这里有委托，事件，操作符重载你应该先看看。

knocker knocker的马甲

他们是？

using System;
using System.Collections.Generic;
using
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        string oldvalue = "";
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            string newstr = textBox1.Text;
            newstr = newstr + "1";
            textBox1.Text = newstr;
        }

        private void button2_Click(object sender, EventArgs e)
        {
            string newstr = textBox1.Text;
            newstr = newstr + "2";
            textBox1.Text = newstr;
        }

        private void button3_Click(object sender, EventArgs e)
        {
            string newstr = textBox1.Text;
            newstr = newstr + "3";
            textBox1.Text = newstr;
        }

        private void button4_Click(object sender, EventArgs e)
        {
            string newstr = textBox1.Text;
            newstr = newstr + "4";
            textBox1.Text = newstr;
        }

        private void button5_Click(object sender, EventArgs e)
        {
            string newstr = textBox1.Text;
            newstr = newstr + "5";
            textBox1.Text = newstr;
        }

        private void button6_Click(object sender, EventArgs e)
        {
            string newstr = textBox1.Text;
            newstr = newstr + "6";
            textBox1.Text = newstr;
        }

        private void button7_Click(object sender, EventArgs e)
        {
            string newstr = textBox1.Text;
            newstr = newstr + "7";
            textBox1.Text = newstr;
        }

        private void button8_Click(object sender, EventArgs e)
        {
            string newstr = textBox1.Text;
            newstr = newstr + "8";
            textBox1.Text = newstr;
        }

        private void button9_Click(object sender, EventArgs e)
        {
            string newstr = textBox1.Text;
            newstr = newstr + "9";
            textBox1.Text = newstr;
        }

        private void button10_Click(object sender, EventArgs e)
        {
            string newstr = textBox1.Text;
            newstr = newstr + "0";
            textBox1.Text = newstr;
        }

        private void button12_Click(object sender, EventArgs e)
        {
            oldvalue = textBox1.Text;
            textBox1.Text = "";
        }

        private void button11_Click(object sender, EventArgs e)
        {
            string newvalue = textBox1.Text;
            int v = 0;
            v = int.Parse(oldvalue) + int.Parse(newvalue);
        }

        private void textBox1_TextChanged(object sender, EventArgs e)
        {

        }
    }
}

你是想问什么？看不大懂你的意思。

貌似像是计算器

貌似像是计算器