无法创建类型的实例

问题描述：

我已经创建了一个UserControl Popup窗口，并将该xaml文件称为另一个文件.导入了名称空间.

当我尝试构建此项目时，在以下给定代码处出现错误:

I have created a UserControl Popup window and called that xaml file into another file. Imported the namespace.

When I am trying to build this project an error at this below given code:

<Popup x:Name="POP" IsOpen="False" PlacementTarget="{Binding}" Placement="Center" AllowsTransparency="True">
      <a:PopUpWindow x:Name="pp" />
</Popup>

" <a:PopUpWindow x:Name="pp" /> " : Could not create an instance of type ''PopUpWindow''.

Error at " <a:PopUpWindow x:Name="pp" /> " : Could not create an instance of type ''PopUpWindow''.

答

时出错，您确定这是编译器错误吗?这可能是智能错误，还是设计人员抛出了设计时间错误?

另外，该类型是否具有公共默认构造函数?

Are you sure this is a compiler error? It may be an intellisense error, or the designer throwing up a design time error?

Alternatively, does that type have a public default constructor?

无法创建类型的实例

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