自己写个类实现字符串类的一些简单功能

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

namespace 字符串
{
    class stringDG
    {
        public  char[] date;//字符串本质上是一个数组，是一个字符型数组
        /// <summary>
        /// 给类添加一个构造函数，在创建对象时可以对对象进行赋值，这个构造函数可以把字符数组转化成字符串
        /// </summary>
        /// <param name="array"></param>
        public stringDG(char[] array)
        {
            date = new char[array.Length];//确定字符串数组的长度
            for (int i = 0; i < array.Length; i++)
            {
                date[i] = array[i];
            }
        }
        /// <summary>
        /// stringDg类的构造函数，在创建对象时，把字符串内容传入类中
        /// </summary>
        /// <param name="array"></param>
        public stringDG(stringDG array)
        {
            date = new char[array.GetLength];
            for (int i = 0; i < array.GetLength; i++)
            {
                date[i] = array.date[i];
            }

        }
        //空构造函数
        public stringDG()
        {

        }
        /// <summary>
        /// 获取字符串的长度
        /// </summary>
        /// <param name="array"></param>
        /// <returns></returns>
        public int  GetLength
        {
           get
            {
               return date.Length;
            }
        }
        /// <summary>
        /// 截取字符串
        /// </summary>
        /// <param name="index"></param>
        /// <param name="length"></param>
        /// <returns></returns>
        public stringDG SubString(int index,int length)
        {
            char[] str = new char[length];
            int temp = 0;
            for (int i = index; i < index+length; i++)
            {
                str[temp] = date[i];
            }
            return new stringDG(str);
        }
        /// <summary>
        /// 通过下标获取字符
        /// </summary>
        /// <param name="index"></param>
        /// <returns></returns>
        public char GetValue(int index)
        {
            return date[index];
        }

       
    }
}