// C# Eval Expression

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

​

// @nuget: Z.Expressions.Eval

​

/*

## ForceCharAsString

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The ForceCharAsString option lets you get or set if a char such as `'z'` must be forced as a string as if you would have specified `"z"`. The library is smart enough to know that the expression `'zzz'` is a string (more than one char) but sometimes cannot know if `'z'` is a string or a char, in particular when a method exists with an overload for a `char` and a `string`. By default, the ForceCharAsString value is`false`.

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In this example, we will use a `MethodOverload` method with an overload for both `char` and `string` types. In this first execute resolution, we will see that the method resolution uses the right method by using the overload with the `char` type. In the second resolution, we will force the library by using our option to consider all `char` as a `string` instead and observe that the library now uses the method overload with the `string` type.

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

*/

​

using System;

using Z.Expressions;

​

public class Program

{

    public static void Main()

    {

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

        var context = new EvalContext();

        context.UseCache = false;

        context.RegisterStaticMethod(typeof(Program));

        var r1 = context.Execute("MethodOverload('z')"); // return "Method with char z"

        Console.WriteLine(r1);

        context.ForceCharAsString = true;

        var r2 = context.Execute("MethodOverload('z')"); // return "Method with string z"

        Console.WriteLine(r2);

    }

    public static string MethodOverload(char s)

    {

        return "Method with char " + s;

    }

    public static string MethodOverload(string s)

    {

        return "Method with string " + s;

    }

}