userloginform.cs

C#2.0宝典源码,C#经典书籍,很多例子

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using StudentsMIS.Security;

namespace StudentsMIS.WinForm
{
	/// <summary>
	/// UserLoginForm 的摘要说明。
	/// </summary>
	public class UserLoginForm : System.Windows.Forms.Form
	{
    private System.Windows.Forms.Label label1;
    private System.Windows.Forms.Label label2;
    private System.Windows.Forms.TextBox txtUserID;
    private System.Windows.Forms.TextBox txtUserPwd;
    private System.Windows.Forms.Button btnCancel;
    private System.Windows.Forms.Button btnOK;
		/// <summary>
		/// 必需的设计器变量。
		/// </summary>
		private System.ComponentModel.Container components = null;

		public UserLoginForm()
		{
			//
			// 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.btnCancel = new System.Windows.Forms.Button();
      this.btnOK = new System.Windows.Forms.Button();
      this.label1 = new System.Windows.Forms.Label();
      this.label2 = new System.Windows.Forms.Label();
      this.txtUserID = new System.Windows.Forms.TextBox();
      this.txtUserPwd = new System.Windows.Forms.TextBox();
      this.SuspendLayout();
      // 
      // btnCancel
      // 
      this.btnCancel.BackColor = System.Drawing.SystemColors.Control;
      this.btnCancel.DialogResult = System.Windows.Forms.DialogResult.Cancel;
      this.btnCancel.Location = new System.Drawing.Point(136, 104);
      this.btnCancel.Name = "btnCancel";
      this.btnCancel.TabIndex = 0;
      this.btnCancel.Text = "关闭";
      this.btnCancel.Click += new System.EventHandler(this.button1_Click);
      // 
      // btnOK
      // 
      this.btnOK.BackColor = System.Drawing.SystemColors.Control;
      this.btnOK.Location = new System.Drawing.Point(48, 104);
      this.btnOK.Name = "btnOK";
      this.btnOK.TabIndex = 1;
      this.btnOK.Text = "确定";
      this.btnOK.Click += new System.EventHandler(this.button2_Click);
      // 
      // label1
      // 
      this.label1.BackColor = System.Drawing.Color.Transparent;
      this.label1.Location = new System.Drawing.Point(28, 32);
      this.label1.Name = "label1";
      this.label1.Size = new System.Drawing.Size(64, 23);
      this.label1.TabIndex = 2;
      this.label1.Text = "用户名：";
      this.label1.TextAlign = System.Drawing.ContentAlignment.MiddleRight;
      // 
      // label2
      // 
      this.label2.BackColor = System.Drawing.Color.Transparent;
      this.label2.Location = new System.Drawing.Point(28, 64);
      this.label2.Name = "label2";
      this.label2.Size = new System.Drawing.Size(64, 23);
      this.label2.TabIndex = 3;
      this.label2.Text = "密  码：";
      this.label2.TextAlign = System.Drawing.ContentAlignment.MiddleRight;
      // 
      // txtUserID
      // 
      this.txtUserID.Location = new System.Drawing.Point(104, 32);
      this.txtUserID.MaxLength = 20;
      this.txtUserID.Name = "txtUserID";
      this.txtUserID.Size = new System.Drawing.Size(120, 21);
      this.txtUserID.TabIndex = 4;
      this.txtUserID.Text = "";
      // 
      // txtUserPwd
      // 
      this.txtUserPwd.Location = new System.Drawing.Point(104, 64);
      this.txtUserPwd.MaxLength = 20;
      this.txtUserPwd.Name = "txtUserPwd";
      this.txtUserPwd.PasswordChar = '*';
      this.txtUserPwd.Size = new System.Drawing.Size(120, 21);
      this.txtUserPwd.TabIndex = 5;
      this.txtUserPwd.Text = "";
      // 
      // UserLoginForm
      // 
      this.AcceptButton = this.btnOK;
      this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
      this.BackColor = System.Drawing.SystemColors.Control;
      this.CancelButton = this.btnCancel;
      this.ClientSize = new System.Drawing.Size(266, 160);
      this.Controls.Add(this.txtUserPwd);
      this.Controls.Add(this.txtUserID);
      this.Controls.Add(this.label2);
      this.Controls.Add(this.label1);
      this.Controls.Add(this.btnOK);
      this.Controls.Add(this.btnCancel);
      this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedDialog;
      this.HelpButton = true;
      this.MaximizeBox = false;
      this.Name = "UserLoginForm";
      this.ShowInTaskbar = false;
      this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;
      this.Text = "用户登录";
      this.TopMost = true;
      this.ResumeLayout(false);

    }
		#endregion

    private void button1_Click(object sender, System.EventArgs e)
    {
      this.DialogResult = DialogResult.Cancel;
      this.Close();
    }

    private void button2_Click(object sender, System.EventArgs e)
    {
      if(txtUserID.Text.Trim() == "")
      {
        MessageBox.Show("请先输入用户名!");
        return;
      }
      else if(txtUserPwd.Text.Trim() == "")
      {
        MessageBox.Show("请先输入用户密码!");
        return;
      }
      else
      {
        User user = new User(txtUserID.Text.Trim(),txtUserPwd.Text.Trim());
        switch(user.Valid)
        {
          case 0 : MessageBox.Show("对不起，不存在此用户!");break;
          case 1 : MessageBox.Show("对不起，密码不正确!");break;
          case 2 :
          {
            CommonValue.userID = user.UserID;
            CommonValue.userLevel = user.UserLevel;
            this.DialogResult = DialogResult.OK;
            this.Close();
            break;
          }
        }
      }      
    }
	}
}