不可用的OkObjectResult不能像方法一样使用

Question

我试图将基于视图的应用程序更改为API。 关闭此项目here。我不能退还OkObjectResult。为什么会这样呢，为什么ASP的价格是IActionResult vs ActionResult？

[HttpGet] 
public IActionResult Index() 
{ 
    List<ApplicationRoleListViewModel> model = new List<ApplicationRoleListViewModel>(); 
    model = roleManager.Roles.Select(r => new ApplicationRoleListViewModel 
    { 
     RoleName = r.Name, 
     Id = r.Id, 
     Description = r.Description, 
     NumberOfUsers = r.Users.Count 
    }).ToList(); 
    return OkObjectResult(model); 
} 

Answer 1

OkObjectResult是一类不是一个方法，你需要新的它：return new OkObjectResult(model)或使用helper method that exists on the controller：

return Ok(model);