mydgsort.aspx.cs

ASP C#代码实例 适合初学人士学习使用

using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;
using System.Configuration;

namespace Example_9_3
{
	/// <summary>
	/// Summary description for MyDGSort.
	/// </summary>
	public class MyDGSort : System.Web.UI.Page
	{
		protected System.Web.UI.WebControls.DataGrid myDataGrid;
		protected System.Web.UI.WebControls.Label LabelSortString;
		private readonly string SQLCONNECTIONSTRING = ConfigurationSettings.AppSettings["SQLCONNECTIONSTRING"].ToString();

		private void Page_Load(object sender, System.EventArgs e)
		{
			if(!Page.IsPostBack)
			{
				///创建控件的数据源——DataView对象
				myDataGrid.DataSource = CreateDataSource();
				myDataGrid.DataBind();
			}
		}

		private DataView CreateDataSource()
		{
			///从数据库中获取表记录
			String cmdText = "SELECT TOP 10 Staff.*,Role.* FROM Staff "
				+ "INNER JOIN StaffRole ON Staff.Staff_ID = StaffRole.Staff_ID "
				+ "INNER JOIN Role ON Role.Role_ID = StaffRole.Role_ID "
				+ "ORDER BY Staff.Staff_ID DESC";		
			SqlConnection myConnection = new SqlConnection(SQLCONNECTIONSTRING);
			SqlCommand myCommand = new SqlCommand(cmdText,myConnection);

			///执行数据库查询
			myConnection.Open();
			SqlDataReader dr = myCommand.ExecuteReader();

			///创建DataTable对象
			DataTable dataTable = new DataTable();
			///添加新的数据列
			dataTable.Columns.Add("StaffID",typeof(int));
			dataTable.Columns.Add("StaffName",typeof(string));
			dataTable.Columns.Add("RealName",typeof(string));
			dataTable.Columns.Add("RoleID",typeof(int));
			dataTable.Columns.Add("RoleName",typeof(string));
			dataTable.Columns.Add("Birthday",typeof(DateTime));
			dataTable.Columns.Add("Email",typeof(string));

			///创建数据集DataSet对象
			DataSet dataSet = new DataSet();

			while(dr.Read())
			{
				///添加新的数据行
				DataRow row = dataTable.NewRow();
				row["StaffID"]   = dr["Staff_ID"].ToString();
				row["StaffName"] = dr["Staff_Name"].ToString();
				row["RealName"]  = dr["RealName"].ToString();
				row["RoleID"]    = dr["Role_ID"].ToString();
				row["RoleName"]  = dr["Role_Name"].ToString();
				row["Birthday"]  = dr["Birthday"].ToString();
				row["Email"]     = dr["Email"].ToString();

				dataTable.Rows.Add(row);
			}
			dr.Close();
			myConnection.Close();	

			///创建DataSet数据源
			dataSet.Tables.Add(dataTable);
			///返回数据源中数据表对应的视图
			return(dataSet.Tables[0].DefaultView);			
		}

		#region Web Form Designer generated code
		override protected void OnInit(EventArgs e)
		{
			//
			// CODEGEN: This call is required by the ASP.NET Web Form Designer.
			//
			InitializeComponent();
			base.OnInit(e);
		}
		
		/// <summary>
		/// Required method for Designer support - do not modify
		/// the contents of this method with the code editor.
		/// </summary>
		private void InitializeComponent()
		{    
			this.myDataGrid.SortCommand += new System.Web.UI.WebControls.DataGridSortCommandEventHandler(this.myDataGrid_SortCommand);
			this.Load += new System.EventHandler(this.Page_Load);

		}
		#endregion

		private void myDataGrid_SortCommand(object source, System.Web.UI.WebControls.DataGridSortCommandEventArgs e)
		{
			///获取数据源
			DataView mydataView = CreateDataSource();
			///设置数据源的排序表达式
			mydataView.Sort = e.SortExpression;
		    ///重新绑定控件的数据
			myDataGrid.DataSource = mydataView;
			myDataGrid.DataBind();

			///显示排序表达式
			LabelSortString.Text = "排序表达式为：" + e.SortExpression;
		}
	}
}