我试图从appSettings.json文件中获取连接字符串，但我不能。
我的启动是这样的：
namespace YangSoft_WebAPI
{
public class Startup
{
public IConfiguration Configuration { get; }
public Startup(IHostingEnvironment env)
{
var builder = new ConfigurationBuilder()
.SetBasePath(env.ContentRootPath)
.AddJsonFile("appsettings.json", optional:false, reloadOnChange:true)
.AddJsonFile($"appsettings.{env.EnvironmentName}.json", optional:true)
.AddEnvironmentVariables();
Configuration = builder.Build();
var enviroment = Configuration["ApplicationSettings:Enviroment"];
}
readonly string AllowControlOrigins = "Access-Control-Allow-Origin";
// This method gets called by the runtime. Use this method to add services to the container.
public void ConfigureServices(IServiceCollection services)
{
services.Configure<AppSettingsDAL>(Configuration.GetSection("ApplicationSettings"));
services.AddDbContextPool<yangsoftDBContext>(options =>
options.UseSqlServer(Configuration.GetConnectionString("local")));
services.AddCors(options =>
{
options.AddDefaultPolicy(
builder =>
{
builder.WithOrigins("*"); …