負載WPF用戶控件動態

Question

我有一個抽象基類aComponent和亞類CriteriaList，Question等

對於每個子類兩個對應UserControl S的具有名稱等，ubCriteriaList，ueQuestion，ubQuestion我有等。（ue代表短爲「UserControl與輸入元件」，併爲ub「UserControl帶有按鈕」。）

DataContext的是「ControllerClass」與一個屬性作爲實際aComponent實例的獲取者。當aComponent實例更改（例如CriteriaList的實例）時，我想加載相應的UserControl（在本例中爲ueCriteriaList和ubCriteriaList）。

我有兩個轉換器和ueControlConverterubControlConverter內搭類名稱（例如CriteriaList），並返回一個UserControl實例（在此情況下，）。

Public Class ueControlConverter 
    Implements IValueConverter 

    Public Function Convert(value As Object, targetType As Type, parameter As Object, 
          culture As System.Globalization.CultureInfo) As Object 
          Implements IValueConverter.Convert 
     Dim aComp As aComponent = value 
     Dim assemblyKlassenname As String = aComp.GetType.ToString 
     Dim assemblyName As String = Left(assemblyKlassenname, 
              assemblyKlassenname.IndexOf(".") + 1) 
     Dim klassenName As String = Right(assemblyKlassenname, 
              assemblyKlassenname.IndexOf(".") - 1) 
     Dim t As Type = Type.GetType(assemblyName & "ue" & klassenName) 
     Dim o As UserControl = Activator.CreateInstance(t) 
     o.DataContext = value 
     Return o 
    End Function 

    Public Function ConvertBack(value As Object, targetType As Type, parameter As Object, 
           culture As System.Globalization.CultureInfo) As Object 
        Implements IValueConverter.ConvertBack 
     Return value 
    End Function 
End Class 

在XAML我有結合Content="{Binding Path=my_aComponent, Converter={StaticResource _ueControlConverter}和秒。顯示了右邊的UserControl，但沒有與my_aComponent綁定。

我該怎麼辦？

Answer 1

您還需要通過綁定爲您的ContentControl對象提供DataContext屬性。