this 应怎么改？

Question

public ConfigGraph this[int iGraphID]
        {
            get
            {
                if (this.m_hashConfigs == null)
                {
                    return null;
                }
                return (ConfigGraph) this.m_hashConfigs.get_Item(iGraphID);
            }
        }错误 CS0111: 类型“Lighthouse.LmsExpress.Graphs.GraphCollection”已定义了一个名为“this”的具有相同参数类型的成员

Answer 1

public ConfigGraph this[int iGraphID]你这里有个 this，太奇怪了哦！
请问你这是什么东东？ this是关键词，不要试图用它来作成员变量！

Answer 2

   class Class1
    {
        static void Main(string[] args)
        {
            Model m = new Model();
            m[3] = "a";
            Console.WriteLine(m[3]);
        }
    }
    public class Model
    {
        private string[] str;
        public Model()
        {
            str = new string[5];
        }
        public string this[int index]
        {
            get
            {
                if (index >= 0 && index < str.Length)
                    return str[index];
                else
                    return "";
            }
            set
            {
                if (index >= 0 && index < str.Length)
                    str[index] = value;
            }
        }
    }

Answer 3

两个类之间存在继承吗，那么要么用new去覆盖或者用override去重载
public new ConfigGraph this[int iGraphID]
或
public override ConfigGraph this[int iGraphID]

Answer 4

正确。
to 1L: this是indexer

Answer 5

热乎乎的索引器demo
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            School mc = new School("高三一班");
            mc.Students["b"].say();
            mc.Students[1].say();            Console.ReadKey();
        }
    }    class Student
    {
        Student[] stus = new Student[3];
        public Student(string _name, int _age)
        {
            this.Name = _name;
            this.Age = _age;
        }
        public Student()
        {
            stus[0] = new Student("a", 21);
            stus[1] = new Student("b", 33);
            stus[2] = new Student("c", 44);
        }
        public void say()
        {
            Console.WriteLine("大家好，我叫{0}，今年{1}岁!", name, age);
        }        private string name;
        public string Name
        {
            get { return name; }
            set { name = value; }
        }        private int age;
        public int Age
        {
            get { return age; }
            set { age = value; }
        }
        public Student this[int index]
        {
            get { return stus[index]; }
        }        public Student this[string name]
        {
            get
            {
                int j = -1;
                bool equalse = false;
                for (int i = 0; i < stus.Length; i++)
                {
                    if (stus[i].name == name)
                    {
                        j = i;
                        equalse = true;
                        break;
                    }
                }
                if (equalse)
                {
                    return stus[j];
                }
                else
                {
                    return null;
                }
            }
        }
    }    class School
    {
        //构造函数
        public School(string name)
        {
            this.Name = name;
            this.Students = new Student();
        }        //班级名字
        private string name;
        public string Name
        {
            get { return name; }
            set { name = value; }
        }        //班级学生
        private Student students;
        public Student Students
        {
            get { return students; }
            set { students = value; }
        }
    }
}