.NET/C# client library for Apache Pulsar

Clone this repo:
  1. eab7815 Update NuGet packages and make ready for 0.9.5 by Daniel Blankensteiner · 2 weeks ago master 0.9.5
  2. ad86003 Update AsyncQueue.cs (#54) by Pavel Krupets · 2 weeks ago
  3. 7b1eaf6 Eat errors in SetupChannel (#52) by lee_chrisbell · 2 weeks ago
  4. ac1e228 Update test method names to follow Feature/MethodName_Given[StateUnderTest]_Should[ExpectedBehavior] by Daniel Blankensteiner · 2 weeks ago
  5. 1f4e498 Fix checking MessageId against null throwing NRE (#50) by Tim Corbett · 2 weeks ago

# DotPulsar

CI - Unit

.NET/C# client library for Apache Pulsar.

DotPulsar is written entirely in C# and implements Apache Pulsar's binary protocol. Other options was using the C++ client library (which is what the Python client and Go client do) or build on top of the WebSocket API. We decided to implement the binary protocol to gain full control and maximize portability and performance.

DotPulsar‘s API is strongly inspired by Apache Pulsar’s official Java client, but a 100% match is not a goal.

Getting Started

Let's take a look at a “Hello world” example, where we first produce a message and then consume it.

Install the NuGet package DotPulsar and copy/paste the code below (you will be needing using declarations for ‘DotPulsar’ and ‘DotPulsar.Extensions’).

const string myTopic = "persistent://public/default/mytopic";

await using var client = PulsarClient.Builder()
                                     .Build(); //Connecting to pulsar://localhost:6650

var producer = client.NewProducer()

_ = await producer.Send(Encoding.UTF8.GetBytes("Hello World"));

var consumer = client.NewConsumer()

await foreach (var message in consumer.Messages())
    Console.WriteLine("Received: " + Encoding.UTF8.GetString(message.Data.ToArray()));
    await consumer.Acknowledge(message);

For a more in-depth tour of the API, please visit the Wiki.

Supported features

  • [X] Service discovery
  • [X] Automatic reconnect
  • [X] TLS connections
  • [X] TLS Authentication
  • [X] JSON Web Token Authentication
  • [X] Producer send with custom metadata
  • [X] Producer send with event time, sequence id and delayed message delivery
  • [X] Producer send with key and ordering key
  • [X] Consumer subscription with initial position and priority level
  • [X] Consumer subscription types exclusive, shared, failover and key shared
  • [X] Consumer receive and single + cumulative acknowledge
  • [X] Consumer seek
  • [X] Consumer unsubscribe
  • [X] Consume compacted topics
  • [X] Reader API
  • [X] Read/Consume/Acknowledge batched messages
  • [X] Pulsar Proxy


Help prioritizing the roadmap is most welcome, so please reach out and tell us what you want and need.


We are feature complete for this release. We just need testing.

  • [X] Use IAsyncDisposable
  • [X] Use IAsyncEnumerable
  • [X] Use ValueTask instead of Task
  • [X] Make solution nullable
  • [X] Support .NET Standard 2.0 and 2.1

If requested by the community

Let us know which features you need by creating an issue or by giving existing issues a “Thumbs up”.

Join Our Community

Apache Pulsar has a Slack instance and there you'll find us in the #dev-dotpulsar channel. Just waiting for you to pop by :-)

Built With

  • protobuf-net - Provides simple access to fast and efficient “Protocol Buffers” serialization from .NET applications
  • System.IO.Pipelines - Single producer single consumer byte buffer management


We use SemVer for versioning. For the versions available, see the tags on this repository.


See also the list of contributors who participated in this project.


This project is licensed under the Apache License Version 2.0 - see the LICENSE file for details.