frmlogin.cs

一个学籍管理系统 以在某高校投入使用了

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

namespace prjLogin
{
	/// <summary>
	/// Form1 的摘要说明。
	/// </summary>
	public class frmLogin : System.Windows.Forms.Form
	{
		public event LoginHandler LoginEvent;
		private System.Windows.Forms.Label label1;
		private System.Windows.Forms.TextBox txtName;
		private System.Windows.Forms.Button btnOK;
		private System.Windows.Forms.Button btnCancle;
		private System.Windows.Forms.TextBox txtPwd;
		private System.Windows.Forms.Label label2;
		/// <summary>
		/// 必需的设计器变量。
		/// </summary>
		private System.ComponentModel.Container components = null;
		public delegate void  LoginHandler(string user,string pur);
		private string pur;
		private string user;
		private bool loginFlag = false; 

		public frmLogin()
		{
			//
			// 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()
		{
			System.Resources.ResourceManager resources = new System.Resources.ResourceManager(typeof(frmLogin));
			this.label1 = new System.Windows.Forms.Label();
			this.txtName = new System.Windows.Forms.TextBox();
			this.btnOK = new System.Windows.Forms.Button();
			this.btnCancle = new System.Windows.Forms.Button();
			this.txtPwd = new System.Windows.Forms.TextBox();
			this.label2 = new System.Windows.Forms.Label();
			this.SuspendLayout();
			// 
			// label1
			// 
			this.label1.Location = new System.Drawing.Point(64, 32);
			this.label1.Name = "label1";
			this.label1.Size = new System.Drawing.Size(48, 16);
			this.label1.TabIndex = 0;
			this.label1.Text = "用户名";
			// 
			// txtName
			// 
			this.txtName.Location = new System.Drawing.Point(112, 32);
			this.txtName.Name = "txtName";
			this.txtName.Size = new System.Drawing.Size(152, 21);
			this.txtName.TabIndex = 1;
			this.txtName.Text = "";
			// 
			// btnOK
			// 
			this.btnOK.BackColor = System.Drawing.SystemColors.ControlText;
			this.btnOK.ForeColor = System.Drawing.SystemColors.HighlightText;
			this.btnOK.Location = new System.Drawing.Point(64, 144);
			this.btnOK.Name = "btnOK";
			this.btnOK.TabIndex = 3;
			this.btnOK.Text = "确定";
			this.btnOK.Click += new System.EventHandler(this.btnOK_Click);
			// 
			// btnCancle
			// 
			this.btnCancle.BackColor = System.Drawing.SystemColors.ControlText;
			this.btnCancle.ForeColor = System.Drawing.SystemColors.HighlightText;
			this.btnCancle.Location = new System.Drawing.Point(216, 144);
			this.btnCancle.Name = "btnCancle";
			this.btnCancle.TabIndex = 4;
			this.btnCancle.Text = "取消";
			this.btnCancle.Click += new System.EventHandler(this.btnCancle_Click);
			// 
			// txtPwd
			// 
			this.txtPwd.Location = new System.Drawing.Point(112, 95);
			this.txtPwd.Name = "txtPwd";
			this.txtPwd.PasswordChar = '*';
			this.txtPwd.Size = new System.Drawing.Size(152, 21);
			this.txtPwd.TabIndex = 2;
			this.txtPwd.Text = "";
			// 
			// label2
			// 
			this.label2.Location = new System.Drawing.Point(64, 95);
			this.label2.Name = "label2";
			this.label2.Size = new System.Drawing.Size(48, 16);
			this.label2.TabIndex = 4;
			this.label2.Text = "密码";
			// 
			// frmLogin
			// 
			this.AcceptButton = this.btnOK;
			this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
			this.BackColor = System.Drawing.SystemColors.ControlText;
			this.BackgroundImage = ((System.Drawing.Image)(resources.GetObject("$this.BackgroundImage")));
			this.ClientSize = new System.Drawing.Size(338, 191);
			this.ControlBox = false;
			this.Controls.Add(this.txtPwd);
			this.Controls.Add(this.label2);
			this.Controls.Add(this.btnCancle);
			this.Controls.Add(this.btnOK);
			this.Controls.Add(this.txtName);
			this.Controls.Add(this.label1);
			this.ForeColor = System.Drawing.SystemColors.ControlLightLight;
			this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.None;
			this.MaximizeBox = false;
			this.Name = "frmLogin";
			this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;
			this.Text = "请您登录";
			this.Closing += new System.ComponentModel.CancelEventHandler(this.frmLogin_Closing);
			this.Load += new System.EventHandler(this.frmLogin_Load);
			this.ResumeLayout(false);

		}
		#endregion

		
		
		
		/// <summary>
		/// 检查用户名及密码是否正确
		/// </summary>
		/// <returns></returns>
		private bool check()
		{
			bool flag = false;
			DataAccess da = new DataAccess();
			string Sql = "select * from Class..UserInfo where UserID = '"+this.txtName.Text+"' and UserPwd = '"+this.txtPwd.Text+"'";
			try
			{
				SqlDataReader sr = da.ExecuteQuery(Sql);
				while(sr.Read()==true)
				{
					if(sr.HasRows==true)
					{
						this.user=sr.GetValue(0).ToString();
						this.pur=sr.GetValue(2).ToString();
						flag=true;
					}
				}
				sr.Close();
			}
			finally
			{
				da.CloseCnn();
			}
			if(flag==true)
			{
				return true;
			}
			else
			{
				return false;
			}
		}
		private void btnOK_Click(object sender, System.EventArgs e)
		{	
			if(check()==true)
			{
				if(this.LoginEvent!=null)
				{
					this.LoginEvent(this.user,this.pur);
				}
				this.loginFlag=true;
				this.Close();
			}
			else
			{
				MessageBox.Show("输入有误","提示信息",MessageBoxButtons.OK,MessageBoxIcon.Question);
			}
		}

		private void frmLogin_Load(object sender, System.EventArgs e)
		{
		
		}

		private void btnCancle_Click(object sender, System.EventArgs e)
		{
			this.loginFlag=false;
			this.Close();
		}

		private void frmLogin_Closing(object sender, System.ComponentModel.CancelEventArgs e)
		{
			if(this.loginFlag==false)
			{
				Application.Exit();
			}
		}
	}
}