如何将我的特殊订购实施为 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;
}

在某处执行以下操作

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 来采取例如。利用 Foo[] 的 .Sort() 的优点。

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

Answer 1

怎么样：

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);
    }
}