我可以在使用编辑器时创建下拉列表吗？

Question

How do I create drop down list using data annotation?

I would like to achieve markup generated by

@Html.DropDownListFor(x=>x.ContactType, Model.ContactTypeOptions)

to be set so I can use and it would generate dropdown list:

@Html.EditorForModel(Model)

My current model is:

public class ContactModel
    {
        public string ContactType { get; set; }
        public IList<SelectListItem> ContactTypeOptions
        {
            get
            {
                return new List<SelectListItem>()
        {
            new SelectListItem(){Text = "Options"}
        };
            }
        }
        [Required(AllowEmptyStrings = false)]
        [MinLength(15)]
        [DataType(DataType.MultilineText)]
        public string Message { get; set; }
    }

Updated I do not want to use partial view.

Answer 1

You could try something like this:

public class ContactModel
{
    [UIHint("_DropDownList")]
    public SelectList ContactType { get; set; }
}

Set (in your controller) ContactType.Items to be your list of options and ContactType.SelectedValue to be your initially selected value.

Then define a partial view _DropDownList.cshtml :

@model SelectList

@Html.DropDownListFor(m => m.SelectedValue, Model)

You should then be able to use @Html.EditorFor(m => m.ContactType) and get your dropdown. And you can reuse it anywhere!

You might even get this behaviour out of the box nowadays when you do @Html.EditorFor(m => m.Property) where m.Property is a SelectList . Not sure on that one.

If you're looking to just use EditorForModel() on your ContactModel , then you can just create an editor template called ContactModel.cshtml and do:

@model ContactModel

@Html.DropDownListFor(m => m.ContactType,
    new SelectList(Model.ContactTypeOptions, Model.ContactType))

Note that this should be called as @Html.EditorForModel() in a view already typed to a ContactModel - the object passed in as a parameter in the overload EditorForModel(Object) is for additional view data, not for the model object. EditorForModel always renders an editor template for the current view model.