http://fredrik.nsquared2.com/viewpost.aspx?PostID=282&showfeedback=true
按原来的代码写了一下,又不用异步试了一下,感觉调用异步稍微快一点，不过不是很明显..
可能是调用异步时,webDev.WebServe 占用内存很大的缘故(不调用异步时占用很少...)。。。。
用过的朋友谈谈....
异步调用。。
注意设置 Async="true"
<%@ Page Language="C#" Async="true" AutoEventWireup="true" CodeFile="Default3.aspx.cs" Inherits="Default3" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd"><html xmlns="http://www.w3.org/1999/xhtml" ><head runat="server"> <title>Untitled Page</title></head><body> <form id="form1" runat="server"> <div> BeginInvoke Thread: <asp:Label ID="Label1" runat="server" Text="Label"></asp:Label><br /> EndInvoke Thtead: <asp:Label ID="Label2" runat="server" Text="Label"></asp:Label><br /> <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns=true> </asp:GridView> </div> </form></body></html>using System;using System.Data;using System.Configuration;using System.Collections;using System.Web;using System.Web.Security;using System.Web.UI;using System.Web.UI.WebControls;using System.Web.UI.WebControls.WebParts;using System.Web.UI.HtmlControls;using System.Data.SqlClient;public partial class Default3 : System.Web.UI.Page{
private SqlCommand _command; private SqlConnection _con; protected void Page_Load(object sender, EventArgs e)
{
PageAsyncTask task = new PageAsyncTask(BeginInvoke, EndInvoke, EndTimeOutInvoke, null); Page.RegisterAsyncTask(task);
} public IAsyncResult BeginInvoke(object sender, EventArgs e, AsyncCallback cb, object extraData) { this._con = new SqlConnection("Asynchronous Processing=true;Data Source=JKDL-PORTAL;Initial Catalog=Northwind;Persist Security Info=True;User ID=sa;Password=111"); string sProcName = "SELECT * FROM Customers"; for (int i = 0; i < 200; i++) { sProcName += " UNION ALL "; sProcName += " SELECT * FROM Customers "; } this._command = new SqlCommand(sProcName, this._con); Label1.Text = System.Threading.Thread.CurrentThread.GetHashCode().ToString(); this._con.Open(); return this._command.BeginExecuteReader(cb, extraData, CommandBehavior.CloseConnection); } public void EndInvoke(IAsyncResult result) { SqlDataReader reader = this._command.EndExecuteReader(result); if (reader != null && reader.HasRows) { GridView1.DataSource = reader; GridView1.DataBind(); } reader.Close(); Label2.Text = System.Threading.Thread.CurrentThread.GetHashCode().ToString(); } public void EndTimeOutInvoke(IAsyncResult result) { if (this._con != null && this._con.State != ConnectionState.Closed) this._con.Close(); Response.Write("TimeOut"); }
}非异步时
using System;using System.Data;using System.Configuration;using System.Collections;using System.Web;using System.Web.Security;using System.Web.UI;using System.Web.UI.WebControls;using System.Web.UI.WebControls.WebParts;using System.Web.UI.HtmlControls;using System.Data.SqlClient;public partial class Default6 : System.Web.UI.Page{ private SqlCommand _command; private SqlConnection _con; protected void Page_Load(object sender, EventArgs e) { this._con = new SqlConnection("Data Source=JKDL-PORTAL;Initial Catalog=Northwind;Persist Security Info=True;User ID=sa;Password=111"); string sProcName = "SELECT * FROM Customers"; for (int i = 0; i < 200; i++) { sProcName += " UNION ALL "; sProcName += " SELECT * FROM Customers "; } this._con.Open(); this._command = new SqlCommand(sProcName, this._con); this.GridView1.DataSource = this._command.ExecuteReader(); this.GridView1.DataBind(); }}