c# - 在 DataGrid WPF 中查找文本框

Question

我编辑了最后一个问题。我有 2 个类(class)

    public class Signal: INotifyPropertyChanged 
{
    public string Name { get; set;}
    public Int32 Value { get; set;}

    private ObservableCollection < RawVal > rawValue1;
    public ObservableCollection < RawVal > rawValue 
    {
        get  { return rawValue1; }
        set 
        {   rawValue1 = value;
            OnPropertyChanged("rawValue");
            if (value != null && value.Count > 0) 
            {
             SelectedRaValue = value.First();
            }
        }
    }

    private RawVal selectedRaValue;
    public RawVal SelectedRaValue 
    {
        get 
        {
            return selectedRaValue;
        }
        set 
        {
            selectedRaValue = value;
            OnPropertyChanged("SelectedRaValue");
            ComboValue = value.name;
            OnPropertyChanged("ComboValue");
        }
    }    
    public string ComboValue 
    {
        get;
        set;
    }    
    #region Implementation of INotifyPropertyChanged    
    public event PropertyChangedEventHandler PropertyChanged;    
    protected virtual void OnPropertyChanged(string propertyName) 
    {
        PropertyChangedEventHandler handler = PropertyChanged;
        if (handler != null) handler(this, new PropertyChangedEventArgs(propertyName));
    }    
    #endregion

这里是 XAML:

 <DataGrid ItemsSource="{Binding}" Name="grdSignal" Grid.Row="1" CanUserAddRows="False" AutoGenerateColumns="False" SelectionChanged="grdSignal_SelectionChanged_1">
 <DataGrid.Columns>
    <DataGridTextColumn Header="Signal Name" Binding="{Binding Name}" Width="150"/>
                                <DataGridTemplateColumn Header="Physical Value" Width="120">
          <DataGridTemplateColumn.CellTemplate>
             <DataTemplate>
                  <ComboBox ItemsSource="{Binding rawValue, Mode=TwoWay}" SelectedItem="{Binding SelectedRaValue,Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"  DisplayMemberPath="name" Name="cmbVal"  
                       IsEditable="True" KeyDown="cmbVal_KeyDown"  />
             </DataTemplate>
      </DataGridTemplateColumn.CellTemplate>
    </DataGridTemplateColumn>
        <DataGridTemplateColumn Header="Value" Width="100">
            <DataGridTemplateColumn.CellTemplate>
               <DataTemplate>
                <TextBox Text="{Binding ComboValue}" Name="tBoxValue" TextChanged="tBoxVale_textChanged"/>
               </DataTemplate>
           </DataGridTemplateColumn.CellTemplate>
      </DataGridTemplateColumn>
      <DataGridTemplateColumn Header="Comment" Width="200">
    <DataGridTemplateColumn.CellTemplate>
         <DataTemplate>
            <TextBox Text="{Binding Comment}"/>
             </DataTemplate>
     </DataGridTemplateColumn.CellTemplate>
   </DataGridTemplateColumn>
  </DataGrid.Columns>
 </DataGrid>      

现在，我的问题来了。组合框是可编辑的，如果用户输入任何内容(字符串)，然后按 ENTER 键，组合框文本将转到文本框文本。

private void cmbVal_KeyDown(object sender, KeyEventArgs e)
    {
        if (e.Key == Key.Return)
        {               
            string s = ((ComboBox)sender).Text;
            DataGridRow row = sigGrid.ItemContainerGenerator.ContainerFromIndex(sigGrid.SelectedIndex) as DataGridRow;
            var i = 3;
            TextBox ele = sigGrid.FindName("tbValue") as TextBox;
        }

    }

结果是:

Answer 1

@Mamurbek,

您可以使用该帖子的 FindVisualDescendants 函数:
Datagrid templatecolumn update source trigger explicit only updates first row

使用该函数，您可以拥有所有文本框，例如:

var textboxes = AccessGrid.FindAllVisualDescendants()
    .Where(elt => elt.Name == "tBoxValue" )
    .OfType<TextBox>();

例如第一个:

var textboxes = AccessGrid.FindAllVisualDescendants()
    .Where(elt => elt.Name == "tBoxValue" )
    .OfType<TextBox>()
    .FirstOrDefault();

或者只有第 3 个使用 Skip and Take:

int n = 3;
var textboxes = AccessGrid.FindAllVisualDescendants()
    .Where(elt => elt.Name == "tBoxValue" )
    .OfType<TextBox>()
    .Skip(n-1)
    .Take(1);

希望对你有帮助