我们如何绑定到当前数据上下文的父级/兄弟节点(即代表当前数据上下文的源属性)?我不是在谈论绑定到父控件的属性(这种情况涉及目标的父项而不是源的父项),可以通过使用RelativeSourceMode = FindAncestor轻松完成。RelativeSourceMode = PreviousData提供了有限的支持,可以绑定到数据项的前一个兄弟,但不能绑定到父级或其他兄弟节点。
虚拟示例: (假设已经实现了INPC) 如何将ComboBox的ItemsSource绑定到ViewModel的Departments属性?
虚拟示例: (假设已经实现了INPC) 如何将ComboBox的ItemsSource绑定到ViewModel的Departments属性?
public class Person
{
public string Name { get; set; }
public string Department { get; set; }
}
public class PersonViewModel
{
public List<Person> Persons { get; set; }
public List<string> Departments { get; set; }
public PersonViewModel()
{
Departments = new List<string>();
Departments.Add("Finance");
Departments.Add("HR");
Departments.Add("Marketing");
Departments.Add("Operations");
Persons = new List<Person>();
Persons.Add(new Person() { Name = "First", Department = "HR" });
Persons.Add(new Person() { Name = "Second", Department = "Marketing" });
Persons.Add(new Person() { Name = "Third", Department = "Marketing" });
}
}
XAML:
<Window x:Class="WpfApplication1.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="clr-namespace:WpfApplication1"
Title="MainWindow" Height="300" Width="300">
<Grid>
<DataGrid ItemsSource="{Binding Persons}" AutoGenerateColumns="False">
<DataGrid.Columns>
<DataGridTextColumn Header="Name" Binding="{Binding Name}" />
<DataGridTemplateColumn>
<DataGridTemplateColumn.CellTemplate>
<DataTemplate>
<ComboBox ItemsSource="{Binding Departments???}"
SelectedValue="{Binding Department}"/>
</DataTemplate>
</DataGridTemplateColumn.CellTemplate>
</DataGridTemplateColumn>
</DataGrid.Columns>
</DataGrid>
</Grid>
</Window>
{Binding DataContext.Departments, RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type DataGrid}}}
不是你想要的吗? - Markus Hütter