相关疑难解决方法(0)

我不是在讨论这个事件处理程序,而是简单地If Statement检查是否CheckBox已经检查过.到目前为止,我有:

if (chkRevLoop.IsChecked == true){}

但这引发了错误:

无法隐式转换类型'bool？' 'bool'.存在显式转换(您是否错过了演员？)

有没有办法做到这一点,我错过了？

我遇到的问题与DataGrid(WPF)中的复选框有关.我已附上截图以更好地理解问题.

问题:即使其中一个子项未选中,也会检查DataHeader列复选框.我希望解决方案能够解决这个问题,以便在用户明确取消选中其中一个子节点时,应该隐式取消选中ALL(列标题).

请帮助大家......谢谢Plz检查链接.我希望解决方案能够像这样工作.http://www.codeproject.com/Articles/42437/Toggling-the-States-of-all-CheckBoxes-Inside-a-Dat#

<dg:DataGrid.Columns>
    <dg:DataGridCheckBoxColumn Binding="{Binding Check}" IsThreeState="True" Width="50">
        <dg:DataGridCheckBoxColumn.HeaderTemplate>
            <DataTemplate x:Name="dtAllChkBx">
                <CheckBox Name="cbxAll" Content="{x:Static properties:Resources.lblAll}"
                          Checked="CheckBox_Checked" Unchecked="CheckBox_Unchecked" />
            </DataTemplate>
        </dg:DataGridCheckBoxColumn.HeaderTemplate>
    </dg:DataGridCheckBoxColumn>

.

private void CheckBox_Unchecked(object sender, RoutedEventArgs e)
{
    unchck_all_prd();
    dgEnggAcc.Items.Refresh();
}

private void unchck_all_prd()
{
    for (int i = 0; i < engg_list.Count; i++)
    {
        engg_list[i].Check = false;
    }
}

private void chck_all_prd()
{
    for (int i = 0; i < engg_list.Count; i++)
    {
        engg_list[i].Check = true;
    }
}

public class EnggLst : ObservableCollection<EnggLst>
{
    public bool …

我有一个绑定到列表的DataGrid，如下所示。

风景：

<DataGrid Name="m_dgWorkItems" ItemsSource="{Binding WorkItems}" AutoGenerateColumns="False" CanUserAddRows="False" Margin="12,70,12,12">
    <DataGrid.Columns>
        <DataGridCheckBoxColumn Header="Selected" Binding="{Binding Selected}" />
        <DataGridTextColumn Header="Id" Binding="{Binding Id}" IsReadOnly="True" />
        <DataGridTextColumn Header="Summary" Binding="{Binding Summary}" IsReadOnly="True" />
        <DataGridTextColumn Header="State" Binding="{Binding State}" IsReadOnly="True" />
        <DataGridTextColumn Header="Owner" Binding="{Binding Owner}" IsReadOnly="True" />
    </DataGrid.Columns>
</DataGrid>

ViewModel：

public List<WorkItem> WorkItems
{
    get { return m_workItems; }
    private set { m_workItems = value; RaisePropertyChanged("WorkItems"); }
}

public class WorkItem
{
    public bool Selected { get; set; }

    public string Id { get; set; }
    public string …