AnnotationStore.DeleteAnnotation(Guid) 方法

定义

命名空间:

System.Windows.Annotations.Storage

程序集:

PresentationFramework.dll

从存储区中删除具有指定 Id 的批注。

public:
 abstract System::Windows::Annotations::Annotation ^ DeleteAnnotation(Guid annotationId);

public abstract System.Windows.Annotations.Annotation DeleteAnnotation (Guid annotationId);

abstract member DeleteAnnotation : Guid -> System.Windows.Annotations.Annotation

Public MustOverride Function DeleteAnnotation (annotationId As Guid) As Annotation

参数

annotationId

Guid

要删除的注释的 GUID Id 属性。

返回

Annotation

已删除的批注；如果在存储区中未找到具有指定 null 的批注，则为 annotationId。

例外

ObjectDisposedException

已在存储区上调用 Dispose。

示例

以下示例演示了 DeleteAnnotation 如何使用和 Flush 方法。

// ------------------------- DeleteMark_Click -------------------------
void DeleteMark_Click(object sender, RoutedEventArgs e)
{
    Annotation ann = ((MenuItem)sender).Tag as Annotation;
    _annStore.DeleteAnnotation(ann.Id);
    _annStore.Flush();

    MenuItem thisMenu = sender as MenuItem;
    ContextMenu parentMenu = thisMenu.Parent as ContextMenu;
    FrameworkElement dObj =
        parentMenu.PlacementTarget as FrameworkElement;
    while (!(dObj is StackPanel))
    {
        dObj = dObj.Parent as FrameworkElement;
    }

    ListBox collection = dObj.Parent as ListBox;
    collection.Items.Remove(dObj);
    Util.FlushDispatcher();
}

另请参阅

• AddAnnotation(Annotation)
• GetAnnotation(Guid)
• GetAnnotations