一个有关List<T>中元素替换的问题
现在我有两个类

    //trans

    public class Trans

    {

        public string name;

        public double fix_x;

        public double fix_y;

        public Trans(string a, double b, double c)

        {

            this.name = a;

            this.fix_x = b;

            this.fix_y = c;

        }

    }

    //Nails

    public class Nails

    {

        public string name;

        public string nail;

    }

这两个类分别用List<Trans>和List<Nails>装起来的,现在我要将List<Trans>中的name替换成List<Nails>中的nail,我写了一个实现方法,但是不知道为什么返回的还是原来的List<Trans>,求解!

        public static List<Trans> change(List<Trans> a,List<Nails> b)

        {

            List<Trans> Transf_new = new List<Trans>();

            Trans nail_new;

            

            foreach (Trans nail in a)

            {

                string c = nail.name;

                foreach (Nails net in b)

                {

                    if (nail.name == net.nail)

                        c = net.name;

                }