// C# Eval Expression

// Doc: https://eval-expression.net/register-unregister

​

// @nuget: Z.Expressions.Eval

​

/*

## RegisterExtensionMethod

​

The RegisterExtensionMethod method registers all extension methods from the types or method list provided.

​

In this example, we will register an extension method and use it. Then we will check if the extension method was registered with the `IsRegisteredExtensionMethod` method, unregister it with the method `UnregisterExtensionMethod` and verify that the method was correctly unregistered.

​

See more: https://eval-expression.net/register-unregister

*/

​

using System;

using Z.Expressions;

​

public class Program

{

    public static void Main()

    {

        // Global Context: EvalManager.DefaultContext.RegisterExtensionMethods(typeof(Extensions));

        var context = new EvalContext();

        context.RegisterExtensionMethod(typeof(Extensions));

        var r1 = context.Execute<int>("x.AddDemo(y)", new { x = 1, y = 2 });

        Console.WriteLine("1 - Result: " + r1);

        // Check if the extension methods is registered

        var r2 = context.IsRegisteredExtensionMethod(typeof(Extensions));

        Console.WriteLine("2 - Result: " + r2);

        // Unregister the extension methods

        context.UnregisterExtensionMethod(typeof(Extensions));

        // Check if the extension methods has been succesfully unregistered

        var r3 = context.IsRegisteredExtensionMethod(typeof(Extensions));

        Console.WriteLine("3 - Result: " + r3);

    }

}

​

public static class Extensions

{

    public static int AddDemo(this int x, int y)

    {

        return x + y;

    }

}