Question

我目前正在编程一个api，该api是我想用C＃编写的c ++插件，实际上api已经差不多完成了，只有当我遇到一个困扰我几个小时的问题时

问题如下

 // this class is in the api dll file
    public class SingleData
    {
        public static Lazy<SingleData> val = new Lazy<SingleData>(() => new IPlugin());
        public static IPlugin Instance { get { return val.Value; } }

        protected SingleData() { }

        public string Author { get; set; }
        public string Name { get; set; }

        public virtual void plugin_getUser(UserData user) { }
    }    

    // this class is also in the api dll file
    public class DllExport { 
        [DllExport] public static void plugin_getUser(UserData user) { return SingleData.Instance.plugin_getUser(user); }
     }

    // this is NOT in the dll file 
    // I want that people who use my API only make it like this
    public class Main : SingleData {
        public Main() {
           Author = "Hans";
           Name = "test plugin";
        }
        public override void plugin_getUser(UserData user) { 
           Console.WriteLine(user.OnlineTime);
        }    
    }

现在的问题是，如果我删除单身人士，则无法在DllExport类中使用return SingleData.Instance.plugin_getUser Author和Name变量为空。

我现在有一些问题，如何在DllExport类中不必键入return SingleData.instance.plugin_getUser的情况下在Main类中花费事件

另一个问题是，我该如何做不同，但是主类应该与我指定的相同

Answer 1

我认为您可能需要考虑strangely recurring pattern，

    public class SingleData<T> where T : SingleData<T>, new()
    {
        public static Lazy<T> val = new Lazy<T>(() => new T());
        public static IPlugin Instance { get { return val.Value; } }

        protected SingleData() { }

        public string Author { get; set; }
        public string Name { get; set; }

        public virtual void plugin_getUser(UserData user) { }
    }    

    // this class is also in the api dll file
    public class DllExport
    { 
        [DllExport]
        public static void plugin_getUser(UserData user) { return SingleData<Main>.Instance.plugin_getUser(user); }
     }

用法

    public class Main : SingleData<Main>
    {
        public Main()
        {
           Author = "Hans";
           Name = "test plugin";
        }

        public override void plugin_getUser(UserData user)
        { 
           Console.WriteLine(user.OnlineTime);
        }    
    }

从单例实例获取设置为空

1 个答案: