login.cs

工资管理系统

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

namespace HrSalary.user
{
	/// <summary>
	/// login 的摘要说明。
	/// </summary>
	public class login : System.Windows.Forms.Form
	{
		public int loginflag=0;
		public string displaystyle="";
		private System.Windows.Forms.Label label1;
		private System.Windows.Forms.ComboBox comboBox1;
		private System.Windows.Forms.Label label3;
		private System.Windows.Forms.TextBox textBox1;
		private System.Windows.Forms.Button button1;
		private System.Windows.Forms.Button button2;
		/// <summary>
		/// 必需的设计器变量。
		/// </summary>
		private System.ComponentModel.Container components = null;
		private System.Windows.Forms.ColorDialog colorDialog1;
		private System.Windows.Forms.Label label2;
		private OleDbConnection dbCon = null;
		public login()
		{
			//
			// 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.label1 = new System.Windows.Forms.Label();
			this.comboBox1 = new System.Windows.Forms.ComboBox();
			this.label3 = new System.Windows.Forms.Label();
			this.textBox1 = new System.Windows.Forms.TextBox();
			this.button1 = new System.Windows.Forms.Button();
			this.button2 = new System.Windows.Forms.Button();
			this.colorDialog1 = new System.Windows.Forms.ColorDialog();
			this.label2 = new System.Windows.Forms.Label();
			this.SuspendLayout();
			// 
			// label1
			// 
			this.label1.BackColor = System.Drawing.Color.Transparent;
			this.label1.Font = new System.Drawing.Font("华文行楷", 21.75F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));
			this.label1.ForeColor = System.Drawing.Color.Blue;
			this.label1.Location = new System.Drawing.Point(24, 16);
			this.label1.Name = "label1";
			this.label1.Size = new System.Drawing.Size(256, 32);
			this.label1.TabIndex = 0;
			this.label1.Text = "Hr工资管理系统";
			// 
			// comboBox1
			// 
			this.comboBox1.DropDownStyle = System.Windows.Forms.ComboBoxStyle.DropDownList;
			this.comboBox1.Location = new System.Drawing.Point(88, 72);
			this.comboBox1.MaxDropDownItems = 5;
			this.comboBox1.Name = "comboBox1";
			this.comboBox1.Size = new System.Drawing.Size(121, 20);
			this.comboBox1.TabIndex = 1;
			// 
			// label3
			// 
			this.label3.BackColor = System.Drawing.Color.Transparent;
			this.label3.Font = new System.Drawing.Font("宋体", 12F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));
			this.label3.ForeColor = System.Drawing.Color.Blue;
			this.label3.Location = new System.Drawing.Point(40, 112);
			this.label3.Name = "label3";
			this.label3.Size = new System.Drawing.Size(56, 23);
			this.label3.TabIndex = 3;
			this.label3.Text = "密码";
			// 
			// textBox1
			// 
			this.textBox1.Location = new System.Drawing.Point(88, 104);
			this.textBox1.Name = "textBox1";
			this.textBox1.PasswordChar = '*';
			this.textBox1.Size = new System.Drawing.Size(120, 21);
			this.textBox1.TabIndex = 4;
			this.textBox1.Text = "";
			// 
			// button1
			// 
			this.button1.BackColor = System.Drawing.Color.Transparent;
			this.button1.ForeColor = System.Drawing.Color.Blue;
			this.button1.Location = new System.Drawing.Point(48, 144);
			this.button1.Name = "button1";
			this.button1.Size = new System.Drawing.Size(80, 24);
			this.button1.TabIndex = 5;
			this.button1.Text = "登陆";
			this.button1.Click += new System.EventHandler(this.button1_Click);
			// 
			// button2
			// 
			this.button2.BackColor = System.Drawing.Color.Transparent;
			this.button2.ForeColor = System.Drawing.Color.Blue;
			this.button2.Location = new System.Drawing.Point(136, 144);
			this.button2.Name = "button2";
			this.button2.Size = new System.Drawing.Size(80, 24);
			this.button2.TabIndex = 6;
			this.button2.Text = "取消";
			this.button2.Click += new System.EventHandler(this.button2_Click);
			// 
			// label2
			// 
			this.label2.BackColor = System.Drawing.Color.Transparent;
			this.label2.Font = new System.Drawing.Font("宋体", 12F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));
			this.label2.ForeColor = System.Drawing.Color.Blue;
			this.label2.Location = new System.Drawing.Point(40, 72);
			this.label2.Name = "label2";
			this.label2.Size = new System.Drawing.Size(56, 23);
			this.label2.TabIndex = 2;
			this.label2.Text = "用户";
			// 
			// login
			// 
			this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
			this.BackColor = System.Drawing.Color.AliceBlue;
			this.ClientSize = new System.Drawing.Size(264, 181);
			this.Controls.Add(this.button2);
			this.Controls.Add(this.button1);
			this.Controls.Add(this.textBox1);
			this.Controls.Add(this.label3);
			this.Controls.Add(this.comboBox1);
			this.Controls.Add(this.label1);
			this.Controls.Add(this.label2);
			this.ForeColor = System.Drawing.SystemColors.InfoText;
			this.Name = "login";
			this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;
			this.Text = "登陆";
			this.Load += new System.EventHandler(this.login_load);
			this.ResumeLayout(false);

		}
		#endregion

		private void login_load(object sender, System.EventArgs e)
		{
			
			if(dbCon==null) dbCon = MainForm.getConnection();
			OleDbCommand cmd = dbCon.CreateCommand();
			cmd.CommandText = "select name from a_user";
			//取出系统的所有用户名
			//显示在下拉列表,这样用户登录的时候
			//选择用户名就可以了,不用再输入用户名了
			OleDbDataReader reader = cmd.ExecuteReader();
			int flag = 0;
			while(reader.Read())
			{
				this.comboBox1.Items.Add(reader.GetString(0));
				flag++;
			}
			if(flag>0)//如果系统存在用户,则默认选中第一个用户
				this.comboBox1.SelectedIndex = 0;			
			reader.Close();
			cmd.Dispose();	
		}

        //单击[登录]按钮的事件处理
		private void button1_Click(object sender, System.EventArgs e)
		{
			try
			{
				string sql="select passwd,staff,salary  from a_user where name='"+this.comboBox1.Text +"'";
		    	if(dbCon==null) dbCon = MainForm.getConnection();
				OleDbCommand cmd = dbCon.CreateCommand();
				cmd.CommandText =sql; 				
				OleDbDataReader reader = cmd.ExecuteReader();				
				if(!reader.Read())
				{
					MessageBox.Show("无此用户，请重试！");
					reader.Close();
					cmd.Dispose();
					return;
				}
				else
				{	
					if(!reader.GetString(0).Equals (this.textBox1.Text.ToString()))
					{
						MessageBox.Show("\n密码错误，请重试！");
						reader.Close();
						cmd.Dispose();
						return;
					}					
					Menu mainmenu=((MainForm)(this.MdiParent)).getMainMenu();					
					if(reader.GetBoolean(1))
								mainmenu.MenuItems[1].Visible=true;
					mainmenu.MenuItems[0].Visible=true;
					mainmenu.MenuItems[2].Visible=true;
					
					
					if(this.comboBox1.Text.Equals("系统管理员"))
					{
                        mainmenu.MenuItems[3].Visible=true;
						for(int i=0;i<3;i++)
						mainmenu.MenuItems[3].MenuItems[i].Visible=true;						
					}
					else
					{
										
					}				
					reader.Close();
					cmd.Dispose();
					this.Close();
				}						
			}
			catch(Exception ee)
			{
				MessageBox.Show("\n"+ee.ToString());
			}
		}
        //单击取消按钮
		private void button2_Click(object sender, System.EventArgs e)
		{
			this.Close();
		}
	}
}