前面的Post有提到解决Web中表单重复提交的方法，实际上表单重复提交的问题不单是Asp.net，其它动态Page都有。让我们看下面的图示:
然后在刷新页面时经常看到提示框在IE中:
Google Chrome:
Firefox:
最简单的解决方法就是使用Post-Redirect-Get模式，就是Http-Post完后，马上做Redirect操作，接下来那个页面是Get。这时用户强制按F5刷新也没有用了。最终实现的效果图：
那在Asp.net MVC中如何去做呢，看下面简单View代码：
一个包含两个Input的表单:
Index Action 在这里做Get的操作, LoginVerify 在这里是Post的目标Action
[HttpPost]public ActionResult LoginVerify(string fusername, string fpassword){ return this.RedirectToAction("Index", "Security", new { fusername = fusername });} public ActionResult Index(string fusername){ ViewBag.UserName = fusername + " login success!"; return View();} 对应请求时的HTTP Request RAW是这样的: POST HTTP/1.1
Accept: text/html, application/xhtml+xml, */* Referer: Accept-Language: en-US,zh-CN;q=0.5 User-Agent: Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; WOW64; Trident/5.0) Content-Type: application/x-www-form-urlencoded Accept-Encoding: gzip, deflate Host: localhost:91 Content-Length: 71 Connection: Keep-Alive Pragma: no-cache Cookie: ASP.NET_SessionId=qwwlp4rmjnzbsq3ob4dmcg3q
Http Response RAW:
HTTP/1.1 302 Found
Cache-Control: private Content-Type: text/html; charset=utf-8 Location: /Security?fusername=admin Server: Microsoft-IIS/7.5 X-AspNetMvc-Version: 3.0 X-AspNet-Version: 4.0.30319 X-Powered-By: ASP.NET Date: Sat, 24 Mar 2012 02:54:26 GMT Content-Length: 142<html><head><title>Object moved</title></head><body>
<h2>Object moved to <a href="/Security?fusername=admin">here</a>.</h2> </body></html>
在现在大多数的Web应用程序中都使用是Http 302的重定向。Http 1.1说明书中引用就是用来应对这种用户提交表单后可以在浏览器安全的刷新场景。 HTTP 303 意义是这样的：
Used to tell the client that the resource should be fetched using a different URL. This
new URL is in the Location header of the response message. Its main purpose is to allow responses to POST requests to direct a client to a resource.
在Asp.net MVC可以这些去实现一个自定义ActionResult:
////// SeeOtherRedirectResult/// public class SeeOtherRedirectResult : ActionResult{ private string _url; ////// Initializes a new instance of the /// Target URL. public SeeOtherRedirectResult(string url) { _url = url; } ///class. /// /// Enables processing of the result of an action method by a custom type that inherits from the /// The context in which the result is executed. The context information includes the controller, HTTP content, request context, and route data. public override void ExecuteResult(ControllerContext context) { context.HttpContext.Response.StatusCode = 303; context.HttpContext.Response.RedirectLocation = _url; }}class. ///
然后Action中使用它，来实现Http 303的重定向。：
[HttpPost]public ActionResult LoginVerify(string fusername, string fpassword){ return new SeeOtherRedirectResult(Url.Action("Index", "Security", new { fusername = fusername }));} 运行时，我们来看Http Response RAW:
HTTP/1.1 303 See Other
Cache-Control: private Location: /Security?fusername=admin Server: Microsoft-IIS/7.5 X-AspNetMvc-Version: 3.0 X-AspNet-Version: 4.0.30319 X-Powered-By: ASP.NET Date: Sat, 24 Mar 2012 03:05:37 GMT Content-Length: 0
完了，希望对您Web开发有帮助。如有任何问题请留言!
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