Singleton设计模式

/// <summary>
/// 单实例设计模式
/// </summary>
/// <typeparam name="T">需要实例化的类</typeparam>
public class SingleTon<T> where T : class, new()
{
protected SingleTon() { }
private static T _instance;
private static readonly object _syncRoot = new object();
/// <summary>
/// 获取当前实例
/// </summary>
public static T Instance
{
get
{
if (_instance == null)
{
lock (_syncRoot)
{
//Double-Check双重检查锁定,对于多线程访问时控制
if (_instance == null)
{
_instance = new T();
}
}
}
return _instance;
}
}
}

public class BusinessManager : SingleTon<BusinessManager>
{
public void SayHello()
{
Console.WriteLine("Hello");
}
}

BusinessManager.Instance.SayHello();