major.ascx.cs

学生成绩管理系统

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 TeachHelper.BusinessLogicLayer;
using TeachHelper.Comm;

public partial class TeachHelper_Controls_Major : System.Web.UI.UserControl
{
    int departmentId;
    int majorId;
    string majorName;

    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            this.DropDownListDepartment.DataBind();
            departmentId = Convert.ToInt32(this.DropDownListDepartment.SelectedValue.Trim());
            BindMajorByDepartmentId(); 
        }

        departmentId = Convert.ToInt32(this.DropDownListDepartment.SelectedValue.Trim());
        
    }

    protected void DropDownListDepartment_SelectedIndexChanged(object sender, EventArgs e)
    {
        BindMajorByDepartmentId();
    }

    protected void ButtonAdd_Click(object sender, EventArgs e)
    {
        majorName = this.TextBoxMajor.Text.Trim();
        try
        {
            Major.Add(majorName, departmentId);
        }
        catch (Exception ex)
        {
            MessageBox.Show(this.Page, ex.Message);
        }

        this.TextBoxMajor.Text = string.Empty;
        BindMajorByDepartmentId(); 
    }

    protected void ButtonDelete_Click(object sender, EventArgs e)
    {
        int index = this.ListBoxMajor.SelectedIndex;
        if (index == -1)
        {
            MessageBox.Show(this.Page, "请先选择一项删除");
            return;
        }
        else
        {
            majorId = Convert.ToInt32(this.ListBoxMajor.SelectedValue);
            try
            {
                Major.Delete(majorId);
                BindMajorByDepartmentId(); 
            }
            catch (Exception ex)
            {
                MessageBox.Show(this.Page, ex.Message);
            }
        }
    }

    private void BindMajorByDepartmentId()
    {        
        this.ListBoxMajor.DataSource = Major.GetCollectByDepartmentId(departmentId);
        this.ListBoxMajor.DataTextField = "Name";
        this.ListBoxMajor.DataValueField = "Id";
        this.ListBoxMajor.DataBind();
    }
}