c# - 我应该把我的代码放在 Singleton 中的什么地方？

Question

我正在链接到以下问题 --> https://stackoverflow.com/a/2550935/46724 特别是 Jon Skeet 的代码:

public sealed class Singleton
 {
     private static readonly Singleton instance = new Singleton();
     public static Singleton Instance { get { return instance; } }

     static Singleton() {}
     private Singleton() {}
 }

我想知道的是，我应该把初始化所需的任何逻辑放在哪里？私有(private)或静态构造函数？按照逻辑，我的意思是我的 Singleton 是我的 DapperLite 连接，所以我需要像这样初始化映射:

Database = new SqliteDatabase<int>(myConn);
Database.Init();

---

编辑:我坚持使用 Compact Framework 3.5 和 VS 2008 以供引用。

Answer 1

如果你的类中有任何需要的静态字段，它应该在这个构造函数中初始化 static Singleton() {}对于任何其他实例字段或属性，它应该是 private Singleton() { 有关更多信息，请查看以下代码

 public class Bus
    {
        // Static variable used by all Bus instances. 
        // Represents the time the first bus of the day starts its route. 
        protected static readonly DateTime globalStartTime;

        // Property for the number of each bus. 
        protected int RouteNumber { get; set; }

        // Static constructor to initialize the static variable. 
        // It is invoked before the first instance constructor is run. 
        static Bus()
        {
            globalStartTime = DateTime.Now;

            // The following statement produces the first line of output,  
            // and the line occurs only once.
            Console.WriteLine("Static constructor sets global start time to {0}",
                globalStartTime.ToLongTimeString());
        }

        // Instance constructor. 
        public Bus(int routeNum)
        {
            RouteNumber = routeNum;
            Console.WriteLine("Bus #{0} is created.", RouteNumber);
        }

        // Instance method. 
        public void Drive()
        {
            TimeSpan elapsedTime = DateTime.Now - globalStartTime;

            // For demonstration purposes we treat milliseconds as minutes to simulate 
            // actual bus times. Do not do this in your actual bus schedule program!
            Console.WriteLine("{0} is starting its route {1:N2} minutes after global start time {2}.",
                                    this.RouteNumber,
                                    elapsedTime.TotalMilliseconds,
                                    globalStartTime.ToShortTimeString());
        }
    }

    class TestBus
    {
        static void Main()
        {
            // The creation of this instance activates the static constructor.
            Bus bus1 = new Bus(71);

            // Create a second bus.
            Bus bus2 = new Bus(72);

            // Send bus1 on its way.
            bus1.Drive();

            // Wait for bus2 to warm up.
            System.Threading.Thread.Sleep(25);

            // Send bus2 on its way.
            bus2.Drive();

            // Keep the console window open in debug mode.
            System.Console.WriteLine("Press any key to exit.");
            System.Console.ReadKey();
        }
    }

所以在你的例子中是一个实例初始化

 private Singleton() 
{
Database = new SqliteDatabase<int>(myConn);
Database.Init();
}