Question

我试图从sortedItems中获取项目，然后创建一个GroupBy MaterialCode和MaterialThickness。然后，我想找到MaterialCode和MaterialThickness相同的NbrOfSheets的总和。

这是我的代码。

var sortedItems =
db.Jobs
.Where(x => x.JobStatus == "O")
.OrderBy(x => x.Material.MaterialCode).ThenBy(x => x.MaterialThickness)
.ThenBy(x => x.IdealSheetSize).ThenByDescending(x => x.DueDate)
.Select(x => new
{
    x.JobNum,
    x.Material.MaterialCode,
    x.MaterialThickness,
    x.Part.CustPartNum,
    x.Part.CustName,
    x.IdealSheetSize,
    x.NbrOfSheets,
    x.DueDate,
    x.ShipmentNotes,
    JobRoutings = x.JobRoutings.Select(e => new
    {
        e.ProcessID,
        e.CrewSize,
        e.PiecesPerHour,
        e.OnHand,
        e.PC,
        e.LastScannedDate,
        e.OpSeq
    })
}).AsNoTracking().ToList();

Answer 1

按具有这些属性的匿名类型分组，然后在分组上使用Sum：

var result = sortedItems    
   .GroupBy(x => new { x.MaterialCode, x.MaterialThickness })
   .Select(g => new { 
       g.Key.MaterialCode, g.Key.MaterialThickness,
       NbrOfSheetsSum = g.Sum(x => x.NbrOfSheets)
    });

Answer 2

我使用类对您的数据库建模，以使语法正确。请参阅下面的答案：

    class Program
    {
        static void Main(string[] args)
        {
            DataBase db = new DataBase();

            var sortedItems =
                db.Jobs
                .Where(x => x.JobStatus == "O")
                .OrderBy(x => x.Material.MaterialCode).ThenBy(x => x.MaterialThickness).ThenBy(x => x.IdealSheetSize).ThenByDescending(x => x.DueDate)
                .Select(x => new
                {
                    x.JobNum,
                    x.Material.MaterialCode,
                    x.MaterialThickness,
                    x.Part.CustPartNum,
                    x.Part.CustName,
                    x.IdealSheetSize,
                    x.NbrOfSheets,
                    x.DueDate,
                    x.ShipmentNotes,
                    JobRoutings = x.JobRoutings.Select(e => new
                    {
                        e.ProcessID,
                        e.CrewSize,
                        e.PiecesPerHour,
                        e.OnHand,
                        e.PC,
                        e.LastScannedDate,
                        e.OpSeq
                    })
                }).ToList();

            var groups = sortedItems.GroupBy(x => new { materialCode = x.MaterialCode, materialThickness = x.MaterialThickness })
                .Select(x => new { job = x, count = x.Sum(y => y.NbrOfSheets) }).ToList();


        }
    }
    public class DataBase
    {
        public List<Job> Jobs { get; set; } 
    }
    public class Job
    {
        public string JobStatus { get; set; }
        public Material Material { get; set; }
        public string MaterialThickness { get; set; }
        public string IdealSheetSize { get; set; }
        public DateTime DueDate { get; set; }
        public int JobNum { get; set; }
        public Part Part { get; set; }
        public int NbrOfSheets { get; set; }
        public string ShipmentNotes { get; set; }
        public List<JobRoutings> JobRoutings { get; set; }
    }
    public class Material
    {
        public string MaterialCode { get; set; }
    }
    public class Part
    {
        public string CustPartNum { get; set; }
        public string CustName { get; set; }
    }
    public class JobRoutings
    {
        public string ProcessID {get;set;}
        public string CrewSize {get;set;}
        public string PiecesPerHour {get;set;}
        public string OnHand {get;set;}
        public string PC {get;set;}
        public string LastScannedDate {get;set;}
        public string OpSeq { get; set; }
    }

GroupBy，然后求和

2 个答案: