相关疑难解决方法(0)

这是我直到今天才注意到的事情.显然,当执行基于相等的操作时Tuple<T>,很多使用的元组类(Tuple<T1, T2>等)的.NET实现会导致值类型的装箱惩罚.

以下是该类在框架中的实现方式(来自ILSpy的源代码):

public class Tuple<T1, T2> : IStructuralEquatable 
{
    public T1 Item1 { get; private set; }
    public T2 Item2 { get; private set; }

    public Tuple(T1 item1, T2 item2)
    {
        this.Item1 = item1;
        this.Item2 = item2;
    }

    public override bool Equals(object obj)
    {
        return this.Equals(obj, EqualityComparer<object>.Default);
    }

    public override int GetHashCode()
    {
        return this.GetHashCode(EqualityComparer<object>.Default);
    }

    public bool Equals(object obj, IEqualityComparer comparer)
    {
        if (obj == null)
        {
            return false;
        }

        var tuple …