C#/ WPF:将Datagrid中的Combobox ItemSource绑定到DataContext外部的元素

Question

我想做以下事情:

public List<Users> PreLoadedUserList { get; set; }
public List<RowEntries> SomeDataRowList { get; set; }

public class Users
{
    public int Age { get; set; }
    public string Name { get; set; }
}
public class SomeDataRowList 
{
    public int UserAge { get; set;
}

现在我的(WPF Toolkit)DataGrid看起来像这样:

<my:DataGrid AutoGenerateColumns="False" MinHeight="200" 
             ItemsSource="{Binding Path=SomeDataRowList}">
    <my:DataGridComboBoxColumn Header="Age" 
                               ItemsSource="{Binding Path=PreLoadedUserList}" 
                               DisplayMemberPath="Name" 
                               SelectedValueBinding="{Binding Path=UserAge}"/>

</my:DataGrid>

现在我的问题是,PreLoadedUserList在ItemSource(SomeDataRowList)之外,我不知道如何绑定到它之外的东西.我真正想要它: - 在ComboBox中显示PreLoadedUserList - 将(RowEntries)SelectedItem.UserAge的值设置为所选ComboboxItem.Age的值

如果我的解释太奇怪,请告诉我:-)

谢谢,干杯

Answer 1

开始了 :-)

<my:DataGridTemplateColumn Header="SomeHeader">
    <my:DataGridTemplateColumn.CellTemplate>
        <DataTemplate>
            <ComboBox SelectedValuePath="UserAge" 
                SelectedValue="{Binding Age}" 
                DisplayMemberPath="Name" 
                ItemsSource="{Binding Path=DataContext.PreLoadedUserList, 
                    RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type Window}}}" 
                IsReadOnly="True" Background="White" />
        </DataTemplate>
    </my:DataGridTemplateColumn.CellTemplate>
</my:DataGridTemplateColumn>

希望这也可以帮助其他人.

干杯