MVC3将模型（某些字段）绑定到视图

Question

Binding model to the view.

my model Person has {Id,Title,Address...etc)

In my controller I want to retrieve some fields eg:

 var model = from p in db.Person where p.jobtype == 1 
             select new Person { Title = p.Title, Address = p.Address};
 return View(model);

also tried to to use anonymous type and it doesn't work:

 var model = from p in db.Person where p.jobtype == 1 
             select new { p.Title, p.Address};
 return View(model);

In my view:

 @model IEnumerable<Demo.Models.Person>
 @foreach (var item in Model) {
 <div>@item.Title</div>}  >FAILS

If I retrieve full object then it works, how do I retrieve some fields using anonymous type or\\and using my model.... plz provide the correct syntax. Thanks

Answer 1

If your View is requiring the Model to be Enumerable then it needs to be AsEnumerable in your select statement.

var model = (from p in db.Person
            where p.jobtype == 1
            select p).AsEnumerable();

return View(model);

and then

@model IEnumerable<Demo.Models.Person>

@foreach (var item in Model.ToList()) {
<div>@item.Title</div>}

---

Alternatively, Since you just need a list at the end of the day, and you "should" be using a ViewModel, I suggest the following.

ViewModel

public class PersonViewModel
{
    public int Name { get; set; }
    public string Title { get; set; }
}

Controller

var person = (from p in db.Person
            where p.jobtype == 1
            select p);

PersonViewModel model = Mapper.Map<Person, PersonViewModel>(person);

return View(model.ToList());

View

@model List<Demo.ViewModels.PersonViewModel>

@foreach (var item in Model) {
<div>@item.Title</div>}

note: I used AutoMapper in the above example
_{I don't have my IDE in front of me, so I'm not sure if this is perfect.}

Answer 2

You can use .ToList() :

List<person> model = (from p in db.Person 
                      where p.jobtype == 1 
                      select p).ToList();
return View(model);

In your view :

 @model List<person>
 @foreach (var item in Model) {
 }

Answer 3

I would recommend that you call your data db.People or something like that.

You should use p.ID == 3 instead of p.ID = 3 .

If your intention is to only select one Person and display then use SingleOrDefault() , First() , FirstOrDefault() to get only a single Person-entry.

var model = (from p in db.Person where p.ID == 3 
             select p.Title).First();

Then in your model don't use IEnumerable, just use:

 @model Demo.Models.Person
      <div>@item.Title</div>

EDIT: after you updated question to contain p.jobtype instead of p.ID to select multiple I would recommend using a specific ViewModel for the data you wish to select. If all you want is Title then you could use

@model IEnumerable<string>
@foreach (var title in Model) {
 <div>@title</div>}

But I would recommend using a specific ViewModel with only the fields you require, for example:

public class PersonViewModel
{
    public int Name { get; set; }
    public string Title { get; set; }
}

and then select new PersonViewModel {Name = p.Name, Title = p.Title } and of course use that model in the view: @model IEnumerable<PersonViewModel> .