Bajonczak.Guard 1.0.1

.NET Standard 2.0 .NET Framework 4.0
dotnet add package Bajonczak.Guard --version 1.0.1
NuGet\Install-Package Bajonczak.Guard -Version 1.0.1
This command is intended to be used within the Package Manager Console in Visual Studio, as it uses the NuGet module's version of Install-Package.
<PackageReference Include="Bajonczak.Guard" Version="1.0.1" />
For projects that support PackageReference, copy this XML node into the project file to reference the package.
paket add Bajonczak.Guard --version 1.0.1
#r "nuget: Bajonczak.Guard, 1.0.1"
#r directive can be used in F# Interactive, C# scripting and .NET Interactive. Copy this into the interactive tool or source code of the script to reference the package.
// Install Bajonczak.Guard as a Cake Addin
#addin nuget:?package=Bajonczak.Guard&version=1.0.1

// Install Bajonczak.Guard as a Cake Tool
#tool nuget:?package=Bajonczak.Guard&version=1.0.1

Guard Clauses

A simple extensible package with guard clause extensions.

A guard clause is a software pattern that simplifies complex functions by "failing fast", checking for invalid inputs up front and immediately failing if any are found.

Give a Star! ⭐

If you like or are using this project please give it a star. Thanks!


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

    // process order here

// OR

public class Order
    private string _name;
    private int _quantity;
    private long _max;
    private decimal _unitPrice;
    private DateTime _dateCreated;

    public Order(string name, int quantity, long max, decimal unitPrice, DateTime dateCreated)
        _name = Guard.Against.NullOrWhiteSpace(name, nameof(name));
        _quantity = Guard.Against.NegativeOrZero(quantity, nameof(quantity));
        _max = Guard.Against.Zero(max, nameof(max));
        _unitPrice = Guard.Against.Negative(unitPrice, nameof(unitPrice));
        _dateCreated = Guard.Against.OutOfSQLDateRange(dateCreated, nameof(dateCreated));

Supported Guard Clauses

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

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 Bajonczak.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));
Product Versions
.NET net5.0 net5.0-windows net6.0 net6.0-android net6.0-ios net6.0-maccatalyst net6.0-macos net6.0-tvos net6.0-windows net7.0 net7.0-android net7.0-ios net7.0-maccatalyst net7.0-macos net7.0-tvos net7.0-windows
.NET Core netcoreapp2.0 netcoreapp2.1 netcoreapp2.2 netcoreapp3.0 netcoreapp3.1
.NET Standard netstandard2.0 netstandard2.1
.NET Framework net40 net403 net45 net451 net452 net46 net461 net462 net463 net47 net471 net472 net48 net481
MonoAndroid monoandroid
MonoMac monomac
MonoTouch monotouch
Tizen tizen40 tizen60
Xamarin.iOS xamarinios
Xamarin.Mac xamarinmac
Xamarin.TVOS xamarintvos
Xamarin.WatchOS xamarinwatchos
Compatible target framework(s)
Additional computed target framework(s)
Learn more about Target Frameworks and .NET Standard.
  • .NETFramework 4.0

    • No dependencies.
  • .NETStandard 2.0

    • No dependencies.

NuGet packages

This package is not used by any NuGet packages.

GitHub repositories

This package is not used by any popular GitHub repositories.

Version Downloads Last updated
1.0.1 725 10/25/2021

Added a new guard for NotFound; added support for optional custom error messages