GenericClassInherit

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplication1
{
    class GenericClassInherit
    {
        //C# 编译器只允许将泛型参数隐式强制转换到 Object 或约束指定的类型 
        public interface ISomeInterface
        { }
        class BaseClass
        { }
        class MyClass<T> where T : BaseClass, ISomeInterface
        {
            void SomeMethod(T t)
            {
                ISomeInterface obj1 = t;
                BaseClass obj2 = t;
                object obj3 = t;
            }
        }

        //编译器允许您将泛型参数显式强制转换到其他任何接口，但不能将其转换到类
        class SomeClass
        { }
        class MyClass1<T>
        {
            void SomeMethod(T t)
            {
                ISomeInterface obj1 = (ISomeInterface)t;  //Compiles  
                //SomeClass obj2 = (SomeClass)t;           //Does not compile  
            }
        }  

 

        //使用临时的 Object 变量，将泛型参数强制转换到其他任何类型
        class MyClass2<T>
        {
            void SomeMethod(T t)
            {
                object temp = t;
                SomeClass obj = (SomeClass)temp;
            }
        }

        //使用is和as运算符#region 使用is和as运算符  
        public class MyClass3<T>
        {
            public void SomeMethod(T t)
            {
            //    if (t is int) { }
            //    if (t is LinkedList<int, string>) { }
            //    string str = t as string;
            //    if (str != null) { }
            //    LinkedList<int, string> list = t as LinkedList<int, string>;
            //    if (list != null) { }
            }
        }

 

    }
}