Question

我想对数据进行分组和排序，但是OrderBy函数无法正常工作，我想知道自己做错了什么

代码：

var data = new List<PreparedData>() {
  new PreparedData {
    IsGroup = false,
    Service = "Number 5",
    Name = "Banana",
    SomeValue = 5,
  },
  new PreparedData {
    IsGroup = false,
    Service = "Number 5",
    Name = "Apple",
    SomeValue = 5,
  },
  new PreparedData {
    IsGroup = false,
    Service = "Number 3",
    Name = "Apple",
    SomeValue = 5,
  },
  new PreparedData {
    IsGroup = false,
    Service = "Number 3",
    Name = "Blueberry",
    SomeValue = 9,
  },
  new PreparedData {
    IsGroup = true,
    Service = "Number 9",
    Name = "Garlic",
    SomeValue = 7,
  }
}


var groupedAndSortedData = data.GroupBy(x => x.IsGroup).Select(isGroup => new FruitViewData 
  {
    IsGroup = isGroup.Key,
    FruitData = isGroup.GroupBy(s => s.Service).Select(service => new FruitServiceData 
    {
      Service = service.OrderBy(z => z.Service).First().Service,
      FruitTypeData = service.OrderBy(x => x.Name).Select(fruitType => new FruitTypeData 
      {
        Name = fruitType.Name,
        SomeValue = fruitType.SomeValue
      }  
    }
  }

最后我得到：

[
  {
    IsGroup: false
    FruitData: [
      {
        Service: "Number 5",
        FruitTypeData: [
          {
            Name: "Banana",
            SomeValue = 5,
          },
          { 
            Name: "Apple",
            SomeValue = 5,
          },
        ] 
      },
      {
        Service: "Number 3",
        FruitTypeData: [
          {
            Name: "Apple",
            SomeValue = 5,
          },
          { 
            Name: "Blueberry",
            SomeValue = 9,
          },
        ] 
    ]
  },
  {
    IsGroup: true
    FruitData: [
      {
        Service: "Number 9",
        FruitTypeData: [
          {
            Name: "Garlic",
            SomeValue = 9,
          }
        ] 
      },
    ]
  },
]

但是我想获得排序的数据，例如：

[
  {
    IsGroup: false
    FruitData: [
      {
        Service: "Number 3",
        FruitTypeData: [
          {
            Name: "Apple",
            SomeValue = 5,
          },
          { 
            Name: "Blueberry",
            SomeValue = 9,
          },
        ]
      },
      {
        Service: "Number 5",
        FruitTypeData: [
          {
            Name: "Apple",
            SomeValue = 5,
          },
          { 
            Name: "Banana",
            SomeValue = 5,
          },
        ] 
      }, 
    ]
  },
  {
    IsGroup: true
    FruitData: [
      {
        Service: "Number 9",
        FruitTypeData: [
          {
            Name: "Garlic",
            SomeValue = 9,
          }
        ] 
      },
    ]
  },
]

我试图以不同的方式对它进行排序，例如在groupedAndSortedData之后使用foreach循环，并在每次迭代中添加OrderBy函数，但效果也不令人满意

我应该改变以获得预期的结果？

Answer 1

在我看来，您需要订购FruitData结果：

var groupedAndSortedData = data.GroupBy(x => x.IsGroup).Select(isGroup => new FruitViewData
{
    IsGroup = isGroup.Key,
    FruitData = isGroup.GroupBy(s => s.Service).Select(service => new FruitServiceData
    {
        Service = service.OrderBy(z => z.Service).First().Service,
        FruitTypeData = service.OrderBy(x => x.Name).Select(fruitType => new FruitTypeData
        {
            Name = fruitType.Name,
            SomeValue = fruitType.SomeValue
        })
    }).OrderBy(fd => fd.Service) //This here
});

注意.OrderBy(fd => fd.Service)方法调用。

为什么OrderBy不对数据排序？

1 个答案: