frmlogin.cs

汽车销售管理系统,进销存系统典范,值得初学者多多学习

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Runtime.InteropServices;
using System.Data;
using System.Data.SqlClient;

namespace MainPrj_CarShop
{
	/// <summary>
	/// frmLogin 的摘要说明。
	/// </summary>
	public class frmLogin : System.Windows.Forms.Form
	{
		private System.Windows.Forms.Label lbluer;
		private System.Windows.Forms.ToolTip toolTip1;
		private System.Windows.Forms.Label label1;
		private System.Windows.Forms.Button btnConfirm;
		private System.Windows.Forms.Button btnCancel;
		private System.Windows.Forms.PictureBox pictureBox1;
		private System.ComponentModel.IContainer components;

		private System.Data.SqlClient.SqlConnection conLogin;
		private System.Windows.Forms.ComboBox cboName;
		private System.Windows.Forms.TextBox txtPwd;
		private System.Windows.Forms.ContextMenu contextMenu1;
		private System.Data.SqlClient.SqlCommand cmdLogin;

		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 )
		{
			try
			{
				if( disposing )
				{
					if(components != null)
					{
						components.Dispose();
					}
				}
				base.Dispose( disposing );
			}
			catch(Exception ex)
			{
				MessageBox.Show("系统发生一个异常的错误！请与管理员联系。\n"+ex.Message,"系统错误",MessageBoxButtons.OK,MessageBoxIcon.Error);
			}
			
		}

		#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.lbluer = new System.Windows.Forms.Label();
			this.cboName = new System.Windows.Forms.ComboBox();
			this.toolTip1 = new System.Windows.Forms.ToolTip(this.components);
			this.label1 = new System.Windows.Forms.Label();
			this.txtPwd = new System.Windows.Forms.TextBox();
			this.btnConfirm = new System.Windows.Forms.Button();
			this.btnCancel = new System.Windows.Forms.Button();
			this.pictureBox1 = new System.Windows.Forms.PictureBox();
			this.contextMenu1 = new System.Windows.Forms.ContextMenu();
			this.SuspendLayout();
			// 
			// lbluer
			// 
			this.lbluer.AutoSize = true;
			this.lbluer.Location = new System.Drawing.Point(88, 91);
			this.lbluer.Name = "lbluer";
			this.lbluer.Size = new System.Drawing.Size(54, 17);
			this.lbluer.TabIndex = 0;
			this.lbluer.Text = "用户名称";
			// 
			// cboName
			// 
			this.cboName.DropDownStyle = System.Windows.Forms.ComboBoxStyle.DropDownList;
			this.cboName.Location = new System.Drawing.Point(144, 88);
			this.cboName.Name = "cboName";
			this.cboName.Size = new System.Drawing.Size(128, 20);
			this.cboName.TabIndex = 1;
			// 
			// label1
			// 
			this.label1.AutoSize = true;
			this.label1.Location = new System.Drawing.Point(88, 124);
			this.label1.Name = "label1";
			this.label1.Size = new System.Drawing.Size(54, 17);
			this.label1.TabIndex = 0;
			this.label1.Text = "用户密码";
			// 
			// txtPwd
			// 
			this.txtPwd.Location = new System.Drawing.Point(144, 120);
			this.txtPwd.Name = "txtPwd";
			this.txtPwd.PasswordChar = '*';
			this.txtPwd.Size = new System.Drawing.Size(128, 21);
			this.txtPwd.TabIndex = 3;
			this.txtPwd.Text = "123456";
			// 
			// btnConfirm
			// 
			this.btnConfirm.DialogResult = System.Windows.Forms.DialogResult.OK;
			this.btnConfirm.Location = new System.Drawing.Point(92, 152);
			this.btnConfirm.Name = "btnConfirm";
			this.btnConfirm.Size = new System.Drawing.Size(64, 24);
			this.btnConfirm.TabIndex = 4;
			this.btnConfirm.Text = "确定(&C)";
			this.btnConfirm.Click += new System.EventHandler(this.btnConfirm_Click);
			// 
			// btnCancel
			// 
			this.btnCancel.DialogResult = System.Windows.Forms.DialogResult.Cancel;
			this.btnCancel.Location = new System.Drawing.Point(204, 152);
			this.btnCancel.Name = "btnCancel";
			this.btnCancel.Size = new System.Drawing.Size(64, 24);
			this.btnCancel.TabIndex = 4;
			this.btnCancel.Text = "取消(&E)";
			this.btnCancel.Click += new System.EventHandler(this.btnCancel_Click);
			// 
			// pictureBox1
			// 
			this.pictureBox1.BackColor = System.Drawing.Color.LightGoldenrodYellow;
			this.pictureBox1.Dock = System.Windows.Forms.DockStyle.Top;
			this.pictureBox1.Location = new System.Drawing.Point(0, 0);
			this.pictureBox1.Name = "pictureBox1";
			this.pictureBox1.Size = new System.Drawing.Size(368, 80);
			this.pictureBox1.TabIndex = 5;
			this.pictureBox1.TabStop = false;
			// 
			// frmLogin
			// 
			this.AcceptButton = this.btnConfirm;
			this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
			this.CancelButton = this.btnCancel;
			this.ClientSize = new System.Drawing.Size(368, 206);
			this.Controls.Add(this.pictureBox1);
			this.Controls.Add(this.btnConfirm);
			this.Controls.Add(this.txtPwd);
			this.Controls.Add(this.cboName);
			this.Controls.Add(this.lbluer);
			this.Controls.Add(this.label1);
			this.Controls.Add(this.btnCancel);
			this.MaximizeBox = false;
			this.MinimizeBox = false;
			this.Name = "frmLogin";
			this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;
			this.Text = "登　陆";
			this.Closing += new System.ComponentModel.CancelEventHandler(this.frmLogin_Closing);
			this.Load += new System.EventHandler(this.frmLogin_Load);
			this.ResumeLayout(false);

		}
		#endregion   

		private void frmLogin_Closing(object sender, System.ComponentModel.CancelEventArgs e)
		{
			
		}

		private	ArrayList li=new ArrayList();
		private void frmLogin_Load(object sender, System.EventArgs e)
		{
			  
			try
			{
				this.conLogin=new System.Data.SqlClient.SqlConnection("server=.;uid=sa;pwd=;database=dbCarsys");
				this.conLogin.Open();
				this.cmdLogin=new System.Data.SqlClient.SqlCommand("select uName,uCode from tblUser",this.conLogin);
				SqlDataReader dr=this.cmdLogin.ExecuteReader();
				while(dr.Read())
				{
					li.Add( new User(dr.GetString(1),dr.GetString(0)));
				}
				dr.Close();
				this.cboName.DataSource=li;
				this.cboName.DisplayMember="Name";
				this.cboName.ValueMember="Code";
			}
			catch(SqlException ex)
			{
				MessageBox.Show("系统发生一个异常的错误！请与管理员联系。\n"+ex.Message,"系统错误",MessageBoxButtons.OK,MessageBoxIcon.Error);;
			}
			catch(Exception ex)
			{
				MessageBox.Show("数据库操作发生一个异常的错误！请与管理员联系。\n"+ex.Message,"系统错误",MessageBoxButtons.OK,MessageBoxIcon.Error);
			}
			finally
			{
				this.conLogin.Close();
			}
		}

		private void btnConfirm_Click(object sender, System.EventArgs e)
		{
			if(this.cboName.SelectedItem==null)
			{
				return;
			}
			else
			{
				try
				{
					this.conLogin=new System.Data.SqlClient.SqlConnection("server=.;uid=sa;pwd=;database=dbCarsys");
					this.conLogin.Open();
					string str="select uJob from tblUser where uCode='"+(string)this.cboName.SelectedValue+"' and uPwd='"+this.txtPwd.Text+"'";
					this.cmdLogin=new System.Data.SqlClient.SqlCommand(str,this.conLogin);
					string job=(string)this.cmdLogin.ExecuteScalar();
					if(job==null)
					{
						MessageBox.Show("登陆失败！","错误",MessageBoxButtons.OK,MessageBoxIcon.Warning);
						this.DialogResult=DialogResult.Cancel;
						return;
					}
					
//					MdiFrm_Main main=new MdiFrm_Main(this);
					MdiFrm_Main.islog=true;
					MdiFrm_Main.UserID=(string)this.cboName.SelectedValue;
					MdiFrm_Main.UserName=this.cboName.Text;
					MdiFrm_Main.UserJob=job;
//					main.Show();
					this.Close();
					this.DialogResult=DialogResult.OK;
				}
				catch(SqlException ex)
				{
					MessageBox.Show("数据库操作发生一个异常的错误！请与管理员联系。\n"+ex.Message,"系统错误",MessageBoxButtons.OK,MessageBoxIcon.Error);
				}
				catch(Exception ex)
				{
					MessageBox.Show("系统发生一个异常的错误！请与管理员联系。\n"+ex.Message,"系统错误",MessageBoxButtons.OK,MessageBoxIcon.Error);
				}
				finally
				{
					this.conLogin.Close();
					isExit=false;
				}
			}
		}
		bool isExit=false;
		private void btnCancel_Click(object sender, System.EventArgs e)
		{
			MdiFrm_Main.islog=false;
			this.Close();
			this.DialogResult=DialogResult.Cancel;
//			isExit=true;
//			this.Close();
			//Application.Exit();
		}
		
		private class User
		{
			 string code;
			 string name;

			public User(string code,string name)
			{
				this.code=code;
				this.name=name;
			}

			public string Code
			{
				get
				{
					return this.code;
				}
			}

			public string Name
			{
				get
				{
					return this.name;
				}
			}
		}
	}
	
}