泛型<T>，是你肿莫了，还是我错了...

委托自定义数组排序 项目一共三个文件如下。

CSort.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace 委托自定义数组排序
{
    class CSort<T>
    {
        public CSort()
        {

        }
        /// <summary>
        /// 
        /// </summary>
        /// <param name="arrObj"></param>
        internal void Show(T[] arrObj)
        {
            foreach (T item in arrObj)
            {
                Console.Write(item.ToString() + " ");
            }
        }
        /// <summary>
        /// 
        /// </summary>
        /// <param name="arrObj"></param>
        /// <param name="comp"></param>
        internal void Sort(T[] arrObj, Comp<T> comp)
        {
            for (int i = 0; i < arrObj.Length; i++)
            {///arrObj.Length-i-1:至数组的最后一个元素
                for (int j = 0; j < arrObj.Length - i - 1; j++)
                {
                    if (comp(arrObj[j], arrObj[j + 1]) > 0)
                    {
                        T obj = arrObj[j];
                        arrObj[j] = arrObj[j + 1];
                        arrObj[j + 1] = obj;
                    }
                }
            }
        }
        /// <summary>
        /// 
        /// </summary>
        /// <param name="one"></param>
        /// <param name="two"></param>
        /// <returns></returns>
        public int CompObj(T one, T two)
        {
            if (typeof(int) is T)
            {
                return int.Parse(one.ToString()) - int.Parse(two.ToString());
            }
            if (typeof(string) is T)
            {
                return (one.ToString()).Length - (two.ToString()).Length;
            }
            //if (typeof(Person) is T)
            //    return ((Person)one).Age - ((Person)two).Age;
            return 0;
        }
        //public int CompObj(string one, string two)
        //{
        //    return one.Length - two.Length;
        //}

        //public int CompObj(int one, int two)
        //{
        //    return one - two;
        //}

    }
    //class Person
    //{
    //    /// <summary>
    //    /// 年龄
    //    /// </summary>
    //    private int age;
    //    /// <summary>
    //    /// 年龄
    //    /// </summary>
    //    public int Age
    //    {
    //        get { return age; }
    //        set { age = value; }
    //    }
    //    /// <summary>
    //    /// 名字
    //    /// </summary>
    //    private string name;
    //    /// <summary>
    //    /// 名字
    //    /// </summary>
    //    public string Name
    //    {
    //        get { return name; }
    //        set { name = value; }
    //    }
    //    /// <summary>
    //    /// 性别
    //    /// </summary>
    //    private string sex;
    //    /// <summary>
    //    /// 性别
    //    /// </summary>
    //    public string Sex
    //    {
    //        get { return sex; }
    //        set { sex = value; }
    //    }
    //}
}

Program.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace 委托自定义数组排序
{
    class Program
    {
        static void Main(string[] args)
        {
            int[] arrInt = new int[] { 1, 3, 1, 2, 3, 5, 6, 2, 4 };
            string[] arrString = new string[] { "ab", "abc", "a", "abcd", "abc", "abcdef", "abcde" };
            //Person[] arrPerson ={new Person(){Age=18,Name="ab",Sex=null},
            //               new Person(){Age=17,Name="a",Sex=null}};

            CSort<string> s = new CSort<string>();
            CSort<int> i = new CSort<int>();
            //CSort<Person> p = new CSort<Person>();
            s.Sort(arrString, s.CompObj);
            i.Sort(arrInt, i.CompObj);
            i.Show(arrInt);
            //p.Sort(arrPerson, p.CompObj);
            Console.WriteLine();
            s.Show(arrString);
            //Type type2= arrInt.GetType();
            //do
            //{
            //    type2 = type2.BaseType;
            ////Console.WriteLine(type2.ToString());

            //} while (type2 != null);
            ////Console.WriteLine(arrInt.GetType().BaseType.BaseType.BaseType.ToString());
            Console.ReadKey();
        }
       
    }
}

CSortDelegate.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace 委托自定义数组排序
{
    public delegate int Comp<T>(T one, T two);
}

运行没有错误！！！可是却也没有结果！！！

监视 T 却出现：

T “T”是一个“类型形参”，这在给定的上下文中无效

这是为什么？？？