How to Successfully Pass a Collection to a Partial View and Handle Data Submission in ASP.NET MVC?

A Partial View passing a collection using the Html.BeginCollectionItem helper

This question explores the issue of passing a collection of objects to a Partial View and successfully submitting the data back to the controller. Despite seemingly correct implementation, the AddRecord() method was failing and the BeginCollectionItem helper was not generating the necessary hidden tag for newly added fields.

Analysis of the Issue

The root cause of the problem lies in the mismatch between the object type expected by the controller and the data being sent. In the provided code, the view model was changed to CashRecipientVM, but the controller action was still expecting a model of type CashRecipient.

Solution

To resolve this issue, the following steps were taken:

1. Creation of a ViewModel (CashRecipientVM):

   • A CashRecipientVM class was created to represent the data to be edited and included validation attributes.

2. Partial View (_Recipient.cshtml):

   • A Partial View "_Recipient.cshtml" was created to render a single CashRecipientVM instance.
   • The BeginCollectionItem helper was used to bind the properties and allow for adding multiple recipients.

3. Recipient() Method (in Controller):

   • A Recipient() method was added to the controller to return a Partial ViewResult for a new CashRecipientVM.

4. Main GET Method (Create):

   • The Create() GET method was updated to return an empty list of CashRecipientVM instances.

5. Main View:

   • The main View was updated to use the Partial View "_Recipient.cshtml" to display existing recipients and allow for adding new ones.

6. Javascript:

   • Javascript functions were added to handle adding new recipients and deleting existing ones.
   • jQuery and unobtrusive client-side validation were used to enhance user experience.

7. Update the Form POST Action (Create):

   • The form's POST action was updated to target the Create() action, which now expects a collection of CashRecipientVM objects.

By implementing these changes, the application now successfully binds the CashRecipientVM data, allows for dynamic addition and removal of recipients, and submits the data correctly to the controller.

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