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Home » Tip Bank » .NET » C#
Language: .NET
Expertise: Intermediate
Sep 5, 2019

Check Whether an Input Argument Is Null in C#

Use this extension method in C# to check whether or not an input argument is null, and throw an error if necessary.

Extension method:

public static void CheckIfParameterIsValid(this T o, string parameter) where T : class
{
        if (o == null) 
{
throw new ArgumentNullException (parameter + " is null, please provide a valid value.");
}
}
//Usage
string firstName = null;
firstName. CheckIfParameterIsValid ("firstName "); 

 

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