Question

我尝试创建一个需要按BatchCode分组并在某些字段上合计的对象。我尝试使用Groupby功能完成此操作，但我遇到了困难，任何帮助都会受到赞赏。

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

为了实现这一目标，我继续做了一些假设。我主要假设您的实体是如何设置的。

以下是我如何设置它们：

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;
}

一旦我有了这样的类，我就用正确的值创建了每个对象：

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,
    }
};

随着一切就绪，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)
});

如何使用正确的总计和分组创建对象

1 个答案: