函数回调方式
用代码说明
在页面上放Gridview用于显示
<body>
<form id="form1" runat="server">
<div>
<asp:GridView ID="gvData" runat="server">
</asp:GridView>
</div>
</form>
</body>
<form id="form1" runat="server">
<div>
<asp:GridView ID="gvData" runat="server">
</asp:GridView>
</div>
</form>
</body>
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();
}
}
}
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();
}
}
}
