ThrowHelperExtensions

Use ThrowHelper methods (ex. ArgumentException.ThrowIfNull) on your elderly .NET project

Usage

1. Set LangVersion to C# 14

This package uses Extension members feature on C# 14.

Please Add below on your .csproj or Directory.Build.props.

<PropertyGroup> <LangVersion>14</LangVersion> </PropertyGroup>

2. Add Package

dotnet add package Nogic.ThrowHelperExtensions

3. Use throw helpers

namespace Samples; public class Sample { public string Value1 { get; } public Sample(string value1) { // On .NET 6.0 or higher, it calls `ArgumentNullException.ThrowIfNull` directly. // On others, it calls `System.ExceptionPolyfills.ThrowIfNull` polyfill via extension members. ArgumentNullException.ThrowIfNull(value1); this.Value1 = value1; } }

API

• ArgumentException.ThrowIfNullOrEmpty(string?, string?)
• ArgumentException.ThrowIfNullOrWhiteSpace(string?, string?)
• ArgumentNullException.ThrowIfNull(object?, string?)
• ArgumentNullException.ThrowIfNull(void*, string?)
  • Set AllowUnsafeBlocks to true in your project file to use this overload.
• ObjectDisposedException.ThrowIf(bool, object)
• ObjectDisposedException.ThrowIf(bool, Type)
• ArgumentOutOfRangeException.ThrowIfEqual<T>(T, T, string?)
• ArgumentOutOfRangeException.ThrowIfGreaterThan<T>(T, T, string?) where T : IComparable<T>
• ArgumentOutOfRangeException.ThrowIfGreaterThanOrEqual<T>(T, T, string?) where T : IComparable<T>
• ArgumentOutOfRangeException.ThrowIfLessThan<T>(T, T, string?) where T : IComparable<T>
• ArgumentOutOfRangeException.ThrowIfLessThanOrEqual<T>(T, T, string?) where T : IComparable<T>
• ArgumentOutOfRangeException.ThrowIfNegative<T>(T, string?) where T : INumberBase<T> ¹
• ArgumentOutOfRangeException.ThrowIfNegativeOrZero<T>(T, string?) where T : INumberBase<T> ¹
• ArgumentOutOfRangeException.ThrowIfNotEqual<T>(T, T, string?)
• ArgumentOutOfRangeException.ThrowIfZero<T>(T, string?) where T : INumberBase<T> ¹

Limitations

• Except for ArgumentNullException.ThrowIfNull, exception messages are not localized.
• Unlike .NET 8.0 and 9.0, these methods do not have IEquatable<T> constraint on type parameter T. (based on .NET 10.0+ source code)
  • ArgumentOutOfRangeException.ThrowIfEqual<T>(T, T, string?)
  • ArgumentOutOfRangeException.ThrowIfNotEqual<T>(T, T, string?)
• The generated class System.ExceptionPolyfills is internal.

Options

ThrowHelperExtensionsGenerateAttributes

By default, this generator will generate necessary attribute types. (ex. DoesNotReturnAttribute) If you want to disable attribute generation (for example, use other generator like PolySharp), you can set the following MSBuild property in your project file:

<Project Sdk="Microsoft.NET.Sdk"> <PropertyGroup> <ThrowHelperExtensionsGenerateAttributes>false</ThrowHelperExtensionsGenerateAttributes> </PropertyGroup> </Project>

Footnotes

1. INumberBase<T> is not available in .NET 6.0 or below (including .NET Standard 2.0). So, this method only has overloads for the built-in numeric types. (byte, sbyte, short, ushort, int, uint, long, ulong, float, double, decimal, nint, nuint, char) ↩ ↩² ↩³