LaunchDarkly -如何添加到IConfiguration - .NET 5.0

Question

我已经使用FeatureFlagService类和依赖注入将LaucnhDarkly集成到我的.NET 5代码中，如下所示。

services.AddSingleton<IFeatureFlagsService>(sp => new FeatureFlagsService(configuration));

而在FeatureFlagsService.cs中，

public class FeatureFlagsService : IFeatureFlagsService
{
    private readonly LdClient _ldClient;

    public FeatureFlagsService(IConfiguration configuration)
    {
        _ldClient = new LdClient(configuration["LaunchDarkly:Key"]);
    }

    public T GetFeatureFlag<T>(string flagKey, string userKey = "anonymous")
    {
        var user = User.WithKey(userKey);

        if (typeof(T).Equals(typeof(bool)))
            return (T)(object)_ldClient.BoolVariation(flagKey, user, default);
        else if (typeof(T).Equals(typeof(int)))
            return (T)(object)_ldClient.IntVariation(flagKey, user, default);
        else if (typeof(T).Equals(typeof(float)))
            return (T)(object)_ldClient.FloatVariation(flagKey, user, default);
        else if (typeof(T).Equals(typeof(string)))
            return (T)(object)_ldClient.StringVariation(flagKey, user, default);

        return default;
    }
}

在任何控制器中，我都是通过构造函数注入IFeatureFlagsService的，用法如下

_featureFlagService.GetFeatureFlag<bool>("externalUsersAllowed");

现在，我想取出这个featureflagservice.cs并将该LaunchDarkly添加到现有的IConfiguration中，并使用如下所示

_configuation.GetValue<bool>("externalUsersAllowed")

我如何才能做到这一点？您的帮助将不胜感激。

Answer 1

您需要通过实现IConfigurationSource来实现自定义配置提供程序，以便能够通过configuration对象、IOptions等访问它们

本文提供了如何做到这一点的示例：https://docs.microsoft.com/en-us/dotnet/core/extensions/custom-configuration-provider