C# Exceptions

[jimwawar]

I have defined a user Exception class. The exception will be thrown in

public int GetNextInt()
{
     return Int32.Parse(GetNextToken());
}

GetNextToken() reads a file stream, pulling characters until a predefined delimiters are met (space, end of line, etc) returning the string. I can not change anything in GetNextToken.

If GetNextToken does not return an int value I would like to throw my user defined exception. I have been unable to do so. As soon as as Int32.Parse() finds the input string is not an int it throws an exception.

Is there a way I can throw my user defined exception or use the data field in the predefined exception to add information.

Thanks

[Plater]

Try something like this:

public int GetNextInt()
{
   Int32 dummyval=0;
   bool valid=Int32.TryParse(GetNextToken(),out dummyval);
   if(!valid)
   {
      throw new MyCustomException();
   }
   return dummyval;
}

OR (maybe)

public int GetNextInt()
{
   try
   {
      return Int32.Parse(GetNextToken());
   }
   catch(Exception ee)
   {
      throw new MyCustomException();
   }
}

[jimwawar]

Try something like this:

public int GetNextInt()
{
   Int32 dummyval=0;
   bool valid=Int32.TryParse(GetNextToken(),out dummyval);
   if(!valid)
   {
      throw new MyCustomException();
   }
   return dummyval;
}

OR (maybe)

public int GetNextInt()
{
   try
   {
      return Int32.Parse(GetNextToken());
   }
   catch(Exception ee)
   {
      throw new MyCustomException();
   }
}

Now I am embarrassed, missed the TryParse completely. Works great, thanks for the reply.

[r035198x]

I have defined a user Exception class. The exception will be thrown in

public int GetNextInt()
{
     return Int32.Parse(GetNextToken());
}

GetNextToken() reads a file stream, pulling characters until a predefined delimiters are met (space, end of line, etc) returning the string. I can not change anything in GetNextToken.

If GetNextToken does not return an int value I would like to throw my user defined exception. I have been unable to do so. As soon as as Int32.Parse() finds the input string is not an int it throws an exception.

Is there a way I can throw my user defined exception or use the data field in the predefined exception to add information.

Thanks

You can also catch whatever exception is being thrown and rethrow your exception in the catch block but (in this case) that is dirtier.