即使使用IEqualityComparer，也无法从LINQ对象中删除重复项

Question

我在订单和标签之间没有直接联系，因此我通过与订单具有多对多关系并且与标签具有多对多关系的文章进行了研究。一个标签可以有多个变量。

当我执行此查询时，我想获取标签和与其连接的所有文章的列表。有点相反的方式。

我得到的结果有点奇怪。它会复制标签两次或更多次，具体取决于连接到指定订单的商品数量

var returnedList = await _unitOfWork.Repository<Order>().FindByIncludeAsync(x => x.OrderId == id, 
                    g => 
                        g.Include(p => p.OrderArticles)
                        .ThenInclude(t => t.Article)
                        .ThenInclude(h => h.LabelArticles)
                        .ThenInclude(j => j.Label)
                        .ThenInclude(f => f.Variables));

var result = returnedList.Select(x => new
{
                    x.OrderId, 
                    x.OrderNumber,
                    OrderInfo = x.OrderArticles.Select(t => new
                    {
                        Labels = t.Article.LabelArticles.Select(h => new
                        {
                            h.Label.LabelId,
                            h.Label.Name, 
                            EditableVariables = h.Label.Variables.Where(l => l.VariableEditType == VariableEditType.Editable).Select(m => new
                            {
                                m.VariableId, 
                                m.VariableName,
                                m.PropertySize
                            }),
                            ConnectedArticles = h.Label.LabelArticles.Select(e => new
                            {
                                e.Article.ArticleId, 
                                e.Article.Name
                            })
                        }).GroupBy(z => z.LabelId).Select(o => o.FirstOrDefault())

                    }).FirstOrDefault()
                }).ToList();


                return Ok(result);

当前结果：

[
  {
    "orderId": 1,
    "orderNumber": "42253",
    "orderInfo": [
      {
        "label": {
          "labelId": 1,
          "name": "Patient.nlbl",
          "editableVariables": [
            {
              "variableId": 1,
              "variableName": "Hospital",
              "propertySize": "30"
            },
            {
              "variableId": 3,
              "variableName": "Sex",
              "propertySize": "1"
            },
            {
              "variableId": 5,
              "variableName": "First name",
              "propertySize": "30"
            },
            {
              "variableId": 7,
              "variableName": "Blood type",
              "propertySize": "11"
            }
          ],
          "connectedArticles": [
            {
              "articleId": 20,
              "name": "Things"
            },
            {
              "articleId": 21,
              "name": "More things"
            }
          ]
        }
      },
      {
        "label": {
          "labelId": 1,
          "name": "Patient.nlbl",
          "editableVariables": [
            {
              "variableId": 1,
              "variableName": "Hospital",
              "propertySize": "30"
            },
            {
              "variableId": 3,
              "variableName": "Sex",
              "propertySize": "1"
            },
            {
              "variableId": 5,
              "variableName": "First name",
              "propertySize": "30"
            },
            {
              "variableId": 7,
              "variableName": "Blood type",
              "propertySize": "11"
            }
          ],
          "connectedArticles": [
            {
              "articleId": 20,
              "name": "Things"
            },
            {
              "articleId": 21,
              "name": "More things"
            }
          ]
        }
      },
      {
        "label": {
          "labelId": 3,
          "name": "Report.nlbl",
          "editableVariables": [
            {
              "variableId": 11,
              "variableName": "TotalPrice",
              "propertySize": "10"
            },
            {
              "variableId": 13,
              "variableName": "Qty",
              "propertySize": "10"
            },
            {
              "variableId": 15,
              "variableName": "ID",
              "propertySize": "10"
            },
            {
              "variableId": 17,
              "variableName": "BillTo",
              "propertySize": "20"
            }
          ],
          "connectedArticles": [
            {
              "articleId": 22,
              "name": "article1"
            },
            {
              "articleId": 23,
              "name": "Robot"
            }
          ]
        }
      },
      {
        "label": {
          "labelId": 3,
          "name": "Report.nlbl",
          "editableVariables": [
            {
              "variableId": 11,
              "variableName": "TotalPrice",
              "propertySize": "10"
            },
            {
              "variableId": 13,
              "variableName": "Qty",
              "propertySize": "10"
            },
            {
              "variableId": 15,
              "variableName": "ID",
              "propertySize": "10"
            },
            {
              "variableId": 17,
              "variableName": "BillTo",
              "propertySize": "20"
            }
          ],
          "connectedArticles": [
            {
              "articleId": 22,
              "name": "article1"
            },
            {
              "articleId": 23,
              "name": "Robot"
            }
          ]
        }
      }
    ]
  }
]

因此，如您所见，我得到了LabelId 1和3的重复。我认为这取决于一个事实，即与订单关联的商品数量将决定重复发生的次数。

我试图按LabelId将结果分组，然后选择firstorDefault，但仍然得到重新排列。

我如何摆脱它们？