Question:
Can someone point me to an article that shows the dropdownlist being populated from linq to sql (text and value being set).
Thanks Danny
Solution:1
Now that the HtmlHelper extension takes an IEnumerable<SelectListItem>, I don't create SelectList's, but usually just create the SelectListItems with LINQ.
Controller
ViewData["CategoryID"] = categories.Select( c => new SelectListItem { Text = c.CategoryName, Value = c.CategoryID } ); View
<%= Html.DropDownList("CategoryID") %> or if I want a default selection
<%= Html.DropDownList("CategoryID", (IEnumerable<SelectListItem>)ViewData["CategoryID"], "Select a Category" ) %> EDIT:
The interesting bit about the dropdown list is that you need to supply a range of values from which to select a single value that fits into your actual data model. I typically provide the range (menu items) via view data and expect back the model values when the page is posted. If you wanted strongly-typed menus as well, you'd need to provide a view-only model that encapulates your real model and any menus. This would involve, on posting, the use of prefixes to identify the model elements. The trade-off, to my mind, is simpler model binding on post vs. the use of strongly-typed menus in the view. I'm not hung up on the latter, so I opt not to put my menus in the model. If you wanted to do this, though, it might look like the following.
Model
public class CategoryViewModel { public Category Category { get; set; } public IEnumerable<SelectListItem> CategoryMenu { get; set; } ... } Controller
Display action
var model = new CategoryViewModel(); model.CategoryMenu = categories.Select( c => new SelectListItem { Text = c.CategoryName, Value = c.CategoryID } ); ... return View(model); Create action
[AcceptVerbs( HttpVerbs.Post )] public ActionResult Create( [Bind(Prefix="Category")]Category category ) { ... } View
<%= Html.TextBox("Category.Name") %> <%= Html.DropDownList("Category.CategoryID", Model.CategoryMenu, "Select a Category" ) %>
Solution:2
Here's one great article by Rob Connery
Controller Code
NorthwindDataContext db = new NorthwindDataContext(); var categories = from c in db.Categories select c; ViewData["CategoryID"] = new SelectList(categories, "CategoryID", "CategoryName"); View Markup
<%=Html.DropDownList("CategoryID")%>
Solution:3
If you need to add html attributes to your tags this would be a way of doing it. Pass a Model to your View e.i. "return View(someModel)" then in the View:
<select id="Groups" name="Groups"> <% foreach (SelectListItem item in Model.GroupsDropDown) { if (item.Selected) {%> <option selected="selected" title="<%= item.Text %>"> <%= item.Text%></option> <%} else {%> <option title="<%= item.Text %>"> <%= item.Text%></option> <%} %> <% } %> </select> GroupsDropDown is a property in your Model like this:
public IEnumerable GroupsDropDown { get; set; }
Solution:4
Write in the view:
@{ TaskManagerContext context = new TaskManagerContext(); IEnumerable<TestTask1.Models.User> CDrop = context.Users.ToList(); List<SelectListItem> selectList = new List<SelectListItem>(); foreach (var c in CDrop) { SelectListItem i = new SelectListItem(); i.Text = c.Username.ToString(); i.Value = c.ID.ToString(); selectList.Add(i); } }
You can reference it ike that:
@Html.DropDownListFor(m => m.UserID, new SelectList(selectList, "Value", "Text")); You can also choose a specific row:
TaskManagerContext context = new TaskManagerContext(); UsersRepository repo = new UsersRepository(); User user = repo.GetAll().FirstOrDefault(u => u.ID == ViewBag.UserId); ViewBag.User = user; <div><h3><label>@ViewBag.Title1</label>@ViewBag.User.Username</h3></div> Note:If u also have question or solution just comment us below or mail us on toontricks1994@gmail.com
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