Load Microsoft Office files in Blazor PDF Viewer Component
3 Feb 20238 minutes to read
The PDF Viewer library allows you to load Microsoft office files such as powerpoint, excel, word and image using the success event of uploader.
In the below code, word document is converted in to pdf document and return that pdf document into base64 string which then loaded in to the PDF Viewer. Similarly, loaded the powerpoint, excel and image in to the PDF Viewer.
@page "/"
@using Syncfusion.Blazor.PdfViewerServer
@using Syncfusion.Blazor.PdfViewer
@using Syncfusion.Pdf;
@using Syncfusion.Pdf.Graphics;
@using Syncfusion.Pdf.Interactive;
@using Syncfusion.Pdf.Parsing;
@using Syncfusion.Pdf.Security;
@using Syncfusion.Blazor.Inputs;
@using Syncfusion.DocIO;
@using WFormatType = Syncfusion.DocIO.FormatType;
@using Syncfusion.Presentation;
@using Syncfusion.PresentationRenderer;
@using Syncfusion.XlsIO;
@using Syncfusion.XlsIORenderer
@using Syncfusion.DocIORenderer;
@using System.IO;
<SfUploader AllowedExtensions=".doc, .docx, .rtf, .docm, .dotm, .dotx, .dot, .xls, .xlsx, .pptx, .pptm, .potx, .potm .jpeg, .png, .bmp">
<UploaderEvents OnUploadStart="OnSuccess"></UploaderEvents>
<UploaderAsyncSettings SaveUrl="https://aspnetmvc.syncfusion.com/services/api/uploadbox/Save"
RemoveUrl="https://aspnetmvc.syncfusion.com/services/api/uploadbox/Remove"></UploaderAsyncSettings>
</SfUploader>
<SfPdfViewerServer @ref="viewerInstance" Height="500px" Width="1060px" ToolbarSettings="@ToolbarSettings"></SfPdfViewerServer>
@code {
SfPdfViewerServer viewerInstance;
public PdfViewerToolbarSettings ToolbarSettings = new PdfViewerToolbarSettings()
{
ToolbarItems = new List<ToolbarItem>()
{
ToolbarItem.PageNavigationTool,
ToolbarItem.MagnificationTool,
ToolbarItem.CommentTool,
ToolbarItem.SelectionTool,
ToolbarItem.PanTool,
ToolbarItem.UndoRedoTool,
ToolbarItem.CommentTool,
ToolbarItem.AnnotationEditTool,
ToolbarItem.SearchOption,
ToolbarItem.PrintOption,
ToolbarItem.DownloadOption,
ToolbarItem.SubmitForm,
}
};
private void OnSuccess(UploadingEventArgs action)
{
string base64 = action.FileData.RawFile.ToString();
//string fileName = args.FileData[0].Name;
string type = action.FileData.Type.ToLower();
string data = base64.Split(',')[1];
byte[] bytes = Convert.FromBase64String(data);
var outputStream = new MemoryStream();
Syncfusion.Pdf.PdfDocument pdfDocument = new Syncfusion.Pdf.PdfDocument();
using (Stream stream = new MemoryStream(bytes))
{
switch (type)
{
case "docx":
case "dot":
case "doc":
case "dotx":
case "docm":
case "dotm":
case "rtf":
Syncfusion.DocIO.DLS.WordDocument doc = new Syncfusion.DocIO.DLS.WordDocument(stream, GetWFormatType(type));
//Initialization of DocIORenderer for Word to PDF conversion
DocIORenderer render = new DocIORenderer();
//Converts Word document into PDF document
pdfDocument = render.ConvertToPDF(doc);
doc.Close();
break;
case "pptx":
case "pptm":
case "potx":
case "potm":
//Loads or open an PowerPoint Presentation
IPresentation pptxDoc = Presentation.Open(stream);
pdfDocument = PresentationToPdfConverter.Convert(pptxDoc);
pptxDoc.Close();
break;
case "xlsx":
case "xls":
ExcelEngine excelEngine = new ExcelEngine();
//Loads or open an existing workbook through Open method of IWorkbooks
IWorkbook workbook = excelEngine.Excel.Workbooks.Open(stream);
//Initialize XlsIO renderer.
XlsIORenderer renderer = new XlsIORenderer();
//Convert Excel document into PDF document
pdfDocument = renderer.ConvertToPDF(workbook);
workbook.Close();
break;
case "jpeg":
case "jpg":
case "png":
case "bmp":
//Add a page to the document.
PdfPage page = pdfDocument.Pages.Add();
//Create PDF graphics for the page.
PdfGraphics graphics = page.Graphics;
PdfBitmap image = new PdfBitmap(stream);
//Draw the image.
graphics.DrawImage(image, 0, 0);
break;
}
pdfDocument.Save(outputStream);
outputStream.Position = 0;
loadPDFdocument(outputStream.ToArray());
pdfDocument.Close();
outputStream.Close();
}
}
public void loadPDFdocument(byte[] bytes)
{
// Convert a PDF document into a base64 string.
string base64String = Convert.ToBase64String(bytes);
// Load the base64 string in the PDF Viewer.
viewerInstance.LoadAsync("data:application/pdf;base64," + base64String, null);
}
}