HtmlDocumentExporterOptions.EmbedImages Property

Specifies whether images are embedded in an HTML document.

Namespace: DevExpress.XtraRichEdit.Export

Assembly: DevExpress.RichEdit.v19.1.Core.dll

Declaration

C#

[DefaultValue(false)]
public virtual bool EmbedImages { get; set; }

VB.NET

<DefaultValue(False)>
Public Overridable Property EmbedImages As Boolean

Property Value

Type	Default	Description
Boolean	**false**	true to embed images in a page; otherwise, false.

Property Paths

You can access this nested property as listed below:

Library	Object Type	Path to EmbedImages
WinForms Controls	RichTextEditDocumentExportOptions	.Mht.EmbedImages
Office File API	RichEditDocumentExportOptions	.Mht.EmbedImages

Remarks

Use the EmbedImages property to specify whether images should be embedded into a page, or stored externally. Embedded images in the HTML document are stored in base64 encoding.

Note

There are situations when the EmbedImages setting is disregarded. The SubDocument.GetHtmlText method with unspecified IUriProvider instance (set to null), Document.HtmlText and RichEditDocumentServer.HtmlText properties always return HTML string with embedded images.

Example

This example demonstrates how to use the DocumentImage.Uri property to set the image’s src attribute when a document is saved in HTML format. You can switch on the HtmlDocumentExporterOptions.EmbedImages option to observe that the custom URI provider is idle for embedded images.

Note

The complete sample project How to retain the original image URI in an HTML document is available in the DevExpress Examples repository.

Form1.cs

using DevExpress.Office.Services;
using DevExpress.XtraRichEdit.API.Native;
using DevExpress.XtraRichEdit.Export;
using System;
// ...
        private void richEditControl1_DocumentLoaded(object sender, EventArgs e)
        {
            IUriProviderService service = richEditControl1.GetService<IUriProviderService>();
            if (service != null) {
                service.RegisterProvider(new CustomUriProvider());
            }
        }
        private void richEditControl1_ContentChanged(object sender, EventArgs e)
        {
            ReloadHtml();
        }

        private void ReloadHtml()
        {
            HtmlDocumentExporterOptions exportOptions = new HtmlDocumentExporterOptions();
            exportOptions.EmbedImages = embedImagesCheck.Checked;
            string sText = richEditControl1.Document.GetHtmlText(richEditControl1.Document.Range, new CustomUriProvider(), exportOptions);
            memoEdit1.Text = sText;
        }

Form1.vb

Imports DevExpress.Office.Services
Imports DevExpress.XtraRichEdit.API.Native
Imports DevExpress.XtraRichEdit.Export
Imports System
' ...
        Private Sub richEditControl1_DocumentLoaded(ByVal sender As Object, ByVal e As EventArgs) Handles richEditControl1.DocumentLoaded
            Dim service As IUriProviderService = richEditControl1.GetService(Of IUriProviderService)()
            If service IsNot Nothing Then
                service.RegisterProvider(New CustomUriProvider())
            End If
        End Sub

        Private Sub richEditControl1_ContentChanged(ByVal sender As Object, ByVal e As EventArgs)
            ReloadHtml()
        End Sub

        Private Sub ReloadHtml()
            Dim exportOptions As New HtmlDocumentExporterOptions()
            exportOptions.EmbedImages = embedImagesCheck.Checked
            Dim sText As String = richEditControl1.Document.GetHtmlText(richEditControl1.Document.Range, New CustomUriProvider(), exportOptions)
            memoEdit1.Text = sText
        End Sub

CustomUriProvider.cs

using DevExpress.Office.Services;
using DevExpress.Office.Utils;
using System;
// ...
     public class CustomUriProvider : IUriProvider
     {
        public string CreateCssUri(string rootUri, string styleText, string relativeUri)
        {
            return String.Empty;
        }

        public string CreateImageUri(string rootUri, OfficeImage image, string relativeUri)
        {
            return image.Uri;
        }
    }

CustomUriProvider.vb

Imports DevExpress.Office.Services
Imports DevExpress.Office.Utils
Imports System
' ...
    Public Class CustomUriProvider
        Implements IUriProvider

        Public Function CreateCssUri(ByVal rootUri As String, ByVal styleText As String, ByVal relativeUri As String) As String Implements IUriProvider.CreateCssUri
            Return String.Empty
        End Function

        Public Function CreateImageUri(ByVal rootUri As String, ByVal image As OfficeImage, ByVal relativeUri As String) As String Implements IUriProvider.CreateImageUri
            Return image.Uri
        End Function
    End Class

Related GitHub Examples

The following code snippets (auto-collected from DevExpress Examples) contain references to the EmbedImages property.

Note

The algorithm used to collect these code examples remains a work in progress. Accordingly, the links and snippets below may produce inaccurate results. If you encounter an issue with code examples below, please use the feedback form on this page to report the issue.

C#

how-to-customize-copy-and-paste-commands-e3665/CS/RichEditCustomCopyPaste/CustomCommands.cs#L46

    exporterOptions.ExportRootTag = ExportRootTag.Body;
    exporterOptions.EmbedImages = false; // To delegate handling into a CustomUriProvider
}

how-to-retain-original-image-uri-in-html-document-e3189/CS/HTML_Export_ImageSourceExample/Form1.cs#L29

DevExpress.XtraRichEdit.Export.HtmlDocumentExporterOptions exportOptions = new DevExpress.XtraRichEdit.Export.HtmlDocumentExporterOptions();
exportOptions.EmbedImages = embedImagesCheck.Checked;
string sText = richEditControl1.Document.GetHtmlText(richEditControl1.Document.Range, new CustomUriProvider(), exportOptions);

dxrichedit-for-wpf-how-to-retain-original-image-uri-in-html-document-e3294/CS/HTML_Export_ImageSourceExample/MainWindow.xaml.cs#L29

DevExpress.XtraRichEdit.Export.HtmlDocumentExporterOptions exportOptions = new DevExpress.XtraRichEdit.Export.HtmlDocumentExporterOptions();
exportOptions.EmbedImages = (bool)embedImagesCheck.IsChecked;
string sText = richEditControl1.Document.GetHtmlText(richEditControl1.Document.Range, new CustomUriProvider(), exportOptions);

word-document-api-retain-image-uri-in-html-document/CS/RichEditDocumentServer_ImageSourceExample/Form1.cs#L33

HtmlDocumentExporterOptions exportOptions = new HtmlDocumentExporterOptions();
exportOptions.EmbedImages = embedImagesCheck.Checked;
string sText = server.Document.GetHtmlText(server.Document.Range, new CustomUriProvider(), exportOptions);

VB.NET

how-to-customize-copy-and-paste-commands-e3665/VB/CustomCommands.vb#L47

    exporterOptions.ExportRootTag = ExportRootTag.Body
    exporterOptions.EmbedImages = False ' To delegate handling into a CustomUriProvider
End If

how-to-retain-original-image-uri-in-html-document-e3189/VB/HTML_Export_ImageSourceExample/Form1.vb#L28

Dim exportOptions As New DevExpress.XtraRichEdit.Export.HtmlDocumentExporterOptions()
exportOptions.EmbedImages = embedImagesCheck.Checked
Dim sText As String = richEditControl1.Document.GetHtmlText(richEditControl1.Document.Range, New CustomUriProvider(), exportOptions)

dxrichedit-for-wpf-how-to-retain-original-image-uri-in-html-document-e3294/VB/HTML_Export_ImageSourceExample/MainWindow.xaml.vb#L31

Dim exportOptions As New DevExpress.XtraRichEdit.Export.HtmlDocumentExporterOptions()
exportOptions.EmbedImages = CBool(embedImagesCheck.IsChecked)
Dim sText As String = richEditControl1.Document.GetHtmlText(richEditControl1.Document.Range, New CustomUriProvider(), exportOptions)

word-document-api-retain-image-uri-in-html-document/VB/RichEditDocumentServer_ImageSourceExample/Form1.vb#L29

Dim exportOptions As New HtmlDocumentExporterOptions()
exportOptions.EmbedImages = embedImagesCheck.Checked
Dim sText As String = server.Document.GetHtmlText(server.Document.Range, New CustomUriProvider(), exportOptions)