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LaunchDarkly Server-Side SDK for .NET

The LaunchDarkly Server-Side SDK for .NET is designed primarily for use in multi-user systems such as web servers and applications. It follows the server-side LaunchDarkly model for multi-user contexts. It is not intended for use in desktop and embedded systems applications.

For using LaunchDarkly in client-side .NET applications, including mobile applications and desktop applications, refer to our .NET Client SDK.

Packages

SDK Packages NuGet API Docs Issues Tests
LaunchDarkly.ServerSdk NuGet Documentation Server SDK Actions Status
Telemetry Packages NuGet API Docs Issues Tests
LaunchDarkly.ServerSdk.Telemetry NuGet Documentation Telemetry Actions Status

Organization

Directory Purpose
pkgs Top level directory containing package implementations.
pkgs/sdk SDK packages intended for use by application developers. Currently contains only the .NET Server-Side SDK.
pkgs/telemetry Packages for adding telemetry support to SDKs.

LaunchDarkly overview

LaunchDarkly is a feature management platform that serves trillions of feature flags daily to help teams build better software, faster. Get started using LaunchDarkly today!

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Supported .NET versions

This version of the SDK is built for the following targets:

  • .NET 6.0: runs on .NET 6.0 and above (including higher major versions).
  • .NET Framework 4.6.2: runs on .NET Framework 4.6.2 and above.
  • .NET Standard 2.0: runs in any project that is targeted to .NET Standard 2.x rather than to a specific runtime platform.

The .NET build tools should automatically load the most appropriate build of the SDK for whatever platform your application or library is targeted to.

The only differences in the SDK between platforms are these:

  • Setting a TCP connection timeout is only supported in .NET Core and .NET 6.0+. For more details, see HttpConfigurationBuilder.ConnectTimeout.
  • The SDK requires the System.Text.Json API to be available; it is built into the standard runtime library in .NET Core and .NET 6.0+, but not on other platforms, so on other platforms the SDK brings in System.Text.Json as a NuGet package dependency.

Getting started

Refer to the SDK documentation for instructions on getting started with using the SDK.

Signing

The published version of this assembly is digitally signed with Authenticode and strong-named. Building the code locally in the default Debug configuration does not use strong-naming and does not require a key file. The public key file is in this repository at LaunchDarkly.pk as well as here:

Public Key:
0024000004800000940000000602000000240000525341310004000001000100f121bbf427e4d7
edc64131a9efeefd20978dc58c285aa6f548a4282fc6d871fbebeacc13160e88566f427497b625
56bf7ff01017b0f7c9de36869cc681b236bc0df0c85927ac8a439ecb7a6a07ae4111034e03042c
4b1569ebc6d3ed945878cca97e1592f864ba7cc81a56b8668a6d7bbe6e44c1279db088b0fdcc35
52f746b4

Public Key Token: f86add69004e6885

Learn more

Read our documentation for in-depth instructions on configuring and using LaunchDarkly. You can also head straight to the complete reference guide for this SDK.

The authoritative description of all types, properties, and methods is in the generated API documentation.

Testing

We run integration tests for all our SDKs using a centralized test harness. This approach gives us the ability to test for consistency across SDKs, as well as test networking behavior in a long-running application. These tests cover each method in the SDK, and verify that event sending, flag evaluation, stream reconnection, and other aspects of the SDK all behave correctly.

Contributing

We encourage pull requests and other contributions from the community. Check out our contributing guidelines for instructions on how to contribute to this SDK.

About LaunchDarkly

  • LaunchDarkly is a continuous delivery platform that provides feature flags as a service and allows developers to iterate quickly and safely. We allow you to easily flag your features and manage them from the LaunchDarkly dashboard. With LaunchDarkly, you can:
    • Roll out a new feature to a subset of your users (like a group of users who opt-in to a beta tester group), gathering feedback and bug reports from real-world use cases.
    • Gradually roll out a feature to an increasing percentage of users, and track the effect that the feature has on key metrics (for instance, how likely is a user to complete a purchase if they have feature A versus feature B?).
    • Turn off a feature that you realize is causing performance problems in production, without needing to re-deploy, or even restart the application with a changed configuration file.
    • Grant access to certain features based on user attributes, like payment plan (eg: users on the ‘gold’ plan get access to more features than users in the ‘silver’ plan). Disable parts of your application to facilitate maintenance, without taking everything offline.
  • LaunchDarkly provides feature flag SDKs for a wide variety of languages and technologies. Read our documentation for a complete list.
  • Explore LaunchDarkly