Configure your AWS credentials in appsettings.json . For better security, use IAM roles in production instead of hardcoding keys. 2. Method 1: Using AmazonS3Client (Standard Stream)
public async Task DownloadFileAsync(string bucketName, string fileKey) { using var client = new AmazonS3Client(); var request = new GetObjectRequest { BucketName = bucketName, Key = fileKey }; using GetObjectResponse response = await client.GetObjectAsync(request); using var responseStream = response.ResponseStream; using var memoryStream = new MemoryStream(); await responseStream.CopyToAsync(memoryStream); return memoryStream.ToArray(); } Use code with caution. 3. Method 2: Using TransferUtility (Large Files) download file from s3 bucket .net core
dotnet add package AWSSDK.S3 dotnet add package AWSSDK.Extensions.NETCore.Setup Use code with caution. Configure your AWS credentials in appsettings
Downloading files from an Amazon S3 bucket in .NET Core (including .NET 6, 7, and 8+) is a common task facilitated by the . Depending on your file size and security requirements, you can choose between a direct stream, a high-level transfer utility, or secure pre-signed URLs. 1. Prerequisites and Configuration Downloading files from an Amazon S3 bucket in
If you want the user's browser to download the file directly from S3 without passing through your server, generate a . This saves server bandwidth and prevents timeouts for massive files.
The standard way to download a file is using the GetObjectAsync method. This returns a stream, which is ideal for small to medium files that you want to serve directly to a user or process in memory.
var config = new TransferUtilityConfig { ConcurrentServiceRequests = 10 }; var transferUtility = new TransferUtility(client, config); await transferUtility.DownloadAsync(new TransferUtilityDownloadRequest { BucketName = "my-bucket", Key = "large-video.mp4", FilePath = @"C:\Downloads\large-video.mp4" }); Use code with caution. 4. Method 3: Pre-signed URLs (Direct Access)