实体框架LINQ MVC API控制器

Question

I am wondering how to return a single row with the newest date but I get errors on implicit conversion

var punum = db.OrdNumbers
               .OrderByDescending(p => p.CreateDate)
               .FirstOrDefault();

        return new OrdNumberDTO() { orderNum = punum.orderNum, CreateDate = punum.CreateDate};

// Error Cannot implicitly convert type 'ProduceService.Models.OrdNumberDTO' to 'System.Collections.Generic.IEnumerable'. An explicit conversion exists (are you missing a cast?)

Answer 1

问题是您的方法期望IEnumerable，而不是单个对象，