ViewData与ViewBag比较

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ViewData与ViewBag比较

在Asp.net MVC 3 web应用程序中，我们会用到ViewData与ViewBag，对比一下：

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 &nbsp; : @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 &nbsp; : @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 &nbsp; : @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 &nbsp; : @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);}
}

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