如何创建具有正确总计和分组的对象

Question

我试图创建一个对象，需要按BatchCode进行分组，并在某些字段上进行汇总。我正在尝试使用Groupby函数来完成此操作，但是我遇到了困难，我将不胜感激。

输入记录：
记录1：

BatchCode 1234 
BatchType Scanned 
Amount 10.00 
RecType Adc 

记录2：

BatchCode 1234 
BatchType Scanned 
Amount 5.00 
RecType NotAdc 

记录3：

BatchCode 2222 
BatchType NonScanned 
Amount 25.00 
RecType Adc 

记录4：

BatchCode 2222 
BatchType NonScanned 
Amount 30.01 
RecType NotAdc 

预期的输出对象：

"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

要做到这一点，我径自并提出了一些假设。我的主要假设是你的实体如何设置。

这是我如何设置它们：

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，我的类和这样的地方，我创建的每一个正确的值对象：

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, 
    } 
}; 

一切就绪我做了LINQ声明。

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) 
});