I want to show Components in a tabs , so first of all create few components. In this project we have three components, First View Component public class AllViewComponent : ViewComponent { private readonly UserManager<ApplicationUser> _userManager; public AllViewComponent(UserManager<ApplicationUser> userManager) { _userManager = userManager; } public async Task<IViewComponentResult> InvokeAsync() { List<StudentViewModel> allUsers = new List<StudentViewModel>(); var items = await _userManager.Users.ToListAsync(); foreach (var item in items) { allUsers.Add(new StudentViewModel {Id=item.Id, EnrollmentNo = item.EnrollmentNo, FatherName = item.FatherName, Name = item.Name, Age = item.Age, Birthdate = item.Birthdate, Address = item.Address, Gender = item.Gender, Email = item.Email }); }
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Differences
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ViewData
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ViewBag
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ViewData is a dictionary of objects that are stored and retrieved
using strings as keys.
Such as:
ViewData[“key”]=value; //
stored value in ViewData
String n = ViewData[“Key”]; // Retrieve Data
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ViewBag uses the dynamic feature that was introduced in to c# 4. It
allows an object to have properties dynamically add to it.
ViewBag.name = “Jacob”;
// here name is the dynamic property of //ViewBag object
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Similarities
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Both ViewData ans ViewBag are used to pass
data from a controller to a View.
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Both ViewData & ViewBag does not provide
compile time error checking
Example
Controller class
public ActionResult
Index()
{
ViewBag.country = new List<string>()
{
"USA",
"INDIA",
"UK"
};
return View();
}
View
<ul>
@foreach (string country in ViewBag .coun)
{
<li>@country</li>
}
</ul>
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Note : In View here you
are accessing dynamic property of coun , which is not existing in Controller
class. But in case Both ViewData & ViewBag does not provide
compile time error checking
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