Exceptions

[Jim Warburton]

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

this thing looks like it was written by an epileptic ferret Dave Kreskowiak

[Giorgi Dalakishvili]

If I were you, I would use Int.TryParse to check if the input string represents a number

#region signature my articles #endregion

[Judah Gabriel Himango]

public int GetNextInt()
{
    int parsedValue;
    bool success = int.TryParse(GetNextToken(), out parsedValue);
    if(!success)
    {
        throw MySuperSpecialException(...);
    }

return parsedValue;
}

Tech, life, family, faith: Give me a visit. I'm currently blogging about: Forgive Me Father, For I Have Sinned: A Catholic Confession Regarding Sabbath The apostle Paul, modernly speaking: Epistles of Paul Judah Himango

[codemunch]

public static bool TryParse(string s, out int result); Int32 myint; if(!Int32.TryParse(",", out myint)) throw new YourCustomException(); return myint;

[Jim Warburton]

The answer is to use Int32.TryParse():doh:. Modified Thanks to all for your answers.

this thing looks like it was written by an epileptic ferret Dave Kreskowiak

[Anthony Mushrow]

A SUPER special exception? Must be some important error to get that kind of treatment.

My current favourite word is: PIE! Good ol' pie, it's been a while.

[codemunch]

The original OP wanted to throw their own custom exception...Personally, I prefer to call them all "ABone" and let future maintenance developers sort it out :D EDIT: Or even "AFrikinBone" if you like sharks with lasers...

[PIEBALDconsult]

If you need to know what the actual exception was...

public int GetNextInt()
{
try
{
return System.Int32.Parse(GetNextToken());
}
catch ( System.Exception err )
{
throw new MyException ( "blah blah blah" , err ) ;
}
}