// C# Eval Expression

// Doc: https://eval-expression.net/options

​

// @nuget: Z.Expressions.Eval

​

/*

## UseTypeBeforeDynamic

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The UseTypeBeforeDynamic option lets you get or set if, for some expression, the logic using the type should have priority over the resolution using dynamic. By default, the UseTypeBeforeDynamicvalue is `false`.

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In this example, we will register the `Type` program, which contains the member `ValueForTypeOrDynamic` and we will create an `ExpandoObject` which contains a member `Program.ValueForTypeOrDynamic`. In the first expression, the value returned will be the value from the expando, which is the default expected behavior. In the second expression, we will set our `UseTypeBeforeDynamic = true;` option, and this time, the value returned will be the one from our type as we tell our library to use the type before the expando when one is found.

​

See more: https://eval-expression.net/options

*/

​

using System;

using System.Dynamic;

using Z.Expressions;

​

public class Program

{

    public static void Main()

    {

        // Global Context: EvalManager.DefaultContext.UseTypeBeforeDynamic = true;

        var context = new EvalContext();

        context.UseCache = false;

        context.RegisterStaticMember(typeof(Program));

        dynamic expando = new ExpandoObject();

        expando.Program = new ExpandoObject();

        expando.Program.ValueForTypeOrDynamic = 99;

        var r1 = context.Execute("Program.ValueForTypeOrDynamic", expando); // return 99

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

        context.UseTypeBeforeDynamic = true;

        var r2 = context.Execute("ValueForTypeOrDynamic", expando); // return 13

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

    }

    public static int ValueForTypeOrDynamic = 13;

}