C# - ModelBinder With Multiple Selection And Complex Objects?

Feb 22, 2010

I'm trying to bind the selections in a multiple selection SELECT, to an IList input in the controller.

<select name="users" multiple="multiple">


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public string Id
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I want to be able to update a model and all its collections of child objects in the same view. I have been referred to these examples: http://haacked.com/archive/2008/10/23/model-binding-to-a-list.aspx and http://blog.stevensanderson.com/2010/01/28/editing-a-variable-length-list-aspnet-mvc-2-style/ .

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I have a table in my database with a one to many relationship to another table, which has a relationship to a third table:


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I have a list box that I want to allow the users to select up to 4 items from. I set the selection property to multiple, but for the life of me it won't allow multiple selection. If I pre-select 4 items, they show up as all selected when the page loads, but as soon as I select another, it clears all of them and then only allows one at a time. if I check the source code for the page, the property is set to multiple (see below).

HTML Code:
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I have a view that is based on a view model. This model has a single property called Entity, of type ServiceProvider, which is a Linq2SQL object. This object has relationships to 2 other objects Address and ServiceProviderGroup. In a HTML view I have textboxes that allow the properties of the Entity property to be changed and also the properties of the Address object related to it.

E.g: ViewModel.Entity.Code, ViewModel.Entity.Name, ViewModel.Entity.Address.City, etc, etc.

There is also a selectlist that will allow the Entity.GroupId (int) property to be changed. This defines a relationship to the ServiceProviderGroup class which is also accessible via a Group propery. (standard linq2sql back references)

The Edit[Post] method accepts an instance of this view model and all properties (on the Entity, Entity.Address properties) are set as expected. I then lookup the original object in the database and I also bring back the original address and group data.

E.G: entity => entity.Code == viewModel.Code && entity.Address.Id == viewModel.Address.Id && entity.Group.Id == viewModel.Entity.GroupId (I'm not looking at the code, but it's something similar to this)

Either way the original Entity, Entity.Address, etc, come back from the database. I then apply the changes from the view model to the original object using UpdateModel and everything is updated as expected. But, if I try to change Entity.GroupId, i.e. change the relationship on the entity to another ServiceGroupProvider object, I get an exception in the generated code of the ServiceProvider object.

This happens in the GroupId property of the ServiceProvider class (viewModel.Entity). When it reaches the line if(!this.HasLoadedOrAssignedValue) it enters the "if" statement and throws an exception. When the data is first read from the database it skips this part. But, when UpdateModel attempts to apply the new Entity.GroupId value it throws the exception.

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I have a class:


Then another class, for ProjectCustomer:


My view is the same as any standard auto-created view, with properties set using the likes of:


In my edit page, for editing the fields for these classes, everything works fine, the model binder works, and validation works. In my create page, only the Project class properties get set and the ProjectCustomer properties remain null. I've tried everything I can think of from manually instantiating a new ProjectCustomer before calling TryUpdate model, to letting MVC handle the lot by including the class as a paramater for the action. The values are being passed just fine, as I've tried a FormCollection too and in the debugger the FormCollection contains all the correct fields (i.e. Customer.Name etc.) yet no matter what the ModelBinder just wont attach the inputs to the Customer object inside the Project object, but will only not do this on the Create action, and does it fine for the Edit action even though the code is almost entirely identical.

why the ModelBinder is just refusing to bind for the Create action and no other? What steps can I perform to debug the ModelBinder when it's not working properly like this?

I've tried every combination of things I can think of under the sun, and simply can't understand why it works for one action, but not for another, especially when the code I've used is fairly basic. I'll note that these classes were intended as MetaData classes hence their pointless seeming simplicity, but as part of trying to track down the problem I've stripped them to the bare bones setup above, and still no luck.

Under what circumstances does the ModelBinder decide not to fill the properties of a sub-object?

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Probably will get it right tonight, but figured I'd ask.

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In my aspx registration page i have more then 6 item available in my list box, I am allowing multiple selection on it..I am not sure about how many items i will select each and every time. then how i have to store it into dataset and how to pass it as a mysql paramter...

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I have two ListBox in my ascx file, I fill them with some data (no problem here), I make them multiple and increase the size, below is my code.


I use some jQuery code to exchange element between them (Here too, no problem). My problem begin when I post my form, I'm unable to get the data from the DropDownList with attribute multiple or size. I tried in my controler to add a FormCollection parameter, I can see every element in my form except those select tag with more options than id and name. I tested to put a manual select tag in my code with only an id and a name then add size and multiple attribute, when there is only id and name I can get the value but when there are more I can't get my select tag in the FormCollection

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