C# by Example: Exceptions


using System;
class ExceptionExamples
{

Errors can be created with the throw keyword. C# comes with a number of included Error types, which are helpful for error readability. You shouldn't return the error object, but 'throw' it instead, and let C# handle the rest.


    float Divide(float a, float b)
    {
        if (b == 0)
        {
            throw new DivideByZeroException();
        }
        return a / b;
    }


    void GiveUp()
    {

It's considered bad practice to throw the base 'Exception' class, instead of a more specific error.


        throw new Exception("Throwing this doesn't tell anyone what went wrong.");

Instead of using Exception, you should create a new class derived from exception.


    }
    float GetInches(float feet)
    {
        if (feet < 0)
        {

ArgumentException is a common exception to throw when putting checks in your code.


            throw new ArgumentException("Negative distances are not allowed.");
        }
        return feet * 12;
    }
    void PlaceholderFunction()
    {

NotImplemented is a favorite of mine. I like to write placeholder function names while sketching out ideas for system architecture.


        throw new NotImplementedException("I haven't gotten around to writing this code yet.");
    }
}

Further:

Next example: Enums.