C# 使用错误提醒控件

【实例截图】

【核心代码】

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;

namespace ErrorTip
{
	/// <summary>
	/// Form1 的摘要说明。
	/// </summary>
	public class Form1 : System.Windows.Forms.Form
	{
		private System.Windows.Forms.GroupBox groupBox1;
		private System.Windows.Forms.Label label1;
		private System.Windows.Forms.TextBox textBox1;
		private System.Windows.Forms.TextBox textBox2;
		private System.Windows.Forms.Label label2;
		private System.Windows.Forms.TextBox textBox3;
		private System.Windows.Forms.Label label3;
		private System.Windows.Forms.Label label4;
		private System.Windows.Forms.Button button1;
        private System.Windows.Forms.ErrorProvider errorProvider1;
        private IContainer components;

		public Form1()
		{
			//
			// Windows 窗体设计器支持所必需的
			//
			InitializeComponent();

			//
			// TODO: 在 InitializeComponent 调用后添加任何构造函数代码
			//
		}

		/// <summary>
		/// 清理所有正在使用的资源。
		/// </summary>
		protected override void Dispose( bool disposing )
		{
			if( disposing )
			{
				if (components != null) 
				{
					components.Dispose();
				}
			}
			base.Dispose( disposing );
		}

		#region Windows 窗体设计器生成的代码
		/// <summary>
		/// 设计器支持所需的方法 - 不要使用代码编辑器修改
		/// 此方法的内容。
		/// </summary>
		private void InitializeComponent()
		{
            this.components = new System.ComponentModel.Container();
            this.groupBox1 = new System.Windows.Forms.GroupBox();
            this.textBox3 = new System.Windows.Forms.TextBox();
            this.label3 = new System.Windows.Forms.Label();
            this.textBox2 = new System.Windows.Forms.TextBox();
            this.label2 = new System.Windows.Forms.Label();
            this.textBox1 = new System.Windows.Forms.TextBox();
            this.label1 = new System.Windows.Forms.Label();
            this.label4 = new System.Windows.Forms.Label();
            this.button1 = new System.Windows.Forms.Button();
            this.errorProvider1 = new System.Windows.Forms.ErrorProvider(this.components);
            this.groupBox1.SuspendLayout();
            ((System.ComponentModel.ISupportInitialize)(this.errorProvider1)).BeginInit();
            this.SuspendLayout();
            // 
            // groupBox1
            // 
            this.groupBox1.Controls.Add(this.textBox3);
            this.groupBox1.Controls.Add(this.label3);
            this.groupBox1.Controls.Add(this.textBox2);
            this.groupBox1.Controls.Add(this.label2);
            this.groupBox1.Controls.Add(this.textBox1);
            this.groupBox1.Controls.Add(this.label1);
            this.groupBox1.Location = new System.Drawing.Point(24, 24);
            this.groupBox1.Name = "groupBox1";
            this.groupBox1.Size = new System.Drawing.Size(280, 104);
            this.groupBox1.TabIndex = 0;
            this.groupBox1.TabStop = false;
            this.groupBox1.Text = "用户注册信息";
            // 
            // textBox3
            // 
            this.textBox3.Location = new System.Drawing.Point(128, 72);
            this.textBox3.Name = "textBox3";
            this.textBox3.PasswordChar = '*';
            this.textBox3.Size = new System.Drawing.Size(136, 21);
            this.textBox3.TabIndex = 5;
            // 
            // label3
            // 
            this.label3.Location = new System.Drawing.Point(16, 72);
            this.label3.Name = "label3";
            this.label3.Size = new System.Drawing.Size(104, 16);
            this.label3.TabIndex = 4;
            this.label3.Text = "请确认用户密码：";
            // 
            // textBox2
            // 
            this.textBox2.Location = new System.Drawing.Point(128, 48);
            this.textBox2.Name = "textBox2";
            this.textBox2.PasswordChar = '*';
            this.textBox2.Size = new System.Drawing.Size(136, 21);
            this.textBox2.TabIndex = 3;
            // 
            // label2
            // 
            this.label2.Location = new System.Drawing.Point(16, 48);
            this.label2.Name = "label2";
            this.label2.Size = new System.Drawing.Size(104, 16);
            this.label2.TabIndex = 2;
            this.label2.Text = "请输入用户密码：";
            // 
            // textBox1
            // 
            this.textBox1.Location = new System.Drawing.Point(128, 24);
            this.textBox1.Name = "textBox1";
            this.textBox1.Size = new System.Drawing.Size(136, 21);
            this.textBox1.TabIndex = 1;
            // 
            // label1
            // 
            this.label1.Location = new System.Drawing.Point(16, 24);
            this.label1.Name = "label1";
            this.label1.Size = new System.Drawing.Size(100, 16);
            this.label1.TabIndex = 0;
            this.label1.Text = "请输入用户名：";
            // 
            // label4
            // 
            this.label4.Location = new System.Drawing.Point(24, 136);
            this.label4.Name = "label4";
            this.label4.Size = new System.Drawing.Size(216, 16);
            this.label4.TabIndex = 1;
            this.label4.Text = "用户名和密码长度为6-12位字符或数字";
            // 
            // button1
            // 
            this.button1.Location = new System.Drawing.Point(240, 136);
            this.button1.Name = "button1";
            this.button1.Size = new System.Drawing.Size(64, 23);
            this.button1.TabIndex = 2;
            this.button1.Text = "确认";
            this.button1.Click  = new System.EventHandler(this.button1_Click);
            // 
            // errorProvider1
            // 
            this.errorProvider1.ContainerControl = this;
            // 
            // Form1
            // 
            this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
            this.ClientSize = new System.Drawing.Size(328, 174);
            this.Controls.Add(this.button1);
            this.Controls.Add(this.label4);
            this.Controls.Add(this.groupBox1);
            this.MaximizeBox = false;
            this.Name = "Form1";
            this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;
            this.Text = "演示使用错误提醒控件";
            this.groupBox1.ResumeLayout(false);
            this.groupBox1.PerformLayout();
            ((System.ComponentModel.ISupportInitialize)(this.errorProvider1)).EndInit();
            this.ResumeLayout(false);

		}
		#endregion

		/// <summary>
		/// 应用程序的主入口点。
		/// </summary>
		[STAThread]
		static void Main() 
		{
			Application.Run(new Form1());
		}

		private void button1_Click(object sender, System.EventArgs e)
		{//检验用户数据输入结果
			if(this.textBox1.Text.Length>12||this.textBox1.Text.Length<6)
			{
				this.errorProvider1.SetError(this.textBox1,"用户名输入错误");
				DialogResult ReturnDlg=MessageBox.Show(this,"用户名输入错误，是否从新输入？","信息提示",
					MessageBoxButtons.RetryCancel,MessageBoxIcon.Question);
				switch(ReturnDlg)
				{
					case DialogResult.Retry:
						this.textBox1.Text="";
						break;
					case DialogResult.Cancel:						
						break;				
				}				
			}
			if(this.textBox2.Text.Length>12||this.textBox2.Text.Length<6)
			{
				this.errorProvider1.SetError(this.textBox2,"用户密码输入错误");
				DialogResult ReturnDlg=MessageBox.Show(this,"用户密码输入错误，是否从新输入？","信息提示",
					MessageBoxButtons.RetryCancel,MessageBoxIcon.Question);
				switch(ReturnDlg)
				{
					case DialogResult.Retry:
						this.textBox2.Text="";
						break;
					case DialogResult.Cancel:						
						break;				
				}				
			}
			if(!(this.textBox2.Text==this.textBox3.Text))
			{
				this.errorProvider1.SetError(this.textBox3,"用户密码两次输入不一致");
				DialogResult ReturnDlg=MessageBox.Show(this,"用户密码两次输入不一致，是否从新输入？","信息提示",
					MessageBoxButtons.RetryCancel,MessageBoxIcon.Question);
				switch(ReturnDlg)
				{
					case DialogResult.Retry:
						this.textBox3.Text="";
						break;
					case DialogResult.Cancel:						
						break;				
				}				
			}

		}
	}
}