Response.Rederect在默认情况下是在本页跳转,所以除了在js中用window.open或是给A标签添加target属性之外,在后台似乎不能来打开新的页面,其实不然,通过设置form的target属性同样可以让Response.Rederect所指向的url在新的窗口打开。下面用三种方法来实现。 

1 .给form指定target属性,那么本页面中所有的Response.Rederect都将在新的窗口中打开。代码如下: 
protected void Page_Load(object sender, EventArgs e) 

form1.Target = "_blank"; 

或 
<form id="form2" runat="server" target="_blank"> 

2 .用脚本针对某个控件来指定form的target,代码如下: 

html代码: 

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="ResponseRedirectDemo._Default" %> 

<!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 id="Head1" runat="server"> 
<title>ResponseRedirectDemo</title> 
</head> 
<body> 
<form id="form2" runat="server" target="_blank"> 
<div> 
<asp:Button ID="Button1" runat="server" OnClick="Button1_Click" 
Text="OpenNewWindow"/> 
<asp:Button ID="Button2" runat="server" OnClick="Button2_Click" 
Text="OpenOldWindow" /> 
</div> 
</form> 
</body> 
</html> 

C#代码: 
[code] 
namespace ResponseRedirectDemo 

public partial class _Default : System.Web.UI.Page 

protected void Page_Load(object sender, EventArgs e) 

Button1.Attributes.Add("onclick", "this.form.target='_blank'"); 
Button2.Attributes.Add("onclick", "this.form.target=''"); 


protected void Button1_Click(object sender, EventArgs e) 

Response.Redirect("http://oec2003.cnblogs.com"); 


protected void Button2_Click(object sender, EventArgs e) 

Response.Redirect("http://oec2003.cnblogs.com"); 


上面的代码中点击button1在新窗口打开,点击button2在本页打开。 

3 .除了设置form的target属性,要在新的窗口打开页面就只能用open,可以写个通用的方法来实现,如下:

public class RedirectHelper 

public static void Redirect(string url, 
string target, string windowFeatures) 

HttpContext context = HttpContext.Current; 
if ((String.IsNullOrEmpty(target) || 
target.Equals("_self", StringComparison.OrdinalIgnoreCase)) && 
String.IsNullOrEmpty(windowFeatures)) 

context.Response.Redirect(url); 

else 

Page page = (Page)context.Handler; 
if (page == null) 

throw new 
InvalidOperationException("Cannot redirect to new window."); 

url = page.ResolveClientUrl(url); 
string script; 
if (!String.IsNullOrEmpty(windowFeatures)) 

script = @"window.open(""{0}"", ""{1}"", ""{2}"");"; 

else 

script = @"window.open(""{0}"", ""{1}"");"; 

script = String.Format(script, url, target, windowFeatures); 
page.ClientScript.RegisterStartupScript(page.GetType(), 
"Redirect", script, true); 
} } } 

这样就可以在程序中使用RedirectHelper.Redirect("oec2003.aspx", "_blank", "");第三个参数为open窗口的一些属性。但这样好像还不是很方便,在.net3.5中提供了扩展方法的特性,在这里也可以借用一下,将上面的静态方法实现为Response.Redirect的一个重载。具体代码如下: 

public static class RedirectHelper 

public static void Redirect(this HttpResponse response, 
string url, string target, string windowFeatures) 

if ((String.IsNullOrEmpty(target) || 
target.Equals("_self", StringComparison.OrdinalIgnoreCase)) && 
String.IsNullOrEmpty(windowFeatures)) 

response.Redirect(url); 

else 

Page page = (Page)HttpContext.Current.Handler; if (page == null) 

throw new 
InvalidOperationException("Cannot redirect to new window ."); 

url = page.ResolveClientUrl(url); 
string script; 
if (!String.IsNullOrEmpty(windowFeatures)) 

script = @"window.open(""{0}"", ""{1}"", ""{2}"");"; 

else 

script = @"window.open(""{0}"", ""{1}"");"; 

script = String.Format(script, url, target, windowFeatures); 
ScriptManager.RegisterStartupScript(page, 
typeof(Page), "Redirect", script, true); 


将该类添加到项目中后,在程序中输入Response.Redirect会发现该方法有三个重载了,这样再结合前面的form的target 就非常方便了。 

另外: 

Respose.Write("<script language='javascript'>window.open('"+ url +"');</script>"); (打开简洁窗口): 
Respose.Write("<script language='javascript'>window.open('" + url + "','','resizable=1,scrollbars=0,status=1,menubar=no,toolbar=no,location=no, menu=no');</script>"); 

1. Response.Redirect("XXX.aspx",true)——直接转向新的页面,原窗口被代替; 
2. Response.Write("<script>window.open('XXX.aspx','_blank')</script>")——原窗口保留,另外新增一个新页面; 
3. Response.Write("<script>window.location='XXX.aspx'</script>")——打开新的页面,原窗口被代替; 
4. Server.Transfer("XXX.aspx")——打开新的页面; 
5. Response.Write("<script>window.showModelessDialog('XXX.aspx')</script>")——原窗口保留,以对话框形式打开新窗口; 
6. Response.Write("<script>window.showModelDialog('XXX.aspx')</script>")——对话框形式打开新窗口,原窗口被代替;