C# 范型编程

Using directives

namespace  GenericsSingleton
{
    
/// <summary>
    
/// 单例范型
    
/// </summary>
    
/// <typeparam name="T"></typeparam>

    public class Singleton<T>
    
{
        
private static T _instance;

        
public Singleton()
        
{
        }


        
public static T Instance
        
{
            
get
            
{
                
if (_instance == null)
                
{  

                   
//获得实例,使用这个方法的前提是T要有公有的、无参数的构造函数               

                   _instance 
= (T)System.Activator.CreateInstance(typeof(T));
                }

                
return _instance;
            }

        }

    }


    
/// <summary>
    
/// 要实现单例的类
    
/// </summary>

    public class Foo
    
{
        
private int count = 0;

        
public int Count
        
{
            
get
            
{
                count
++;
                
return count;
            }

        }

    }


    
/// <summary>
    
/// 主函数
    
/// </summary>

    class Program
    
{
        
static void Main(string[] args)
        
{
            
//连续调用三次如果值是递增的话说明三次调用都是同一个实例
            Console.WriteLine(Singleton<Foo>.Instance.Count);
            Console.WriteLine(Singleton
<Foo>.Instance.Count);
            Console.WriteLine(Singleton
<Foo>.Instance.Count);

            Console.ReadLine();
        }

    }

}

 
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