asp.net mvc. Passing a list via viewData

Question

Hi does anyone know how to pass a list throught the "ViewData". This is what I'm trying but I think I'm missing a cast some where.

List<GalleryModel> galleryList = new List<GalleryModel>();
        galleryList.Add(new GalleryModel() { isApproved = true, uri = "www.cnn1.com" });
        galleryList.Add(new GalleryModel() { isApproved = true, uri = "www.cnn2.com" });

        ViewData["SomeList"] = galleryList;

here's my aspx page code:

 <% List<myNS.CM.AVDTalentApplication.Models.GalleryModel> galList = ViewData["SomeList"];  %>
<% foreach (var gal in galList) { %>
<%= gal.uri%>
<%} %>

score 18 · Accepted Answer · answered Nov 08 '10 at 16:59

18

For this line:

List<myNS.CM.AVDTalentApplication.Models.GalleryModel> galList = ViewData["SomeList"];

change it to

var galList = ViewData["SomeList"] as List<myNS.CM.AVDTalentApplication.Models.GalleryModel>;

answered Nov 08 '10 at 16:59

Daniel A. White

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Worked Great. Thanks! I don't know why the other type of casting doesn't work. – RayLoveless Nov 08 '10 at 17:10

score 2 · Answer 2 · answered Nov 08 '10 at 17:00

2

You need to cast it in the view:

<% var galList = ViewData["SomeList"] as List<myNS.CM.AVDTalentApplication.Models.GalleryModel>;  %>

or

<% var galList = (List<myNS.CM.AVDTalentApplication.Models.GalleryModel>) ViewData["SomeList"];  %>

answered Nov 08 '10 at 17:00

Nasir

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score 0 · Answer 3 · answered Nov 08 '10 at 16:59

0

You have to explicitly cast the object out of the ViewData collection as the type you need to interact with:

<%@ Import Namespace="myNS.CM.AVDTalentApplication.Models" %>

<% foreach(var gal in (List<GalleryModel>) ViewData["SomeList"]) %>
<% { %>
    <%= gal.uri %>
<% } %>

answered Nov 08 '10 at 16:59

Justin Niessner

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it didn't like that type of casting. see the answer. – RayLoveless Nov 08 '10 at 17:30

score 0 · Answer 4 · edited Mar 03 '19 at 16:38

0

Even though all the above answers are correct, I would strongly suggest making use of view models.

edited Mar 03 '19 at 16:38

Cœur

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answered Nov 08 '10 at 17:09

stoic

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oh shoot, this was meant as a comment – stoic Nov 08 '10 at 17:10

asp.net mvc. Passing a list via viewData

4 Answers4