如何实现我的特别定制的的CompareTo

Question

所以我有以下struct

public struct Foo 
{ 
    public readonly int FirstLevel; 
    public readonly int SecondLevel; 
    public readonly int ThirdLevel; 
    public readonly int FourthLevel; 
} 

某处我下面

var sequence = new Foo[0]; 
var orderedSequence = sequence 
    .OrderBy(foo => foo.FirstLevel) 
    .ThenBy(foo => foo.SecondLevel) 
    .ThenBy(foo => foo.ThirdLevel) 
    .ThenBy(foo => foo.FourthLevel); 

现在我想实现System.IComparable<Foo>采取如。 .Sort()的Foo[]的优势。

如何将逻辑（从我的特殊/有线OrderBy/ThenBy）转换为int CompareTo(Foo foo)？

Answer 1

什么是这样的：

public struct Foo : IComparable<Foo> 
{ 
    public readonly int FirstLevel; 
    public readonly int SecondLevel; 
    public readonly int ThirdLevel; 
    public readonly int FourthLevel; 

    public int CompareTo(Foo other) 
    { 
     int result; 

     if ((result = this.FirstLevel.CompareTo(other.FirstLevel)) != 0) 
      return result; 
     else if ((result = this.SecondLevel.CompareTo(other.SecondLevel)) != 0) 
      return result; 
     else if ((result = this.ThirdLevel.CompareTo(other.ThirdLevel)) != 0) 
      return result; 
     else 
      return this.FourthLevel.CompareTo(other.FourthLevel); 
    } 
}