Dynamics of viewbag in asp.net MVC3

In MVC 3, there is a new ViewBag dynamic feature, which is intended primarily for use in the viewdata[] dictionary classes that are used to pass values from controller to view. For ViewBag is so powerful that you can dynamically set/get values, add any number of extra fields without requiring strong type detection.

To see these differences (and without viewbag), let's look at the examples:

Eample:--using ViewBag

Controller

Public ActionResult Index ()  

 {  

     list<string> colors = new list<string> ();  

     Colors. ADD ("Red");  

     Colors. ADD ("green");  

     Colors. ADD ("Blue");              

    

    viewdata["listcolors"] = colors;  

     viewdata["Datenow"] = DateTime.Now;  

     viewdata["name"] = "Hajan";  

     Viewdata["age"] = =;  

    

    return View ();  

 } 

View (ASPX view Engine)

P>  

My      name is     <b><%: viewdata["name"%></B>,     <b><% : viewdata[' age ']%></b> years old.      <br/>      

I like      the following colors:  

modified  </p> <ul id=  "Colors" >  <% foreach (var color in viewdata["Listcolors"] as list<string>) {%>      <li >         <font color= "<%: Color%>" ><%: Color%></font>     </li>  <%}%>  </ul>  <p>      <%: viewdata["Datenow "]%>  </p> 

Eample:-using ViewBag

Controller

Public ActionResult Index ()  {      list<string> colors = new list<string> ();      colors. ADD ("Red");      colors. ADD ("green");      colors. ADD ("Blue");     viewbag.listcolors = Colors//colors is List      viewbag.datenow = DateTime.Now;  

Ten      viewbag.name = "Hajan";  

One      viewbag.age =;  

return      View ();   

13} 

Do you see the difference between you and the above?

View (ASPX view Engine)

<p> my  

     name is  

    <b><%: Viewbag.name%></b>,   

    <b><%: Viewbag.age%>< /b> years old.  

     <br/>      

     I like the following colors:  

 </p>  

 <ul id= "Colors" >  

    

<% foreach (var color in V iewbag.listcolors) {%>  

     <li>  

         <font color= "<%: Color%>" ><%: Color%></font>< C10/></li>  

 <%}%>  

    

</ul>  

 <p>  

     <%: Viewbag.datenow  

 %> </p > 

In the above example ViewBag is dynamic, so I don't need to convert viewbag.listcolors into a form like list<string>. On the other hand, this viewdata["key" is one of the other.

If you use the viewdata["Listcolors"]=colors in your controller, you can retrieve them by viewbag.listcolors in the view attempt.