在 Asp.Net 核心应用程序中,无法从 json 文件中读取连接字符串?

in an Asp.Net core application, Unable to read the connection string from the json file?

https://docs.microsoft.com/en-us/ef/core/miscellaneous/connection-strings?

我按照此站点将连接字符串放入 json 文件中,但是当我尝试访问数据库时说我想获取所有酒店的列表,但出现异常 "Value cannot be null"

public Startup(IHostingEnvironment env)
{
    var builder = new ConfigurationBuilder()
        .SetBasePath(env.ContentRootPath)
        .AddJsonFile("ConnectionServerJson.json")
        .AddEnvironmentVariables();

    configuration = builder.Build();
}

public IConfiguration configuration { get; set; }

public void ConfigureServices(IServiceCollection services)
{

    services.AddDbContext<DBRezervareHotelieraContext>(options =>
            options.UseSqlServer(configuration.GetConnectionString("DefaultConnection")));
    services.AddScoped<DbContext>(sp => sp.GetService<DBRezervareHotelieraContext>());
    var container = services.BuildServiceProvider();

    services.AddMvc();
}

这是 connectionStringJson.json 文件

{
  "connectionString": {
    "DefaultConnection": "Server=DESKTOP-TPPITPA\SQLEXPRESS;Database=DBRezervareHoteliera;Trusted_Connection=True;"
  }
}

我也确实从上下文中取出class DBRezervareHotelieraContext onConfigure 方法并放入以下内容 public

DBRezervareHotelieraContext(DbContextOptions<DBRezervareHotelieraContext> options) : base(options)
{

}

我认为这无关紧要,但可能会有帮助

您需要在配置文件中 "ConnectionString" 的末尾添加一个 "s":ConnectionStrings 并将案例命名为 PascalCase。