Question

使用此代码，我只能在MainWindow上获得控制权

Public Shared Function FindChild(Of T As DependencyObject)(ByVal parent As DependencyObject, ByVal childName As String) As T
    If parent Is Nothing Then Return Nothing
    Dim foundChild As T = Nothing
    Dim childrenCount As Integer = VisualTreeHelper.GetChildrenCount(parent)

    For i As Integer = 0 To childrenCount - 1
        Dim child = VisualTreeHelper.GetChild(parent, i)
        Dim childType As T = TryCast(child, T)

        If childType Is Nothing Then
            foundChild = FindChild(Of T)(child, childName)
            If foundChild IsNot Nothing Then Exit For
        ElseIf Not String.IsNullOrEmpty(childName) Then
            Dim frameworkElement = TryCast(child, FrameworkElement)

            If frameworkElement IsNot Nothing AndAlso frameworkElement.Name = childName Then
                foundChild = CType(child, T)
                Exit For
            End If
        Else
            foundChild = CType(child, T)
            Exit For
        End If
    Next

    Return foundChild
End Function

Public sub findControl()
 Dim foundTKU As TextBox = FindChild(Of TextBox)(Application.Current.MainWindow, "TKU_" & row("gorivo"))
End sub

我将如何实现相同的内容，而要执行MainWindow来在活动窗口或WPF网格（称为“ controlGrid”）中查找

Answer 1

只需将活动窗口或控件的实例传递给方法，而不要传递Application.Current.MainWindow：

Public sub findControl()
    Dim foundTKU As TextBox = FindChild(Of TextBox)(controlGrid, "TKU_" & row("gorivo"))
End sub

在活动窗口或网格内部而不是MainWindow上找到控件

1 个答案: