前面加上显式接口名

 interface Information
    {
        string Code { set; get; }
        string Name { set; get; }
        void ShowInfo();

    }

    interface Information2
    {
        string Code { set; get; }
        string Name { set; get; }
        void ShowInfo();

    }

    public class Jhinfo:Information,Information2
    {
        string code="";
        string name = "";
      string Information.Code
        {
            get
            {
                return code;

            }
            set
            {
                code = value;
            }

        }
       string Information.Name
        {
            get
            {
                return name;
            }
            set
            {
                name = value;
            }
        }
    void Information.ShowInfo()
        {
            Console.WriteLine(Information.Code + Information.Code);
        }

            public void inf()
        {
            Console.WriteLine("ok");
        }

    }

感觉依然不对

interface Information

{

    string Code { get; set; }

    string Name { get; set; }

    void ShowInfo();

}

interface Information2

{

    string Code { get; set; }

    string Name { get; set; }

    void ShowInfo();

}

public class Jhinfo : Information, Information2

{

    string Information.Code { get; set; }

    string Information2.Code { get; set; }

    string Information.Name { get; set; }

    string Information2.Name { get; set; }

    void Information.ShowInfo()

    {

        Information i = new Jhinfo();

        Console.WriteLine(i.Code+i.Name);

    }

    void Information2.ShowInfo()

    {

    }

}