ViewBag、ViewData使用

1、Example - Using ViewData

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"] = 25;

    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:
</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>

(I know the code might look cleaner with Razor View engine, but it doesn’t matter right? ;) ) 

2、Example - 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;
    ViewBag.Name = "Hajan";
    ViewBag.Age = 25;
    return View(); 
}

You see the difference?

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 ViewBag.ListColors) { %>
    <li>
        <font color="<%: color %>"><%: color %></font>
    </li>
<% } %>

</ul>
<p>
    <%: ViewBag.DateNow %>
</p>