ansaurus

Question

Answer 1

+2 A:

In your C# code, you can do something like this:

myListBox.ItemsSource = myTextBoxesCollection;

Or in your XAML code:

<ListBox ItemsSource="{Binding MyTextBoxesCollection}">
    <ListBox.ItemTemplate>
        <DataTemplate>
            <TextBox Text="{Binding Text}" />
        </DataTemplate>
    </ListBox.ItemTemplate>
</ListBox>

For the XAML, MyTextBoxesCollection needs to be a public property on your data context. One way to set the DataContext could be, in your constructor:

DataContext = this;

chrensli 2010-06-04 13:08:46

I don't think this will work. MyListBox should be ListBox, for one. And in answer to your suspicion, it does not need to be a dependency property.

Eric Mickelsen 2010-06-04 13:16:21

My original post needed work, so it is rewritten.

chrensli 2010-06-04 13:35:15

if I do this, it tells my: System.InvalidOperationException: Items collection must be empty before using ItemsSource.even though I actually do assign it before I add textboxes.

Blub 2010-06-04 13:55:25

When using an ItemsControl you must use either the Items property or the ItemsSource property, you can't use both at the same time. Make sure you aren't setting the content of the ListBox like this: <ListBox .... ... all that crap I show above ... <SomeItem /> <SomeItem /> </ListBox>And make sure you aren't adding anything to the Items collection in your code behind either.

chrensli 2010-06-04 14:00:09

This works, THANK YOU. Every other answer was wrong.

Blub 2010-06-07 05:30:46

@Blurb: Still, I question why you are creating a collection of text boxes, and then binding the Text properties of them to a ListBox to create new TextBoxes. Is this really what you want? Or do you want a collection of strings?

Brian Genisio 2010-06-08 09:31:59

Answer 2

+1 A:

Make MyTextBoxCollection (your ObservableCollection of textboxes) a public property of your DataContext.

<ListBox ItemsSource=”{Binding MyTextBoxCollection}”>
  <ListBox.ItemTemplate>
    <DataTemplate><TextBox Text=”{Binding Text}” /></DataTemplate>
  </ListBox.ItemTemplate>
</ListBox>

Eric Mickelsen 2010-06-04 13:14:00

Hm, doesn't seem to work. My listbox only shows "System.Windows.DataTemplate" in a single row. I'm adding this in the UserControl constructor though:TextBox temp = new TextBox();temp.Text = "Test";collectedTodos.Add(temp);Following error:System.Windows.Data Error: 40 : BindingExpression path error: 'mycollection' property not found on 'object' ''MyControl' (Name='Window')'. BindingExpression:Path=mycollection; DataItem='MyControl' (Name='Window'); target element is 'ListBox' (Name='Test2'); target property is 'ItemsSource' (type 'IEnumerable')

Blub 2010-06-04 13:37:28

@Blub: change your ItemsSource like this `<ListBox ItemsSource=”{Binding collectedTodos}”>`. Wrap the `<DataTemplate><TextBox Text=”{Binding Text}” /></DataTemplate>` block with `<ListBox.ItemTemplate>` as in Brian's answer.

Veer 2010-06-04 13:48:26

You are missing <ListBox.ItemTemplate> between the ListBox and DataTemplate

Brian Genisio 2010-06-04 13:50:52

I still get the same error and nothing shows up in the listbox. I also get these: System.Windows.Data Error: 4 : Cannot find source for binding with reference 'RelativeSource FindAncestor, AncestorType='Microsoft.VisualStudio.PlatformUI.VsToolBar', AncestorLevel='1''. BindingExpression:Path=DataContext.DockLocation; DataItem=null; target element is 'VsMenuItem' (Name=''); target property is 'NoTarget' (type 'Object')

Blub 2010-06-04 14:08:04

@Brian: D'oh! Good call.

Eric Mickelsen 2010-06-04 14:09:19

This does NOT work. Two-way binding requires Path or XPath.

Blub 2010-06-07 05:28:33

@Blub: What do you mean? My answer is nearly identical to the accepted one.

Eric Mickelsen 2010-06-07 05:46:45

Answer 3

+2 A:

Having an ObservableCollection<TextBox> is alomost always the wrong approach. You likely want an ObservableCollection<string> instead.

Then, in your ListBox (or ItemsCollection) you have the following code:

<ListBox ItemsSource="{Binding MyStrings}">
    <ListBox.ItemTemplate>
        <DataTemplate>
            <TextBox Text="{Binding .}" />
        </DataTemplate>
    </ListBox.ItemTemplate>
</ListBox>

Brian Genisio 2010-06-04 13:25:40

I think you need to edit your question to format `ObservableCollection<TextBox>` and `ObservableCollection<String>` as the first line has no meaning in it.

Veer 2010-06-04 13:29:33

This does NOT work. I have tried this in every concievable way. Please create a WPF project yourself and try this.

Blub 2010-06-07 05:24:54

Sorry... I missed the '.' in the {Binding .}

Brian Genisio 2010-06-08 09:29:32

ansaurus

tags:

views:

answers:

Binding a collection to Listbox

related questions