Azure 启动时的功能管理

Question

我想使用 Azure 功能管理来驱动是否在启动期间将服务添加到依赖.ConfigureServices(hostcontext, services =>

我能找到的唯一方法是调用 BuildServiceProvider 来获取 IFeatureManagement。

var featureManager = services.BuildServiceProvider().GetRequiredService<IFeatureManager>();
if (featureManager.IsEnabledAsync(Features.MY_FEATURE).GetAwaiter().GetResult())
{
    services.AddFeatureDependencies();
}

必须有更好的方法来做到这一点。 我在某处缺少服务扩展吗？ 像下面这样的东西？

services.IfFeatureEnabled(Features.MY_FEATURE) {
    services.AddFeatureDependencies();
}

或者也许通过使用可以获取其他配置值的 IConfiguration 接口？

hostContext.Configuration.GetValue<bool>($"FeatureManager:{FeatureManagement.MY_FEATURE}");

Answer 1

我发现为此创建扩展方法很有用：

public static class ConfigurationExtensions
{
    public static bool IsFeatureEnabled(this IConfiguration configuration, string feature)
    {
        var featureServices = new ServiceCollection();
        featureServices.AddFeatureManagement(configuration);
        using var provider = featureServices.BuildServiceProvider();
        var manager = provider.GetRequiredService<IFeatureManager>();

        return manager.IsEnabledAsync(feature).GetAwaiter().GetResult();
    }
}