c# - Mono 中的通用 IComparable 实现问题

Question

此代码在 .NET 4.0 中成功执行

    public void CompareTest()
    {
        var m1 = new Foo { Order = 1 };
        var m2 = new Foo { Order = 2 };
        var c1 = new Bar { Order = -1 };
        var c2 = new Bar { Order = 3 };
        var list1 = new List<IOrderable> { m1, m2, c1, c2 };
        var list2 = new List<Bar> { c1, c2 };
        list1.Sort();
        list2.Sort();
    }

    public interface IOrderable : IComparable<IOrderable>
    {
        int Order { get; set; }
    }

    public class Foo : IOrderable
    {
        public int Order { get; set; }

        public int CompareTo(IOrderable other)
        {
            return Order.CompareTo(other.Order);
        }
    }

    public class Bar : IOrderable
    {
        public int Order { get; set; }

        public int CompareTo(IOrderable other)
        {
            return Order.CompareTo(other.Order);
        }
    }

但是在 Mono 2.6(在 Unity3D 中)它抛出一个异常:

ArgumentException: does not implement right interface

它抛出第二个排序 (list2.Sort()) 而不是第一个

我对所有这些比较内容有点陌生，所以如果我在这里遗漏了一些明显的东西，请原谅。

为什么提示没有实现正确的接口(interface)？它被实现。知道这里发生了什么吗？为什么它在 .NET 中工作但在 Mono 中不工作？

谢谢。

编辑:全栈

ArgumentException: does not implement right interface
System.Collections.Generic.Comparer`1+DefaultComparer[ShowEmAll.BetterBehaviourEditor+Bar].Compare (ShowEmAll.Bar x, ShowEmAll.Bar y) (at /Users/builduser/buildslave/mono-runtime-and-classlibs/build/mcs/class/corlib/System.Collections.Generic/Comparer.cs:86)
System.Array.compare[Bar] (ShowEmAll.Bar value1, ShowEmAll.Bar value2, IComparer`1 comparer) (at /Users/builduser/buildslave/mono-runtime-and-classlibs/build/mcs/class/corlib/System/Array.cs:1744)
System.Array.qsort[Bar,Bar] (.Bar[] keys, .Bar[] items, Int32 low0, Int32 high0, IComparer`1 comparer) (at /Users/builduser/buildslave/mono-runtime-and-classlibs/build/mcs/class/corlib/System/Array.cs:1721)
System.Array.Sort[Bar,Bar] (.Bar[] keys, .Bar[] items, Int32 index, Int32 length, IComparer`1 comparer) (at /Users/builduser/buildslave/mono-runtime-and-classlibs/build/mcs/class/corlib/System/Array.cs:1674)
Rethrow as InvalidOperationException: The comparer threw an exception.
System.Array.Sort[Bar,Bar] (.Bar[] keys, .Bar[] items, Int32 index, Int32 length, IComparer`1 comparer) (at /Users/builduser/buildslave/mono-runtime-and-classlibs/build/mcs/class/corlib/System/Array.cs:1677)
System.Array.Sort[Bar] (.Bar[] array, Int32 index, Int32 length, IComparer`1 comparer) (at /Users/builduser/buildslave/mono-runtime-and-classlibs/build/mcs/class/corlib/System/Array.cs:1623)
System.Collections.Generic.List`1[ShowEmAll.BetterBehaviourEditor+Bar].Sort () (at /Users/builduser/buildslave/mono-runtime-and-classlibs/build/mcs/class/corlib/System.Collections.Generic/List.cs:568)
ShowEmAll.BetterBehaviourEditor.CompareTest () (at Assets/Vexe/ShowEmAll/Core/Editor/CustomEditors/BetterBehaviourEditor.cs:81)
ShowEmAll.BetterBehaviourEditor.OnEnable () (at Assets/Vexe/ShowEmAll/Core/Editor/CustomEditors/BetterBehaviourEditor.cs:62)

Answer 1

首先，这看起来可能是 Comparer<T>.Default 中的一个 Mono 错误，如果 T 应该注意工具 IComparable<Foo>对于一些 Foo那是一个接口(interface) T工具，或 T 的基本类型.

对于解决方法，有四个选项:

• 实现非通用 IComparable Bar 中的界面，可能只是委托(delegate)给 CompareTo(IOrder) 的实现
• 实现 IComparable<Bar>在Bar ，可能只是委托(delegate)给 CompareTo(IOrder) 的实现
• 始终使用 List<IOrder>即使其中的每一项都是 Bar
• 指定 Comparer<T>至 List<T>.Sort - 我怀疑您可以很容易地使用泛型构建自己的实现。