studentaddclass.ascx.cs

电子选课系统 电子选课系统电子选课系统电子选课系统

namespace Park.StudentSystem
{
	using System;
	using System.Data;
	using System.Data.SqlClient;
	using System.Drawing;
	using System.Web;
	using System.Web.UI.WebControls;
	using System.Web.UI.HtmlControls;
	using Park.Common;

	/// <summary>
	///		StudentAddClass 的摘要说明。
	/// </summary>
	public abstract class StudentAddClass : System.Web.UI.UserControl,IProcessable
	{
		protected Epico.Controls.List ClassList;

		private void Page_Load(object sender, System.EventArgs e)
		{
			initializeList();
		}
		public void Process()
		{
			if(!this.IsPostBack) return;
			int retval = StudentSystemDB.AddClass(((Park.MainPage)Page).UserName,getString(Request["ClassID"]));
			if(retval == 1) return;
			else if(retval == 0) Utils.Error(this.Page,"已选此课");
			else if(retval == 2) Utils.Error(this.Page,"人数过多");
			else if(retval == 3) Utils.Error(this.Page,"选课过多");
			else if(retval == 4) Utils.Error(this.Page,"选课过期");
		}

		private string getString(string val)
		{
			if ( val ==null ) return "";
			return val;
		}

		private void initializeList()
		{
			SqlConnection myConnection=Utils.GetConnection();

			SqlCommand myCommand = new SqlCommand("StudentSystem_Get_ClassList", myConnection);

			// Mark the Command as a SPROC
			myCommand.CommandType = CommandType.StoredProcedure;

			// Add Parameters to SPROC
			SqlParameter StudentID = new SqlParameter("@studentid", SqlDbType.NVarChar, 20);
			StudentID.Value = ((Park.MainPage)Page).UserName;
			myCommand.Parameters.Add(StudentID);
			// Execute the command
			myConnection.Open();

			SqlDataReader result =  myCommand.ExecuteReader();

			ClassList.DataSource = result;
			ClassList.Name = "ClassID";

			ClassList.TitleColumn="ClassName";
			ClassList.ValueColumn="ClassID";

			//必须先绑定
			ClassList.BindData();

			myCommand.Dispose();
			myConnection.Dispose();

		}
		#region Web Form Designer generated code
		override protected void OnInit(EventArgs e)
		{
			//
			// CODEGEN：该调用是 ASP.NET Web 窗体设计器所必需的。
			//
			InitializeComponent();
			base.OnInit(e);
		}
		
		///		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.Load += new System.EventHandler(this.Page_Load);

		}
		#endregion
	}
}