How Can I Use Html.BeginCollectionItem to Manage Multiple Model Instances in ASP.NET MVC Partial Views?

Using Html.BeginCollectionItem to Pass a Collection to a Partial View

When creating a form that allows users to add multiple instances of a model, it's often necessary to render a partial view for each instance. ASP.NET MVC provides the Html.BeginCollectionItem helper to facilitate this process.

The BeginCollectionItem helper creates a table row that contains the form fields for the current instance of the model. When the form is submitted, the data entered into these fields will be bound to the corresponding properties of the model object.

To use BeginCollectionItem, you must first create a partial view that represents the form fields for a single instance of the model. For example, consider the following partial view named _Recipient.cshtml:

@model CashRecipientVM
<div>

This partial view defines a form with two text boxes (for Recipient and Amount) and a delete button. The BeginCollectionItem helper ensures that each instance of the model will have its own set of form fields.

In the main view, you can use the BeginCollectionItem helper to add a collection of these partial views to the form. For example:

@model IEnumerable<CashRecipientVM>
@using (Html.BeginForm())
{
    <div>

This code creates a form with a list of CashRecipientVM objects. The BeginCollectionItem helper is used to render a partial view for each object in the list.

The form includes a "Add" button that allows the user to add additional instances of the model. When the "Add" button is clicked, an AJAX request is made to the controller to retrieve another partial view. The retrieved partial view is then added to the form.

When the form is submitted, the data entered into the form fields will be bound to the corresponding properties of the CashRecipientVM objects. The controller can then process these objects and save them to the database.

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