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POHow can a WPF UserControl inherit a WPF UserControl?
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  1. POHow can a WPF UserControl inherit a WPF UserControl?
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    copied!<p>The following WPF UserControl called <strong>DataTypeWholeNumber</strong> which works.</p> <p>Now I want to make a UserControl called <strong>DataTypeDateTime</strong> and <strong>DataTypeEmail</strong>, etc.</p> <p>Many of the Dependency Properties will be shared by all these controls and therefore I want to put <strong>their common methods into a BaseDataType</strong> and have each of these UserControls inherit from this base type.</p> <p>However, when I do that, I get the <strong><em>error: Partial Declaration may not have different base classes</em></strong>.</p> <p>So how can I implement inheritance with UserControls so shared functionality is all in the base class?</p> <pre><code>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()); } } </code></pre>
 

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