The following WPF UserControl called DataTypeWholeNumber which works.
Now I want to make a UserControl called DataTypeDateTime and DataTypeEmail, etc.
Many of the Dependency Properties will be shared by all these controls and therefore I want to put their common methods into a BaseDataType and have each of these UserControls inherit from this base type.
However, when I do that, I get the error: Partial Declaration may not have different base classes.
So how can I implement inheritance with UserControls so shared functionality is all in the base class?
using System.Windows;
using System.Windows.Controls;
namespace TestDependencyProperty827.DataTypes
{
public partial class DataTypeWholeNumber : BaseDataType
{
public DataTypeWholeNumber()
{
InitializeComponent();
DataContext = this;
//defaults
TheWidth = 200;
}
public string TheLabel
{
get
{
return (string)GetValue(TheLabelProperty);
}
set
{
SetValue(TheLabelProperty, value);
}
}
public static readonly DependencyProperty TheLabelProperty =
DependencyProperty.Register("TheLabel", typeof(string), typeof(BaseDataType),
new FrameworkPropertyMetadata());
public string TheContent
{
get
{
return (string)GetValue(TheContentProperty);
}
set
{
SetValue(TheContentProperty, value);
}
}
public static readonly DependencyProperty TheContentProperty =
DependencyProperty.Register("TheContent", typeof(string), typeof(BaseDataType),
new FrameworkPropertyMetadata());
public int TheWidth
{
get
{
return (int)GetValue(TheWidthProperty);
}
set
{
SetValue(TheWidthProperty, value);
}
}
public static readonly DependencyProperty TheWidthProperty =
DependencyProperty.Register("TheWidth", typeof(int), typeof(DataTypeWholeNumber),
new FrameworkPropertyMetadata());
}
}
Best Answer
Ensure that you have changed the first tag in the xaml to also inherit from your new basetype
So
becomes
So, to summarise the complete answer including the extra details from the comments below: