AnyConstraint.Analyzer

A simple C# analyzer that suppresses the CS0702: "Constraint cannot be special class 'Delegate' / 'Enum' / '...' " error.

Installation

Simply install the NuGet package, and the analyzer will be automatically added to your project.

Install-Package AnyConstraint.Analyzer

Usage

There is no usage. Having the analyzer referenced is enough. The following code should compile just fine:

public static void Invoke<TDelegate>(TDelegate del) where TDelegate : Delegate { ... }
public static void GetValues<T>(T @enum) where T : Enum { ... }

Nonetheless, an error will be shown in Visual Studio. To hide it from the 'Error List' panel, you can add the following code above your method:

[SuppressMessage("Compiler", "CS0702")]

Or, at the global level:

[assembly: SuppressMessage("Compiler", "CS0702")]

How does it work?

Using Ryder, the internal call to Binder.IsValidConstraintType is replaced by a simple return true statement, thus allowing any type to be used as a constraint.