asp.net MVC 3, Html.EditorFor in different Model

Question

I have 2 class in Model

public class User
{
    public int UserID { get; set; }
    public string UserName { get; set; }
}

public class Product
{
    public int ProductID { get; set; }
    public string ProductName { get; set; }
}

I have a view that use both class and I need use html.TextBoxFor. I can create BigModel:

public class BigModel
{
    public User user;
    public Product product;
}

so in View:

@model BigModel
@Html.TextBoxFor(m=> m.user.UserName)
@Html.TextBoxFor(m=> m.product.ProductName)

Or i can use different partial view and reander them. But they are not my favorite solution.

Isn't there another way? such as:

<p>    
    User Name:
    @Html.TextBoxFor<User>(u=> u.UserName)
</p>
<p>    
    Product Name:
    @Html.TextBoxFor<Product>(p=> p.ProductName)
</p>

gdoron · Accepted Answer · 2012-02-04 17:30:42Z

2

Look at TextBoxFor method signature:

public static MvcHtmlString TextBoxFor<TModel, TProperty>(
this HtmlHelper<TModel> htmlHelper,
Expression<Func<TModel, TProperty>> expression
)

It's impossible. to write:

@Html.TextBoxFor<Product>(p=> p.ProductName)

So you are "stuck" with this:

@Html.TextBoxFor(m=> m.product.ProductName)

(I don't know why you prefer the first version, it's even one char longer... =) )

edited Feb 4, 2012 at 17:30

answered Jan 29, 2012 at 8:16

gdoron

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6 Comments

Morteza Over a year ago

in second version add new class to model: BigModel. if i want use it I must add tens of class to model.

gdoron Over a year ago

@MortezaTavakoli. You have to have that two classes in your Model, Where do you think the HTML helper takes the value from?

Morteza Over a year ago

this is part of my page. i get value by ajax. i need html helper such as Html.LabelFor<User>(u=> u.UserName).

gdoron Over a year ago

@MortezaTavakoli. And if there will error in the POST how the attempted value will be saved rendered?

Morteza Over a year ago

it is not my problem. i get and set data by Ajax correctly. i only need to reander <label> and <input> tag by Html.LebelFor or Html.TextBoxFor

|

Erik Funkenbusch · Accepted Answer · 2012-01-29 09:52:36Z

0

How exactly do you think you'll get the reference to User and Product that way? The generics only expose the TYPE of object, not the instance of the object. Even so, no generic versions of those exist.

I have seen several quesitons like this recently. What is the big deal with referencing the full type? Why do people have problems with this?

If you are passing your data view ViewBag, then you can simply do this:

@Html.TextBoxFor(m => ViewBag.Value)

However that's rather silly since a) you lose your model binding and b) you aren't gaining strong typing, so you might as well just use the non-strongly typed.

@Html.TextBox("Value", ViewBag.Value);

edited Jan 29, 2012 at 9:52

answered Jan 29, 2012 at 8:16

Erik Funkenbusch

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2 Comments

Morteza Over a year ago

I get data by ViewBag or Ajax. i need html Helper such as: Html.LabelFor<User>(u=> u.UserName)

Erik Funkenbusch Over a year ago

You aren't making any sense. No, you don't need an Html helper such as that. First, it doesn't exist. Second, it can't work. It's impossible for it to work that way, Generic methods can't function as you want them to.

user1613512 · Accepted Answer · 2017-04-06 08:57:20Z

0

With C#6 you might consider not using the @Html helper but just write inputs as plain html.

For example:

<input type="text" name="@($"{nameof(BigModel.User)}.{nameof(User.UserName)})" />

This is also handy when you are not using the same model for get as postback.

answered Apr 6, 2017 at 8:57

user1613512

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