Question

我有以下课程：

public class File
{     public string FileId; 
      public <Batch> Batches;
      public decimal Amount; 
}

public class Batch
{     public string FileId; 
      public string BatchCode;
      public decimal Amount; 
}

我想创建以下输出对象：

public class SummaryFile
{
   public List<File> Files;
}

现在我有以下Batch类列表：

List<Batch> batches;

现在这个列表如下所示：

batches[0] = new Batch{ FileId = 1, BatchCode = "A", Amount = 5 }; 
batches[1] = new Batch{ FileId = 1, BatchCode = "B", Amount = 10 }; 
batches[2] = new Batch{ FileId = 2, BatchCode = "C", Amount = 22 };

我的输出对象如下：

    public class SummaryFile
    {
       public List<File> Files;
    }

我希望我的输出看起来如下：

    "Files": [
   {
      "FileId": "1",
      "Batches": [
    {
      "BatchCode": "A",
      "Amount": 5
    },
    {
      "BatchCode": "B",
      "Amount": 10
    }, 
  ],             
  "FileAmount": 15,
  },
 {
      "FileId": "2",
      "Batches": [
    {
      "BatchCode": "C",
      "Amount": 22
    },
 ],             
  "FileAmount": 22
 }
 ]

是否有可能使用Linq实现这一目标，如果不是最好的方法是什么？来自大型机，我将使用控制中断处理来完成此任务。谢谢你的帮助。

Answer 1

var summaryFile = new SummaryFile
{
    Files = batches.GroupBy(p => p.FileId)
                   .Select(p => new File
                   {
                       FileId = p.Key,
                       Batches = p.ToList(),
                       Amount = p.Sum(x => x.Amount)
                   }).ToList()
};

使用Linq创建具有Collection类型属性的对象集合

1 个答案: