更新选定的行实体框架MVC 3

Question

I want to be able to select a row in a table (which represents an invoice), choose a radio button which has an amount value and press 'Confirm'. Once confirm is clicked, I want the status of the selected invoice to change to "Paid" or "Partly Paid" depending on the payment amount select. I also want a new payment entry to be added to the ClientPayments table that is related to the selected invoice, I want the PaymentAmount to be the radio button amount and the date to be the system date.

The code I have at the moment is producing an error, namely: The parameters dictionary contains a null entry for parameter 'id' of non-nullable type 'System.Int32'.

Here is the code I have so far. In the View:

@using (Html.BeginForm("Confirm", "InvoiceController"))
{

foreach (var item in Model)
{
string selectedRow = "";
if (item.InvoiceNumberID == ViewBag.InvoiceNumberID)
{
    selectedRow = "selectedRow";
} 

<tr class="@selectedRow" valign="top">
            <td> 
           <a href='javascript:void(0)' class='select' data-id=@item.InvoiceNumberID     >Select</a>


        </td> 
     <td>
        @Html.DisplayFor(modelItem => item.InvoiceNumberID)
    </td>
    <td>
        @Html.DisplayFor(modelItem => item.InvoiceAmount)
    </td>
    <td>
        @Html.DisplayFor(modelItem => item.InvoiceMonth)
    </td>
    <td>
        @Html.DisplayFor(modelItem => item.InvoiceStatus)
    </td>
    <td>
        @Html.DisplayFor(modelItem => item.Client.FullName)
    </td>
    <td>
        @Html.ActionLink("Edit", "Edit", new { id = item.InvoiceNumberID }) |
        @Html.ActionLink("Details", "Details", new { id = item.InvoiceNumberID }) |
        @Html.ActionLink("Delete", "Delete", new { id = item.InvoiceNumberID })
    </td>
</tr>
}
<input type='hidden' id='id' name='id' value='0' />
}
</table>
<br />

<p><i>Select or type in a custom amount to confirm as paid:</i>
</p>
<table>
<tr><td><b>Monthly Amounts:</b></td><td><b>Weekly Amounts:</b></td></tr>
<tr><td>Private Lesson (1 Hour) @Html.RadioButton("InvoiceAmount", "640", true) R640.00<br  /></td><td>Private Lesson (1 Hour) @Html.RadioButton("InvoiceAmount", "160", true) R160.00<br /> </td></tr>
<tr><td>Private Lesson (1/2 Hour) @Html.RadioButton("InvoiceAmount", "350", true) R350.00<br  /></td><td>Private Lesson (1 Hour) @Html.RadioButton("InvoiceAmount", "87.50", true) R87.50<br  /></td></tr>
<tr><td>Group Lesson (1 Hour) @Html.RadioButton("InvoiceAmount", "460", true) R460.00</td>  <td>Private Lesson (1 Hour) @Html.RadioButton("InvoiceAmount", "115", true) R115.00<br /></td> </tr>
<tr><td>Custom Amount @Html.RadioButton("InvoiceAmount", "115", true)  @Html.TextBox("customAmount")<br /></td></tr>
</table>

<script type='text/javascript'>
    $('.select').click(function(){
            $('#id').val($(this).attr('data-id'));
                 alert($('#id').val());
             });
</script>

Confirm Payment

And the code in the controller is:

    public ActionResult Confirm(int id, long InvoiceAmount)
    {
        Invoices invoices = db.Invoice.Find(id);
        //now validate that if the logged in user is authorized to select and confirm this invoice or not.


        if (InvoiceAmount != invoices.InvoiceAmount)
        {
            invoices.InvoiceStatus = "Partly Paid";

        }
        else
        {
            invoices.InvoiceStatus = "Confirmed";
        }
        db.Entry(invoices).State = EntityState.Modified;
        db.SaveChanges();

        return View();
    }

The javascript alert shows the right ID that I select, but when I click Confirm, it doesn't find the ID. Can anyone see where I'm going wrong?

Thanks, Amy

Answer 1

1) For the postback to work, you need to submit your form properly, for instance have a submit button inside your form;
2) For adding a new entry to the ClientPayments table, you do something along the line of

if (InvoiceAmount != invoices.InvoiceAmount)
{
    invoices.InvoiceStatus = "Partly Paid";
}
else
{
    invoices.InvoiceStatus = "Confirmed";
}
db.Entry(invoices).State = EntityState.Modified;

var clientPayment = new ClientPayment();
// Set clientPayment properties
db.ClientPayments.Add(clientPayment);

db.SaveChanges();