配置 ASP.NET 核心应用程序的"prod"和"dev"

Question

我尝试为我的 ASP.NET Core 2.0应用程序设置"dev"和"prod"环境，但它不起作用...这是我的配置：

appsettings.json内容（与appsettings.Development.json完全相同）

{
  "Logging": {
    "IncludeScopes": false,
    "LogLevel": { "Default": "Warning" }
  },
  "ConnectionStrings": {
    "MyAppContext":     
      "...AccountName=MyApptables4dev; AccountKey=xxxxxx==;EndpointSuffix=core.windows.net"
  },
  "Authentication": {
    "AzureAd": {
      "AADInstance": "https://login.microsoftonline.com/",
      "CallbackPath": "/signin-oidc",
      "ClientId": "xxxxxxx",
      "Domain": "MyAppapp-dev.azurewebsites.net",
      "TenantId": "yyyyyyy"
    }
  }
}

对于appsettings.Production.json，只有连接字符串和域名更改：

"MyAppContext":"...AccountName=MyApptables4dev;AccountKey=yyyyyy==;EndpointSuffix=core..."

和

"Domain": "MyAppapp.azurewebsites.net",

Startup.cs ：

public Startup(IHostingEnvironment env)
{
    var builder = new ConfigurationBuilder()
        .SetBasePath(env.ContentRootPath)
        .AddJsonFile("appsettings.json", optional: true, reloadOnChange: true)
        .AddJsonFile($"appsettings.{env.EnvironmentName}.json", optional: true, reloadOnChange: true);
    if (env.IsDevelopment())
    {
        builder = builder.AddUserSecrets<Startup>();
    }
    builder.AddEnvironmentVariables();
    Configuration = builder.Build();
}
public void ConfigureServices(IServiceCollection services)
{
    // Adds services required for using options.
    services.AddOptions();
    // Register the IConfiguration instance which "ConnectionStrings" binds against.
    //services.Configure<ConnectionStrings>(Configuration.GetSection("ConnectionStrings"));
    services.Configure<AppSecrets>(Configuration);
    services.AddSingleton<ITableRepositories, TableClientOperationsService>();
    // ...

secrets.json（位于"用户"文件夹中）内容

{
  "MyAppTablesConnectionString": "DefaultEndpointsProtocol=https;AccountName=myapptables4dev;AccountKey=xxx==;EndpointSuffix=core.windows.net"
}

最后是访问数据库的类（在我的例子中是AzureTables）

public class TableClientOperationsService : ITableRepositories
{
    // ... 
    public TableClientOperationsService() { }
    public TableClientOperationsService(IOptions<AppSecrets> optionsAccessor)
    {
        tables = new Dictionary<string, CloudTable>();            
        // 'null' in 'prod'!
        connectionString = optionsAccessor.Value.MyAppTablesConnectionString; 
    }

知道MyAppTablesConnectionString在"生产"中是"null"，也许问题来自那里，但我不知道如何让它同时适用于MyAppContext和MyAppTablesConnectionString连接字符串......

Answer 1

因此，您的代码从MyAppTablesConnectionString设置中读取值：

connectionString = optionsAccessor.Value.MyAppTablesConnectionString; 

但根据提供的信息，只有dev env具有此设置（通过secret.json定义并由builder = builder.AddUserSecrets<Startup>();读取）。

所以是的，生产环境得到了null，因为该设置未在任何配置源中定义：

• 用户密钥不与 PROD 一起使用
• appsettings文件不描述MyAppTablesConnectionString
• 并且您不会通过 env 变量传递此值。