Preconditions.NET 
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Introduction
Preconditions.NET provides convenience static methods to help check that a method or a constructor is invoked with proper parameter or not. In other words it checks the pre-conditions. The goal of this class is to improve readability of code.
Preconditions.NET returns the tested value on success, allowing to check and call a method at the same time.
On failure it always throws an ArgumentException, ArgumentNullException or ArgumentOutOfRangeException.
Why Preconditions.NET v2 ?
Preconditions.NET v2.0.0 is a complete rewrite that takes advantage of nullable types, the NotNull attribute and the new .NET 6 CallerArgumentExpression attribute.
It is no more mandatory to pass the parameter name being checked.
It also adds new methods (cf. checklist) and remove Check.Zero().
How to use it ?
Because Preconditions.NET is only one code file, you can either copy the Check.cs class or include the NuGet package to your project :
PM> Install-Package Preconditions.NET
Example
public class Employee : Person
{
public Employee(string name, string id) : base(Check.NotNullOrEmpty(name))
{
Id = Check.NullableButNotEmpty(id);
}
public string Id { get; }
}The checklist
- Check.NotNull(object)
- Check.NullableButNotEmpty (string)
- Check.NotNullOrEmpty(string)
- Check.NotNullOrEmpty(IEnumerable)
- Check.HasNoNulls(IEnumerable)
- Check.NotEmpty(Guid)
- Check.FileExists()
- Check.DirectoryExists()
- Check.Positive()
- Check.PositiveOrNull()
- Check.Negative()
- Check.NegativeOrNull()
- Check.NotNegative()
- Check.NotNegativeOrNull()
- Check.True(Func)
Feedback and issues
Feedback, improvements, ideas are welcomed. Feel free to create new issues at the issues section.