爱心加油站

Question

请好心人帮忙解决一下
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 UseCombox
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }        private void Form1_Load(object sender, EventArgs e)
        {
            for(int i=00;i< 10;i++)
            {
                this.comboBox1.Items.Add(i.ToString("D2"));
            }
            this.comboBox1.SelectedIndexChanged += new EventHandler(comboBox1_SelectedIndexChanged);            this.comboBox1.SelectedIndex = 0;
            
        }
        void comboBox1_SelectedIndexChanged(object sender,EventHandler e)
        {
            string str = "当前选中:Index = " + this.comboBox1.SelectedIndex.ToString() + ",value='" + (string)this.comboBox1.SelectedItem + "'";
            this.label1.Text = str;
        }        private void button2_Click(object sender, EventArgs e)
        {
            string str = this.label1.Text.Trim();
            if (!string.IsNullOrEmpty(str))
                this.comboBox1.Items.Add(str);
        }        private void button1_Click(object sender, EventArgs e)
        {
            if (this.comboBox1.SelectedIndex >= 0)
                this.comboBox1.Items.RemoveAt(this.comboBox1.SelectedIndex);
            else
                MessageBox.Show("没有任何选中项，请先选中！");
        }
    }
}
错误原因：错误 1 “comboBox1_SelectedIndexChanged”的重载均与委托“System.EventHandler”不匹配

Answer 1

void comboBox1_SelectedIndexChanged(object sender,EventHandler e)
手写写错了把。
应该是
void comboBox1_SelectedIndexChanged(object sender,EventArgs e)

Answer 2

哈哈
ComboBox1.SelectedIndexChanged+=，按Tab键，VS自动填充~~~