.net - Powershell 和覆盖比较运算符

Question

如何创建一个对象，当它的操作符时，例如:

operator > (Object obj1, Object obj2)  
operator < (Object obj1, Object obj2)

，被覆盖的 PowerShell 是否利用了这些运算符？

这样:

where-object { $CustomObject -gt 12 } 

会打电话:

public static bool operator > (Object object1, Object object2)

是否可以？

澄清:

对象存在于 .NET 程序集中

对象已覆盖比较运算符

PowerShell 似乎不尊重这些运算符

Answer 1

PowerShell 使用 IComparable 接口(interface)来比较对象。至少，这是以下小实验所显示的:

$src = @'
using System;
namespace Acme 
{
    public class Foo : IComparable
    {
        public Foo(int value)
        {
            this.Value = value;
        }

        public int Value { get; private set; }

        public static bool operator >(Foo foo1, Foo foo2)
        {
            Console.WriteLine("In operator >");
            return (foo1.Value > foo2.Value);
        }

        public static bool operator <(Foo foo1, Foo foo2)
        {
            Console.WriteLine("In operator <");
            return (foo1.Value < foo2.Value);
        }

        public int CompareTo(object obj)
        {
            Console.WriteLine("In CompareTo");
            if (obj == null) return 1;

            Foo foo2 = obj as Foo;
            if (foo2 == null) throw new ArgumentException("Not type Foo","obj");

            if (this.Value == foo2.Value)
            {
                return 0;
            }
            else if (this.Value > foo2.Value)
            {
                return 1;
            }
            else 
            {
                return -1;
            }
        }
    }
}
'@

Add-Type -TypeDefinition $src -Language CSharpVersion3

$foo1 = new-object Acme.Foo 4
$foo2 = new-object Acme.Foo 8

$foo1 -gt $foo2
In CompareTo
False