Using Microsoft.Azure.Management.Fluent to swap App Service staging and production slots - used with AVACloud, see https://blog.dangl.me/archive/deploy-to-azure-app-service-with-no-downtime-by-using-staging-slots/

Swap.cs

if (PublishEnvironmentName == "Production")
{
    var azureCredentials = SdkContext.AzureCredentialsFactory
        .FromServicePrincipal(AzureServicePrincipalClientId,
             AzureServicePrincipalClientSecret,
             AzureServicePrincipalTenantId,
             AzureEnvironment.AzureGlobalCloud);
    IAzure azure = Azure.Configure()
        .WithLogLevel(HttpLoggingDelegatingHandler.Level.Basic)
        .Authenticate(azureCredentials)
        .WithDefaultSubscription();
    var webApp = (await azure.AppServices.WebApps
        .ListAsync())
        .First(app => app.Name == AzureAppServiceName);
    var slot = (await webApp.DeploymentSlots.ListAsync())
        .First(s => s.Name == AzureAppServiceStagingSlotName);

    var statusUrl = $"https://{slot.DefaultHostName}/status";
    if (!(bool)JObject.Parse(await HttpDownloadStringAsync(statusUrl))["isHealthy"])
    {
        ControlFlow.Fail("The web app in the staging slot does not report a healthy status");
    }

    // "production" is the default name for the main slot
    await slot.SwapAsync("production");
}