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asp.net mvc - Bind model property collections

问题描述:

My scenario is much complicated so i simplified it with the example below. The main problem is binding collection properties of a model, specifying the path of the property like Html.TextBox("List[0].Name") and not the Html.TextBoxFor(t => t.List[0].Name). So, for the current view i will only know some of the metadata of the model so i will have to construct it this way. Here is the scenario :

Model

public class ModelTest

{

public int Id {get;set;}

public List<Foo> Collection {get;set;}

}

public class Foo

{

public string Value1 {get;set;}

public string Value2 {get;set;}

}

Controller

public class TestController: Controller

{

[HttpGet]

public ActionResult Test()

{

var model = new ModelTest()

{

Id = 455,

Collection = new List<Foo>()

{

new Foo(){ Value1 = "sagasga", Value2 = "Beul"},

new Foo(){ Value1 = "dgdsgds", Value2 = "fhfhd" }

}

};

return View(model);

}

[HttpPost]

public ActionResult Test( ModelTest model)

{

//....

return View();

}

View:

@using (Html.BeginForm())

{

@Html.TextBox("Id")

@Html.TextBox("Collection[0].Value1")

@Html.TextBox("Collection[0].Value2")

<input type="submit" value="Add" />

}

For the code above i get empty textboxes for the collection values. However, when the page is submited i get the model built correct in the Post method.

Many thanks,

Alex

网友答案:

This is the way to name you input fields when you wanna post a collection to your controller. However, you have to specify the initial value yourself. Your code is currently just creating textbox with the name property set to Collection[0].Value1. You still need to specify the input this way,

@Html.TextBox("Collection[0].Value1", Model.Collection.FirstOrDefault().Value1)
@Html.TextBox("Collection[0].Value2", Model.Collection.FirstOrDefault().Value2)
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