updateclass.aspx.cs

精通网络应用系统开发 光盘 该书是人民邮电出版社出版的

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;
using System.Data.Linq;
using System.Collections.Generic;

public partial class UpdateClass : System.Web.UI.Page
{
	int nClassID = -1;

	protected void Page_Load(object sender,EventArgs e)
	{
		///获取ID的值
		if (Request.Params["ClassID"] != null)
		{
			nClassID = Int32.Parse(Request.Params["ClassID"].ToString());
		}

		if (!Page.IsPostBack)
		{
			///绑定控件的数据
			BindGradeData();
			BindTeacherData();
			if (nClassID > -1)
			{
				BindClassData(nClassID);
			}
		}

		///设置按钮的可用性
		UpdateBtn.Enabled = GradeList.Items.Count > 0 && TeacherList.Items.Count > 0
			&& nClassID >= 0 ? true : false;
	}

	private void BindGradeData()
	{
		///定义获取数据的类
		GradeM grade = new GradeM();
		Table<Grade> rect = grade.GetGrades();

		///设定控件的数据源
		GradeList.DataSource = rect;

		///设定控件的Text属性和Value属性
		GradeList.DataTextField = "Desn";
		GradeList.DataValueField = "GradeID";

		///绑定控件的数据
		GradeList.DataBind();
	}

	private void BindTeacherData()
	{
		///定义获取数据的类
		TeacherM teacher = new TeacherM();
		Table<Teacher> rect = teacher.GetTeachers();

		///设定控件的数据源
		TeacherList.DataSource = rect;

		///设定控件的Text属性和Value属性
		TeacherList.DataTextField = "Name";
		TeacherList.DataValueField = "TeacherID";

		///绑定控件的数据
		TeacherList.DataBind();
	}

	private void BindClassData(int nClassID)
	{
		///获取数据
		ClassM grade = new ClassM();
		Class recg = grade.GetSingleClass(nClassID);

		///读取数据
		if (recg!=null)
		{
			///显示数据
			Desn.Text = recg.Desn;
			StartDate.Text = recg.StartDate.ToString();
			EndDate.Text = recg.EndDate.ToString();
			StuNum.Text = recg.StuNum.ToString();

			ASPNET35System.SetListBoxItem(TeacherList,recg.TeacherID.ToString());
			ASPNET35System.SetListBoxItem(GradeList,recg.GradeID.ToString());
		}
	}

	protected void UpdateBtn_Click(object sender,EventArgs e)
	{
		///如果页面输入内容合法
		if (Page.IsValid == true)
		{
			///定义类
			ClassM grade = new ClassM();
			try
			{
				///修改
				grade.UpdateClass(nClassID,Desn.Text.Trim(),Int32.Parse(GradeList.SelectedValue),
					Int32.Parse(TeacherList.SelectedValue),DateTime.Parse(StartDate.Text.Trim()),
					DateTime.Parse(EndDate.Text.Trim()),Int32.Parse(StuNum.Text.Trim()));


				///显示操作结果信息
				Response.Write("<script>window.alert('" + ASPNET35System.OPERATIONUPDATESUCCESSMESSAGE + "')</script>");
			}
			catch (Exception ex)
			{
				///显示修改操作中的失败、错误信息
				Response.Redirect("~/DesktopModules/ErrorPage.aspx?ErrorUrl="
					+ ASPNET35System.RedirectErrorUrl(Request.RawUrl)
					+ "&ErrorMessage=" + ex.Message.Replace("\n"," "));
			}
		}
	}

	protected void ReturnBtn_Click(object sender,EventArgs e)
	{
		///返回管理页面
		Response.Redirect("~/DesktopModules/Class/ClassManage.aspx");
	}	
}