c# - 如何按两个属性对这个简单的 .NET 列表进行排序？

Question

给定位置的列表，我需要执行 2 个排序步骤。

1. 按 LocationType 升序排列。
2. 对于每个位置类型值，按 Name 升序排列这些结果。

示例数据:

Location Type | Name
            2 | Templestowe Lower
            2 | Templestowe
            1 | Melbourne

预期结果:

1. Melbourne
2. Templestowe
3. Templestowe Lower

Here is a (not working) .NET Fiddle ...

这是主要代码(从那个 fiddle 复制的)..

private class Location
{
    public Location (string name, int locationType)
    {
        Name = name;
        LocationType = locationType;
    }

    public string Name { get; private set; }
    public int LocationType { get; private set;}
}

public static void Main()
{

    var locations = new List<Location> 
    {
        new Location("Templestowe Lower", 2),
        new Location("Templestowe", 2),
        new Location("Melbourne", 1)
    };

    // TODO: return a list, sorted by LocationType and name.
    var results = XXXXX;

    foreach(var location in results)
    {
        Console.WriteLine(location.Name);
    }
}

Answer 1

locations.Sort((x,y) => {
   int delta = x.LocationType.CompareTo(y.LocationType);
   if(delta == 0) delta = string.Compare(x.Name, y.Name);
   return delta;
});

或者:

var results = locations.OrderBy(x => x.LocationType).ThenBy(x => x.Name);

或者在 LINQ 语法中(编译成相同的东西):

var results = from loc in locations
              orderby loc.LocationType, loc.Name
              select loc;