// C# Eval Expression

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

​

// @nuget: Z.Expressions.Eval

​

/*

## MaxLoopIteration

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The MaxLoopIteration option lets you get or set the maximum of iteration allowed for a loop (do, while, for, foreach). For example, if you execute an expression from a user input but want to avoid an infinite loop, you can set the option `MaxLoopIteration = 25` to limit it to 25 iterations. By default, the MaxLoopIteration value is `null` (unlimited).

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In this example, we will first execute a code in a `while` loop that will iterate 100 times. Then we will set the `MaxLoopIteration = 25` and execute the same code again, but this time will throw as it will reaches the maximum loop allowed in an expression.

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

*/

​

using System;

using System.Collections.Generic;

using System.Reflection;

using Z.Expressions;

​

public class Program

{

    public static void Main()

    {

        // Global Context: EvalManager.MaxLoopIteration = 25;

        var context = new EvalContext();

        // without MaxLoopIteration

        {

            var r1 = context.Execute<int>(@"

var i = 0;

​

while (i < 100)

{

    i++

}

​

return i;");

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

        }

​

        // with MaxLoopIteration

        {

            context.MaxLoopIteration = 25;

            try

            {

                var fail = context.Execute<int>(@"

var i = 0;

​

while (i < 100)

{

    i++

}

​

return i;");

            }

            catch(Exception ex)

            {

                Console.WriteLine("2 - Exception: " + ex.Message);

            }

        }

    }

    public class Entity

    {

        public int EntityID { get; set; }

    }

}

​

​