我面临WPF DataGrid复选框C＃的问题。
当选择标题模板复选框时，我没有找到选择所有单元格模板复选框的方法。在viewmodel中它的工作正常。它得到全选，但在视图中没有在选中的标头复选框上显示任何选定的复选框符号/标记。我遇到的问题与DataGrid（WPF）中的复选框有关
click this link I want to do same like this 我的XAML代码：
<DataGrid x:Name="DgLines" ItemsSource="{Binding OpcUaEndpoints}"
MouseDoubleClick="DgLines_MouseDoubleClick" SelectionMode="Extended"
DataContext="{Binding}" IsReadOnly="True" Grid.ColumnSpan="5">
<DataGrid.Columns>
<DataGridTemplateColumn
<DataGridTemplateColumn.HeaderTemplate>
<DataTemplate>
<CheckBox Name="ckbSelectedAll" Checked="ckbSelectedAll_Checked" Unchecked="ckbSelectedAll_Unchecked"
IsChecked="{Binding IsSelected, UpdateSourceTrigger=PropertyChanged}"></CheckBox>
</DataTemplate>
</DataGridTemplateColumn.HeaderTemplate>
<DataGridTemplateColumn.CellTemplate>
<DataTemplate>
<CheckBox Name="cbkSelect" Checked="cbkSelect_Checked" Unchecked="cbkSelect_Unchecked"
IsChecked="{Binding IsSelected, UpdateSourceTrigger=PropertyChanged}"/>
</DataTemplate>
</DataGridTemplateColumn.CellTemplate>
</DataGridTemplateColumn>
<!--<DataGridTextColumn Width="200" Header="Id" Binding="{Binding Id }" />-->
<DataGridTextColumn Width="200" Header="Name" Binding="{Binding Name}"/>
<DataGridTextColumn Width="500" Header="Description" Binding="{Binding Description}"/>
<DataGridTextColumn Width="500" Header="Lines" Binding="{Binding Endpoint}"/>
</DataGrid.Columns>
</DataGrid>
ViewModelCode：
private void ckbSelectedAll_Unchecked(object sender, RoutedEventArgs e)
{
// this.DgLines.UnselectAll();
foreach (AddLinesViewModel c in DgLines.ItemsSource)
{
c.IsSelected = false;
}
}
private static OpcUaEndpointsListViewModel _instance;
private static readonly object Padlock = new object();
private ICommand _addCommand;
private ICommand _uncheckCommand;
private ICommand _searchcommand;
private ObservableCollection<AddOpcUaEndpointsViewModel> _endpoint;
public string _charNameFromTB;
public OpcUaEndpointsListViewModel()
{
BindDataGrid();
}
public static OpcUaEndpointsListViewModel Instance
{
get
{
lock (Padlock)
{
return _instance ?? (_instance = new OpcUaEndpointsListViewModel());
}
}
}
/// <summary>
/// //OPC UA Endpoint List
/// </summary>
public ObservableCollection<AddOpcUaEndpointsViewModel> OpcUaEndpoints
{
get => _endpoint;
set
{
if (OpcUaEndpoints == value)
{
_endpoint = value;
OnPropertyChanged("OpcUaEndpoints");
}
}
}
public string CharNameFromTB
{
get { return _charNameFromTB; }
set
{
_charNameFromTB = value;
OnPropertyChanged("CharNameFromTB");
}
}
public ICommand AddCommand
{
get { return _addCommand ?? (_addCommand = new RelayCommand(p => ExecuteAddCommand())); }
}
public ICommand SearchCommand
{
get { return _searchcommand ?? (_searchcommand = new RelayCommand(p => ExecuteSearchCommand())); }
}
private void ExecuteSearchCommand()
{
BindDataGridsearch();
}
private void BindDataGrid()
{
var opcendptsModel = opcUaEndpointsService.GetAll();
_endpoint = new ObservableCollection<AddOpcUaEndpointsViewModel>(opcendptsModel.Select(p => new AddOpcUaEndpointsViewModel(p)));
}
答案 0 :(得分：2)
请找到工作代码。我已经对您的代码进行了修改
<DataGrid x:Name="DgLines" ItemsSource="{Binding OpcUaEndpoints}" AutoGenerateColumns="False"
SelectionMode="Extended" IsReadOnly="True" Grid.ColumnSpan="5">
<DataGrid.Columns>
<DataGridTemplateColumn>
<DataGridTemplateColumn.HeaderTemplate>
<DataTemplate>
<CheckBox Name="ckbSelectedAll"
IsChecked="{Binding IsSelected, UpdateSourceTrigger=PropertyChanged}">
<i:Interaction.Triggers>
<i:EventTrigger EventName="Checked" >
<i:InvokeCommandAction Command="{Binding DataContext.CheckedCommand, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type DataGrid}}}" />
</i:EventTrigger>
<i:EventTrigger EventName="Unchecked" >
<i:InvokeCommandAction Command="{Binding DataContext.UncheckedCommand, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type DataGrid}}}" />
</i:EventTrigger>
</i:Interaction.Triggers>
</CheckBox>
</DataTemplate>
</DataGridTemplateColumn.HeaderTemplate>
<DataGridTemplateColumn.CellTemplate>
<DataTemplate>
<CheckBox Name="cbkSelect"
IsChecked="{Binding IsSelected, UpdateSourceTrigger=PropertyChanged}"/>
</DataTemplate>
</DataGridTemplateColumn.CellTemplate>
</DataGridTemplateColumn>
<!--<DataGridTextColumn Width="200" Header="Id" Binding="{Binding Id }" />-->
<DataGridTextColumn Width="200" Header="Name" Binding="{Binding Name}"/>
<DataGridTextColumn Width="500" Header="Description" Binding="{Binding Description}"/>
<DataGridTextColumn Width="500" Header="Lines" Binding="{Binding Endpoint}"/>
</DataGrid.Columns>
</DataGrid>
public class OpcUaEndpointsListViewModel : INotifyPropertyChanged
{
private static OpcUaEndpointsListViewModel _instance;
private static readonly object Padlock = new object();
private ICommand _addCommand;
//private ICommand _uncheckCommand;
private ICommand _searchcommand;
private ICommand _checkedCommand { get; set; }
private ICommand _unCheckedCommand { get; set; }
private ObservableCollection<AddOpcUaEndpointsViewModel> _endpoint;
public string _charNameFromTB;
public event PropertyChangedEventHandler PropertyChanged;
public OpcUaEndpointsListViewModel()
{
BindDataGrid();
}
public static OpcUaEndpointsListViewModel Instance
{
get
{
lock (Padlock)
{
return _instance ?? (_instance = new OpcUaEndpointsListViewModel());
}
}
}
/// <summary>
/// //OPC UA Endpoint List
/// </summary>
public ObservableCollection<AddOpcUaEndpointsViewModel> OpcUaEndpoints
{
get { return _endpoint; }
set
{
if (OpcUaEndpoints == value)
{
_endpoint = value;
OnPropertyChanged("OpcUaEndpoints");
}
}
}
public string CharNameFromTB
{
get { return _charNameFromTB; }
set
{
_charNameFromTB = value;
OnPropertyChanged("CharNameFromTB");
}
}
public ICommand AddCommand
{
get { return _addCommand ?? (_addCommand = new WpfApplication1.RelayCommand<object>(p => ExecuteAddCommand())); }
}
public ICommand SearchCommand
{
get { return _searchcommand ?? (_searchcommand = new RelayCommand<object>(p => ExecuteSearchCommand())); }
}
public ICommand CheckedCommand
{
get { return _checkedCommand ?? (_checkedCommand = new WpfApplication1.RelayCommand<object>(p => ExecuteCheckedCommand())); }
}
public ICommand UncheckedCommand
{
get { return _unCheckedCommand ?? (_unCheckedCommand = new WpfApplication1.RelayCommand<object>(p => ExecuteUnCheckedCommand())); }
}
private void ExecuteSearchCommand()
{
///BindDataGridsearch();
}
private void ExecuteCheckedCommand()
{
foreach (var item in _endpoint)
{
item.IsSelected = true;
}
}
private void ExecuteUnCheckedCommand()
{
foreach (var item in _endpoint)
{
item.IsSelected = false;
}
}
private void ExecuteAddCommand()
{
///BindDataGridsearch();
}
private void BindDataGrid()
{
_endpoint = new ObservableCollection<AddOpcUaEndpointsViewModel>();
_endpoint.Add(new AddOpcUaEndpointsViewModel { Name = "A", Description = "A", Endpoint = 1 });
_endpoint.Add(new AddOpcUaEndpointsViewModel { Name = "B", Description = "B", Endpoint = 2 });
_endpoint.Add(new AddOpcUaEndpointsViewModel { Name = "C", Description = "C", Endpoint = 3 });
_endpoint.Add(new AddOpcUaEndpointsViewModel { Name = "D", Description = "D", Endpoint = 4 });
_endpoint.Add(new AddOpcUaEndpointsViewModel { Name = "E", Description = "E", Endpoint = 5 });
}
public void OnPropertyChanged(string propertyName)
{
PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
}
}
public class AddOpcUaEndpointsViewModel : INotifyPropertyChanged
{
public event PropertyChangedEventHandler PropertyChanged;
public void OnPropertyChanged(string propertyName)
{
PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
}
private string _name;
public string Name
{
get { return _name; }
set { _name = value; OnPropertyChanged("Name"); }
}
private string _description;
public string Description
{
get { return _description; }
set { _description = value; OnPropertyChanged("Description"); }
}
private int _endPoint;
public int Endpoint
{
get { return _endPoint; }
set { _endPoint = value; OnPropertyChanged("Endpoint"); }
}
private bool _isSelected;
public bool IsSelected
{
get { return _isSelected; }
set { _isSelected = value; OnPropertyChanged("IsSelected"); }
}
}