[英]Binding DataGridComboBoxColumn
I am trying to bind ObservableCollection of T to DataGridComboBoxColumn of DataGrid. 我正在尝试将T的ObservableCollection绑定到DataGrid的DataGridComboBoxColumn。
DataGrid definition is : DataGrid的定义是:
<DataGrid AutoGenerateColumns="False" ItemsSource="{Binding Model, IsAsync=True}">
<DataGrid.Columns>
<DataGridTextColumn Header="Column Entry" IsReadOnly="True" Binding="{Binding ColumnName}"/>
<DataGridComboBoxColumn Header="Road Type" ItemsSource="{Binding RoadTypes}"/>
</DataGrid.Columns>
</DataGrid>
This is ViewModel and Model 这是ViewModel和Model
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
var viewModel = new ViewModel();
DataContext = viewModel;
}
}
public class ViewModel : ViewModelBase
{
private ObservableCollection<Model> _model;
public ViewModel()
{
var list = new List<Model>();
var roadTypes = new ObservableCollection<RoadType>
{
new RoadType
{
Code = 1,
Id = 1,
Name = "Name1"
},
new RoadType
{
Code = 1,
Id = 1,
Name = "Name1"
}
};
Model = new ObservableCollection<Model>
{
new Model
{
ColumnName = "Col1",
RoadTypes = roadTypes
},
new Model
{
ColumnName = "Col1",
RoadTypes = roadTypes
}
};
}
public ObservableCollection<Model> Model
{
get { return _model; }
set
{
_model = value;
RaisePropertyChanged(() => Model);
}
}
}
public class RoadType
{
public int Id { get; set; }
public int Code { get; set; }
public string Name { get; set; }
}
public class Model : ObservableObject
{
private ObservableCollection<RoadType> _roadTypes;
public string ColumnName { get; set; }
public ObservableCollection<RoadType> RoadTypes
{
get { return _roadTypes; }
set
{
_roadTypes = value;
RaisePropertyChanged(() => RoadTypes);
}
}
}
DataGrid displays text column as well but it doesn't display ComboBox values. DataGrid也显示文本列,但不显示ComboBox值。
What's wrong? 怎么了?
Since RoadTypes isn't a simple list of strings you need to tell your combobox what property it needs to display in the ComboBox. 由于RoadTypes不是一个简单的字符串列表,您需要告诉您的组合框需要在ComboBox中显示哪些属性。 Try adding
尝试添加
DisplayMemberPath="Name"
to your combobox declartion 到您的组合框声明
-- -
Update: 更新:
Okay, this is a known "feature" with WPF datagrids. 好的,这是WPF数据网格的已知“功能”。 The issue is that the DataGridComboBox doesn't have the DataContext of the DataGrid.
问题是DataGridComboBox没有DataGrid的DataContext。 I modified the binding for the ComboBox to look like this:
我修改了ComboBox的绑定,如下所示:
<DataGridComboBoxColumn DisplayMemberPath="Name">
<DataGridComboBoxColumn.ElementStyle>
<Style>
<Setter Property="ComboBox.ItemsSource" Value="{Binding Path=RoadTypes}" />
</Style>
</DataGridComboBoxColumn.ElementStyle>
<DataGridComboBoxColumn.EditingElementStyle>
<Style>
<Setter Property="ComboBox.ItemsSource" Value="{Binding Path=RoadTypes}" />
</Style>
</DataGridComboBoxColumn.EditingElementStyle>
</DataGridComboBoxColumn>
I modified the code you provided in your download link and the combobox items were displayed when I opened the combobox dropdown. 我修改了您在下载链接中提供的代码,并在打开组合框下拉列表时显示了组合框项目。
Check out some of these links for further clarification: 请查看以下一些链接,以进一步说明问题:
http://social.msdn.microsoft.com/Forums/en-US/wpf/thread/b4b13a72-47f9-452f-85c6-6c4b5b606df5/ http://social.msdn.microsoft.com/Forums/en-US/wpf/thread/b4b13a72-47f9-452f-85c6-6c4b5b606df5/
How to bind collection to WPF:DataGridComboBoxColumn 如何将集合绑定到WPF:DataGridComboBoxColumn
Excedrin headache #3.5.40128.1: Using combo boxes with the WPF DataGrid Excedrin头痛#3.5.40128.1:使用带有WPF DataGrid的组合框
What led me to look at all of these sites is looking at the Output window and noticing the error message System.Windows.Data Error: 2 : Cannot find governing FrameworkElement or FrameworkContentElement for target element. 让我看看所有这些站点的原因是查看“输出”窗口并注意到错误消息System.Windows.Data错误:2:无法找到目标元素的管理FrameworkElement或FrameworkContentElement。 message
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