featbit-dotnet-sdk

# FeatBit .NET Server SDK Integration

Expert guidance for integrating the FeatBit .NET Server-Side SDK into .NET applications, including ASP.NET Core, console applications, and worker services.

## When to Use This Skill

Activate when users:
- Ask about .NET SDK integration or setup
- Need dependency injection configuration for ASP.NET Core
- Want to evaluate feature flags in C# code
- Ask about console applications, worker services, or background services
- Need examples of flag variations (bool, string, int, double, JSON)
- Want to implement A/B testing with custom events
- Mention offline mode or bootstrapping from JSON
- Ask about OpenFeature integration or vendor-neutral feature flagging

## Prerequisites

Before integration, obtain:
- **Environment Secret**: [How to get it](https://docs.featbit.co/sdk/faq#how-to-get-the-environment-secret)
- **SDK URLs**: [How to get them](https://docs.featbit.co/sdk/faq#how-to-get-the-sdk-urls)

## Quick Start

### Installation

```bash
dotnet add package FeatBit.ServerSdk
```

### Basic Console App Example

```csharp
using FeatBit.Sdk.Server;
using FeatBit.Sdk.Server.Model;
using FeatBit.Sdk.Server.Options;

// Setup SDK options
var options = new FbOptionsBuilder("<replace-with-your-env-secret>")
    .Event(new Uri("https://app-eval.featbit.co"))
    .Streaming(new Uri("wss://app-eval.featbit.co"))
    .Build();

// Create client instance
var client = new FbClient(options);
if (!client.Initialized)
{
    Console.WriteLine("FbClient failed to initialize. Using fallback values.");
}

// Create user
var user = FbUser.Builder("user-key-123")
    .Name("User Name")
    .Custom("role", "admin")
    .Build();

// Evaluate feature flag
var isEnabled = client.BoolVariation("game-runner", user, defaultValue: false);
Console.WriteLine($"Feature enabled: {isEnabled}");

// Close client before exit
await client.CloseAsync();
```

## ASP.NET Core Integration

### Setup with Dependency Injection

```csharp
using FeatBit.Sdk.Server.Depend