c# - 使用 Linq 根据每个项目中的值的总和对列表进行排序

Question

我有另一个 LINQ 计算问题。

我有一个由类项目组成的列表:

List<ProductionClass> Production = new List<ProductionClass>();
Production.Add(new ProductionClass() { Plant = "Plant A", Value1 = 94.4, Value2 = 97.2, Value3 = 71.9, Value4 = 12.8 });
Production.Add(new ProductionClass() { Plant = "Plant B", Value1 = 84.1, Value2 = 95.2, Value3 = 64.8, Value4 = 92.5 });
Production.Add(new ProductionClass() { Plant = "Plant C", Value1 = 43.1, Value2 = 66.3, Value3 = 92.7, Value4 = 84.0 });
Production.Add(new ProductionClass() { Plant = "Plant D", Value1 = 72.6, Value2 = 51.2, Value3 = 87.9, Value4 = 68.1 });

我想重新排序该列表，但基于列表中每个条目的 Value1、2、3 或 Value1、2、3、4 的总和。

因此，我希望将列表保持在其当前形式，并包含所有单独的值，以便我可以遍历它，但我希望它按计算顺序排列。

形式为:

List<ProductionClass> orderedProduction = Production.OrderBy(i => i.Sum(i.Value1 + i.Value2 + i.Value3 + i.Value4)).ToList();

所以对于这个例子，这将是排序的顺序:

{ Plant = "Plant A", Value1 = 94.4, Value2 = 97.2, Value3 = 71.9, Value4 = 12.8 } // Total = 276.3
{ Plant = "Plant D", Value1 = 72.6, Value2 = 51.2, Value3 = 87.9, Value4 = 68.1 } // Total = 279.8
{ Plant = "Plant C", Value1 = 43.1, Value2 = 66.3, Value3 = 92.7, Value4 = 84.0 } // Total = 286.1
{ Plant = "Plant B", Value1 = 84.1, Value2 = 95.2, Value3 = 64.8, Value4 = 92.5 } // Total = 336.6

我怎样才能做到这一点？

Answer 1

List<ProductionClass> orderedProduction = Production
  .OrderBy(saClass => saClass.Value1 + saClass.Value2 + saClass.Value3 + saClass.Value4)
  .ToList();

Sum 方法用于对 IEnumerable 求和。要从您的类中获取属性的总和，只需使用 + 添加值即可。