A simple package with guard clause extensions.
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NuGet: Ardalis.GuardClauses

Guard Clauses

A simple package with guard clause extensions.

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If you like or are using this project to learn or start your solution, please give it a star. Thanks!


    public void ProcessOrder(Order order)
    	Guard.Against.Null(order, nameof(order));

        // process order here

Supported Guard Clauses

  • Guard.Against.Null (throws if input is null)
  • Guard.Against.NullOrEmpty (throws if string input is null or empty)
  • Guard.Against.NullOrWhiteSpace (throws if string input is null, empty or whitespace)
  • Guard.Against.OutOfRange (throws if integer/DateTime input is outside a provided range)
  • Guard.Against.OutOfSQLDateRange (throws if DateTime input is outside the valid range of SQL Server DateTime values)

Extending with your own Guard Clauses

To extend your own guards, you can do the following:

    // Using the same namespace will make sure your code picks up your 
    // extensions no matter where they are in your codebase.
    namespace Ardalis.GuardClauses
        public static class FooGuard
            public static void Foo(this IGuardClause guardClause, string input, string parameterName)
                if (input?.ToLower() == "foo")
                    throw new ArgumentException("Should not have been foo!", parameterName);

    // Usage
    public void SomeMethod(string something)
        Guard.Against.Foo(something, nameof(something));