.NET Core The configuration file 'appsettings.json' was not found and is not optional

错误代码

public Startup()

{

var builder = new ConfigurationBuilder().AddJsonFile("AppSetting.json");

Configuration = builder.Build();

}

 

修改

 

public Startup(IHostingEnvironment environment)

{

var builder = new ConfigurationBuilder().SetBasePath(environment.ContentRootPath).AddJsonFile("AppSetting.json");

Configuration = builder.Build();

}

 

或

 

 

public Startup()
{
var buiider = new ConfigurationBuilder().SetBasePath(Directory.GetCurrentDirectory()).AddJsonFile("AppSettings.json");
Configuration = buiider.Build();
}