Winform 使用ErrorProvider组件验证数据

1、在Winform窗体上放置一个文本框,如textBox1

2、从工具栏中双击ErrorProvider控件,添加一个ErrorProvider控件;也可以通过编码完成

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 WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        //实例化一个ErrorProvider
        ErrorProvider errorUser = new ErrorProvider();

        private void Form1_Load(object sender, EventArgs e)
        {
            //dataGridView1.ColumnHeadersHeight = 60;
            //dataGridView1.Columns[2].HeaderCell.Style.BackColor = Color.Red;//表头背景色
            //dataGridView1.Columns[3].HeaderCell.Style.ForeColor = Color.Blue;//表头字体颜色

            //设置其闪烁样式
            //BlinkIfDifferentError 当图标已经显示并且为控件设置了新的错误字符串时闪烁。
            //AlwaysBlink 总是闪烁。
            //NeverBlink 错误图标从不闪烁。
            errorUser.BlinkStyle = ErrorBlinkStyle.NeverBlink;

            //错误图标的闪烁速率（以毫秒为单位）。默认为 250 毫秒
            //errorUser.BlinkRate = 1000;
        }

        bool errFlag = true;
        private void textBox1_Validating(object sender, CancelEventArgs e)
        {
            switch (textBox1.Text.Trim())
            {
                case "11":
                    errorUser.SetError(textBox1, "输入的字符不能为11");
                    errFlag = false;
                    break;
                default:
                    errorUser.SetError(textBox1, "");
                    errFlag = true;
                    break;
            }
        }

        private void textBox2_Validating(object sender, CancelEventArgs e)
        {
            switch (textBox2.Text.Trim())
            {
                case "22":
                    errorUser.SetError(textBox2, "输入的字符不能为22");
                    errFlag = false;
                    break;
                default:
                    errorUser.SetError(textBox2, "");
                    errFlag = true;
                    break;
            }
        }

        private void btnOk_Click(object sender, EventArgs e)
        {
            if (!errFlag) MessageBox.Show("数据输入有误！", "提示", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
        }

    }
}