.Data.EntityException in your code.

Answer 3

匹配异常的第一个“catch”是激活的那个。