从wpf复选框列表中获取所有选定的项目给我错误 [英] get all selected items from wpf checkbox list give me error

问题描述

我的列表框带有复选框，如下所示，&它从sql server数据库绑定它的数据，

，我想得到选定的项值当我运行这个但是我收到了这个错误



无法将'System.Data.DataRowView'类型的对象强制转换为'System.Windows.Controls.CheckBox'。

< Window.Resources> 
< DataTemplate x：Key =   NameColumnTemplate >  
< CheckBox Height =   20 FontFamily =   Arial FontSize =   14 Content =   {Binding Path = PermissionDescription} 
 Tag =   {Binding PermissionID} Horizo​​ntalAlignment =  拉伸 VerticalAlignment =  中心 
 /> 
 < /   DataTemplate  >  
 < /   Window.Resources   >  
< Grid> 
< ListBox Horizo​​ntalAlignment =  拉伸 Margin =   12,12,136,21名称=   lstEmployees 
 VerticalAlignment =   Stretch ItemsSource = < span class =code-string>  {Binding Tables [0]} 
 ItemTemplate =   {StaticResource NameColumnTemplate} 
 ScrollViewer.VerticalScrollBarVisibility =  < span class =code-string> Auto removed =   {x：Null} 
 BorderBrush =   #FF AD7F30 
 SelectionChanged =   lst_SelectionChanged CheckBox.Click =   lst_SelectionChanged /> 
< Button Content =   listbox高度=   23 Horizo​​ntalAlignment =  左 Margin =   214,207,0,0 Name =   btnShowSelectedItems 
 VerticalAlignment =   Top Width =   75 Click =   btnShowSelectedItems_Click /> 
 < /  网格 >  

  public  Window2（ ）
 {
 InitializeComponent（）; 
  //  绑定数据 
 lstEmployees.DataContext = SelJobsCat（）; 
} 
 
  private   void  btnShowSelectedItems_Click（ object  sender，RoutedEventArgs e）
 {
  foreach （CheckBox item  in  lstEmployees.Items）
 {
  if （item.IsChecked ==  true ）
 {
 System.Windows.MessageBox.Show（（item.Content +  被选中。））; 
 
} 
} 
} 
 
  private   void  lst_SelectionChanged（ object  sender，RoutedEventArgs e）
 {
  if （e.OriginalSource   CheckBox）
 {
 lstEmployees.SelectedItem = e.OriginalSource; 
} 
 
  if （lstEmployees.SelectedItem ==  null ） 返回; 
 Console.WriteLine（lstEmployees.SelectedIndex）; 
 Console.WriteLine（（（CheckBox）lstEmployees.SelectedItem）.IsChecked）; 
} 
 

我的错误在哪里，谢谢

解决方案

使用CheckBoxList的GetItemChecked或GetItemCheckState方法

 for（int i = 0; i< lstEmployees.Items.Count ; i ++）
 if（clbIncludes.GetItemChecked（i））
 System.Windows.MessageBox.Show（（item.Content +is checked。））;; 
 else 
 //未选择的东西
 
或者如果你只想包括实际检查的项目：
 
 if（stEmployees.GetItemCheckState（i）= = CheckState.Checked）
 
或listitem.selected：
 
 foreach（lstEmployees.Items中的ListItem listItem）
 {
 if（listItem.Selected） {
 //做一些工作
} 
 else {
 //做一些工作
} 
} 

I have listbox with checked box as following, & it binding its data from sql server database,
, I want to get selected items value When I run this but I got this error

Unable to cast object of type 'System.Data.DataRowView' to type 'System.Windows.Controls.CheckBox'.

<Window.Resources>
        <DataTemplate x:Key="NameColumnTemplate">
            <CheckBox Height="20"  FontFamily="Arial" FontSize="14"  Content="{Binding Path=PermissionDescription}" 
                      Tag="{Binding PermissionID}" HorizontalAlignment="Stretch" VerticalAlignment="Center"
                      />
        </DataTemplate>
    </Window.Resources>
<Grid>
<ListBox HorizontalAlignment="Stretch" Margin="12,12,136,21" Name="lstEmployees" 
                          VerticalAlignment="Stretch" ItemsSource="{Binding Tables[0]}"  
                          ItemTemplate="{StaticResource NameColumnTemplate}" 
                          ScrollViewer.VerticalScrollBarVisibility="Auto" removed="{x:Null}" 
                         BorderBrush="#FFAD7F30"  
                 SelectionChanged="lst_SelectionChanged" CheckBox.Click="lst_SelectionChanged"/>
<Button Content="listbox" Height="23" HorizontalAlignment="Left" Margin="214,207,0,0" Name="btnShowSelectedItems" 
                VerticalAlignment="Top" Width="75" Click="btnShowSelectedItems_Click" />
</Grid>

public Window2()
       {
           InitializeComponent();
           // bind data
           lstEmployees.DataContext = SelJobsCat();
       }

private void btnShowSelectedItems_Click(object sender, RoutedEventArgs e)
       {
           foreach (CheckBox item in lstEmployees.Items)
           {
               if (item.IsChecked == true)
               {
                   System.Windows.MessageBox.Show((item.Content + " is checked."));

               }
           }
       }

       private void lst_SelectionChanged(object sender, RoutedEventArgs e)
       {
           if (e.OriginalSource is CheckBox)
           {
               lstEmployees.SelectedItem = e.OriginalSource;
           }

           if (lstEmployees.SelectedItem == null) return;
           Console.WriteLine(lstEmployees.SelectedIndex);
           Console.WriteLine(((CheckBox)lstEmployees.SelectedItem).IsChecked);
       }

where is my error please, Thanks

解决方案

Use the CheckBoxList's GetItemChecked or GetItemCheckState method

for (int i = 0; i < lstEmployees.Items.Count; i++)
  if (clbIncludes.GetItemChecked(i))
    System.Windows.MessageBox.Show((item.Content + " is checked."));
  else
    // Do unselected stuff

or if you want to only include actually checked items:

if (stEmployees.GetItemCheckState(i) == CheckState.Checked)

or listitem.selected:

foreach (ListItem listItem in lstEmployees.Items)
{
    if (listItem.Selected) {
        //do some work
    }
    else {
        //do some work
    }
}

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