frmusermanagement.cs

本论文叙述了联机考试系统的现状以及C#语言的概况。重点介绍了联机考试系统的实现过程：包括系统分析、 系统调查、 数据流程分析、功能设计、 数据库设计、 系统物理配置方案、 系统实现、 系统测试和调试。

		private void btnSearch_Click(object sender, System.EventArgs e)
		{
			//calling the method ClearDetails
			this.ClearDetails();

			//if the Employee Name is not null -
			// store the value of the textfield to searchValue[0]
			if(this.txtEName.Text!="")
			{
				searchValue[0] =  this.txtEName.Text;
			}
			else
			{
				//if the textfield is null, make searchValue[0] to null
				searchValue[0] =  "";
			}
			//if the ComboBox fields is not null -
			// store the value of the ComboBox to searchValue[1]
			if(this.cboUId.Text!="")
			{
				searchValue[1] =  this.cboUId.Text;
			}
			else
			{
				//if the combobox is null, make searchValue[1] to null
				searchValue[1] =  "";
			}
			//if the CheckBox field is checked -
			// store the value true to searchValue[2]
			if(this.chkEStat.Checked)
			{
				searchValue[2] =  true.ToString();
			}
			else
			{
				//if the checkbox is unchecked store false to searchValue[2]
				searchValue[2] =  false.ToString();
			}

				
			UserManagement UAdminMgmt = new UserManagement();
			dtab = new DataTable("Employees");

			//Calling the FetchEmployeeDetails method of the Usermanagement class -
			//and passing the searchValue to it
			dtab = UAdminMgmt.FetchEmployeeDetails(searchValue);

			//Setting the Data Grid's datasource to dtab
			this.dbgDispEmp.DataSource = dtab;
				
			//Checking if the Data Grid has atleast one row 
			if(this.dbgDispEmp.CurrentRowIndex > -1)
			{
				this.dbgDispEmp.Enabled = true;
				this.btnPrint.Enabled =true; 
                this.btnPrintPreview.Enabled =true; 
				//Calling the method HidePWDColumninDG to hide the password field in Data Grid
				this.HidePWDColumninDG();
			}
			else
			{
				MessageBox.Show("未找到任何记录");
			}
		}

		private void btnExit_Click(object sender, System.EventArgs e)
		{
			frmMainMenu.varUsrMgmt = 0;
			this.Close();
//			frmMainMenu.mainMenuctr = 0;
		}

		//Method to hide the Password field in the Data Grid
		private void HidePWDColumninDG()
		{
			//DataGridTextBoxColumn dcol = new DataGridTextBoxColumn();

			//If already Existing , then remove
			if(this.dbgDispEmp.TableStyles.Count >0)
			{
				this.dbgDispEmp.TableStyles.RemoveAt(0);
		
			}

			DataGridTableStyle ts = new DataGridTableStyle();
						
			ts.MappingName = dtab.TableName;
			this.dbgDispEmp.DataSource = dtab;
			//Adding the TableSTyle to the DataGrid
			this.dbgDispEmp.TableStyles.Add(ts);

			this.dbgDispEmp.TableStyles[0].GridColumnStyles[1].Width = 0;

		}

		//Data Grid Double Click
		private void dbgDispEmp_DoubleClick(object sender, System.EventArgs e)
		{
			this.grpUsrDet.Enabled = true;
			this.txtUsrId.Enabled = false;
			this.txtPwd.Enabled = false;
			this.btnUpdate.Enabled = true;
			this.btnPwd.Enabled = true;
			this.btnNew.Enabled = false;
			this.btnSearch.Enabled = false;
			this.btnPrint.Enabled = true;
			

			this.pwdStat = true;

			int prval = 0;
			int ctr = 0;

			//Data Grid's first Column value is storing the text field txtUsrId
			this.txtUsrId.Text = this.dbgDispEmp[this.dbgDispEmp.CurrentRowIndex,0].ToString();
			//Data Grid's second Column value is storing the text field txtPwd
			this.txtPwd.Text = this.dbgDispEmp[this.dbgDispEmp.CurrentRowIndex,1].ToString();
			//Data Grid's third Column value is storing the variable prval
			prval = Convert.ToInt32(this.dbgDispEmp[this.dbgDispEmp.CurrentRowIndex,2]);
             
			this.ClearPriorities();
			//Binary Conversion for Priority Field
			while(prval !=0)
			{
				if((prval % 2) == 1)
				{
					this.chlPrior.SetItemChecked(ctr,true);
				}
				prval = prval/2;
				ctr++;
			}
			//Data Grid's fourth Column value is storing the text field txtEmpName
			this.txtEmpName.Text = this.dbgDispEmp[this.dbgDispEmp.CurrentRowIndex,3].ToString();
			//Data Grid's fifth Column value is storing the Check Box chkEmpStat
			this.chkEmpStat.Checked = Convert.ToBoolean(this.dbgDispEmp[this.dbgDispEmp.CurrentRowIndex,4].ToString());
			//Data Grid's sixth Column value is storing the text field txtEmailId
			this.txtEmailId.Text = this.dbgDispEmp[this.dbgDispEmp.CurrentRowIndex,5].ToString();
		}

		//Clicking on the PassWord Button
		private void btnPwd_Click(object sender, System.EventArgs e)
		{
			//Creating an object of frmChangePassword class and passing the values
			// UserId and Password to the constructor function
			frmChangePassword fcpd = new frmChangePassword(this.txtUsrId.Text,this.txtPwd.Text);
			fcpd.ShowDialog();
			
			this.txtPwd.Text = fcpd.password;
			//After changing the password refreshing the datagrid
			
			//btnSearch_Click(sender,e);
			this.btnPwd.Enabled = true;
			this.btnPrint.Enabled = false;
			this.btnNew.Enabled = false;
			this.btnSearch.Enabled = true;
			this.txtUsrId.Enabled = false;
			this.txtPwd.Enabled = false;
			
		}

		private void chlPrior_Leave(object sender, System.EventArgs e)
		{
			if (this.pwdStat == false)
				this.txtPwd.Enabled = true;
			else
				this.txtPwd.Enabled = false;
		}

		private void chkEmpStat_CheckedChanged(object sender, System.EventArgs e)
		{
			//Storing the current status of the CheckBox to the variable EmpStatus
			this.EmpStatus = this.chkEmpStat.Checked;
		}
	
		private void txtEmailId_Validated(object sender, System.EventArgs e)
		{
			// If all conditions have been met, clear the ErrorProvider of errors.
			errEmp.SetError(txtEmailId, "");
		}

		private void txtEmailId_Validating(object sender, System.ComponentModel.CancelEventArgs e)
		{
			
			frmNewUser f = new frmNewUser();
			
			if(! f.ValidEmailAddress(this.txtEmailId.Text, out errorMsg))
			{
				// Cancel the event and select the text to be corrected by the user.
				e.Cancel = true;
				txtEmailId.Select(0, txtEmailId.Text.Length);

				// Set the ErrorProvider error with the text to display. 
				this.errEmp.SetError(txtEmailId, errorMsg);
			}
		}

		

		private void frmUserManagement_Closing(object sender, System.ComponentModel.CancelEventArgs e)
		{
			frmMainMenu.varUsrMgmt = 0;
		}

		private void txtEName_MouseHover(object sender, System.EventArgs e)
		{
this.tipUsrMgmt.SetToolTip(this.txtEName,"选择一个员工姓名用来搜索...(可选)");	
		}

		private void cboUId_MouseHover(object sender, System.EventArgs e)
		{
			this.tipUsrMgmt.SetToolTip(this.cboUId ,"选择一个用户标识用来搜索...(可选)");	
		
		}

		private void chkEStat_MouseHover(object sender, System.EventArgs e)
		{
			this.tipUsrMgmt.SetToolTip(this.chkEStat, "选择一个状态用来搜索...(可选)");	
		
		}

		private void txtUsrId_MouseHover(object sender, System.EventArgs e)
		{
			this.tipUsrMgmt.SetToolTip(this.txtEName,"输入用户标识");	

		}

		private void txtEmpName_MouseHover(object sender, System.EventArgs e)
		{
			this.tipUsrMgmt.SetToolTip(this.txtEName,"输入员工姓名");	

		}

		private void chlPrior_MouseHover(object sender, System.EventArgs e)
		{
	 this.tipUsrMgmt.SetToolTip(this.chlPrior,"输入员工优先级");	
		}

		private void txtPwd_MouseHover(object sender, System.EventArgs e)
		{
			this.tipUsrMgmt.SetToolTip(this.txtPwd,"输入密码");		
		}

		private void txtEmailId_MouseHover(object sender, System.EventArgs e)
		{
			this.tipUsrMgmt.SetToolTip(this.txtEmailId,"输入电子邮件地址");	
		
		}

		private void btnNew_MouseHover(object sender, System.EventArgs e)
		{
			this.tipUsrMgmt.SetToolTip(this.btnNew,"添加记录");	
		
		}

		private void btnUpdate_MouseHover(object sender, System.EventArgs e)
		{
			this.tipUsrMgmt.SetToolTip(this.btnUpdate,"更新记录");	
		
		}

		private void btnPrint_MouseHover(object sender, System.EventArgs e)
		{
			this.tipUsrMgmt.SetToolTip(this.btnPrint,"打印搜索结果");	
		
		}

		private void pDocUser_PrintPage(object sender, System.Drawing.Printing.PrintPageEventArgs e)
		{
			Graphics	g = e.Graphics;
			DrawTopLabel(g);
			bool more = dataGridPrinter.DrawDataGrid(g);
			if (more == true)
			{
				e.HasMorePages = true;
				dataGridPrinter.PageNumber++;
			}
		}				
		void DrawTopLabel(Graphics g)
		{
			int TopMargin = pDocUser.DefaultPageSettings.Margins.Top;
			lblHeading.Text ="用户信息";
			g.FillRectangle(new SolidBrush(lblHeading.BackColor), lblHeading.Location.X, lblHeading.Location.Y + TopMargin, lblHeading.Size.Width+100, lblHeading.Size.Height);
			g.DrawString(lblHeading.Text, lblHeading.Font, new SolidBrush(lblHeading.ForeColor), lblHeading.Location.X + 50, lblHeading.Location.Y + TopMargin, new StringFormat());
		}

		private void btnPrint_Click(object sender, System.EventArgs e)
		{
			try
			{
				DataTable dt=(DataTable)this.dbgDispEmp.DataSource; 

				dataGridPrinter = new DataGridPrinter(this.dbgDispEmp, pDocUser,dt);
				dataGridPrinter.PageNumber = 1;
				dataGridPrinter.RowCount = 0;
				if (pdlgUser.ShowDialog() == DialogResult.OK)
				{
					pDocUser.Print();
				}
			}
			catch(Exception excep)
			{
				MessageBox.Show("打印机设置不正确或者未安装。" +excep.Message.ToString());
			}
		}

		private void btnPrintPreview_Click(object sender, System.EventArgs e)
		{
			DataTable dt=(DataTable)this.dbgDispEmp.DataSource; 

			dataGridPrinter = new DataGridPrinter(this.dbgDispEmp, pDocUser,dt);
			dataGridPrinter.PageNumber = 1;
			dataGridPrinter.RowCount = 0;
		    this.ppdlgUser.ShowDialog();
		}

		
	
	}
}