WPF DataGrid ComboBox SelectedItem属性设置器 [英] WPF DataGrid ComboBox SelectedItem Property Setter

问题描述

我正在寻找一个示例，该示例如何在WPF DataGrid中的组合框内使用SelectedItem属性

I am looking for an example of how to use the SelectedItem property inside a combobox in a WPF DataGrid, I have

<DataGridComboBoxColumn SelectedValueBinding="{Binding CID, UpdateSourceTrigger=PropertyChanged, Mode=TwoWay}" 
                        SelectedValuePath="CID"  
                        Header="CID" 
                        Width="70">
        <DataGridComboBoxColumn.EditingElementStyle>
            <Style TargetType="ComboBox">
                <Setter Property="ItemsSource" Value="{Binding DataContext.ListCustomerCollection, 
                  RelativeSource={RelativeSource Mode=FindAncestor, AncestorType=Window}}"/>
                <Setter Property="DisplayMemberPath" Value="Name"/>
                <Setter Property="SelectedItem" Value="{Binding DataContext.Customer, RelativeSource={RelativeSource Mode=FindAncestor,AncestorType=Window}}"></Setter> 
            </Style>
        </DataGridComboBoxColumn.EditingElementStyle>
        <DataGridComboBoxColumn.ElementStyle>
            <Style TargetType="ComboBox">
                <Setter Property="ItemsSource" Value="{Binding DataContext.ListCustomerCollection, RelativeSource={RelativeSource Mode=FindAncestor, AncestorType=Window}}"/>
                <Setter Property="DisplayMemberPath" Value="Name"/>
                <Setter Property="HorizontalAlignment" Value="Center"></Setter>
                <Setter Property="SelectedItem" Value="{Binding DataContext.Customer, RelativeSource={RelativeSource Mode=FindAncestor,AncestorType=Window}}"></Setter>
            </Style>
        </DataGridComboBoxColumn.ElementStyle>

我绑定到(ListCustomerCollection)的DataContext是一个List对象

The DataContext I bind to (ListCustomerCollection) is a List object

  List<Customer> 

所以我在ViewModel属性中设置的属性是

so the property in the ViewModel property I have set is

private Customer m_Customer = null;
public Customer Customer
{
    get { return m_Customer; }
    set
    {
        m_Customer = value;
        OnPropertyChanged("Customer");
    }
}

那么我该如何编写XAML以使用SelectedItem设置上述属性?

So how do I writethe XAML to set the above property with the SelectedItem?

推荐答案

如果属性位于窗口的ViewModel中，则必须像对ItemsSource一样获取窗口的DataContext.

If property resides in window's ViewModel, you have to get window's DataContext like you did for ItemsSource.

<Setter Property="SelectedItem"
        Value="{Binding DataContext.Customer,
                        RelativeSource={RelativeSource Mode=FindAncestor, 
                                                 AncestorType=Window}}"/>

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