设计界面：
编写代码：
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
namespace aa
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
int n = 0;
string[] words = new string[100];
int[] number = new int[100];
for (int i = 0; i < textBox1.Text.Length - 2; i++)
{
bool flag = false; //判断单词是否发生重复
string sleft=textBox1 .Text .Substring (i,2);
for (int j = i + 2; j < textBox1.Text.Length - 2;j++ )
{
string sright = textBox1.Text.Substring(j,2);
if(sleft ==sright )
{
number[n]++;
if(Array .IndexOf (words ,sright )==-1)
{
flag = true;
words[n] = sright;
}
}
}
if (flag == true)//如果找到了重复的单词，单词数组中的索引值加1
{
n++;
}
}
label2.Text = string.Format("一共有{0}个重复的词汇",n);
for (int z = 0; z < n;z++ )
{
label2.Text += string.Format("\n\n\n单词：“{0}”重复{1}次?", words[z], number[z] + 1);
}
}
}
}
运行结果：
