// C# Eval Expression

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

​

// @nuget: Z.Expressions.Eval

​

/*

## BindingFlags

​

The BindingFlags option lets you get or set the flags when searching for a member (Property, Field, Method). By default, the BindingFlags value is `BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.FlattenHierarchy | BindingFlags.IgnoreCase`.

​

In this example, we will first evaluate an expression by accessing a property with the wrong casing, which will succeed as the library is case insensitive by default. Then, we will remove the `IgnoreCase` flag and try again to access the property value, which will raise an error.

​

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.DefaultContext.BindingFlags = BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.FlattenHierarchy;

        var context = new EvalContext();

        var entity = new Entity() { EntityID = 13 };

        var entityID = context.Execute("entity.enTItyiD", new { entity });

        Console.WriteLine("1 - EntityID: " + entityID);

        try

        {

            context.BindingFlags = BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.FlattenHierarchy;

            // or: context.BindingFlags &= ~BindingFlags.IgnoreCase;

            var fail = context.Execute("entity.enTItyiD", new { entity });

        }

        catch(Exception ex)

        {

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

        }

    }

    public class Entity

    {

        public int EntityID { get; set; }

    }

}

​

​