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Saturday, February 15, 2014

Switch Statement Rules in c#.net




Here in this article, we will discuss what are the rules we need to follow while writing a switch case.

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The switch statement is very useful, but unfortunately, you can’t always use it when you may
like to. Any switch statement you write must follow to the following rules:

- You can use switch only on primitive data types, such as int or string. With any other
types (including float and double), you’ll have to use an if statement.

- The case labels must be constant expressions, such as 42 or “42”. If you need to calculate your case label values at run time, you must use an if statement.

- The case labels must be unique expressions. In other words, two case labels cannot have the same value.

- You can specify that you want to run the same statements for more than one value by
providing a list of case labels and no intervening statements, in which case the code for the final label in the list is executed for all cases in that list. However, if a label has one or more associated statements, execution cannot fall through to subsequent labels, and the compiler generates an error.

For example:

switch (xyz)
        {
            case hey:
            case bye:
                color = "Red";
                break;
            case Clubs:
                color = "Black";
            case Spades:
                color = "Black";
                break;
        }



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