// C# Eval Expression

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

​

// @nuget: Z.Expressions.Eval

​

/*

## RegisterStaticField

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The RegisterStaticField method registers all static fields from the types or fields list provided.

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In this example, we will register all static fields of the type `Program` with the method `RegisterStaticField` and then use it in our expressions. Then we will demonstrate how to use the method `IsRegisteredStaticField` and `UnregisterStaticField` to check if all statics fields are currently registered and to unregister them.

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

*/

​

using System;

using Z.Expressions;

​

public class Program

{

    public static void Main()

    {

        // Global Context: EvalManager.DefaultContext.RegisterStaticField(typeof(Program));

        var context = new EvalContext();

        context.RegisterStaticField(typeof(Program));       

        var r1 = context.Execute<int>("MyStaticField + 100"); // return 101

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

        // Check if all static fields of the type `Program` is registered

        var r2 = context.IsRegisteredStaticField(typeof(Program)); // return true

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

        // Unregister all static fields of the type `Program`

        context.UnregisterStaticField(typeof(Program));

        // Check if all static fields of the type `Program` has been succesfully unregistered

        var r3 = context.IsRegisteredStaticField(typeof(Program)); // return false

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

    }

    public static int MyStaticField = 1;

}