防止在C#中创建具有静态实例的类

public class Singleton
{
    private static Singleton instance = null;

    private Singleton()
    {
        // 私有构造函数
    }

    public static Singleton Instance
    {
        get
        {
            if (instance == null)
            {
                instance = new Singleton();
            }
            return instance;
        }
    }
}

public static class StaticClass
{
    public static void Method()
    {
        // 静态方法
    }
}

public class Singleton
{
    private static Singleton instance = null;

    private Singleton()
    {
        // 私有构造函数
    }

    public static Singleton Instance
    {
        get
        {
            if (instance == null)
            {
                instance = new Singleton();
            }
            return instance;
        }
    }
}

public class Singleton<T>
{
    private static T instance = default(T);

    private Singleton()
    {
        // 私有构造函数
    }

    public static T Instance
    {
        get
        {
            if (instance == null)
            {
                instance = Activator.CreateInstance<T>();
            }
            return instance;
        }
    }
}