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Home Interviews How can you integrate file handling with cloud storage? – MindStick
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1 Answers

ICSM Computer
ICSM Computer 16 May 2025
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To integrate file handling with cloud storage like Azure Blob Storage or Amazon S3 in C#, you can use their respective SDKs to upload, download, delete, and list files (blobs or objects). Here's a breakdown for each:

1. Azure Blob Storage

dotnet add package Azure.Storage.Blobs

Upload/Download Example:

using Azure.Storage.Blobs;
using System;
using System.IO;
using System.Threading.Tasks;

public class AzureBlobHelper
{
    private readonly BlobServiceClient _blobServiceClient;

    public AzureBlobHelper(string connectionString)
    {
        _blobServiceClient = new BlobServiceClient(connectionString);
    }

    public async Task UploadFileAsync(string containerName, string localFilePath, string blobName)
    {
        var container = _blobServiceClient.GetBlobContainerClient(containerName);
        await container.CreateIfNotExistsAsync();
        var blobClient = container.GetBlobClient(blobName);

        await blobClient.UploadAsync(localFilePath, overwrite: true);
    }

    public async Task DownloadFileAsync(string containerName, string blobName, string downloadPath)
    {
        var blobClient = _blobServiceClient
            .GetBlobContainerClient(containerName)
            .GetBlobClient(blobName);

        await blobClient.DownloadToAsync(downloadPath);
    }
}

2. Amazon S3 (AWS)

dotnet add package AWSSDK.S3

Upload/Download Example:

using Amazon.S3;
using Amazon.S3.Model;
using System;
using System.IO;
using System.Threading.Tasks;

public class S3Helper
{
    private readonly IAmazonS3 _s3Client;

    public S3Helper(string accessKey, string secretKey, string region)
    {
        _s3Client = new AmazonS3Client(accessKey, secretKey, Amazon.RegionEndpoint.GetBySystemName(region));
    }

    public async Task UploadFileAsync(string bucketName, string key, string filePath)
    {
        var request = new PutObjectRequest
        {
            BucketName = bucketName,
            Key = key,
            FilePath = filePath
        };

        await _s3Client.PutObjectAsync(request);
    }

    public async Task DownloadFileAsync(string bucketName, string key, string destinationPath)
    {
        var response = await _s3Client.GetObjectAsync(bucketName, key);
        await using var stream = File.Create(destinationPath);
        await response.ResponseStream.CopyToAsync(stream);
    }
}

Credentials & Security Tips

  1. Use environment variables or secure secrets storage (e.g., Azure Key Vault or AWS Secrets Manager).
  2. Avoid hardcoding keys in code. When to Use Each
Feature Azure Blob Amazon S3
.NET SDK Azure.Storage.Blobs AWSSDK.S3
Access Control SAS, RBAC IAM, Bucket Policies
URL Sharing SAS URLs Pre-Signed URLs
Serverless Azure Functions AWS Lambda
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