mydatareader.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.Configuration;
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;

namespace Example_5_2
{
	/// <summary>
	/// Summary description for MyDataReader.
	/// </summary>
	public class MyDataReader : System.Web.UI.Page
	{
		protected System.Web.UI.WebControls.Label ReaderLabel;
		private readonly string SQLCONNECTIONSTRING = ConfigurationSettings.AppSettings["SQLCONNECTIONSTRING"].ToString();
	
		private void Page_Load(object sender, System.EventArgs e)
		{
			if(!Page.IsPostBack)
			{
				///执行数据库查询，并使用SqlDataReader对象保存结果
				ReaderLabel.Text = FormatDataReader(ExecuteReader());
			}
		}

		#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.Load += new System.EventHandler(this.Page_Load);

		}
		#endregion

		private SqlDataReader ExecuteReader()
		{
			String cmdText = "SELECT Top 10 Staff_Name,RealName from Staff";
			SqlConnection myConnection = new SqlConnection(SQLCONNECTIONSTRING);
			SqlCommand myCommand = new SqlCommand(cmdText,myConnection);

			///执行数据库查询，并返回SqlDataReader对象
			myConnection.Open();
			SqlDataReader dr = myCommand.ExecuteReader(CommandBehavior.CloseConnection);			
	
			return(dr);
		}

		/// <summary>
		/// 格式化SqlDataReader对象中的数据
		/// </summary>
		private String FormatDataReader(SqlDataReader datareader)
		{
			///读取数据
			String readerString = "";
			while(datareader.Read())
			{
				readerString += "Staff_Name=" + datareader["Staff_Name"].ToString() + "　";
				readerString += "RealName=" + datareader["RealName"].ToString();
				readerString += "<br>";
			}
			///关闭读取器
			datareader.Close();

			return(readerString);
		}
	}
}