.NET Document Rendering API – New Features

HTML Minification

When you are looking for the ways to optimize the rendering of documents into HTML, one of the solutions you might want to use is the compression of the output content (HTML, CSS, and SVG). This solution is suitable in case you are providing your content from the web server over the internet. GroupDocs.Viewer provides EnableMinification property of HtmlOptions class that lets you get output content minified (as shown in below code sample).

// Setup GroupDocs.Viewer config
ViewerConfig config = new ViewerConfig();
config.StoragePath = @"C:\storage";
  
// Create HTML handler
ViewerHtmlHandler htmlHandler = new ViewerHtmlHandler(config);
string guid = "document.docx";
  
HtmlOptions options = new HtmlOptions();
options.EnableMinification = true;
List pages = htmlHandler.GetPages(guid, options);
  
foreach (PageHtml page in pages)
{
    Console.WriteLine("Page number: {0}", page.PageNumber);
    Console.WriteLine("Html content: {0}", page.HtmlContent);
}

Currently, minification is only applied to HTML. However, we are going to provide minification for CSS as well in upcoming versions of the API. For more details, please visit this documentation article.

Rendering MS Project Document with Custom Page Size and Time Unit

When you are rendering MS Project documents into image, HTML or PDF, GroupDocs.Viewer API tries to find optimal output size and time unit depending on the project’s overall length. In case you need to set your own page size or time unit, you can set ProjectOptions class properties of corresponding  RenderOptions  (HtmlOptions or ImageOptions) or PdfFileOptions class for rendering into PDF,  as shown in the example below.

// Setup GroupDocs.Viewer config
ViewerConfig config = new ViewerConfig();
config.StoragePath = @"C:\storage";
   
// Create image handler
ViewerImageHandler imageHandler = new ViewerImageHandler(config);
string guid = "document.mpp";
   
// Set Project options to render content with a specified size and time unit.
ImageOptions options = new ImageOptions();
options.ProjectOptions.PageSize = PageSize.A2;
options.ProjectOptions.TimeUnit = TimeUnit.Days;
  
// Get pages 
List pages = imageHandler.GetPages(guid, options);
   
foreach (PageImage page in pages)
{
     Console.WriteLine("Page number: {0}", page.PageNumber); 
     Stream imageContent = page.Stream;
}

For more details on this feature, please visit this documentation article.

Removing Cache Files of a Specific Document

On the request of our valuable customers, we have added the support of removing cache files for a specific document. Following code sample demonstrates the usage of this feature.

//Init viewer config
ViewerConfig viewerConfig = new ViewerConfig();
viewerConfig.StoragePath = "c:\\storage"; 

// Init viewer image or HTML handler 
ViewerImageHandler viewerImageHandler = new ViewerImageHandler(viewerConfig); 

// Set the guid of the document you want to clear. 
string guid = "document.docx"; 

//Clear files from cache related to specified document. 
viewerImageHandler.ClearCache(guid);

For more details on clear cache feature, please visit this documentation article.

Support of ODG Format

Since version 17.12, we have added the support of rendering ODG (OpenDocument Graphics) file format.

Improved Rendering of JPEG Image as HTML

In previous versions of the API, the JPEG image was converted into PNG format ensuring the high quality of the image when it is displayed inside the HTML page. However, it was resulting in the bigger size of the output HTML page. Therefore, we have implemented the feature of rendering JPEG as HTML without converting image format to PNG.

Document Viewer API for .NET – Fixes

Following issues are fixed in version 17.12 of GroupDocs.Viewer for .NET.

• “Index was out of range” exception when rendering XLSX as PDF
• Blank output when rendering PDF document as HTML
• CAD document layouts with the size different than model are not rendered correctly
• Alignment of radio button text and checkbox text is not proper