根据依赖于其他属性的属性更新数据网格复选框状态

Question

我有一个模型，它包含CanDrawProperty。我想将此属性绑定到DataGrid CheckBox:的IsEnabled属性

public class Series : INotifyPropertyChanged
{
private ObservableCollection<DropPhoto> _dropPhotosSeries;
public ObservableCollection<DropPhoto> DropPhotosSeries
{
get
{
return _dropPhotosSeries;
}
set
{
_dropPhotosSeries = value;
OnPropertyChanged(new PropertyChangedEventArgs("DropPhotosSeries"));
}
}
private bool _canDrawPlot;
public bool CanDrawPlot
{
get
{
if (_dropPhotosSeries?.Where(x => x.Drop.RadiusInMeters != null).ToList().Count > 1)
{
_canDrawPlot = true;
return _canDrawPlot;
}
_canDrawPlot = false;
return _canDrawPlot;
}
set
{
_canDrawPlot = value;
OnPropertyChanged(new PropertyChangedEventArgs("CanDrawPlot"));
}
}
public event PropertyChangedEventHandler PropertyChanged;
public void OnPropertyChanged(PropertyChangedEventArgs e)
{
PropertyChanged?.Invoke(this, e);
}
}

我想基于此模型的CanDrawPlot属性更新我的Datagrid CheckBox IsEnabled状态。但这似乎不起作用。DataGrid的XAML：

<DataGrid IsReadOnly="True" AutoGenerateColumns="False" SelectionMode="Single" Margin="0" BorderThickness="0" ClipToBounds="True" ItemsSource="{Binding User.UserSeries}" SelectionChanged="SeriesDataGrid_OnSelectionChanged" Name="SeriesDataGrid">
<DataGrid.Columns>
<DataGridTemplateColumn CanUserResize="False">
<DataGridTemplateColumn.CellTemplate>
<DataTemplate>
<CheckBox IsEnabled="{Binding CanDrawPlot}" Checked="ChooseSeries_Checked" x:Name="ChooseSeries" Height="25"/>
</DataTemplate>
</DataGridTemplateColumn.CellTemplate>
</DataGridTemplateColumn>
</DataGrid.Columns>
</DataGrid>

我有类User。它包含UserSeries。UserSeries具有属性CanDrawPlot:

public class User : INotifyPropertyChanged
{
private ObservableCollection<Series> _userSeries;
public ObservableCollection<Series> UserSeries
{
get
{
return _userSeries;
}
set
{
_userSeries = value;
OnPropertyChanged(new PropertyChangedEventArgs("UserSeries"));
}
}
public event PropertyChangedEventHandler PropertyChanged;
public void OnPropertyChanged(PropertyChangedEventArgs e)
{
PropertyChanged?.Invoke(this, e);
}
}

Answer 1

您需要在代码中添加以下行

在xaml中：您需要在bindinig中添加UpdateSourceTrigger

<CheckBox IsEnabled="{Binding CanDrawPlot,Mode=TwoWay,UpdateSourceTrigger=PropertyChanged}" Checked="ChooseSeries_Checked" x:Name="ChooseSeries" Height="25"/>

在xaml.cs中，您需要创建一个Series类的实例

例如：

private Series series = new Series ();

在xaml.cs的构造函数中，您需要编写：

DataContext = series;

成功。