更新后无法读取应用程序设置

Question

应用程序的工作方式：

选项1-从应用程序设置加载项目选项2-包括新项目

如果选择“选项1”，则显示项目。这行得通。所以...我使用“选项2”添加了一个新项目。这行得通。但是，如果我选择“选项1”以显示itens，则列表为空。

我的设置

  "app": {
    "hosts": [
      {
        "ip": "127.0.0.1",
        "hostname": "NotFound"
      },
      {
        "ip": "127.0.0.1",
        "hostname": "MyProject"
      },
      {
        "ip": "127.0.0.1",
        "hostname": "AnotherProject.dev"
      }
    ]
  }
}

进行绑定

AppSettingsModel appSettings = new AppSettingsModel();
Configuration.Bind("app", appSettings);

我将appsettings配置为reloadOnChange

static IConfiguration LoadConfiguration() => 
            new ConfigurationBuilder()
                .SetBasePath(Directory.GetCurrentDirectory())
                .AddJsonFile("appsettings.json", false, true)
                .Build();

更新应用设置

var appSettings = new AppSettingsModel();
                        var appSettings = new AppSettingsModel();
Configuration.Bind("app", appSettings);

appSettings.Hosts.Add(new HostsModel()
{ 
    Ip = "102.54.94.97",
    Hostname = "rhino.acme.com" 
});

var jsonSerializerOptions = new JsonSerializerOptions()
{
    PropertyNamingPolicy = JsonNamingPolicy.CamelCase
};

var resultC = JsonSerializer.Serialize(appSettings, jsonSerializerOptions);

File.WriteAllText("appsettings.json", resultC);

我的代码-> https://github.com/tiago-aguiar-moreira/ManagerHosts

Answer 1

步骤：

• 确认是否有以下nuget包

  Microsoft.Extensions.Configuration
  Microsoft.Extensions.Configuration.FileExtensions
  Microsoft.Extensions.Configuration.Json
  

• 您需要手动创建和添加appsettings.json（如果不存在）并将copy it to output directory设置为copy if newer

---

AppSetting.json

   {
  "ConnectionStrings": {
    "BloggingDatabase": "Server=(localdb)\\mssqllocaldb;Database=EFGetStarted.ConsoleApp.NewDb;Trusted_Connection=True;"
  },
}

Program.cs（访问AppSettings的ConnectionStrings）>

static void Main(string[] args)
{
    var builder = new ConfigurationBuilder()
        .SetBasePath(Directory.GetCurrentDirectory())
        .AddJsonFile("appsettings.json", optional: false, reloadOnChange: true);

    IConfigurationRoot configuration = builder.Build();

    Console.WriteLine(configuration.GetConnectionString("BloggingDatabase"));
}