// C# Eval Expression

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

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// @nuget: Z.Expressions.Eval

​

/*

## UseLocalCache

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The UseLocalCache option lets you get or set if the global cache (for all eval context) or a local cache (for this eval context) should be used when we retrieve or cache the delegate created from the compile method. By default, the UseLocalCache value is `false`.

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In this example, we will evaluate a simple expression from the global context and then again by using the `DisableAutoReplaceDictionaryKey = true` option. You can comment or uncomment the line `context.UseLocalCache = true;` to see a different result will be returned depending if we take the previously created delegate from the global cache or not.

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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;

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public class Program

{

    public static void Main()

    {

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

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        var context = new EvalContext();

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

        dict.Add("2", 12);

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        var r1 = Eval.Execute<int>("1 + 2", dict); // return 13 (1 + 12)

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

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        context.DisableAutoReplaceDictionaryKey = true;

        // comment or uncomment to see the different behavior

        context.UseLocalCache = true;

​

        var r2 = context.Execute<int>("1 + 2", dict); // return 3 if `UseLocalCache = true`; 13 if `UseLocalCache = false`; 

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

    }

}