如何創建具有正確總計和分組的對象

Question

我試圖創建一個對象，需要按BatchCode進行分組，並在某些字段上進行彙總。我正在嘗試使用Groupby函數來完成此操作，但是我遇到了困難，我將不勝感激。

輸入記錄：
記錄1：

BatchCode 1234 
BatchType Scanned 
Amount 10.00 
RecType Adc 

記錄2：

BatchCode 1234 
BatchType Scanned 
Amount 5.00 
RecType NotAdc 

記錄3：

BatchCode 2222 
BatchType NonScanned 
Amount 25.00 
RecType Adc 

記錄4：

BatchCode 2222 
BatchType NonScanned 
Amount 30.01 
RecType NotAdc 

預期的輸出對象：

"Batches": [ 
    { 
     "BatchCode": "1234", 
     "BatchType": "Scanned", 
     "DetailRecordCountAdc": 1, 
     "DetailRecordCountNotAdc": 1, 
     "DetailRecordCountTotal": 2, 
     "AmountAdc": 10.00, 
     "AmountNotAdc": 5.00, 
     "AmountTotal": 15.00 
    }, 
    { 
     "BatchCode": "2222", 
     "BatchType": "Nonscanned", 
     "DetailRecordCountAdc": 1, 
     "DetailRecordCountNotAdc": 1, 
     "DetailRecordCountTotal": 2, 
     "AmountAdc": 25.00, 
     "AmountNotAdc": 30.01, 
     "AmountTotal": 55.01 
    } 
    ]   

Answer 1

要做到這一點，我徑自並提出了一些假設。我的主要假設是你的實體如何設置。

這是我如何設置它們：

public enum BatchType 
{ 
    Scanned = 1, 
    NonScanned = 2 
} 

public enum RecType 
{ 
    Adc = 1, 
    NotAdc = 2 
} 

public class Batch 
{ 
    public int BatchCode { get; set; } 
    public BatchType BatchType { get; set; } 
    public double Amount { get; set; } 
    public RecType RecType { get; set; } 
} 

public class BatchGroup 
{ 
    public int BatchCode { get; set; } 
    public BatchType BatchType { get; set; } 
    public int DetailRecordCountAdc { get; set; } 
    public int DetailRecordCountNotAdc { get; set; } 
    public int DetailRecordCountTotal => DetailRecordCountAdc + DetailRecordCountNotAdc; 
    public double AmountAdc { get; set; } 
    public double AmountNotAdc { get; set; } 
    public double AmountTotal => AmountAdc + AmountNotAdc; 
} 

有一次，我的類和這樣的地方，我創建的每一個正確的值對象：

var list = new[] 
{ 
    new Batch 
    { 
     BatchCode = 1234, 
     BatchType = BatchType.Scanned, 
     Amount = 10.00, 
     RecType = RecType.Adc 
    }, 
    new Batch 
    { 
     BatchCode = 1234, 
     BatchType = BatchType.Scanned, 
     Amount = 5.00, 
     RecType = RecType.NotAdc, 
    }, 
    new Batch 
    { 
     BatchCode = 2222, 
     BatchType = BatchType.NonScanned, 
     Amount = 25.00, 
     RecType = RecType.Adc, 
    }, 
    new Batch 
    { 
     BatchCode = 2222, 
     BatchType = BatchType.NonScanned, 
     Amount = 30.01, 
     RecType = RecType.NotAdc, 
    } 
}; 

一切就緒我做了LINQ聲明。

var result = list.GroupBy(x => new { x.BatchCode, x.BatchType }).Select(x => new BatchGroup 
{ 
    BatchCode = x.Key.BatchCode, 
    BatchType = x.Key.BatchType, 
    DetailRecordCountAdc = x.Count(y => y.RecType == RecType.Adc), 
    DetailRecordCountNotAdc = x.Count(y => y.RecType == RecType.NotAdc), 
    AmountAdc = x.Where(y => y.RecType == RecType.Adc).Sum(y => y.Amount), 
    AmountNotAdc = x.Where(y => y.RecType == RecType.NotAdc).Sum(y => y.Amount) 
});