Message：Value cannot be null. (Parameter 'source')

StackTrace： at System.Linq.ThrowHelper.ThrowArgumentNullException(ExceptionArgument argument) at System.Linq.Enumerable.Take[TSource](IEnumerable`1 source, Int32 count) at BuildingMaterialSolution.Controllers.JycnController.Wishlist() in E:\VS\国网项目\纳贝斯\建材平台\BuildingMaterialSolution\BuildingMaterialSolution\Controllers\JycnController.cs:line 311