Partial declarations, must not specify different base classes
c#, wpf, xaml
Solution
By using `<UserControl ...` you claim the base-class to be `UserControl`, you would need to change it to
<we:AScreenUserControl x:Class="ProgramManagementV2.screens.MainUserControl" ...
However `UserControls` only allow one level of inheritance i think, at least if the `AScreenUserControl` has a XAML this surely will not work.
Problem
I know there is information about this on the internet and I've searched for it. But I'm still getting the error, can anyone point out to me what I'm doing wrong? Base class: ``` using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Windows.Controls; namespace ProgramManagementV2.screens { public abstract class AScreenUserControl : UserControl { public string GetScreenDescriptionName() { return "No name yet!"; } } } ``` MainUserControl.xaml ``` <UserControl x:Class="ProgramManagementV2.screens.MainUserControl" xmlns:we="clr-namespace:ProgramManagementV2.screens" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" mc:Ignorable="d" d:DesignHeight="300" d:DesignWidth="300"> <Grid> <TextBlock Height="23" HorizontalAlignment="Center" Name="textBlock1" Text="asdfasdf" VerticalAlignment="Center" /> </Grid> </UserControl> ``` MainUserControl.xaml.cs: ``` using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Windows; using System.Windows.Controls; using System.Windows.Data; using System.Windows.Documents; using System.Windows.Input; using System.Windows.Media; using System.Windows.Media.Imaging; using System.Windows.Navigation; using System.Windows.Shapes; using System.ComponentModel; namespace ProgramManagementV2.screens { /// <summary> /// Interaction logic for MainUserControl.xaml /// </summary> public partial class MainUserControl : AScreenUserControl { public MainUserControl() { InitializeComponent(); } } } ``` As you can see I'm adding ``` xmlns:we="clr-namespace:ProgramManagementV2.screens" ``` to the user control xml but I'm still getting the error: Partial declarations of 'ProgramManagementV2.screens.MainUserControl' must not specify different base classes Can anyone explain to me what I'm doing wrong?