.NET 6 - The ArgumentNullException helper class

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• .NET Conf 2021 - Sessions, slides and demos are online
• C# 10–Change an existing project to file scoped namespaces
• .NET 6 - The ArgumentNullException helper class

.NET 6 introduces a new helper class that uses the new [CallerArgumentExpression] attribute and the [DoesNotReturn] attribute; the ArgumentNullException helper class.

This class gives you an easy-to-use helper class that throws an ArgumentNullException for null values.

Thanks to the [CallerArgumentExpression] attribute this helper method gives you better error messages as it can capture the expressions passed to a method.

This is the implementation of this helper class:

	public class ArgumentNullException
	{
	public static void ThrowIfNull([NotNull] object? argument, [CallerArgumentExpression("argument")] string? paramName = null)
	{
	if (argument is null)
	{
	Throw(paramName);
	}
	}
	[DoesNotReturn]
	private static void Throw(string? paramName) =>
	throw new ArgumentNullException(paramName);
	}

view raw ArgumentNullException.cs hosted with ❤ by GitHub

Before C# 10, you probably would have used the nameof keyword and implemented this helper class like this:

	public class ArgumentNullException
	{
	public static void ThrowIfNull([NotNull] object? argument)
	{
	if (argument is null)
	{
	throw new ArgumentNullException(nameof(argument));
	}
	}
	}

view raw ArgumentNullException.cs hosted with ❤ by GitHub