// C# Eval Expression

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

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// @nuget: Z.Expressions.Eval

​

/*

## UseEqualsAssignmentAsEqualsOperator

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The UseEqualsAssignmentAsEqualsOperator option lets you get or set if the equal assignation `=` should instead act like an equal operator. For example, you evaluate some math formula and would want the expression `2+2=4` instead of trying to make a variable assignment. By default, the UseEqualsAssignmentAsEqualsOperator value is `false`.

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In this example, we will use the expression `x = 3` in both cases. In the first `Execute`, the equal operator will be used as an assignment which is the default behavior. In the second `Execute`, we will set the `UseEqualsAssignmentAsEqualsOperator = true;` option and see that the `=` operator behaves like the `==`.

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

*/

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using System;

using System.Collections.Generic;

using System.Reflection;

using Z.Expressions;

​

public class Program

{

    public static void Main()

    {

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

        var context = new EvalContext();

        context.UseCache = false;

        var dict = new Dictionary<string, object>();

        dict["x"] = 1;

        var r1 = context.Execute<int>("x = 3", dict); // return 3

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

        dict["x"] = 1;

        context.UseEqualsAssignmentAsEqualsOperator = true;

        var r2 = context.Execute<bool>("x = 3", dict); // return false

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

    }

}