Powerful feature flagging and A/B testing for C# apps using GrowthBook

• growthbook-c-sharp
  • Table of contents
  • Usage examples
    • Basic
    • Loading feature definitions from an API
      • Generic getters

This library is based on the GrowthBook SDK specs and should be compatible with the usage examples in the GrowthBook docs.

Down below you'll find two basic examples on how the package works.

1. Install GrowthBook

   dotnet add package growthbook-c-sharp

2. Declare features

   var staticFeatures = new Dictionary<string, Feature>
       {
           {"firstFeature", new Feature{ DefaultValue = true}},
           {"secondFeature", new Feature{ DefaultValue = false}}
       };

3. Create a context and add the features

   var context = new Context
   {
       Enabled = true,
       Url = "",
       Features = staticFeatures
   };

4. Create the GrowthBook object with the context

   using GrowthBook;
   //...
   
   var GrowthBook = new GrowthBook.GrowthBook(context);

5. Check whether a feature is enabled

   GrowthBook.IsOn("firstFeature") // true
   GrowthBook.IsOn("secondFeature") // false

Because feature definitions are typically loaded from API calls or cache, Json.NET objects are used to represent arbitrary document types such as Attributes, Conditions, and Feature values.

To load your features from the GrowthBook API use the following example:

1. Create a result model for the API response

   public class FeaturesResult
   {
       public HttpStatusCode Status { get; set; }
       public IDictionary<string, Feature>? Features { get; set; }
       public DateTimeOffset? DateUpdated { get; set; }
   }

2. call the endpoint and deserialize result

    var url = "YOUR_GROWTHBOOK_URL/api/features/YOUR_API_KEY";
   var response = await client.GetAsync(url);
   
   if (response.IsSuccessStatusCode)
   {
       var content = await response.Content.ReadAsStringAsync();
       var featuresResult = JsonConvert.DeserializeObject<FeaturesResult>(content);
   }

3. Construct a context and initialize GrowthBook

   var GrowthBook = new GrowthBook.GrowthBook(
       new Context {
           Enabled = true,
           Url = "",
           Features = featuresResult.Features,
       }
   );

To make it easier to deal with Feature values, generic getter functions are provided for the following:

• Experiment:
  • GetVariations<T>()
• ExperimentResult:
  • GetValue<T>()
• Feature:
  • GetDefaultValue<T>()
• FeatureResult:
  • GetValue<T>()
• Feature Rule:
  • GetVariations<T>()
• GrowthBook:
  • GetFeatureValue<T>(string key, T fallback)