c# - 为泛型类实现 IComparable 接口(interface)以比较类型 T

Question

我尝试使用 IComparable<T>在泛型类中比较 T 类型的元素时出现以下错误:

"Operator '<' cannot be applied to operands of type 'T' and 'T'"

我想知道是否可以解决这个问题。这是一个简单的例子 IComparable<T>当我定义我的类(class)接受 int 时正在工作:

public class IntStack : IComparable<IntStack>
{
    public int[] stack = new int[2];

    public int CompareTo(IntStack other)
    {
        // If the current stack < other stack return -1
        // If the current stack > other stack return +1
        // If current stack entries == other stack entries return 0
        for (var current = 0; current < 2; current++)
        {
            if (stack[current] < other.stack[current])
            {
                return -1;
            }
            else if (stack[current] > other.stack[current])
            {
                return 1;
            }
        }
        return 0;
    }
}

IComparable<T>当我将上面的类更改为通用时，现在在这里不起作用:

public class Mystack<T> : IComparable<Mystack<T>> where T : IComparable
{
    public T[] stack = new T[2];

    public int CompareTo(Mystack<T> other)
    {
        // If the current stack < other stack return -1
        // If the current stack > other stack return +1
        // If current stack entries == other stack entries return 0
        for (var current = 0; current < 2; current++)
        {
            if (stack[current] < other.stack[current])
            {
                return -1;
            }
            else if (stack[current] > other.stack[current])
            {
                return 1;
            }
        }
        return 0;
    }

Answer 1

您收到此错误的原因是您不能对 IComparable 使用不等运算符(“<”、“>”)，除非您覆盖它们。

您可以改用 CompareTo()。

public class Mystack<T> : IComparable<Mystack<T>> where T : IComparable
{
public T[] stack = new T[2];

public int CompareTo(Mystack<T> other)
{
    // If the current stack < other stack return -1
    // If the current stack > other stack return +1
    // If current stack entries == other stack entries return 0
    for (var current = 0; current < 2; current++)
    {
        if (stack[current].CompareTo(other.stack[current]) < 0)
        {
            return -1;
        }
        else if (stack[current].CompareTo(other.stack[current]) > 0)
        {
            return 1;
        }
    }
    return 0;
}