Generics 具有多个返回类型的泛型类
我知道我的问题问得并不完美,但相当难,因此我将举一个例子: 所以我有一个类抽象处理程序。我使用另一个类中的方法创建它:Generics 具有多个返回类型的泛型类,generics,return-type,Generics,Return Type,我知道我的问题问得并不完美,但相当难,因此我将举一个例子: 所以我有一个类抽象处理程序。我使用另一个类中的方法创建它: class AbstractManager { BinarySerializator binarySerializator; //just for the example TextSerializator textSerializator; public AbstractManager(BinarySerializator binarySeri
class AbstractManager
{
BinarySerializator binarySerializator; //just for the example
TextSerializator textSerializator;
public AbstractManager(BinarySerializator binarySerializator) {
this.binarySerializator = binarySerializator;
this.textSerializator = null;
}
public AbstractManager(TextSerializator textSerializator) {
this.textSerializator = textSerializator;
this.binarySerializator = null;
}
public AbstractHandler createHandler() {
if (this.binarySerializator != null) {
return new AbstractHandler<byte[]>(this.binarySerializator);
} else {
return new AbstractHandler<String>(this.textSerializator);
}
}
}
我的问题是——这是这样做的吗?还有两个构造函数的解决方法,以及如何处理两个不同的AbstractHandler,我知道可以使用泛型而不是设计两个类(一个用于String,一个用于byte[])。感谢您花时间阅读这篇长篇文章。我有两个解决方案:
接口:
现在,在您的问题上应用这一点应该不会有麻烦。听起来您应该使用策略模式和他的界面。
public T createSerializable(Object object) {
if (binarySerializer != null) {
return (T) binarySerializer.getSerializedType(object);
}
if (textSerializer != null) {
return (T) textSerializer.getSerializedType(object);
}
}
interface ISerializatorStategy
{
object GetSerializedType(object obj);
}
// If you want generic classes
interface ISerializatorStategy<T> : ISerializatorStategy
{
new T GetSerializedType(object obj);
}
// If you don't want generic classes
// you can inherit from the base interface and implement only its method
class TextSerializator : ISerializatorStategy<string>
{
public string GetSerializedType(object obj)
{
return "Hello World";
}
object ISerializatorStategy.GetSerializedType(object obj)
{
return GetSerializedType(obj);
}
}
class IntSerializator : ISerializatorStategy<int>
{
public int GetSerializedType(object obj)
{
return 42;
}
object ISerializatorStategy.GetSerializedType(object obj)
{
return GetSerializedType(obj);
}
}
class AbstractManager
{
protected ISerializatorStategy SerializatorStrategy { get; set; }
public AbstractManager(ISerializatorStategy serializatorStrategy)
{
SerializatorStrategy = serializatorStrategy;
}
public AbstractHandler CreateHandler()
{
return new AbstractHandler(SerializatorStrategy);
}
}
// If you want generic classes
class AbstractManager<T> : AbstractManager
{
// Note, if you allow this constructor,
// you could encounter runtime errors
public AbstractManager(ISerializatorStategy serializatorStrategy)
: base(serializatorStrategy)
{
}
public AbstractManager(ISerializatorStategy<T> serializatorStrategy)
: base(serializatorStrategy)
{
}
public new AbstractHandler<T> CreateHandler()
{
return new AbstractHandler<T>(SerializatorStrategy);
}
}
class AbstractHandler
{
private readonly ISerializatorStategy _serializatorStrategy;
public AbstractHandler(ISerializatorStategy serializatorStrategy)
{
_serializatorStrategy = serializatorStrategy;
}
public object CreateSerializable(object obj)
{
return _serializatorStrategy.GetSerializedType(obj);
}
public void GetSerializable<T>(object obj, out T serializebleObject)
{
serializebleObject = (T)_serializatorStrategy.GetSerializedType(obj);
}
}
// If you want generic classes
class AbstractHandler<T> : AbstractHandler
{
// Note, if you allow this constructor,
// you could encounter runtime errors
public AbstractHandler(ISerializatorStategy serializatorStrategy)
: base(serializatorStrategy)
{
}
public AbstractHandler(ISerializatorStategy<T> serializatorStrategy)
: base(serializatorStrategy)
{
}
public new T CreateSerializable(object obj)
{
return (T)base.CreateSerializable(obj);
}
}
class Program
{
static void Main(string[] args)
{
var textManager = new AbstractManager<string>(new TextSerializator());
var textHandler = textManager.CreateHandler();
string textResult = textHandler.CreateSerializable(null); // or AbstractHandler<string> as type
Console.WriteLine(textResult);
var intManager = new AbstractManager<int>(new IntSerializator());
var intHandler = intManager.CreateHandler(); // or AbstractHandler<int> as type
int intResult = intHandler.CreateSerializable(null);
Console.WriteLine(intResult);
Console.ReadKey();
}
}
class Program
{
static void Main(string[] args)
{
AbstractManager manager = new AbstractManager(new TextSerializator());
AbstractHandler handler = manager.createHandler();
string textResult;
handler.GetSerializable(null, out textResult);
Console.WriteLine(textResult);
manager = new AbstractManager(new IntSerializator());
handler = manager.createHandler();
int intResult;
handler.GetSerializable(null, out intResult);
Console.WriteLine(intResult);
Console.ReadKey();
}
}