Best way to check for null parameters (Guard Clauses)

Question

For example, you usually don\'t want parameters in a constructor to be null, so it\'s very normal to see some thing like

if (someArg == null)
{
    throw new Arg         


        

Answer 1

If you have too many parameters in your constructors, you'd better revise them, but that's another story.

To decrease boilerplate validation code many guys write Guard utility classes like this:

public static class Guard
{
    public static void ThrowIfNull(object argumentValue, string argumentName)
    {
        if (argumentValue == null)
        {
            throw new ArgumentNullException(argumentName);
        }
    }

    // other validation methods
}

(You can add other validation methods that might be necessary to that Guard class).

Thus it only takes one line of code to validate a parameter:

    private static void Foo(object obj)
    {
        Guard.ThrowIfNull(obj, "obj");
    }