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此示例显示如何创建突出显示页面上所选文本的标记注释。 要为选定文本创建此注释，请参考PdfViewerControl.HighlightSelectedText方法。

要在创建标记注释时指定注释属性，请参考PdfViewerControl.TextMarkupAnnotationCreating事件。

PdfViewerControl.HighlightSelectedText方法

突出显示所选文本。

重载列表

1.突出显示所选文本。

public void HighlightSelectedText()

Public Sub HighlightSelectedText()

2.突出显示所选文本，并在此文本中添加注释，该注释将显示在弹出窗口中。

public void HighlightSelectedText( 
   string comment 
)

Public Sub HighlightSelectedText( 
   ByVal comment As String 
)

3.突出显示具有指定颜色的选定文本。

public void HighlightSelectedText( 
   Color color 
)

Public Sub HighlightSelectedText( 
   ByVal color As Color 
)

4.使用颜色突出显示所选文本，并在此文本中添加注释，该注释将显示在弹出窗口中。

public void HighlightSelectedText( 
   string comment,  
   Color color 
)

Public Sub HighlightSelectedText( 
   ByVal comment As String,  
   ByVal color As Color 
)

PdfViewerControl.TextMarkupAnnotationCreating事件

在创建文本标记注释（突出显示，删除线或下划线）时发生。

public event PdfTextMarkupAnnotationCreatingEventHandler TextMarkupAnnotationCreating

event Public TextMarkupAnnotationCreating As PdfTextMarkupAnnotationCreatingEventHandler

此示例显示如何创建突出显示所选文本的标记注释。 要为选定文本创建此注释，请调用HighlightSelectedText重载方法之一。

要在创建标记注释时指定注释属性，请处理TextMarkupAnnotationCreating事件。

using System.Windows;
using DevExpress.Pdf;
using DevExpress.Xpf.PdfViewer;

namespace MarkupAnnotations {

    public partial class MainWindow : Window {
        public MainWindow() {
            InitializeComponent();

            // Load a document. 
            viewer.OpenDocument("..\\..\\Demo.pdf");

            // Handle the TextMarkupAnnotationCreating event to specify the annotation properties. 
            viewer.TextMarkupAnnotationCreating += Viewer_TextMarkupAnnotationCreating;

        }

        private void Viewer_TextMarkupAnnotationCreating(DependencyObject d, PdfTextMarkupAnnotationCreatingEventArgs e) {
            e.Author = "John Smith";
            e.Comment = "Note.";
            e.Color = System.Windows.Media.Color.FromRgb(229, 214, 0);
        }

        private void viewer_DocumentLoaded(object sender, RoutedEventArgs e) {

            // Select the document area where the markup annotation will be created. 
            viewer.Select(new PdfDocumentArea(1, new PdfRectangle(90, 100, 240, 230)));

            // Highlight a selected text. 
            viewer.HighlightSelectedText();
        }
    }
}

<Window
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
        xmlns:local="clr-namespace:MarkupAnnotations" 
        xmlns:dxpdf="http://schemas.devexpress.com/winfx/2008/xaml/pdf" x:Class="MarkupAnnotations.MainWindow" 
        mc:Ignorable="d" 
        Title="MainWindow" Height="350" Width="525">
    <Grid>

        <dxpdf:PdfViewerControl x:Name="viewer" DocumentLoaded="viewer_DocumentLoaded"/>

    </Grid>
</Window>

Imports System.Windows
Imports DevExpress.Pdf
Imports DevExpress.Xpf.PdfViewer

Namespace MarkupAnnotations

    Partial Public Class MainWindow
        Inherits Window

        Public Sub New()
            InitializeComponent()

            ' Load a document. 
            viewer.OpenDocument("..\..\Demo.pdf")

            ' Handle the TextMarkupAnnotationCreating event to specify the annotation properties. 
            AddHandler viewer.TextMarkupAnnotationCreating, AddressOf Viewer_TextMarkupAnnotationCreating

        End Sub 

        Private Sub Viewer_TextMarkupAnnotationCreating(ByVal d As DependencyObject, ByVal e As PdfTextMarkupAnnotationCreatingEventArgs)
            e.Author = "John Smith" 
            e.Comment = "Note." 
            e.Color = System.Windows.Media.Color.FromRgb(229, 214, 0)
        End Sub 

        Private Sub viewer_DocumentLoaded(ByVal sender As Object, ByVal e As RoutedEventArgs)

            ' Select the document area where the markup annotation will be created. 
            viewer.Select(New PdfDocumentArea(1, New PdfRectangle(90, 100, 240, 230)))

            ' Highlight a selected text. 
            viewer.HighlightSelectedText()
        End Sub 
    End Class 
End Namespace 

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