c＃Linq删除重复项并计算平均值

Question

例如，我有一个对象列表（属性：名称和值）

• item1 20;
• item2 30;
• item1 50;

我想要结果：

• item1 35（20 + 50）/ 2
• item2 30

我该怎么做？

感谢

抱歉，重复是基于item.Name。

Answer 1

var results =
  from kvp in source
  group kvp by kvp.Key.ToUpper() into g
  select new
  {
    Key= g.Key,
    Value= g.Average(kvp => kvp.Value)
  }

或

var results = source.GroupBy(c=>c.Name)
                  .Select(c => new (c.Key, c.Average(d=>d.Value)));

Answer 2

您可以使用平均值和分组来执行此操作：

public class myObject
{
    public string Name {get;set;}
    public double Value {get;set;}
}

var testData = new List<myObject>() { 
                                    new myObject() { Name = "item1", Value = 20 },
                                    new myObject() { Name = "item2", Value = 30 },
                                    new myObject() { Name = "item1", Value = 50 }
                                    };


var result = from x in testData
             group x by x.Name into grp
             select new myObject() { 
                                    Name=grp.Key,
                                    Value= grp.Average(obj => obj.Value)
                                    };