程序代码一.页面异步调用
前台
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" Async="true" Trace="true" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>无标题页</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:Label ID="Label1" runat="server" Text="Label"></asp:Label><br />
<asp:Label ID="Label2" runat="server" Text="Label"></asp:Label><br />
<asp:TextBox ID="TextBox1" runat="server" ReadOnly="true" columns="80" rows="25" TextMode="MultiLine"></asp:TextBox><br />
<br />
</div>
</form>
</body>
</html>
后台：
using System;
using System.Data;
using System.Configuration;
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;
public partial class _Default : System.Web.UI.Page
{
//页面异步处理
System.Net.WebRequest myRequest = null; //获取网络资源
protected void Page_Load(object sender, EventArgs e)
{
BeginEventHandler bh = new BeginEventHandler(this.BeginGetAsyncData);
EndEventHandler eh = new EndEventHandler(this.EndGetAsyncData);
AddOnPreRenderCompleteAsync(bh, eh);
string address = "http://www.hao123.com";
myRequest = System.Net.WebRequest.Create(address);
}
IAsyncResult BeginGetAsyncData(Object src, EventArgs args, AsyncCallback cb, Object state)
{
Trace.Warn("BeginGetAsyncData is Called");
Label1.Text = "BeginGetAsyncData: thread #" + System.Threading.Thread.CurrentThread.GetHashCode();
return myRequest.BeginGetResponse(cb, state); //异步请求
}
void EndGetAsyncData(IAsyncResult ar)
{
Trace.Warn("EndGetAsyncData is Called");
Label2.Text = "EndGetAsyncData: thread #" + System.Threading.Thread.CurrentThread.GetHashCode();
System.Net.WebResponse myResponse = myRequest.EndGetResponse(ar); //获取请求结果
TextBox1.Text = new System.IO.StreamReader(myResponse.GetResponseStream()).ReadToEnd();
myResponse.Close();
}
}
前台
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" Async="true" Trace="true" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>无标题页</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:Label ID="Label1" runat="server" Text="Label"></asp:Label><br />
<asp:Label ID="Label2" runat="server" Text="Label"></asp:Label><br />
<asp:TextBox ID="TextBox1" runat="server" ReadOnly="true" columns="80" rows="25" TextMode="MultiLine"></asp:TextBox><br />
<br />
</div>
</form>
</body>
</html>
后台：
using System;
using System.Data;
using System.Configuration;
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;
public partial class _Default : System.Web.UI.Page
{
//页面异步处理
System.Net.WebRequest myRequest = null; //获取网络资源
protected void Page_Load(object sender, EventArgs e)
{
BeginEventHandler bh = new BeginEventHandler(this.BeginGetAsyncData);
EndEventHandler eh = new EndEventHandler(this.EndGetAsyncData);
AddOnPreRenderCompleteAsync(bh, eh);
string address = "http://www.hao123.com";
myRequest = System.Net.WebRequest.Create(address);
}
IAsyncResult BeginGetAsyncData(Object src, EventArgs args, AsyncCallback cb, Object state)
{
Trace.Warn("BeginGetAsyncData is Called");
Label1.Text = "BeginGetAsyncData: thread #" + System.Threading.Thread.CurrentThread.GetHashCode();
return myRequest.BeginGetResponse(cb, state); //异步请求
}
void EndGetAsyncData(IAsyncResult ar)
{
Trace.Warn("EndGetAsyncData is Called");
Label2.Text = "EndGetAsyncData: thread #" + System.Threading.Thread.CurrentThread.GetHashCode();
System.Net.WebResponse myResponse = myRequest.EndGetResponse(ar); //获取请求结果
TextBox1.Text = new System.IO.StreamReader(myResponse.GetResponseStream()).ReadToEnd();
myResponse.Close();
}
}
程序代码对比--页面同步调用
前台
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default2.aspx.cs" Inherits="Default2" Async="true"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>无标题页</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="Button" /><br />
<br />
<asp:TextBox ID="TextBox1" runat="server" TextMode="MultiLine" Height="521px" Width="566px"></asp:TextBox> </div>
</form>
</body>
</html>
后台
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;
public partial class Default2 : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void Button1_Click(object sender, EventArgs e)
{
System.Net.WebRequest wr = System.Net.WebRequest.Create("http://www.baidu.com");
System.Net.WebResponse wb2 = wr.GetResponse();
TextBox1.Text = new System.IO.StreamReader(wb2.GetResponseStream()).ReadToEnd();
}
}
前台
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default2.aspx.cs" Inherits="Default2" Async="true"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>无标题页</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="Button" /><br />
<br />
<asp:TextBox ID="TextBox1" runat="server" TextMode="MultiLine" Height="521px" Width="566px"></asp:TextBox> </div>
</form>
</body>
</html>
后台
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;
public partial class Default2 : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void Button1_Click(object sender, EventArgs e)
{
System.Net.WebRequest wr = System.Net.WebRequest.Create("http://www.baidu.com");
System.Net.WebResponse wb2 = wr.GetResponse();
TextBox1.Text = new System.IO.StreamReader(wb2.GetResponseStream()).ReadToEnd();
}
}