Wpf 数据网格文本搜索

我想在datagrid中搜索一个文本，下面编写的代码给出了一个错误

For i As Integer = 0 To _dt.Items.Count - 1
            Dim row As DataGridRow = DirectCast(_dt.ItemContainerGenerator.ContainerFromIndex(i), DataGridRow)
            For j As Integer = 0 To _dt.Columns.Count - 1
                If row IsNot Nothing Then
                    Dim cellContent As TextBlock = TryCast(_dt.Columns(j).GetCellContent(row), TextBlock)
                    If cellContent IsNot Nothing AndAlso cellContent.Text.Equals(txtfind.Text) Then
                        _dt.ScrollIntoView(row, _dt.Columns(j))
                        Dim presenter As DataGridCellsPresenter = GetVisualChild(Of DataGridCellsPresenter(row))
                        Dim cell As DataGridCell = DirectCast(presenter.ItemContainerGenerator.ContainerFromIndex(j), DataGridCell)
                        _dt.SelectedItem = cell
                        cell.IsSelected = True
                        row.MoveFocus(New TraversalRequest(FocusNavigationDirection.[Next]))
                        Exit For
                    End If
                End If
            Next
        Next

行错误：数组边界不能出现在类型说明符中。 语句：

Dim演示者作为DataGridCellsPresenter=GetVisualChild（DataGridCellsPresenter（行））显示

感谢您的帮助 阿布希摩变化：

   Dim presenter As DataGridCellsPresenter = GetVisualChild(Of DataGridCellsPresenter(row))

'you have created an array with row number of values.

致：

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这里有一个C#示例，应该很容易转换为VB是的，我想关闭这个线程

   Dim presenter As DataGridCellsPresenter = GetVisualChild(Of DataGridCellsPresenter)(row)