ViewData与ViewBag比较
2024-05-11 00:50:23
在Asp.net MVC 3 web应用程序中，我们会用到ViewData与ViewBag，对比一下：
| ViewData | ViewBag |
| 它是Key/Value字典集合 | 它是dynamic类型对像 |
| 从Asp.net MVC 1 就有了 | ASP.NET MVC3 才有 |
| 基于Asp.net 3.5 framework | 基于Asp.net 4.0与.net framework |
| ViewData比ViewBag快 | ViewBag比ViewData慢 |
| 在ViewPage中查询数据时需要转换合适的类型 | 在ViewPage中查询数据时不需要类型转换 |
| 有一些类型转换代码 | 可读性更好 |
在Controller中使用ViewData:
public ActionResult UsingViewData()
{
ViewData["Title"] = " Using ViewData";
ViewData["ProjectName"] = "My Test Project";
ViewData["ProjectDescription"] = "This is Test Project to demo Viewdata and viewbag details";
ViewData["StartDate"] = new DateTime(2011, 1, 1);
ViewData["TotalPrice"] = 1000;
ViewData["TotalDays"] = 100;
Dictionary<string, string> stackholder = new Dictionary<string, string>();
stackholder.Add("Client","Mr. Client");
stackholder.Add("Manager","Mr. Joy");
stackholder.Add("Team Leader","Mr.Toy");
stackholder.Add("Sr. developer", "Mr.dojoy");
stackholder.Add("developer", "Mr. nodoy");
ViewData["stackholder"] = stackholder;
List<string> modules = new List<string>();
modules.Add("Admin module");
modules.Add("ShoppingCart module");
modules.Add("CMS module");
ViewData["modules"] = modules;
return View();
}
对应UsingViewData View的cshtml:
<h1>@ViewData["Title"]</h1>
<div>
<div>
<h2>Project Name : @ViewData["ProjectName"]</h2>
</div>
<div>
ProjectDescription :
<p>"@ViewData["ProjectDescription"]".</p>
</div>
<div>
Stack Holder :
<br />
<ul id="stakholder">
@foreach ( var stakerholder in ViewData["stackholder"] as Dictionary<string, string> )
{
<li>
@stakerholder.Key : @stakerholder.Value
</li>
}
</ul>
</div>
<div>
Project Details:<br />
<div>
module List :
<ul id="modulelist">
@foreach ( var module in ViewData["modules"] as List<string> )
{
<li>
@module
</li>
}
</ul>
</div>
Project StartDate : @ViewData["StartDate"] <br />
Project TotalPrice: @ViewData["TotalPrice"] <br />
Project TotaDays : @ViewData["TotalDays"]
</div>
</div>
然后是ViewBag:
public ActionResult UsingViewBag()
{
ViewBag.Title = " Using ViewBag";
ViewBag.ProjectName = "My Test Project";
ViewBag.ProjectDescription = "This is Test Project to demo Viewdata and viewbag details";
ViewBag.StartDate = new DateTime(2011, 1, 1);
ViewBag.TotalPrice = 1000;
ViewBag.TotalDays = 100;
Dictionary<string, string> stackholder = new Dictionary<string, string>();
stackholder.Add("Client", "Mr. Client");
stackholder.Add("Manager", "Mr. Joy");
stackholder.Add("Team Leader", "Mr.Toy");
stackholder.Add("Sr. developer", "Mr.dojoy");
stackholder.Add("developer", "Mr. nodoy");
ViewBag.stackholder = stackholder;
List<string> modules = new List<string>();
modules.Add("Admin module");
modules.Add("ShoppingCart module");
modules.Add("CMS module");
ViewBag.modules = modules;
return View();
}
对应View UsingViewBag 的cshtml的ViewBag:
<h1>@ViewBag.Title</h1>
<div>
<div>
<h2>Project Name : @ViewBag.ProjectName</h2>
</div>
<div>
ProjectDescription :
<p>"@ViewBag.ProjectDescription.</p>
</div>
<div>
Stack Holder :
<br />
<ul id="stakholder">
@foreach ( var stakerholder in ViewBag.stackholder )
{
<li>
@stakerholder.Key : @stakerholder.Value
</li>
}
</ul>
</div>
<div>
Project Details:<br />
<div>
module List :
<ul id="modulelist">
@foreach ( var module in ViewBag.modules )
{
<li>
@module
</li>
}
</ul>
</div>
Project StartDate : @ViewBag.StartDate.ToString("dd-MMM-yyyy") <br />
Project TotalPrice: @ViewBag.TotalPrice ₹ <br />
Project TotaDays : @ViewBag.TotalDays
</div>
</div>
后面是在Controller中使用ViewBag:
public ActionResult UsingViewBagInControlAndViewDataInView()
{
ViewBag.Title = " Using ViewBag In Control And ViewData In View";
ViewBag.ProjectName = "My Test Project";
ViewBag.ProjectDescription = "This is Test Project to demo Viewdata and viewbag details";
ViewBag.StartDate = new DateTime(2011, 1, 1);
ViewBag.TotalPrice = 1000;
ViewBag.TotalDays = 100;
Dictionary<string, string> stackholder = new Dictionary<string, string>();
stackholder.Add("Client", "Mr. Client");
stackholder.Add("Manager", "Mr. Joy");
stackholder.Add("Team Leader", "Mr.Toy");
stackholder.Add("Sr. developer", "Mr.dojoy");
stackholder.Add("developer", "Mr. nodoy");
ViewBag.stackholder = stackholder;
List<string> modules = new List<string>();
modules.Add("Admin module");
modules.Add("ShoppingCart module");
modules.Add("CMS module");
ViewBag.modules = modules;
return View();
}
在UsingViewBagInControlAndViewDataInView.cshtml中使用ViewData来取值：
<h1>@ViewData["Title"]</h1>
<div>
<div>
<h2>Project Name : @ViewData["ProjectName"]</h2>
</div>
<div>
ProjectDescription :
<p>"@ViewData["ProjectDescription"]".</p>
</div>
<div>
Stack Holder :
<br />
<ul id="stakholder">
@foreach ( var stakerholder in ViewData["stackholder"] as Dictionary<string, string> )
{
<li>
@stakerholder.Key : @stakerholder.Value
</li>
}
</ul>
</div>
<div>
Project Details:<br />
<div>
module List :
<ul id="modulelist">
@foreach ( var module in ViewData["modules"] as List<string> )
{
<li>
@module
</li>
}
</ul>
</div>
Project StartDate : @ViewData["StartDate"] <br />
Project TotalPrice: @ViewData["TotalPrice"] <br />
Project TotaDays : @ViewData["TotalDays"]
</div>
</div>
反过来是这样的:
public ActionResult UsingViewDataInControlAndViewBagInView()
{
ViewData["Title"] = " Using ViewData In Control And ViewBag In View";
ViewData["ProjectName"] = "My Test Project";
ViewData["ProjectDescription"] = "This is Test Project to demo Viewdata and viewbag details";
ViewData["StartDate"] = new DateTime(2011, 1, 1);
ViewData["TotalPrice"] = 1000;
ViewData["TotalDays"] = 100;
Dictionary<string, string> stackholder = new Dictionary<string, string>();
stackholder.Add("Client", "Mr. Client");
stackholder.Add("Manager", "Mr. Joy");
stackholder.Add("Team Leader", "Mr.Toy");
stackholder.Add("Sr. developer", "Mr.dojoy");
stackholder.Add("developer", "Mr. nodoy");
ViewData["stackholder"] = stackholder;
List<string> modules = new List<string>();
modules.Add("Admin module");
modules.Add("ShoppingCart module");
modules.Add("CMS module");
ViewData["modules"] = modules;
return View();
}
在UsingViewDataInControlAndViewBagInView.cshtml 的View中使用ViewBag来取值:
<h1>@ViewBag.Title</h1>
<div>
<div>
<h2>Project Name : @ViewBag.ProjectName</h2>
</div>
<div>
ProjectDescription :
<p>"@ViewBag.ProjectDescription.</p>
</div>
<div>
Stack Holder :
<br />
<ul id="stakholder">
@foreach ( var stakerholder in ViewBag.stackholder )
{
<li>
@stakerholder.Key : @stakerholder.Value
</li>
}
</ul>
</div>
<div>
Project Details:<br />
<div>
module List :
<ul id="modulelist">
@foreach ( var module in ViewBag.modules )
{
<li>
@module
</li>
}
</ul>
</div>
Project StartDate : @ViewBag.StartDate.ToString("dd-MMM-yyyy") <br />
Project TotalPrice: @ViewBag.TotalPrice ₹ <br />
Project TotaDays : @ViewBag.TotalDays
</div>
</div>
这样对比看上去会比较清楚一些。在源代码中的ViewBag是这样的属性:
public dynamic ViewBag {
get {
if (_dynamicViewData == null) {
_dynamicViewData = new DynamicViewDataDictionary(() => ViewData);
}
return _dynamicViewData;
}
}
ViewData是：
public ViewDataDictionary ViewData {
get {
if (_viewData == null) {
SetViewData(new ViewDataDictionary());
}
return _viewData;
}
set {
SetViewData(value);
}
}
ViewData与ViewBag比较相关推荐
- Asp.net MVC中的ViewData与ViewBag
在Asp.net MVC 3 web应用程序中,我们会用到ViewData与ViewBag,对比一下: ViewData ViewBag 它是Key/Value字典集合 它是dynamic类型对像 从 ...
- ASP.NET MVC 传值方法ViewData与ViewBag的区别
一.介绍 在Asp.net MVC 3 web应用程序中,我们会用到ViewData与ViewBag,对比一下: ViewData ViewBag 它是Key/Value字典集合 它是dynamic类 ...
- Asp.net MVC中的ViewData与ViewBag
在Asp.net MVC 3 web应用程序中,我们会用到ViewData与ViewBag,对比一下: ViewData ViewBag 它是Key/Value字典集合 它是dynamic类型对像 从 ...
- ViewData与ViewBag的区别是什么
一.ViewBag的定义 public dynamic ViewBag { get { if (_dynamicViewData == null) { ...
- ViewData、ViewBag和 TempData
ViewData.ViewBag和 TempData 首先这三个对象都是在mvc中传递数据的. ViewData的声明和调用(写法) //声明ViewData["www"] = & ...
- mvc中viewdata 和viewbag的区别
ViewData ViewBag 它是Key/Val ...
- MVC中的ViewData、ViewBag和TempData
一.ViewBag和ViewData的定义 public dynamic ViewBag { get; } public ViewDataDictionary ViewData { get; set; ...
- ViewData与ViewBag的使用和区别
ViewData与ViewBag的区别 1.ViewData是字典类型,赋值方式以键值对的形式,通过key值读取对应的value, ViewData["myName"]. 2.Vi ...
- 《MVC》——ViewData、ViewBag、TempData、model
在学习MVC的过程中,Controller里面向View传递数据很重要,我们在Controller里面讲数据加工以后,传递给View,然后让View将数据在浏览器上显示出来,这样我们就能在浏览器上看见 ...
最新文章
- linux定期清理日志文件
- [工具]-脚本自动化工具:按照linux kernel标准格式化输出文件(format_file)
- 细节满满！理解对比学习和SimCSE，就看这6个知识点
- Java自动生成增量补丁自动部署_java-Hibernate正在为表生成自动增量交替ID
- 深度学习入门——波士顿房价预测
- c语言谭浩强简介,大一C语言谭浩强总结(到数组)简介.ppt
- VC++6.0安装番茄助手Visual Assist X和VC6LineNumberAddin的方法
- 项目管理及Office Project 2013 项目管理计划工具的使用详解(全)
- 25个个免费英文文献下载网站！
- base64原理及其编解码的python实现
- 5种好看实用的字体分享
- C# 将Excel导出PDF
- 2019年信息系统项目管理师考试时间
- 计算机无法安装hp网络打印机,hp打印机驱动安装失败怎么办 hp打印机驱动安装失败的解决办法...
- js 获取 当前年月日以及农历日期和星期几
- 爱奇艺面向海量设备的边缘计算PAAS平台及应用实践
- SpringBoot项目的云服务器部署
- QChart之QBarSeries绘制条形图
- #18 可视化基础4-簇形柱状图、百分比堆积柱状图、并列子图
- 安利一个Visual Studio插件 Visual Assist 小番茄