Viewdata is the collection of state that is passed to a view. A view should get all the information it needs from the viewdata. It contains key/value pairs as well as some special properties, such as Model. Viewdata is accessible on the controller as well. The controller is responsible for filling the viewdata dictionary with objects. When a view is executing, it will pull various object from viewdata while it is rendering. If an expected object is not present, then you will see the same type of exception present in any code using a dictionary collection in .Net.
How to use View Data?
Here, I am going to explain how to use ViewData in View to get the information dynamically through Controller and Model.
In HomeController.cs, we set the Current Date and Time by using Now property of DateTime class in the field of ViewData property.
using System;
using System.Web.Mvc;
using ViewData.Models;
namespace ViewData.Controllers
{
public class HomeController : Controller
{
public ActionResult Index()
{
ViewData["CurrentTime"] = DateTime.Now.ToString(); //set the current date and time in ViewData field time in ViewData field time in ViewData field time in ViewData field return View(new ModelClass());
}
}
}
In ModelClass.cs, we created a property named as FirstName that return a name.
namespace ViewData.Models
{
public class ModelClass
{
public string FirstName
{
get
{
return "Rohit";
}
}
}
}
After setting the data in ViewData, here in View we retrieved the information in View through ViewData.
<%@ Page Language="C#" Inherits="System.Web.Mvc.ViewPage<ViewData.Models.ModelClass>" %>
<!DOCTYPE html>
<html>
<head runat="server">
<title>Index</title>
</head>
<body>
<div>
<!--Getting data from Model ViewData -->
<h3>Hello! <%: ViewData.Model.FirstName %> <br /><br />
<!--Getting data from Controller View Data -->
The current date and time is <%: ViewData["CurrentTime"] %></h3>
</div>
</body>
</html>
The above code display output like below:
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