我创建了一个自定义UserControl,它公开了一些DependencyProperty,如HeaderTitle和HeaderTitleForeground
public partial class PageHeaderControl : UserControl
{
public string HeaderTitle
{
get { return (string)GetValue(HeaderTitleProperty); }
set { SetValue(HeaderTitleProperty, value); }
}
public static readonly DependencyProperty HeaderTitleProperty = DependencyProperty.Register("HeaderTitle", typeof(string), typeof(PageHeaderControl), new PropertyMetadata(""));
public string HeaderTitleForeground
{
get { return (string)GetValue(HeaderTitleForegroundProperty); }
set { SetValue(HeaderTitleForegroundProperty, value); }
}
public static readonly DependencyProperty HeaderTitleForegroundProperty = DependencyProperty.Register("HeaderTitleForeground", typeof(string), typeof(PageHeaderControl), new PropertyMetadata(""));
public PageHeaderControl()
{
InitializeComponent();
(this.Content as FrameworkElement).DataContext = this;
}
}
但是当我调试我的应用程序时,它抛出了一个异常,如下所示:
System.Exception occurred
_HResult=-2146233088
_message=Error HRESULT E_FAIL has been returned from a call to a COM component.
HResult=-2146233088
Message=Error HRESULT E_FAIL has been returned from a call to a COM component.
Source=System.Windows
StackTrace:
at MS.Internal.XcpImports.CheckHResult(UInt32 hr)
InnerException:
但是,自定义控件是正确绘制的。那么,我该如何解决这个问题呢?这是一个关键问题吗?
您的类是PageHeaderControl
,但您的依赖项道具已向ElevationPageHeaderControl
注册为其所有者。。?
我发现了我的错误。这是HeaderTitleForeground的类型,所以我只是从字符串改为SolidColorBrush,并将SolidColorBruch(Colors.Black)添加到PropertyMetadata中。以下是UserControl的固定版本:
public partial class PageHeaderControl : UserControl
{
public string HeaderTitle
{
get { return (string)GetValue(HeaderTitleProperty); }
set { SetValue(HeaderTitleProperty, value); }
}
public static readonly DependencyProperty HeaderTitleProperty = DependencyProperty.Register("HeaderTitle", typeof(string), typeof(PageHeaderControl), new PropertyMetadata(""));
public SolidColorBrush HeaderTitleForeground
{
get { return (SolidColorBrush)GetValue(HeaderTitleForegroundProperty); }
set { SetValue(HeaderTitleForegroundProperty, value); }
}
public static readonly DependencyProperty HeaderTitleForegroundProperty = DependencyProperty.Register("HeaderTitleForeground", typeof(SolidColorBrush), typeof(PageHeaderControl), new PropertyMetadata(new SolidColorBrush(Colors.Black)));
public PageHeaderControl()
{
InitializeComponent();
(this.Content as FrameworkElement).DataContext = this;
}
}