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MinIO Client SDK for .NET

MinIO Client SDK provides higher level APIs for MinIO and Amazon S3 compatible cloud storage services.For a complete list of APIs and examples, please take a look at the Dotnet Client API Reference.This document assumes that you have a working VisualStudio development environment.

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Install from NuGet

To install MinIO .NET package, run the following command in Nuget Package Manager Console.

PM> Install-Package Minio

MinIO Client Example for ASP.NET

When using AddMinio to add Minio to your ServiceCollection, Minio will also use any custom Logging providers you've added, like Serilog to output traces when enabled.

using Minio;
using Minio.DataModel.Args;

public static class Program
{
    var endpoint = "play.min.io";
    var accessKey = "minioadmin";
    var secretKey = "minioadmin";

    public static void Main(string[] args)
    {
        var builder = WebApplication.CreateBuilder();

        // Add Minio using the default endpoint
        builder.Services.AddMinio(accessKey, secretKey);

        // Add Minio using the custom endpoint and configure additional settings for default MinioClient initialization
        builder.Services.AddMinio(configureClient => configureClient
            .WithEndpoint(endpoint)
            .WithCredentials(accessKey, secretKey)
	    .Build());

        // NOTE: SSL and Build are called by the build-in services already.

        var app = builder.Build();
        app.Run();
    }
}

[ApiController]
public class ExampleController : ControllerBase
{
    private readonly IMinioClient minioClient;

    public ExampleController(IMinioClient minioClient)
    {
        this.minioClient = minioClient;
    }

    [HttpGet]
    [ProducesResponseType(typeof(string), StatusCodes.Status200OK)]
    public async Task<IActionResult> GetUrl(string bucketID)
    {
        return Ok(await minioClient.PresignedGetObjectAsync(new PresignedGetObjectArgs()
                .WithBucket(bucketID))
            .ConfigureAwait(false));
    }
}

[ApiController]
public class ExampleFactoryController : ControllerBase
{
    private readonly IMinioClientFactory minioClientFactory;

    public ExampleFactoryController(IMinioClientFactory minioClientFactory)
    {
        this.minioClientFactory = minioClientFactory;
    }

    [HttpGet]
    [ProducesResponseType(typeof(string), StatusCodes.Status200OK)]
    public async Task<IActionResult> GetUrl(string bucketID)
    {
        var minioClient = minioClientFactory.CreateClient(); //Has optional argument to configure specifics

        return Ok(await minioClient.PresignedGetObjectAsync(new PresignedGetObjectArgs()
                .WithBucket(bucketID))
            .ConfigureAwait(false));
    }
}

MinIO Client Example

To connect to an Amazon S3 compatible cloud storage service, you need the following information

Variable nameDescription
endpoint<Domain-name> or <ip:port> of your object storage
accessKeyUser ID that uniquely identifies your account
secretKeyPassword to your account
secureboolean value to enable/disable HTTPS support (default=true)

The following examples uses a freely hosted public MinIO service "play.min.io" for development purposes.

using Minio;

var endpoint = "play.min.io";
var accessKey = "minioadmin";
var secretKey = "minioadmin";
var secure = true;
// Initialize the client with access credentials.
private static IMinioClient minio = new MinioClient()
                                    .WithEndpoint(endpoint)
                                    .WithCredentials(accessKey, secretKey)
                                    .WithSSL(secure)
                                    .Build();

// Create an async task for listing buckets.
var getListBucketsTask = await minio.ListBucketsAsync().ConfigureAwait(false);

// Iterate over the list of buckets.
foreach (var bucket in getListBucketsTask.Result.Buckets)
{
    Console.WriteLine(bucket.Name + " " + bucket.CreationDateDateTime);
}

Complete File Uploader Example

This example program connects to an object storage server, creates a bucket and uploads a file to the bucket. To run the following example, click on [Link] and start the project

using System;
using Minio;
using Minio.Exceptions;
using Minio.DataModel;
using Minio.Credentials;
using Minio.DataModel.Args;
using System.Threading.Tasks;

namespace FileUploader
{
    class FileUpload
    {
        static void Main(string[] args)
        {
            var endpoint  = "play.min.io";
            var accessKey = "minioadmin";
            var secretKey = "minioadmin";
            try
            {
                var minio = new MinioClient()
                                    .WithEndpoint(endpoint)
                                    .WithCredentials(accessKey, secretKey)
                                    .WithSSL()
                                    .Build();
                FileUpload.Run(minio).Wait();
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
            }
            Console.ReadLine();
        }

        // File uploader task.
        private async static Task Run(IMinioClient minio)
        {
            var bucketName = "mymusic";
            var location   = "us-east-1";
            var objectName = "golden-oldies.zip";
            var filePath = "C:\\Users\\username\\Downloads\\golden_oldies.mp3";
            var contentType = "application/zip";

            try
            {
                // Make a bucket on the server, if not already present.
                var beArgs = new BucketExistsArgs()
                    .WithBucket(bucketName);
                bool found = await minio.BucketExistsAsync(beArgs).ConfigureAwait(false);
                if (!found)
                {
                    var mbArgs = new MakeBucketArgs()
                        .WithBucket(bucketName);
                    await minio.MakeBucketAsync(mbArgs).ConfigureAwait(false);
                }
                // Upload a file to bucket.
                var putObjectArgs = new PutObjectArgs()
                    .WithBucket(bucketName)
                    .WithObject(objectName)
                    .WithFileName(filePath)
                    .WithContentType(contentType);
                await minio.PutObjectAsync(putObjectArgs).ConfigureAwait(false);
                Console.WriteLine("Successfully uploaded " + objectName );
            }
            catch (MinioException e)
            {
                Console.WriteLine("File Upload Error: {0}", e.Message);
            }
        }
    }
}

Running MinIO Client Examples

On Windows

  //Cases.MakeBucket.Run(minioClient, bucketName).Wait();

On Linux

Setting .NET SDK on Linux (Ubuntu 22.04)

<blockquote> NOTE: minio-dotnet requires .NET 6.x SDK to build on Linux. </blockquote> 
wget https://packages.microsoft.com/config/ubuntu/22.04/packages-microsoft-prod.deb -O packages-microsoft-prod.deb
sudo dpkg -i packages-microsoft-prod.deb
rm packages-microsoft-prod.deb

sudo apt-get update; \
  sudo apt-get install -y apt-transport-https && \
  sudo apt-get update && \
  sudo apt-get install -y dotnet-sdk-6.0

Running Minio.Examples

$ git clone https://github.com/minio/minio-dotnet && cd minio-dotnet

  //Cases.MakeBucket.Run(minioClient, bucketName).Wait();

dotnet build --configuration Release --no-restore
dotnet pack ./Minio/Minio.csproj --no-build --configuration Release --output ./artifacts
dotnet test ./Minio.Tests/Minio.Tests.csproj

Bucket Operations

Bucket policy Operations

Bucket notification Operations

File Object Operations

Object Operations

Presigned Operations

Client Custom Settings

Explore Further