WPF bind comboBox to List<string>

Question

I'm trying to programmatically generate combo box items. I'm very new to WPF and don't understand where I'm making a mistake.

This is my List<string>:

public class StatusList : List<string>
{
    public StatusList()
    {
        this.Add("aaa");
        this.Add("bbb");
        this.Add("ccc");
        this.Add("ddd");
    }
}

And I'm trying to show these items in

<DataTemplate>
    <ComboBox Height="22" ItemsSource="{StaticResource StatusList}" SelectedItem="{Binding Status}" />
</DataTemplate>

But ItemsSource="{StaticResource StatusList}" is not recognized

also, instead of ItemsSource="{StaticResource StatusList}" try ItemsSource="{Binding StatusList}" — Sudsy1002
– Sudsy1002, Commented Feb 28, 2018 at 13:03
@Sudsy1002 Thanks for tips. ItemsSource="{Binding StatusList}" do not work, I'll look at obervableCollection — Kajbo
– Kajbo, Commented Feb 28, 2018 at 13:06

Clemens · Accepted Answer · 2018-03-01 12:11:20Z

4

You need to first set the DataContext property of your MainWindow, which will provide a default source object for any Bindings where a source is not explictly set (by setting either Source, RelativeSource or ElementName).

The object held by the DataContext is typically called a view model.

Your view model should have a public property Statuses which returns a List<string>

Then in XAML you can declare ItemsSource="{Binding Statuses}"

Statuses may also be declared as ObservableCollection<string> in case you want the UI to updated when elements are added or removed.

edited Mar 1, 2018 at 12:11

Clemens

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answered Feb 28, 2018 at 13:11

rahulaga-msft

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2 Comments

Kajbo Over a year ago

Can you elaborate a little more on ViewModel? How can I set it?

rahulaga-msft Over a year ago

Basically ViewModel we refer more in context of MVVM pattern. Let it be some class say EmployeeViewModel. You can set datacontext for your view in your code behind .cs file constructor as this.DataContext=new EmployeeViewModel() 'EmployeeViewModel' is expected to expose public property say Statuses which can return List<string>

ASh · Accepted Answer · 2018-02-28 13:19:19Z

1

{StaticResource StatusList} - StatusList here is not type name, it is a resource key.

for {StaticResource} to work it should be defined somethere:

<Window.Resources>
   <local:StatusList x:Key="StatusList"/>
</Window.Resources>

local is an alias for namespace where StatusList is declared. local should be declared in xaml using xmlns

answered Feb 28, 2018 at 13:19

ASh

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2 Comments

Kajbo Over a year ago

stupid question, but Where can I use <Window.Resources> without getting an error? I tried to add it to <Grid.Resources> before asking a question, but it is not recognized.

Kajbo Over a year ago

Even if I add <Window.Resources> after <Grid> tag, the warning appears that I'm missing assembly reference.

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