获取 DataGrid 模板列中所有选定复选框的 WPF 数据网格行

Question

我有一个DataGrid，它显示了Employees 的一些花名册信息。我添加了一个带有CheckBox 的模板列。我想从选定（CheckBox selected）行的所有行中获取KeyIDs（从 DB 绑定）。这些KeyIDs 我必须传递给 SQL 以删除选定的行 (BtnDeleteSelected_Click)。请帮忙。

这是我的DataGrid：

<DataGrid AutoGenerateColumns="False" Grid.Row="1" Height="555" HorizontalAlignment="Left" Margin="0,5,0,0" Name="dgRosterList" VerticalAlignment="Top" Width="980"   ItemsSource="{Binding}" SelectionMode="Single" SelectionUnit="FullRow" CanUserResizeColumns="True" CanUserSortColumns="True"  AlternatingRowBackground="Gainsboro"  AlternationCount="2" IsEnabled="True" Grid.ColumnSpan="2">                
    <DataGrid.Columns>
        <DataGridTemplateColumn Width="30">
            <DataGridTemplateColumn.HeaderTemplate>
                <DataTemplate>
                    <CheckBox x:Name="all" Content="" Click="CheckBox_Click"/>
                </DataTemplate>
            </DataGridTemplateColumn.HeaderTemplate>

            <DataGridTemplateColumn.CellTemplate>
                <DataTemplate>
                    <CheckBox Checked="chkSelect_Checked" Name="chkSelect"></CheckBox>
                </DataTemplate>
            </DataGridTemplateColumn.CellTemplate>
        </DataGridTemplateColumn>
        <DataGridTextColumn Header="Sl No" Binding="{Binding SlNo}"/>
        <DataGridTextColumn Header="Key ID" Binding="{Binding KeyID}" Width="80" Visibility="Hidden"/>
        <DataGridTextColumn Header="Emp ID" Binding="{Binding Emp_ID}" Width="80"/>
        <DataGridTextColumn Header="Emp Name" Binding="{Binding Emp_Name}" Width="200"/>
        <DataGridTextColumn Header="Date" Binding="{Binding PDate, StringFormat={}{0:dd/MM/yyyy}}" Width="100"/>
        <DataGridTextColumn Header="Shift" Binding="{Binding Shift_Code}" Width="80"/>
        <DataGridTextColumn Header="In Time" Binding="{Binding InTime, StringFormat={}{0:hh:mm}}" Width="80"/>
        <DataGridTextColumn Header="Out Time" Binding="{Binding OutTime, StringFormat={}{0:hh:mm}}" Width="80"/>
        <DataGridTemplateColumn Header="Half Day" Width="80">
            <DataGridTemplateColumn.CellTemplate>
                <DataTemplate>
                    <Image Name="IsHalfDay" Width="15" Height="15" Source="" />
                        <DataTemplate.Triggers>
                            <DataTrigger Binding="{Binding HalfDay}" Value="Yes">
                                <Setter TargetName="IsHalfDay" Property="Source" Value="../Images/ico_tick.gif"/>
                            </DataTrigger>
                        </DataTemplate.Triggers>
                </DataTemplate>
            </DataGridTemplateColumn.CellTemplate>
        </DataGridTemplateColumn>
        <DataGridTemplateColumn Header="Off Day" Width="80">
            <DataGridTemplateColumn.CellTemplate>
                <DataTemplate>
                    <Image Name="IsOffDay" Width="15" Height="15" Source="" />
                    <DataTemplate.Triggers>
                        <DataTrigger Binding="{Binding OffDay}" Value="Yes">
                            <Setter TargetName="IsOffDay" Property="Source" Value="../Images/ico_tick.gif"/>
                        </DataTrigger>
                    </DataTemplate.Triggers>
                </DataTemplate>
            </DataGridTemplateColumn.CellTemplate>
        </DataGridTemplateColumn>
        <DataGridTemplateColumn Header="Delete" Width="75">
            <DataGridTemplateColumn.CellTemplate>
                <DataTemplate>
                    <Button Name="btnDelete" Click="btnDelete_Click" Width="50" Height="20" ToolTip="Delete Roster" CommandParameter="{Binding Path=KeyID}" >
                        <Image Source="../Images/delete.png" Width="15" Height="19"/>
                    </Button>
                </DataTemplate>
            </DataGridTemplateColumn.CellTemplate>
        </DataGridTemplateColumn>
        <DataGridTextColumn Header="Processed" Binding="{Binding Processed}"  Visibility="Hidden"/>
    </DataGrid.Columns>
    <DataGrid.RowDetailsTemplate>
        <DataTemplate>
            <StackPanel Orientation="Horizontal">
                <!--<Image Source="{Binding XPath=media:thumbnail/@url}"
                    Width="60" Height="60"/>-->
                <TextBlock Text="{Binding Path=WeeklyOffs}"/>
            </StackPanel>
        </DataTemplate>
    </DataGrid.RowDetailsTemplate>
</DataGrid>

Answer 1

在Event：

private void chkSelect_Checked(object sender, RoutedEventArgs e)
{
    dgRosterList.IsSynchronizedWithCurrentItem = true;
}

这将导致highlighting当前的row 就像它被选中一样。

在XAML 中使用DataGrid 的SelectedItem 属性：

SelectedItem="{Binding SelectedEmployeeData}"

在ViewModel中，定义SelectedEmployeeData的属性：

private DeleteViewModel m_SelectedEmployeeData;

public DeleteViewModel SelectedEmployeeData
{
    get 
    { 
        return m_SelectedEmployeeData; 
    }

    set 
    { 
        m_SelectedEmployeeData = value;

        if (null != m_SelectedEmployeeData)
        {
            listToSend.Add(m_SelectedEmployeeData.KeyID);
        }
        else
        {
            listToSend.Remove(m_SelectedEmployeeData.KeyID);
        }

        OnPropertyChanged("SelectedEmployeeData");
    }
}

和：

List<int> listToSend = new List<int>();

lstSend 将包含要发送到DB 的KeyIDs。

这里DeleteViewModel 是VM，我假设与列相关的所有属性，即KeyID、Emp_ID 等都将被定义。

Answer 2

您可以使用FindChild() 访问CheckBox：

    public static T FindChild<T>(DependencyObject parent, string childName) where T : DependencyObject
    {
        if (parent == null)
        {
            return null;
        }

        T foundChild = null;

        int childrenCount = VisualTreeHelper.GetChildrenCount(parent);

        for (int i = 0; i < childrenCount; i++)
        {
            var child = VisualTreeHelper.GetChild(parent, i);
            T childType = child as T;

            if (childType == null)
            {
                foundChild = FindChild<T>(child, childName);

                if (foundChild != null) break;
            }
            else
                if (!string.IsNullOrEmpty(childName))
                {
                    var frameworkElement = child as FrameworkElement;

                    if (frameworkElement != null && frameworkElement.Name == childName)
                    {
                        foundChild = (T)child;

                        break;
                    }
                    else
                    {
                        foundChild = FindChild<T>(child, childName);

                        if (foundChild != null)
                        {
                            break;
                        }
                    }
                }
                else
                {
                    foundChild = (T)child;
                    break;
                }
        }

        return foundChild;
    }

如果你只是调用这个函数，它将只返回 first 控件，但我们需要一个 CheckBox 来代替 Selected Row。要访问选定行的控件以将事件SelectionChanged 添加到要在其中起作用的DataGrid，这将给出Selected Row：

<DataGrid Name="MyDataGrid" SelectionChanged="MyDataGrid_SelectionChanged">

private void MyDataGrid_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
    try
    {
        // Get the list of rows
        var row_list = GetDataGridRows(MyDataGrid);

        // Check the all rows
        foreach (DataGridRow single_row in row_list)
        {               
            if (single_row.IsSelected == true)
            {
               CheckBox MyCheckBox = FindChild<CheckBox>(single_row, "MyCheckBox"); // here your CheckBox name

                MessageBox.Show(MyCheckBox.IsChecked.ToString());
            }
        }
    }

    catch 
    {
        throw new Exception("Can't get access to DataGridRow");
    }
}

GetDataGridRows() 的列表：

public IEnumerable<DataGridRow> GetDataGridRows(DataGrid grid)
{
    var itemsSource = grid.ItemsSource as IEnumerable;

    if (null == itemsSource)
    {
        yield return null; 
    }

    foreach (var item in itemsSource)
    {
        var row = grid.ItemContainerGenerator.ContainerFromItem(item) as DataGridRow;

        if (null != row)
        {
            yield return row; 
        }
    }
}

如您所见，这种做法并不是很有用，因此也不是很正确。您可以将属性MyChecked 和OnPropertyChanged() 添加到他的DataContext。示例：

    public class YourClass : INotifyPropertyChanged
    {
        private bool? myChecked = null;

        #region INotifyPropertyChanged values

        public event PropertyChangedEventHandler PropertyChanged;

        protected void OnPropertyChanged(string propertyName)
        {
            if (this.PropertyChanged != null)
            {
                this.PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
            }
        }

        #endregion

        public bool? MyChecked
        {
            get
            {
                return myChecked;
            }

            set
            {
                myChecked = value;
                OnPropertyChanged("myChecked");
            }
        }
    }

并像这样使用：

<CheckBox x:Name="MyCheckBox" IsChecked="{Binding MyChecked}" />        

每次更改属性时，都会触发OnPropertyChanged()，您可以进行一些操作。也就是说，尽量不要让他们的行为站在XAML的一边，而是站在你的数据一边，因为在第一种情况下，很难与DataGrid合作。

Answer 3

在绑定到每一行的类中定义一个bool属性（如IsRowSelected），将其绑定到CheckBox的Ischecked属性，然后您可以删除@987654325中IsRowSelected=True的所有行@。