You cannot used the Helper @Html.DropdownListFor, because the first parameter was not correct, change your helper to: @Html.DropDownList(“accountid”, new SelectList(ViewBag.Accounts, “AccountID”, “AccountName”)) @Html.DropDownListFor receive in the first parameters a lambda expression in all overloads and is used to create strongly typed dropdowns. Here’s the documentation If your View it’s strongly typed to some Model you … Read more
dynamic MyDynamic = new System.Dynamic.ExpandoObject(); MyDynamic.A = “A”; MyDynamic.B = “B”; MyDynamic.C = “C”; MyDynamic.Number = 12; MyDynamic.MyMethod = new Func<int>(() => { return 55; }); Console.WriteLine(MyDynamic.MyMethod()); Read more about ExpandoObject class and for more samples: Represents an object whose members can be dynamically added and removed at run time.
In my opinion, you should never use ViewBag without a very, very good reason. Brad Thomas’ answer points out a rare example of one of those good reasons. Say you have a master layout (or a partial view) shared by an entire website and dozens of strongly-typed Views that each have their own Model. How … Read more
The ViewBag is the same thing as ViewData in previous ASP.NET MVC 1 and 2. It just happens to be dynamic instead of needing to use it like a dictionary with keys. I don’t think this will replace strongly typed views at all and in fact you should use Viewdata/Viewbag as little as possible. Always … Read more
So, say you have your View with PartialView, which have to be updated by button click: <div class=”target”> @{ Html.RenderAction(“UpdatePoints”);} </div> <input class=”button” value=”update” /> There are some ways to do it. For example you may use jQuery: <script type=”text/javascript”> $(function(){ $(‘.button’).on(“click”, function(){ $.post(‘@Url.Action(“PostActionToUpdatePoints”, “Home”)’).always(function(){ $(‘.target’).load(‘/Home/UpdatePoints’); }) }); }); </script> PostActionToUpdatePoints is your Action with … Read more
ViewBag is a dynamic dictionary. So when using ViewBag to transfer data between action methods and views, your compiler won’t be able to catch if you make a typo in your code when trying to access the ViewBag item in your view. Your view will crash at run time 🙁 Generally it is a good … Read more
Basically, Should everything be done through the viewmodel or is it Ok to also incorporate viewbag? Everything should be done inside a view model. That’s what a view model is. A class that you specifically define to meet the requirements of your view. Don’t mix ViewBags with ViewModels. It is no longer clear for the … Read more
I was having the same problem. Turned out I was missing the ./Views/Web.config file, because I created the project from an empty ASP.NET application instead of using an ASP.NET MVC template. For ASP.NET MVC 5, a vanilla ./Views/Web.config file contains the following: <?xml version=”1.0″?> <!– https://stackoverflow.com/a/19899269/178082 –> <configuration> <configSections> <sectionGroup name=”system.web.webPages.razor” type=”System.Web.WebPages.Razor.Configuration.RazorWebSectionGroup, System.Web.WebPages.Razor, Version=3.0.0.0, Culture=neutral, … Read more
ViewBag is of type dynamic but, is internally an System.Dynamic.ExpandoObject() It is declared like this: dynamic ViewBag = new System.Dynamic.ExpandoObject(); which is why you can do : ViewBag.Foo = “Bar”; A Sample Expander Object Code: public class ExpanderObject : DynamicObject, IDynamicMetaObjectProvider { public Dictionary<string, object> objectDictionary; public ExpanderObject() { objectDictionary = new Dictionary<string, object>(); } … Read more
It uses the C# 4.0 dynamic feature. It achieves the same goal as viewdata and should be avoided in favor of using strongly typed view models (the same way as viewdata should be avoided). So basically it replaces magic strings: ViewData[“Foo”] with magic properties: ViewBag.Foo for which you have no compile time safety. I continue … Read more