Question

下面是打开/来自文件

的注释的代码

如何将注释加载并保存到数据库？

数据库是MS SQL Server，我知道如何读写text，xml和binary。只需要知道使用什么类型的流以及如何使用它。

我宁愿不保持与数据库打开的连接。有点像读取然后保存在内存然后写？

using System.Windows.Annotations;

private FileStream streamAnno;

private void Page_Loaded(object sender, RoutedEventArgs e)
{          
    /// Creates an annotation service based on
    /// a FlowDocumentReader control.
    AnnotationService service = AnnotationService.GetService(FlowDocumentPageViewer1);

    /// Checks if the service has not been instantiated.
    if (service == null)
    {
        /// Instantiates a FileStream object.
        streamAnno = new FileStream("tip100annotations.xml", FileMode.OpenOrCreate);

        /// Instantiates the annotation service.
        service = new AnnotationService(FlowDocumentPageViewer1);

        /// Creates an annotation store using the derived
        /// XmlStreamStore object and the FileStream object.
        System.Windows.Annotations.Storage.AnnotationStore store = new System.Windows.Annotations.Storage.XmlStreamStore(streamAnno);

        /// Sets the AutoFlush property to true to ensure
        /// that every annotation is flushed to the store automatically.
        store.AutoFlush = true;

        /// Enables the annotation service.
        service.Enable(store);
    }
}

private void Page_Unloaded(object sender, RoutedEventArgs e)
{
    /// Tries to get the annotation service.
    AnnotationService service = AnnotationService.GetService(FlowDocumentPageViewer1);

    /// If the annotation service is valid and is enabled
    if (service != null && service.IsEnabled)
    {
        /// Disables the service.
        service.Disable();

        /// Closes the stream
        /// 
        if (streamAnno != null)
        {
            streamAnno.Close();
        }
    }
}

Answer 1

认为我用内存流解决了

流作为varbinary（max）

存储在SQL中

streamAnnoMem = new MemoryStream();
if (viewRawTextSdocsID != null)
{
    byte[] annotation = AnnotationGetUser((int)viewRawTextSdocsID);
    if (annotation.Length > 0)
    {                     
        streamAnnoMem.Write(annotation, 0, annotation.Length);
        streamAnnoMem.Position = 0;
    }
}

/// Instantiates the annotation service.
service = new AnnotationService(FlowDocumentPageViewer1);

/// Creates an annotation store using the derived
/// XmlStreamStore object and the FileStream object.
System.Windows.Annotations.Storage.AnnotationStore store = new System.Windows.Annotations.Storage.XmlStreamStore(streamAnnoMem);

/// Sets the AutoFlush property to true to ensure
/// that every annotation is flushed to the store automatically.
store.AutoFlush = true;

/// Enables the annotation service.
service.Enable(store);

AnnotationServiceActive = true;

将注释存储在数据库中

1 个答案: