Bind ListView to ArrayList and Display

Question

I don't usually work with these types of controls, so I could be completely on the wrong track here..

The end goal is to have a dataset of records with ProductTitle, ProductURL and ProductDescription. Then have those records displayed in a 3 column format, with additional rows if needed. For example:

records 1, 2, 3, 4, 5 ,6 and 7 should show

The error I'm getting is

System.Web.HttpException: DataBinding: 'System.Web.UI.WebControls.ListItem' does not contain a property with the name 'ProductTitle'.

The Front-End side:

<div>
    <asp:ListView ID="ListView1" runat="server" GroupItemCount="3" OnLoad="ListView1_Load">

        <LayoutTemplate>
            <table>
                <tr>
                    <td>
                        <table border="0" cellpadding="5">
                            <asp:PlaceHolder runat="server" ID="groupPlaceHolder"></asp:PlaceHolder>
                        </table>
                    </td>
                </tr>
            </table>
        </LayoutTemplate>

        <GroupTemplate>
            <tr>
                <asp:PlaceHolder runat="server" ID="itemPlaceHolder"></asp:PlaceHolder>
            </tr>
        </GroupTemplate>

        <ItemTemplate>
            <td>
                <div>
                    <div><%#Eval("ProductTitle")%></div>
                    <img alt="Test Image" src="<%#Eval("ProductURL")%>" />
                    <div><%# Eval("ProductDescription")%></div>
                </div>
            </td>
        </ItemTemplate>

    </asp:ListView>  
</div>

I've got my Code-Behind:

Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load

End Sub


Protected Sub ListView1_Load(sender As Object, e As EventArgs)
    Dim myPaaams As ArrayList = New ArrayList

    myPaaams.Add(New ListItem("ProductTitle", "Adams Test"))
    myPaaams.Add(New ListItem("ProductURL", "Adams Test"))
    myPaaams.Add(New ListItem("ProductDescription", "Adams Test"))

    ListView1.DataSource = myPaaams
    ListView1.DataBind()
End Sub

I've also tried the following code for my ListView Load event, but this fails with the same error.

Protected Sub ListView1_Load(sender As Object, e As EventArgs)
    Dim myParams As ArrayList = New ArrayList

    Dim variable As New Dictionary(Of String, String) From {{"ProductTitle", "Adams Test"}, _
                                                            {"ProductURL", "value2"}, _
                                                            {"ProductDescription", "value2"}}

    myParams.Add(variable)

    ListView1.DataSource = myParams
    ListView1.DataBind()
End Sub

jmoreno · Accepted Answer · 2014-04-08 02:02:11Z

1

You need to use a class, such as

Public Class Products
    Public Property ProductTitle As String
    Public Property ProductURL as String
    Public Property ProductDescription as String
End Class


Protected Sub ListView1_Load(sender As Object, e As EventArgs)
    Dim myParams As BindingList(of Products)= New BindingList(of Products)

    Dim p as Products = New Products With {.ProductTitle = "Title", 
                                         .ProductURL = "URL",
                                         .ProductDescription="Description"}

    myParams.Add(p)
    ListView1.DataSource = myParams
    ListView1.DataBind()
End Sub

The reason why what you are trying isn't working, is because you are trying to manually create a new list item, and then bind against it -- that won't work, as the list item doesn't have the right properties.

edited Apr 8, 2014 at 2:02

answered Apr 7, 2014 at 21:21

jmoreno

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5 Comments

adam Over a year ago

Just tried this, but I still get the same error message. The error occurs on ListView1.DataBind()

jmoreno Over a year ago

I fixed the typos in my code, copied your aspx code into a new project (editted to change img to div) and pasted my code into the codebehind--works (after adding import for bindinglist).

adam Over a year ago

Does it make a difference that this is an ASCX and not an ASPX? We work in DNN and all code is done in separate modules / controls, instead of full pages.

adam Over a year ago

Nevermind, I copied your revised code in and it works just fine. I thought I had fixed the typos myself but apparently not. Thank you for the help!!!

jmoreno Over a year ago

You're welcome. I'd add that ArrayList is a relic of .Net 1.0, and I wouldn't recommend using it for anything new. It may not make much of a difference in this particular scenario (using eval on the otherside), but still...Apologizes for the typos, iPads are great, but do have some limitations.

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