c# - 使用 observablecollection 绑定(bind)复选框

Question

我有一个数据网格，其中有一列我想用数据填充。因此我做了一个模板选择器

<DataGridTemplateColumn Header="Value" IsReadOnly="False">
            <DataGridTemplateColumn.CellTemplateSelector>
                <c:checkBoxCheckConverter 
                        ValueIsBoolean="{StaticResource ValueIsBoolean}"
                        ValueIsColumn3="{StaticResource ValueIsColumn3}"/>
            </DataGridTemplateColumn.CellTemplateSelector>
        </DataGridTemplateColumn>
    </DataGrid.Columns>

模板:

 public class checkBoxCheckConverter : DataTemplateSelector
{
    public DataTemplate ValueIsBoolean
    { get; set; }
    public DataTemplate ValueIsColumn3
    { get; set; }

    public override DataTemplate SelectTemplate(object item, DependencyObject container)
    {

        cDGStructure cdgStructure = item as cDGStructure;
        if (cdgStructure != null)
        {
            if (((cdgStructure.Column3) == "True") | ((cdgStructure.Column3) == "False"))
                return ValueIsBoolean;
            else
                // return ValueIsNotBoolean;
                cdgStructure = cdgStructure;
            return ValueIsColumn3;

        }
        else
            return base.SelectTemplate(item, container);
    }
}


 <DataTemplate x:Key="ValueIsBoolean">
        <CheckBox Content="">
            <CheckBox.Style>
                <Style TargetType="{x:Type CheckBox}">
                    <Setter Property="IsChecked" Value="False"/>
                    <Style.Triggers>
                        <DataTrigger Binding="{Binding Column3, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"  Value="True">
                            <Setter Property="IsChecked" Value="True"/>
                        </DataTrigger>
                    </Style.Triggers>
                </Style>
            </CheckBox.Style>
        </CheckBox>
     </DataTemplate>
    <DataTemplate x:Key="ValueIsColumn3">
        <TextBox Text="{Binding Column3, Mode=TwoWay, UpdateSourceTrigger=LostFocus}"/>
    </DataTemplate>

使用的数据结构:

public class cDGStructure : INotifyPropertyChanged
{
    private string _column1; //name
    private string _column2; //type
    private string _column3; //value
    private string _column4; //comment          
    //comment

    public cDGStructure(string column1, string column2, string column3, string column4)
    {
        _column1 = column1;
        _column2 = column2;
        _column3 = column3;
        _column4 = column4;
    }

    public string Column1
    {
        get { return _column1; }
        set
        {
            _column1 = value;
            NotifyPropertyChanged("Column1");

        }
    }

    public string Column2
    {
        get { return _column2; }
        set
        {
            _column2 = value;
            NotifyPropertyChanged("Column2");
        }
    }

    public string Column3
    {
        get { return _column3; }
        set
        {
            _column3 = value;
            NotifyPropertyChanged("Column3");
        }
    }

    public string Column4
    {
        get { return _column4; }
        set
        {
            _column4 = value;
            NotifyPropertyChanged("Column4");
        }
    }

#region INotifyPropertyChanged Members
    public event PropertyChangedEventHandler PropertyChanged;
    #endregion

    #region Private Helpers
    private void NotifyPropertyChanged(string propertyName)
    {
        if (PropertyChanged != null)
        {
            PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
        }
    }
    #endregion

网格填充如下:

public ObservableCollection<cDGStructure> collSymbolsDataGrid = new ObservableCollection<cDGStructure>();

        moi =  "moi"; 
        waar = "True"; 
        nwaar = "False";

        collSymbolsDataGrid.Add(new cDGStructure(moi, moi, nwaar, moi));
        collSymbolsDataGrid.Add(new cDGStructure(moi, moi, waar, moi));
        collSymbolsDataGrid.Add(new cDGStructure(moi, moi, moi, moi));
        InitializeComponent();
        dgSymbolGrid.ItemsSource = collSymbolsDataGrid;

Datagrid 中填充了正确的对象和正确的数据。文本框已正确绑定(bind)，程序会在失去焦点后通知运行时所做的更改。

现在的问题是复选框。通过初始化，数据网格仅显示正确的数据，我的 observablecollection 没有看到在运行时所做的任何更改(IsChecked 属性)。我需要更新我的收藏。

实现它的最佳方法是什么？我试图实现一个 bool 转换器但没有成功:(谁能帮我 ？

Answer 1

TemplateSelector 不是更改对象动态更改属性值的合适工具。它旨在选择诸如对象类型或不变的属性值之类的东西。

对于属性的动态更改，请改用样式触发器。类似于以下内容:

<DataGridTemplateColumn>
    <DataGridTemplateColumn.CellStyle>
        <Style TargetType="DataGridCell">
            <!-- Template or ContentTemplate? -->
            <Setter Property="Template" Value="{StaticResource ValueIsColumn3}"/>
            <Style.Triggers>
                <!-- Alternative: use an IsBoolean converter instead of testing True and False separately -->
                <DataTrigger Binding="{Binding Column3}" Value="True">
                    <!-- Template or ContentTemplate? -->
                    <Setter Property="Template" Value="{StaticResource ValueIsBoolean}"/>
                </DataTrigger>
                <DataTrigger Binding="{Binding Column3}" Value="False">
                    <!-- Template or ContentTemplate? -->
                    <Setter Property="Template" Value="{StaticResource ValueIsBoolean}"/>
                </DataTrigger>
            </Style.Triggers>
        </Style>
    </DataGridTemplateColumn.CellStyle>
</DataGridTemplateColumn>