ASP.NET MVC Model Binding a Collection With a Prefix

Question

I want to bind a collection using a prefix, like so

public ActionResult Whatever([Bind(Prefix = "Prefix")] CustomModel[] models)

I created form elements using

<%= Html.TextBox("Prefix.models[" + i + "].Property") %>

which generated html inputs like this

<input id="Prefix_models[0]_Property" name="Prefix.models[0].Property" />

My problem is that the default model binder will not bind with a prefix. I get null for the models arg in the action method.

If I strip the prefixes from the html and remove the Bind attribute, everything works fine. I cannot imagine that the default model binder won't handle a prefix on a collection, so I must be doing something wrong.

Please help. Cheers!

Levi · Accepted Answer · 2010-02-23 18:15:26Z

13

Prefix inside of [Bind] isn't prepended to the parameter name, it replaces the parameter name entirely. So if your action method has this signature:

public ActionResult MyAction([Bind(Prefix = "foo")] string[] bar) { ... }

The the binder expects foo[0], foo[1], etc.

answered Feb 23, 2010 at 18:15

Levi

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1 Comment

spot Over a year ago

DOH! Rough day. Thanks for setting my head straight!

bkaid · Accepted Answer · 2010-02-23 15:43:49Z

1

UpdateModel() and TryUpdateModel() take a parameter for prefix. Have you tried that?

answered Feb 23, 2010 at 15:43

bkaid

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