Convert Word document to PDF in Azure Functions v4

23 Jul 20267 minutes to read

Syncfusion^® DocIO is a .NET Core Word library used to create, read, edit, and convert Word documents programmatically without Microsoft Word or interop dependencies. Using this library, you can convert a Word document to PDF in Azure Functions v4.

Steps to convert a Word document to PDF in Azure Functions v4

Step 1: Create a new Azure Functions project with the HTTP trigger template and select the function worker as .NET 8.0 Isolated (Long Term Support).

Step 2: Create a project name and select the location.

Step 3: Configure the project’s additional information (Storage account, Authorization level).

Step 4: Install the Syncfusion.DocIORenderer.Net.Core NuGet package in your project from NuGet.org.

NOTE

Starting with v16.2.0.x, if you reference Syncfusion^® assemblies from trial setup or from the NuGet feed, you also have to add the “Syncfusion.Licensing” assembly reference and include a license key in your projects. Please refer to this link to know about registering the Syncfusion^® license key in your application to use our components.

Step 5: Include the following namespaces in the Function1.cs file.

C#

using System.IO;
using System.Net;
using System.Threading.Tasks;
using Microsoft.Azure.Functions.Worker;
using Microsoft.Azure.Functions.Worker.Http;
using Syncfusion.DocIO;
using Syncfusion.DocIO.DLS;
using Syncfusion.DocIORenderer;
using Syncfusion.Pdf;

Step 6: Add the following code snippet in the Run method of the Function1 class to perform Word to PDF conversion in Azure Functions and return the resultant PDF document to the client end.

C#

//Gets the input Word document as stream from request
Stream stream = req.Content.ReadAsStreamAsync().Result;
//Loads an existing Word document
using (WordDocument document = new WordDocument(stream, FormatType.Docx))
{
    //Creates an instance of the DocIORenderer
    using (DocIORenderer render = new DocIORenderer())
    {
        //Converts Word document into PDF document
        using (PdfDocument pdfDocument = render.ConvertToPDF(document))
        {
            MemoryStream memoryStream = new MemoryStream();
            //Saves the PDF file
            pdfDocument.Save(memoryStream);
            //Reset the memory stream position
            memoryStream.Position = 0;
            //Create the response to return
            HttpResponseMessage response = new HttpResponseMessage(HttpStatusCode.OK);
            //Set the Word document saved stream as content of response
            response.Content = new ByteArrayContent(memoryStream.ToArray());
            //Set the contentDisposition as attachment
            response.Content.Headers.ContentDisposition = new ContentDispositionHeaderValue("attachment")
            {
                FileName = "Sample.Pdf"
            };
            //Set the content type as Word document mime type
            response.Content.Headers.ContentType = new System.Net.Http.Headers.MediaTypeHeaderValue("application/pdf");
            //Return the response with output Word document stream
            return response;
        }
    }
}

Step 7: Right-click the project and select Publish. Then, create a new profile in the Publish Window.

Step 8: Select the target as Azure and click the Next button.

Step 9: Select the Create new button.

Step 10: Click the Create button.

Step 11: After creating the app service, click the Finish button.

Step 12: Click the Publish button.

Step 13: Publishing succeeded.

Step 14: Now, go to the Azure portal and select the App Services. After running the service, click Get function URL and copy it. Then, paste it in the below client sample (which will request the Azure Functions, to perform Word to PDF conversion using the template Word document). You will get the output PDF document as follows.

Steps to post the request to Azure Functions

Step 1: Create a .NET console application to request the Azure Functions API.

Step 2: Add the following code snippet into the Main method to post the request to Azure Functions with the template Word document and get the resultant PDF document.

C#

//Reads the template Word document.
FileStream fs = new FileStream(@"../../Data/Input.docx", FileMode.Open, FileAccess.ReadWrite, FileShare.ReadWrite);
fs.Position = 0;
//Saves the Word document in memory stream.
MemoryStream inputStream = new MemoryStream();
fs.CopyTo(inputStream);
inputStream.Position = 0;
try
{
    Console.WriteLine("Please enter your Azure Functions URL :");
    string functionURL = Console.ReadLine();
    //Create HttpWebRequest with hosted azure functions URL.    
    HttpWebRequest req = (HttpWebRequest)WebRequest.Create(functionURL);
    //Set request method as POST
    req.Method = "POST";
    //Get the request stream to save the Word document stream
    Stream stream = req.GetRequestStream();
    //Write the Word document stream into request stream
    stream.Write(inputStream.ToArray(), 0, inputStream.ToArray().Length);
    //Gets the responce from the Azure Functions.
    HttpWebResponse res = (HttpWebResponse)req.GetResponse();
    //Saves the PDF document stream.
    FileStream fileStream = File.Create("DocToPDF.pdf");
    res.GetResponseStream().CopyTo(fileStream);
    //Dispose the streams
    inputStream.Dispose();
    fileStream.Dispose();
}
catch (Exception ex)
{
    throw;
}

From GitHub, you can download the console application and Azure Functions v4.

Looking for the full .NET Word Library overview, features, pricing, and documentation? Visit the .NET Word Library page.

An online sample link to convert Word document to PDF in ASP.NET Core.