Open and Save Word document in Azure Blob Cloud Storage

Prerequisites

Microsoft Azure subscription is required.
Azure Cloud Storage is required.

Open Word document from Azure Blob

Steps to open a Word document from Azure Blob Cloud Storage.

Step 1: Create a new ASP.NET Core Web Application (Model-View-Controller).

Create a ASP.NET Core Web App project in visual studio

Step 2: Name the project.

Name the project

Step 3: Install the following Nuget packages in your application from NuGet.org.

Install Syncfusion.DocIO.Net.Core NuGet Package
Install Azure.Storage.Blobs NuGet Package

Step 4: Add a new button in the Index.cshtml as shown below.

CSHTML
@{Html.BeginForm("EditDocument", "Home", FormMethod.Get);
    {
        <div>
            <input type="submit" value="Edit Document" style="width:150px;height:27px" />
        </div>
    }
    Html.EndForm();
}

Step 5: Include the following namespaces in HomeController.cs.

C#
using Azure.Storage.Blobs.Models;
using Azure.Storage.Blobs;
using Syncfusion.DocIO.DLS;

Step 6: Include the below code snippet in HomeController.cs to open a Word document from Azure Blob Cloud Storage.

C#
public async Task<IActionResult> EditDocument()
{
    try
    {
        //Retrieve the document from Azure
        MemoryStream stream = await GetDocumentFromAzure();

        //Set the position to the beginning of the MemoryStream
        stream.Position = 0;

        //Create an instance of WordDocument
        using (WordDocument wordDocument = new WordDocument(stream, Syncfusion.DocIO.FormatType.Docx))
        {
            //Access the section in a Word document
            IWSection section = wordDocument.Sections[0];

            //Add new paragraph to the section
            IWParagraph paragraph = section.AddParagraph();
            paragraph.ParagraphFormat.FirstLineIndent = 36;
            paragraph.BreakCharacterFormat.FontSize = 12f;

            //Add new text to the paragraph
            IWTextRange textRange = paragraph.AppendText("In 2000, AdventureWorks Cycles bought a small manufacturing plant, Importadores Neptuno, located in Mexico. Importadores Neptuno manufactures several critical subcomponents for the AdventureWorks Cycles product line. These subcomponents are shipped to the Bothell location for final product assembly. In 2001, Importadores Neptuno, became the sole manufacturer and distributor of the touring bicycle product group.") as IWTextRange;
            textRange.CharacterFormat.FontSize = 12f;

            //Saving the Word document to a MemoryStream
            MemoryStream outputStream = new MemoryStream();
            wordDocument.Save(outputStream, Syncfusion.DocIO.FormatType.Docx);

            //Download the Word file in the browser
            FileStreamResult fileStreamResult = new FileStreamResult(outputStream, "application/msword");
            fileStreamResult.FileDownloadName = "EditWord.docx";
            return fileStreamResult;
        }
    }
    catch (Exception ex)
    {
        Console.WriteLine($"Error: {ex.Message}");
        return Content("Error occurred while processing the file.");
    }
}

Download file from Azure Blob cloud storage

This is the helper method to download Word document from Azure Blob cloud storage.

C#
/// <summary>
/// Download file from Azure Blob cloud storage
/// </summary>
/// <returns></returns>
public async Task<MemoryStream> GetDocumentFromAzure()
{
    try
    {
        //Your Azure Storage Account connection string
        string connectionString = "Your_connection_string";

        //Name of the Azure Blob Storage container
        string containerName = "Your_container_name";

        //Name of the Word file you want to load
        string blobName = "WordTemplate.docx";

        //Download the Word document from Azure Blob Storage
        BlobServiceClient blobServiceClient = new BlobServiceClient(connectionString);
        BlobContainerClient containerClient = blobServiceClient.GetBlobContainerClient(containerName);
        BlobClient blobClient = containerClient.GetBlobClient(blobName);
        BlobDownloadInfo download = await blobClient.DownloadAsync();

        //Create a MemoryStream to copy the file content
        MemoryStream stream = new MemoryStream();
        await download.Content.CopyToAsync(stream);

        return stream;
    }
    catch (Exception ex)
    {
        Console.WriteLine($"Error retrieving document from Azure Blob Storage: {ex.Message}");
        throw; // or handle the exception as needed
    }
}

You can download a complete working sample from GitHub.

By executing the program, you will get the Word document as follows.

Output Word document

Save Word document to Azure Blob

Steps to save a Word document to Azure Blob Cloud Storage.