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ASP.NET MVC应用系统软件架构基础入门

  1.2 Post-Redirect-Get防止刷新页面造成的重复提交数据

  在ASP.NET中要防止用户刷新页面,重复提交数据的话。需要在页面里面写JavaScript,而且要在后台c#代码中判断数据是否已经提交,才可以做到万无一失。

  在ASP.NET 的 MVC框架中要实现防止刷新页面非常的简单,就是利用上面介绍的TempData来实现的。TempData用来传递数据,支持跨action传递,但是只能第一次进入action的时候访问,后面再次访问的话,TempData中的数据就会丢失。就是利用了这一点,在提交页面将提交的内容放入TempData中,然后再成功的提示页面获取出来,如果TempData["Data"]=null的话,就说明是用户在刷新页面,可以跳转到其他view或者做个提示。

  具体代码如下:

  实体

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;

namespace Mvc3EmptyApp.Models.Entities
{
    
public class GuestBook
    {
        
public string Name { get; set; }
        
public string Email { get; set; }
        
public string Comments { get; set; }
    }
}

 

 

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;

namespace Mvc3EmptyApp.Controllers
{
    
public class GuestBookController : Controller
    {
        
//
        
// GET: /GuestBook/

        
public ActionResult Index()
        {
            var entity
= new Models.Entities.GuestBook();
            return View(entity );
        }
        [HttpPost]
        
public ActionResult Index(Models.Entities.GuestBook guest)
        {
            TempData[
"entity"] = guest;
            return RedirectToAction(
"ThankYou");
        }

        
public ActionResult ThankYou()
        {
            
if (TempData["entity"] == null)
            {
                return RedirectToAction(
"Index");
            }
            var model
= TempData["entity"] as Models.Entities.GuestBook;
            return View(model);
        }
    }
}

 

 

  新建view的时候选择强类型的view(create a strongly-typed view)

<%@ Page Title="" Language="C#" MasterPageFile="~/Views/Shared/Site.Master" Inherits="System.Web.Mvc.ViewPage<Mvc3EmptyApp.Models.Entities.GuestBook>" %>

<asp:Content ID="Content1" ContentPlaceHolderID="TitleContent" runat="server">
    Index
</asp:Content>

<asp:Content ID="Content2" ContentPlaceHolderID="MainContent" runat="server">

    
<h2>Index</h2>
    
<% using (Html.BeginForm())
       { %
>
      
<p>
        
<%=Html.LabelFor (model=>model.Name) %>
        
<%=Html.TextBoxFor (model=>model.Name) %>
        
</p>

        
<p>
        
<%=Html.LabelFor (model=>model.Email ) %>
        
<%=Html.TextBoxFor (model=>model.Email ) %>
        
</p>

        
<p>
        
<%=Html.LabelFor (model=>model.Comments ) %>
        
<%=Html.TextAreaFor (model=>model.Comments ) %>
        
</p>

        
<p>
      
<input type="submit" value="Sign" />
        
</p>
    
<%} %>
</asp:Content>

<asp:Content ID="Content3" ContentPlaceHolderID="Header" runat="server">
</asp:Content>

<asp:Content ID="Content4" ContentPlaceHolderID="SideBar" runat="server">
</asp:Content>

<asp:Content ID="Content5" ContentPlaceHolderID="Footer" runat="server">
</asp:Content>

 

<%@ Page Title="" Language="C#" MasterPageFile="~/Views/Shared/Site.Master" Inherits="System.Web.Mvc.ViewPage<Mvc3EmptyApp.Models.Entities.GuestBook>" %>

<asp:Content ID="Content1" ContentPlaceHolderID="TitleContent" runat="server">
    ThankYou
</asp:Content>

<asp:Content ID="Content2" ContentPlaceHolderID="MainContent" runat="server">

    
<h2>ThankYou</h2>
    
<%=Html.DisplayForModel() %>
</asp:Content>

<asp:Content ID="Content3" ContentPlaceHolderID="Header" runat="server">
</asp:Content>

<asp:Content ID="Content4" ContentPlaceHolderID="SideBar" runat="server">
</asp:Content>

<asp:Content ID="Content5" ContentPlaceHolderID="Footer" runat="server">
</asp:Content>

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