[英]C# Generics / General Types
static Dictionary<Type, Action<object>> handlers;
public static void Main (string[] args)
{
handlers = new Dictionary<Type, Action<object>>();
AddHandler<One>((object rawOne) => { One one = (One)rawOne; Console.WriteLine(one.Data); });
AddHandler<Two>((object rawTwo) => { Two two = (Two)rawTwo; Console.WriteLine(two.Data); });
Handle(new One("Test"));
Handle(new Two(123));
}
public static void AddHandler<T>(Action<object> handler)
{
handlers[typeof(T)] = handler;
}
public static void Handle(object data)
{
handlers[data.GetType()].Invoke(data);
}
由於缺少更好的措辭:我將如何以不必鑄造rawOne和rawTwo的方式進行制作?
基本上,我想要這樣:
AddHandler<One>((object rawOne) => { One one = (One)rawOne;
Console.WriteLine(one.Data); });
看起來像這樣:
AddHandler<One>((One one) => { Console.WriteLine(one.Data); };
但是,我不確定該如何完成。 顯然,我必須以某種方式修改字典,但是我不知道該怎么做。
像這樣:
public static void AddHandler<T>(Action<T> handler)
{
handlers[typeof(T)] = o => handler((T)o);
}
此外,由於編譯器可以推斷出有關您的類型的某些信息,因此您可以這樣說:
AddHandler((One one) => { Console.WriteLine(one.Data); };
... 或這個:
AddHandler<One>(one => { Console.WriteLine(one.Data); };
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