我在这里要做的是将DataGridComboBoxColumn的Itemsource数据绑定到声明为项目视图模型属性的字符串集合。 Datagrid本身绑定到另一个viewmodel,该viewmodel有一个viewModel集合,表示datagrid上的行。 我所有其他绑定都能正常工作。该系列也已填满,但组合框仍为空。
XAML:
<Window.Resources>
<ResourceDictionary>
<local:GeneralDataGridViewModel x:Key="generalDataGridVm"/>
</ResourceDictionary>
</Window.Resources>
<Grid>
<DataGrid DataContext="{StaticResource generalDataGridVm}"
ItemsSource="{Binding Collection}">
<DataGrid.Columns>
<DataGridComboBoxColumn x:Name="chbCodes"
Header="Code"
ItemsSource="{Binding Path=DataContext.Collection, UpdateSourceTrigger=PropertyChanged, Mode=TwoWay}" />
</DataGrid.Columns>
</DataGrid>
</Grid>
C#ItemViewModel:
public class ItemViewModel : INotifyPropertyChanged
{
private ObservableCollection<string> _collection;
public ObservableCollection<string> Collection
{
get
{
return _collection;
}
}
public Model Model { get; set; }
public string Code
{
get { return Model.Code; }
set { Model.Code = value; }
}
public ItemViewModel()
{
}
public ItemViewModel(Model model)
{
Model = model;
_collection = new ObservableCollection<string>();
_collection.Add(model.Code);
Model.PropertyChanged += Model_PropertyChanged;
}
public void Model_PropertyChanged(object sender, PropertyChangedEventArgs e)
{
}
}
c#DataGridViewModel:
public class GeneralDataGridViewModel
{
private ObservableCollection<ItemViewModel> _collection;
public ObservableCollection<ItemViewModel> Collection
{
get { return _collection; }
set
{
_collection = value;
NotifyPropertyChanged("Collection");
}
}
public event PropertyChangedEventHandler PropertyChanged;
protected void NotifyPropertyChanged(String property)
{
if (PropertyChanged != null)
{
PropertyChanged(this, new PropertyChangedEventArgs(property));
}
}
public GeneralDataGridViewModel()
: base()
{
_collection = new ObservableCollection<ItemViewModel>();
}
public GeneralDataGridViewModel(List<Model> models)
{
_collection = new ObservableCollection<ItemViewModel>((from m in models
select new ItemViewModel(m)).ToList());
}
}
C#型号:
public class Model: INotifyPropertyChanged
{
public string Code { get; set; }
public string Name { get; set; }
public string Description { get; set; }
public event PropertyChangedEventHandler PropertyChanged;
public void NotifyPropertyChanged(String property)
{
if (PropertyChanged != null)
{
PropertyChanged(this, new PropertyChangedEventArgs(property));
}
}
public override string ToString()
{
return Code;
}
}
答案 0 :(得分:0)
您发布的代码无法编译,但查看该问题可能与数据上下文有关,您将其设置为静态资源。如果要执行此操作,视图模型必须位于资源字典中。 XAML中的绑定很好,请参阅下面的示例:
XAML:
<Window.Resources>
<ResourceDictionary>
<local:GeneralDataGridViewModel x:Key="generalDataGridVm"/>
</ResourceDictionary>
</Window.Resources>
<StackPanel Orientation="Vertical">
<DataGrid DataContext="{StaticResource generalDataGridVm}" Name="DataGrid1" ItemsSource="{Binding Collection}">
<DataGrid.Columns>
<DataGridComboBoxColumn x:Name="chbCodes"
Header="Code"
ItemsSource="{Binding Path=DataContext.Collection, UpdateSourceTrigger=PropertyChanged, Mode=TwoWay}" />
</DataGrid.Columns>
</DataGrid>
</StackPanel>
通过在XAML中声明generalDataGridVm,在XAML中调用构造函数,让我们假设构造提供了集合的值:
public GeneralDataGridViewModel() : base()
{
_collection = new ObservableCollection<ItemViewModel>();
_collection.Add(new ItemViewModel(new Model("code1")));
_collection.Add(new ItemViewModel(new Model("code2")));
_collection.Add(new ItemViewModel(new Model("code3")));
_collection.Add(new ItemViewModel(new Model("code4")));
}
使用此代码,它会生成一个填充的列表:
所以我认为你只需要确保你正确地声明你的视图模型(我建议不要在XAML中创建它,除非有一个很好的理由)。
然后确保在视图模型的特定实例中正确更新集合。