Response.Redirect在新窗口打开 && 3.0扩展方法
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:
1 2 3 4
| protected void Page_Load(object sender, EventArgs e) { form1.Target = "_blank"; }
|
或
1
| <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:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21
| <%@ 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:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21
| 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:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37
| 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:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34
| 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。