updategrade.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.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;

public partial class DesktopModules_Grade_UpdateGrade : System.Web.UI.Page
{
    int nGradeID = -1;
    protected void Page_Load(object sender, EventArgs e)
    {
        ///获取ID的值
        if (Request.Params["GradeID"] != null)
        {
            nGradeID = Int32.Parse(Request.Params["GradeID"].ToString());
        }

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

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

    private void BindYearData()
    {
        ///为年列表添加40个数据项
        YearDateList.Items.Clear();
        for (int i = 0; i < 40; i++)
        {
            YearDateList.Items.Add(new ListItem((1991 + i).ToString()));
        }
    }

    private void BindGradeData(int nGradeID)
    {
        ///获取数据
        GradeM grade = new GradeM();
        Grade recg = grade.GetSingleGrade(nGradeID);

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

            ASPNET35System.SetListBoxItem(YearDateList, recg.YearDate.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
           GradeM grade = new GradeM();
            try
            {
                ///修改
                grade.UpdateGrade(nGradeID, Desn.Text.Trim(),
                    Int32.Parse(YearDateList.SelectedItem.Text),
                    Int32.Parse(Semester.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/Grade/GradeManage.aspx");
    }	
}