WPF IsEditable=true ComboBox filled with objects d

问题:

The Wpf combo box allows editing, and this is fine if all your combo box items are strings, or have a ToString() method defined on them.

When you select an item, it is displayed as Text, it does not use a DataTemplate, it just calls ToString() on the item that is selected.

I get a list of items in my combo drop down that are formatted using my item template, when i select one i get the name of the object i.e. MyNamespace.MyObjectName

Some solutions have been

• use ValuePath to bind to a property on the object, but if you require your display to be more than one of these, bad luck.
• implement the ToString() method on your object

is there another way around?

回答1:

You can do this entirely within Xaml

<ComboBox IsTextSearchEnabled="True" IsEditable="True"
        ItemsSource="{Binding MyObjectCollection}"
        TextSearch.TextPath="MyObjectName">
    <ComboBox.ItemTemplate>
        <DataTemplate>
            <TextBlock Text="{Binding MyObjectName}" />
        </DataTemplate>
     </ComboBox.ItemTemplate>
</ComboBox>

The upside is that you can define and change this however you want in your XAML without any code-behind. You bind the ItemsSource to your collection of objects, and then you set the path on which to base your search to TextSearch.TextPath. Then, within you custom ItemTemplate you can bind the TextBlock to something else outside of the object's ToString method.

回答2:

You can use an IValueConverter to convert the "object" to a string value and back. See the example code in the IValueConverter link for details.