blambert/codesnip – string extension method for validating that a string parameter is not null or empty.


I love extension methods.  Here’s a simple little string extension method:

/// <summary>
/// Validates that the input string is not null or empty.  If the input
/// string is null, ArgumentNullException will be thrown.  If the input
/// string is empty, ArgumentException will be thrown.
/// </summary>
/// <param name="value">The input string to validate.</param>
/// <param name="paramName">The name of the parameter being validated.</param>
private static void ValidateIsNotNullOrEmpty(this string value, string paramName)
{
    if (value == null)
    {
        throw new ArgumentNullException(paramName);
    }

    if (value.Length == 0)
    {
        throw new ArgumentException("cannot be empty", paramName);
    }
}

to validate string arguments.

Call it like:

public void SomeRoutine(string someStringParameter)
{
    someStringParameter.ValidateIsNotNullOrEmpty("someStringParameter");
}

Brian

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