Question

我有一个数据网格，我根据从另一列中选择的内容更改单元格。

让我们说，我的第一列显示工作日（枚举）。如果用户选择“星期一”，则第二列中的单元格将是TextBox。如果用户选择不同的一天（例如星期五），它将成为Text = Text =“Hooray！”，否则Textblock Text =“”。

Textbox和Textblock都绑定在同一属性中。但是这种绑定不起作用。请帮忙......

XAML

<DataGrid Margin="0,10,0,0"
                          x:Name="dataGrid"
                          AutoGenerateColumns="False"
                          IsSynchronizedWithCurrentItem="True"
                          ItemsSource="{Binding TheCollection}"
                          SelectedItem="{Binding TheSelectedItemFromTheCollection}">
                    <DataGrid.Columns>
                        <DataGridTemplateColumn Header="Days"
                                                CanUserReorder="False"
                                                CanUserResize="False"
                                                CellTemplate="{StaticResource local.DataGridDays}" />
                        <DataGridTemplateColumn Header="Value"
                                                CanUserReorder="False"
                                                CanUserResize="False"
                                                CellTemplate="{StaticResource local.DataGridValue}" />
                    </DataGrid.Columns>
</DataGrid>

<DataTemplate x:Key="local.DataGridValuesEditable">
    <StackPanel>
        <Border Background="White"
                BorderThickness="1"
                Padding="4">
            <TextBox Text="{Binding InitialValue, RelativeSource={RelativeSource Self}, UpdateSourceTrigger=PropertyChanged}"
                     VerticalAlignment="Bottom"
                     Margin="0" />
        </Border>
    </StackPanel>
</DataTemplate>
<DataTemplate x:Key="local.DataGridValuesDefault">
    <StackPanel>
        <Border Background="White"
                BorderThickness="1"
                Height="30"
                Padding="4">
            <TextBlock  Text="{Binding InitialValue, Mode=TwoWay, RelativeSource={RelativeSource Self}, UpdateSourceTrigger=PropertyChanged}"
                        VerticalAlignment="Bottom"
                        Margin="0"
                        Width="55" />
        </Border>
    </StackPanel>
</DataTemplate>
<DataTemplate x:Key="local.DataGridValue">
    <ContentControl>
        <ContentControl.Style>
            <Style TargetType="ContentControl">
                <Setter Property="ContentTemplate"
                        Value="{DynamicResource local.DataGridValuesDefault}" />
                <Style.Triggers>
                    <DataTrigger Binding="{Binding SelectedDay, UpdateSourceTrigger=PropertyChanged}"
                                 Value="Monday">
                        <Setter Property="ContentTemplate"
                                Value="{DynamicResource local.DataGridValuesEditable}" />
                    </DataTrigger>
                </Style.Triggers>
            </Style>
        </ContentControl.Style>
    </ContentControl>
</DataTemplate>

视图模型

private ObservableCollection<TheModel> _theCollection;

public ObservableCollection<TheModel> TheCollection
{
    get
    {
        if (_theCollection == null)
            _theCollection = new ObservableCollection<TheModel>();
        return _theCollection;
    }
    set
    {
        _theCollection = value;
    }
}

private TheModel _theSelectedItemFromTheCollection;

public TheModel TheSelectedItemFromTheCollection
{
    get
    {
        if (_theSelectedItemFromTheCollection == null)
            _theSelectedItemFromTheCollection = new TheModel();
        return _theSelectedItemFromTheCollection;
    }
    set
    {
        _theSelectedItemFromTheCollection = value;
        NotifyPropertyChanged("TheSelectedItemFromTheCollection");
    }
}

模型

public string SelectedDay
{
    get { return day; }
    set
    {
        day = value;
        if (day == TheWeekDays.Friday.ToString())
        {
            InitialValue = "Hooray!!";
        }
        else
            InitialValue = string.Empty;        
        NotifyPropertyChanged("SelectedDay");
    }
}

private string _initialValue;
public string InitialValue
{
    get { return _initialValue; }
    set
    {
        _initialValue = value;
        NotifyPropertyChanged("InitialValue");
    }
}

public IEnumerable<WeekDays> TheWeekDays
{
    get
    {
        return Enum.GetValues(typeof(WeekDays))
                    .Cast<WeekDays>();
    }
}

Answer 1

以下是所需的情况：

DataContext和local.DataGridValuesDefault的{{1}}应该是行项local.DataGridValuesEditable。

使用此TheModel，绑定可以写成如下：

DataContext

和

<TextBox Text="{Binding InitialValue,UpdateSourceTrigger=PropertyChanged}"

<TextBlock Text="{Binding InitialValue}"的{{1}}包含所需的项目。 DataContext会将其local.DataGridValue转换为其ContentControl的{{1}}，因此Content需要与外DataContext相关联。此外，触发器绑定可以简化：

ContentTemplate

绑定不在datagrid内更新

1 个答案: