CODEWITHSUNDEEP
wpflistitemscontrol
Joseph jun. Melettukunnel
Joseph jun. Melettukunnel

Reputation: 6397

WPF Error: "Items collection must be empty before using ItemsSource."

Does anyone know why I keep getting the "Items collection must be empty before using ItemsSource"-Error?

Here is the code: 

        <ScrollViewer Margin="8,8,8,8" Grid.Row="3" HorizontalScrollBarVisibility="Auto" VerticalScrollBarVisibility="Disabled">                  
                <WrapPanel Orientation="Vertical">
                    <ItemsControl ItemsSource="{Binding}" x:Name="CustomerList" >>
                        <ItemsControl.ItemsPanel>
                            <ItemsPanelTemplate>
                                <WrapPanel Orientation="Horizontal">
                                </WrapPanel>
                            </ItemsPanelTemplate>
                        </ItemsControl.ItemsPanel>
                        <ItemsControl.ItemTemplate>
                            <DataTemplate>
                                <View:UserControlCustomerDetails>
                                </View:UserControlCustomerDetails>
                            </DataTemplate>
                        </ItemsControl.ItemTemplate>
                    </ItemsControl>
                </WrapPanel>
            </ScrollViewer>

This is what I do in my Code-Behind: 

 CustomerList.ItemsSource = _mainViewModel.CustomerCollection;

Note that CustomerCollection is just a simple List<Customers>.

Thanks for your help!

Cheers

Upvotes: 2

Views: 18033

Answers (4)

user2202026
user2202026

Reputation: 11

Use DataGrid.Items.Clear(); I hope it will be Helpfull...

Upvotes: 1

Joe White
Joe White

Reputation: 97848

Is this code copied verbatim? Do you really have two right angle brackets (>>) at the end of the <ItemsControl... line? If so, the second right angle bracket might be getting treated as text content, which is getting added to the Items collection.

Upvotes: 14

Thomas Levesque
Thomas Levesque

Reputation: 292725

Apparently you're using the MVVM pattern. In that case you shouldn't explicitly assign a collection to the ItemsSource property... instead, you should assign a ViewModel to the DataContext of the Window (or UserControl). If your DataContext is _mainViewModel, your binding should be :

<ItemsControl ItemsSource="{Binding CustomerCollection}" ...

Upvotes: 2

Will Eddins
Will Eddins

Reputation: 13917

First, remove ItemsSource="{Binding}" from your ItemsControl. This should fix your error i believe.

Secondly, I'm not sure if your WrapPanel is going to work as expected in this case. From my understanding, WrapPanel will do wrapping when it has multiple children that extend out of bounds. In this case, your WrapPanel only has 1 child, an ItemsControl.

Upvotes: 2

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