C#将3个列表与Linq连接

我想加入3个具有以下格式的列表：

List1:
  CountryID | CountryData     | regionUID
  ===================================
         12 | Has good gras   | 4567
         12 | nice weather    | 6789
         16 | stormy weather  | 1234

List2:
  CountryID | CountryName
  =======================
         12 | green hill
         16 | stormy mountain

List3:
  regionUID | regionName
  =======================
       4567 | above 1000feet
       6789 | on the ground
       1234 | on the hill

输出应如下所示：

CountryName      | CountryData      | regionName
==============================================
 green hill      | Has good gras    | above 1000feet
 green hill      | nice weather     | on the ground
 stormy mountain | stormy weather   | on the hill

---

地区独特且国家可以容纳多条线路的地方

您想要这样的东西：

var list1 = new []{
    new { CountryID = 12, CountryData = "Has good gras", regionUID = 4567  },
    new { CountryID = 12, CountryData = "nice weather", regionUID = 6789  },
    new { CountryID = 16, CountryData = "stormy weather", regionUID = 1234 }};

var list2 = new []{
    new { CountryID = 12, CountryName = "green hill"},
    new { CountryID = 16, CountryName = "stormy mountain"}
};

var list3 = new []{
    new {regionUID = 4567, regionName = "above 1000feet"},
    new {regionUID = 6789, regionName = "on the ground"},
    new {regionUID = 1234, regionName = "on the hill"}
};

var result = from m1 in list1
    join m2 in list2 on m1.CountryID equals m2.CountryID
    select new { m2.CountryName, m1.CountryData, m1.regionUID } into intermediate
    join m3 in list3 on intermediate.regionUID equals m3.regionUID
    select new { intermediate.CountryName, intermediate.CountryData, m3.regionName};

---

RW

如果您只是对LINQ连接的语法感兴趣，请参阅在Google中简单地键入

使用LINQ c连接列表

将返回大量关于此问题的好答案-1由于没有研究工作。