csharp Advanced Exercises: a list of objects in the form of equation [Difficulty: Level 2] - view the C # programming classic exam, exercises of varying difficulty C #, C # novice suitable for self-study of advanced training

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Advanced title csharp practice: the list of objects in the form of equation [Difficulty: Level 2]:

Your task is to write a list of objects on extension methods ** ** and returns an integer to solve the equation.
List includes integers and strings, and Null.

List the following format:

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List  objectList = new List (){2," - ",82,"+",802,"+",62," - ",23," - ",924,"+", 1,"+",200,"+",null,"+",102,"+",300," - ",10,"=",924};

null is a red box, you have to find an integer to solve the equation.
Digital is an integer, the operator ( "+", "-", "=") is a string.

Programming objectives:

namespace BlankExtention {
using System;
using System.Collections.Generic;
using System.Linq;
  public static class Kata
    {
        public static int CalculateBlank(this List objectList)
        {
            //Happy Coding
        }
    }
}

Test sample:

namespace BlankExtention {
  using NUnit.Framework;
  using System.Collections.Generic;
  using System.Linq;
  using System;
  [TestFixture]
    public class MyTest
    {
        {
            List objectList = new List() { 2, "-", 82, "+", 802, "+", 62, "-", 23, "-", 924, "+", 1, "+", 200, "+", null, "+", 102, "+", 300, "-", 10, "=", 924 };
            Assert.AreEqual(494,objectList.CalculateBlank());
        }
        [Test]
        public void SecondTest()

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