C# 使用LINQ根据条件将集合拆分为多个部分？

我想取得类似的成就。但我不知道我能以什么方式使用这个解决方案

我的实体具有这些属性

CustomerName
Date
SortOrder

我有这个实体的完整列表。我想做的是，将列表中具有连续排序顺序、相同日期和相同客户名称的所有项目分组

示例输入

  var inv = new List<Invoice>(){
    new Invoice(){ CustomerName = "Abc" ,Date = DateTime.Today, SortOrder = 0},
    new Invoice(){ CustomerName = "Abc" ,Date = DateTime.Today, SortOrder = 1},
    new Invoice(){ CustomerName = "Abc" ,Date = DateTime.Today, SortOrder = 2},
    new Invoice(){ CustomerName = "xyz" ,Date = DateTime.Today.Subtract(TimeSpan.FromDays(1)), SortOrder = 3},
    new Invoice(){ CustomerName = "xyz" ,Date = DateTime.Today.Subtract(TimeSpan.FromDays(1)), SortOrder = 4},
    new Invoice(){ CustomerName = "Abc" ,Date = DateTime.Today, SortOrder = 5},
    new Invoice(){ CustomerName = "Abc" ,Date = DateTime.Today, SortOrder = 6}
  };

  var invGrouped = new List<List<Invoice>>
   {
     new List<Invoice>
       {
         new Invoice {CustomerName = "Abc", Date = DateTime.Today, SortOrder = 0},
         new Invoice {CustomerName = "Abc", Date = DateTime.Today, SortOrder = 1},
         new Invoice {CustomerName = "Abc", Date = DateTime.Today, SortOrder = 2}
       },
     new List<Invoice>
       {
         new Invoice {CustomerName = "xyz", Date = DateTime.Today.Subtract(TimeSpan.FromDays(1)), SortOrder = 3},
         new Invoice {CustomerName = "xyz", Date = DateTime.Today.Subtract(TimeSpan.FromDays(1)), SortOrder = 4}
       },
     new List<Invoice>
       {
         new Invoice {CustomerName = "Abc", Date = DateTime.Today, SortOrder = 5},
         new Invoice {CustomerName = "Abc", Date = DateTime.Today, SortOrder = 6}

       }
   };

var inv=新列表（）{
新发票（）{CustomerName=“Abc”，日期=日期时间。今天，排序器=0}，
新发票（）{CustomerName=“Abc”，日期=日期时间。今天，排序器=1}，
新发票（）{CustomerName=“Abc”，日期=日期时间。今天，排序器=2}，
新发票（）{CustomerName=“xyz”，日期=日期时间。今天。减去（TimeSpan.FromDays（1）），排序规则=3}，
新发票（）{CustomerName=“xyz”，日期=日期时间。今天。减去（TimeSpan.FromDays（1）），排序器=4}，
新发票（）{CustomerName=“Abc”，日期=日期时间。今天，排序器=5}，
新发票（）{CustomerName=“Abc”，日期=日期时间。今天，排序器=6}
};

示例输出

  var inv = new List<Invoice>(){
    new Invoice(){ CustomerName = "Abc" ,Date = DateTime.Today, SortOrder = 0},
    new Invoice(){ CustomerName = "Abc" ,Date = DateTime.Today, SortOrder = 1},
    new Invoice(){ CustomerName = "Abc" ,Date = DateTime.Today, SortOrder = 2},
    new Invoice(){ CustomerName = "xyz" ,Date = DateTime.Today.Subtract(TimeSpan.FromDays(1)), SortOrder = 3},
    new Invoice(){ CustomerName = "xyz" ,Date = DateTime.Today.Subtract(TimeSpan.FromDays(1)), SortOrder = 4},
    new Invoice(){ CustomerName = "Abc" ,Date = DateTime.Today, SortOrder = 5},
    new Invoice(){ CustomerName = "Abc" ,Date = DateTime.Today, SortOrder = 6}
  };

  var invGrouped = new List<List<Invoice>>
   {
     new List<Invoice>
       {
         new Invoice {CustomerName = "Abc", Date = DateTime.Today, SortOrder = 0},
         new Invoice {CustomerName = "Abc", Date = DateTime.Today, SortOrder = 1},
         new Invoice {CustomerName = "Abc", Date = DateTime.Today, SortOrder = 2}
       },
     new List<Invoice>
       {
         new Invoice {CustomerName = "xyz", Date = DateTime.Today.Subtract(TimeSpan.FromDays(1)), SortOrder = 3},
         new Invoice {CustomerName = "xyz", Date = DateTime.Today.Subtract(TimeSpan.FromDays(1)), SortOrder = 4}
       },
     new List<Invoice>
       {
         new Invoice {CustomerName = "Abc", Date = DateTime.Today, SortOrder = 5},
         new Invoice {CustomerName = "Abc", Date = DateTime.Today, SortOrder = 6}

       }
   };

var invGrouped=新列表
{
新名单
{
新发票{CustomerName=“Abc”，日期=日期时间。今天，排序器=0}，
新发票{CustomerName=“Abc”，日期=日期时间。今天，排序器=1}，
新发票{CustomerName=“Abc”，日期=日期时间。今天，排序器=2}
},
新名单
{
新发票{CustomerName=“xyz”，日期=日期时间。今天。减去（TimeSpan.FromDays（1）），排序器=3}，
新发票{CustomerName=“xyz”，日期=日期时间。今天。减去（TimeSpan.FromDays（1）），排序器=4}
},
新名单
{
新发票{CustomerName=“Abc”，日期=日期时间。今天，排序器=5}，
新发票{CustomerName=“Abc”，日期=日期时间。今天，排序器=6}
}
};

更新

---

非LINQ解决方案也就足够了。

这里有一个可能的LINQ解决方案，尽管我确信存在一个更有效的解决方案：

    inv
        .GroupBy(x => new { CustomerName = x.CustomerName, Date = x.Date })
        .SelectMany(x => x
                            .OrderBy(y => y.SortOrder)
                            .Select((y,i) => new { Value = y, Sort = y.SortOrder - i })
                            .GroupBy(y => y.Sort)
                            .Select(y => y.Select(z => z.Value))
        )

---

如果您能够包括一个小样本数据，以及您希望数据分组后的样子，这将非常有帮助。@diceguyd30！我已经更新了问题，为什么底部的两行（客户名称为“Abc”和日期时间为今天）与今天下的另一个客户“Abc”订单不在同一个列表中？因为排序器不是连续的（缺少3和4）。这就是我希望通过询问数据和所需输出来确认的内容。@DoctaJonez@diceguyd30正确理解了它。+1非常感谢。马上回家。我明天就试试。你太棒了！它的工作令人惊讶！！！你帮我省去了很多头痛和时间。我很感谢你。