Upload and Download Files using Google Cloud Storage using C#

Today in this article we shall see how to Upload and Download files using C# – Google Cloud Storage.

We shall be using the C# Google storage library to upload files and also download files.

Today in this article, we will cover below aspects,

Getting Started

Create any .NET or .NET Core application.

Please Install Nuget package for Google.Apis.Auth

PM> Install-Package Google.Apis.Auth -Version 1.50.0

Install Google.Cloud.Storage.V1

Install Nuget package for Google.Cloud.Storage.V1

PM> Install-Package Google.Cloud.Storage.V1 -Version 3.4.0

Please add below using statements to your class files,

using Google.Apis.Storage.v1.Data;
using Google.Cloud.Storage.V1;

Upload a file to Google Cloud Storage

Below is a sample example for uploading a file to Google Cloud Storage.

We shall be uploading sample files from the local machine “CloudBlobTest.pdf” to google cloud storage.

            string filePath = @"C:\Test\gcp\cloud\CloudBlobTest.pdf";
            var gcsStorage = StorageClient.Create();
            using (var f = File.OpenRead(filePath))
            {
                string objectName = Path.GetFileName(filePath);
                gcsStorage.UploadObject(bucketName, objectName, null, f);
                Console.WriteLine($"Uploaded {objectName}.");
            }

The above code will upload the blob with the name “CloudBlobTest.pdf” to the google cloud storage location “thecodebuzz“.

Download a file from Google Storage Bucket

Blob can be downloaded from google storage bucket as a file easily by using the below storage class methods.

Sample example demonstrates how to download a file from google cloud storage bucket to the local machine file path.

Let’s download the same file i.e CloudBlobTest.pdf from the GCS bucket.

Downloaded blob from GCS will be saved to below output path,

     string fileDownloadPath = @"C:\Test\gcp\cloud\CloudBlobTest_Out.pdf";

            


            string objectBlobName = "CloudBlobTest.pdf";
            var gcsStorage = StorageClient.Create();
            using var outputFile = File.OpenWrite(fileDownloadPath);
            gcsStorage.DownloadObject(bucketName, objectBlobName, outputFile);

            Console.WriteLine($"Downloaded {objectBlobName} to {fileDownloadPath}.");

Once executed the file will be downloaded to the local path successfully.

Please make sure to set up Environment Variable “GOOGLE_APPLICATION_CREDENTIALS” using the service account JSON file.

Environment.SetEnvironmentVariable("GOOGLE_APPLICATION_CREDENTIALS", "secured-key.json");

References:

• Enable Google Cloud IAP Authentication (OIDC) using ASP.NET Core

Do you have any comments or ideas or any better suggestions to share?

Please sound off your comments below.

Happy Coding !!

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