ServiceStack：视图中未使用的自定义应用程序设置

Question

我与 ServiceStack 相处得很好，但遇到了一个我目前无法解决的问题。在我的 Global.asax.cs Configure() 方法中，我声明了一个基于数据库的 AppSettings，如下所示：

            // Create app settings, based on dictionary settings from central database
            Dictionary<string, string> configSettings = null;
            using (var db = container.Resolve<IDbConnectionFactory>().Open())
            {
                configSettings = db.Dictionary<string, string>(db.From<ConfigSetting>());
            }
            var dicSettings = new DictionarySettings(configSettings);

            // Register app settings for injection
            container.Register<IAppSettings>(dicSettings);

这在注入 AppSettings 的代码中效果很好：

public class RemoteEmailValidator : IEmailValidator
{
    public IAppSettings AppSettings { get; set; }

    public bool ValidEmail(string email)
    {
        try
        {
            if (String.IsNullOrEmpty(email) || email.Length > 256)
            {
                return false;
            }

            RestClient client = new RestClient();
            string baseURL = AppSettings.Get("MailgunAPIBaseURL", "");
            if (String.IsNullOrEmpty(baseURL))
            {
                // If we can't check email in-depth, then it's OK
                return true;
            }
            else
            {
                client.BaseUrl = new Uri(baseURL);
                client.Authenticator =
                        new HttpBasicAuthenticator(AppSettings.Get("MailgunAPIUserName", ""),
                                                   AppSettings.Get("MailgunAPIPublicKey", ""));
                RestRequest request = new RestRequest();
                request.Resource = AppSettings.Get("MailgunAPIEmailValidationResource", "");
                request.AddParameter("address", email);

                var response = client.Execute(request);
                dynamic content = DynamicJson.Deserialize(response.Content);

                return content.is_valid == "true";
            }
        }
        catch { } // Suppress any errors, because email validation is nice to have

        return true;
    }
}

如您所料，这些值是从数据库中检索出来的。但是，当我尝试从视图访问 AppSettings 时，会从 web.config 返回值。例如。在我的 register.cshtml 中：

string maxHouseholdMembers = HostContext.AppSettings.Get("MaxMembersPerHousehold", "20");

该值不会因数据库中的值而异，而是会因更新 web.config 而异。那么，我是否需要做任何额外的配置，才能让我的视图使用我在 global.asax.cs Configure() 方法中创建的自定义 AppSettings？

Answer 1

在我实际发布问题时找到了答案。只需要在 Configure() 方法中多加一行：

            // Create app settings, based on dictionary settings from central database
            Dictionary<string, string> configSettings = null;
            using (var db = container.Resolve<IDbConnectionFactory>().Open())
            {
                configSettings = db.Dictionary<string, string>(db.From<ConfigSetting>());
            }
            var dicSettings = new DictionarySettings(configSettings);
            AppSettings = dicSettings;

最后一行 (AppSettings = dicSettings) 可以解决问题并覆盖标准 AppSettings。