ADO.NET中异步处理的方式——函数回调方式

函数回调方式

用代码说明

在页面上放Gridview用于显示

使用函数回调法方式取出数据

using System.Data;
using System.Data.SqlClient;
using System.Configuration;

namespace AdoAsyncDB
{
    /// <summary>
    /// 函数回调法
    /// </summary>
    public partial class CallBackMehtod : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            GetCallBackData();
        }

        private void GetCallBackData()
        {
            SqlConnection DBCon;
            SqlCommand Command = new SqlCommand();
            IAsyncResult AsyncResult;

            DBCon = new SqlConnection();
            DBCon.ConnectionString = ConfigurationManager.ConnectionStrings["NorthWindDB"].ConnectionString;
            Command.CommandText = @"select top 20 companyName,contactName,city,postalCode from dbo.Customers";
            Command.CommandType = CommandType.Text;
            Command.Connection = DBCon;
            DBCon.Open();
            AsyncResult = Command.BeginExecuteReader(new AsyncCallback(CallBackMethod), Command);
            System.Threading.Thread.Sleep(1000);
            DBCon.Close();
        }

        public void CallBackMethod(IAsyncResult IResult)
        {
            SqlCommand Command = (SqlCommand)IResult.AsyncState;
            SqlDataReader OrdersReader = Command.EndExecuteReader(IResult);
            gvData.DataSource = OrdersReader;
            gvData.DataBind();
        }
    }
}

代码下载：AdoAsyncDB.rar

文章汇总：

ADO.NET中异步处理的方式——Poll方式

ADO.NET中异步处理的方式——Wait方式

ADO.NET中异步处理的方式——函数回调方式