WPF-使用特定的datagrid事件訪問存在於datagrid（xaml）中的文本框

Question

我在使用xaml設計的datagrid中有一個文本框。我可以使用datagrid的事件訪問之前在代碼文件中使用xaml設計的文本框。請幫我.....................

<Window x:Class="GridTextBox.Test" 
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" WindowState="Maximized" 
    Title="Test" Height="300" Width="300" Loaded="Window_Loaded"> 
<Grid> 
    <Grid.RowDefinitions> 
     <RowDefinition Height="30"/> 
     <RowDefinition Height="*"/> 
     <RowDefinition Height="30"/> 
    </Grid.RowDefinitions> 
    <Grid.ColumnDefinitions> 
     <ColumnDefinition Width=".25*"/> 

     <ColumnDefinition Width=".25*"/> 
     <ColumnDefinition Width=".25*"/> 
     <ColumnDefinition Width=".25*"/> 
    </Grid.ColumnDefinitions> 
    <DataGrid Grid.Row="1" Grid.Column="1" Name="datagrid1" SelectionChanged="datagrid1_SelectionChanged" LoadingRowDetails="DataGrid_LoadingRowDetails" Height="auto" Width="auto"> 
     <DataGrid.Columns> 
      <DataGridTemplateColumn> 
       <DataGridTemplateColumn.CellTemplate> 
        <DataTemplate> 
         <TextBox Name="txtEmpid" Text="hiiiiii"></TextBox> 
        </DataTemplate> 
       </DataGridTemplateColumn.CellTemplate> 
      </DataGridTemplateColumn> 
     </DataGrid.Columns> 
    </DataGrid> 
</Grid> 

Answer 1

你可以使用DataGrid的下列擴展。
只需創建一個新模塊並插入以下代碼即可。

Module Extensions 
<Extension()> 
    Public Function GetDataTemplateObjectFromSelectedRow(Of DataTemplateType As Visual)(ByVal lDataGrid As DataGrid, ByVal lColumnIndex As Integer) As DataTemplateType 
    Dim lRow As DataGridRow 
    Dim lCell As DataGridCell 
    Dim lPresenter As DataGridCellsPresenter 
    Dim lFoundObject As DataTemplateType = Nothing 

    If lDataGrid.SelectedIndex >= 0 Then 
     lRow = lDataGrid.ItemContainerGenerator.ContainerFromIndex(lDataGrid.SelectedIndex) 
     lPresenter = GetVisualChild(Of DataGridCellsPresenter)(lRow) 
     lCell = lPresenter.ItemContainerGenerator.ContainerFromIndex(lColumnIndex) 
     lFoundObject = GetVisualChild(Of DataTemplateType)(lCell) 
    End If 
    Return lFoundObject 
    End Function 

    Public Function GetVisualChild(Of T As Visual)(parent As Visual) As T 
    Dim child As T = Nothing 
    Dim numVisuals As Integer = VisualTreeHelper.GetChildrenCount(parent) 
    For i As Integer = 0 To numVisuals - 1 
     Dim v As Visual = DirectCast(VisualTreeHelper.GetChild(parent, i), Visual) 
     child = TryCast(v, T) 
     If child Is Nothing Then 
     child = GetVisualChild(Of T)(v) 
     End If 
     If child IsNot Nothing Then 
     Exit For 
     End If 
    Next 
    Return child 
    End Function 

End Module 

之後，你可以調用下面的函數在數據網格的事件：

Private Sub DataGridButtons_CurrentCellChanged(sender As Object, e As EventArgs) Handles DataGridButtons.CurrentCellChanged 
    Dim lTextBox As TextBox = DataGridButtons.GetDataTemplateObjectFromSelectedRow(Of TextBox)(0) 
    End Sub 

的部分(Of TextBox)描述您的預計數據類型與參數(0)您所描述的相關GridColumn

Answer 2

解決方案C＃

namespace ExtensionMethods 
{ 
    public static class Extensions 
    { 

    public static DataTemplateType GetDataTemplateObjectFromSelectedRow<DataTemplateType>(DataGrid lDataGrid, int lColumnIndex) where DataTemplateType : Visual 
    { 
     DataGridRow lRow = default(DataGridRow); 
     DataGridCell lCell = default(DataGridCell); 
     DataGridCellsPresenter lPresenter = default(DataGridCellsPresenter); 
     DataTemplateType lFoundObject = null; 

     if (lDataGrid.SelectedIndex >= 0) 
     { 

     lRow = (DataGridRow)lDataGrid.ItemContainerGenerator.ContainerFromIndex(lDataGrid.SelectedIndex); 
     lPresenter = GetVisualChild<DataGridCellsPresenter>(lRow); 
     lCell = (DataGridCell)lPresenter.ItemContainerGenerator.ContainerFromIndex(lColumnIndex); 
     lFoundObject = GetVisualChild<DataTemplateType>(lCell); 
     } 
     return lFoundObject; 
    } 

    public static T GetVisualChild<T>(Visual parent) where T : Visual 
    { 
     T child = null; 
     int numVisuals = VisualTreeHelper.GetChildrenCount(parent); 
     for (int i = 0; i <= numVisuals - 1; i++) 
     { 
     Visual v = (Visual)VisualTreeHelper.GetChild(parent, i); 
     child = v as T; 
     if (child == null) 
     { 
      child = GetVisualChild<T>(v); 
     } 
     if (child != null) 
     { 
      break; // TODO: might not be correct. Was : Exit For 
     } 
     } 
     return child; 
    } 

    } 
} 

使用以下調用來獲得文本框：

private void DataGridButtons_SelectionChanged(object sender, SelectionChangedEventArgs e) 
{ 
    TextBox lTextBox = Extensions.GetDataTemplateObjectFromSelectedRow<TextBox>(DataGridButtons, 0); 
}