// Entity Framework Classic

// Doc: https://entityframework-classic.net/csharp-eval-expression

​

// @nuget: Z.EntityFramework.Classic

​

​

using System;

using System.Collections.Generic;

using System.Dynamic;

using Z.Expressions;

namespace test{

​

public class Program

{

    public static void Main()

    {

        var formula = @"((StringHelper.Contains((Obj.GetFieldValue<System.String>(""PositionCode"")??"""" ),Value)) || (StringHelper.Contains((Obj.GetFieldValue<System.String>(""FullName"")??"""" ),Value)) || (StringHelper.Contains((Obj.GetFieldValue<System.String>(""JobTitle"")??"""" ),Value)) || (StringHelper.Contains((Obj.GetFieldValue<System.String>(""EmployeeCode"")??"""" ),Value)))";                              

        var result = Eval.Compile<Func<string, bool>>(formula);                 

        Console.WriteLine(result);

    }

​

}

     public static class StringHelper

    {

        /// <summary>

        /// This method is used in a string based c# expression to build a search formula, 

        /// which is why this method has no direct references

        /// </summary>

        /// <param name="str1"></param>

        /// <param name="str2"></param>

        /// <returns></returns>

        public static bool Contains(string str1, string str2)

        {

            if (str1 == null || str2 == null) return false;

​

            return str1.IndexOf(str2, StringComparison.OrdinalIgnoreCase) >= 0;

        }

​

        /// <summary>

        /// This method is used in a string based c# expression to build a search formula, 

        /// which is why this method has no direct references

        /// </summary>

        /// <param name="str1"></param>

        /// <param name="str2"></param>

        /// <returns></returns>

        public static bool StartsWith(string str1, string str2)

        {

            if (str1 == null || str2 == null) return false;

​

            return str1.StartsWith(str2, StringComparison.OrdinalIgnoreCase);

        }

        /// <summary>

        /// This method is to sanitize string

        /// </summary>

        /// <param name="logString"></param>

        /// <returns></returns>

        public static string SanitizeString(string logString)

        {

            return System.Net.WebUtility.UrlEncode(logString);

        }

    }

}

​

​