C＃中的静态构造函数
我试图使用如下的静态构造函数：
public static DataManager()
{
LastInfoID = 1;
}
没有找到相关结果
已邀请:
5 个回复
盟犯涩沟都
static DataManager() // note no "public" { LastInfoID = 1; }吠强祷豪硅
字段或属性在类中未声明为静态，您只能从静态构造函数中访问静态成员。同时从声明中删除关键字：static DataManager() { LastInfoID = 1; }逝媳蘑贩茄
。静态构造函数的语法是：class MyClass { static MyClass() { // Static constructor } }届甸衬丝蚕
因为您正在调用默认构造函数（前提是您没有定义无参数构造函数）。换句话说，必须将非静态构造函数定义为public的原因是因为您需要显式调用它。如果内存对我很好，C＃将无法编译试图调用未定义为public的（通过malloc）构造函数的代码。 静态类中的构造函数用于“设置”目的。例如，我可以有一个静态类，它应该是我的代码和我不断保存并从中读取数据的文件之间的桥梁。我可以定义一个构造函数，在创建对象时，它将确保文件存在，如果不存在则创建默认文件（在移植到其他服务器的Web系统中非常有用）。哭木算
using System; public class Something { // private static DateTime _saticConstructorTime; private DateTime _instanceConstructorTime; // public static DateTime SaticConstructorTime { set { _saticConstructorTime = value; } get { return _saticConstructorTime ; } } public DateTime InstanceConstructorTime { set { _instanceConstructorTime = value; } get { return _instanceConstructorTime; } } //Set value to static propriety static Something() { SaticConstructorTime = DateTime.Now; Console.WriteLine("Static constructor has been executed at: {0}", SaticConstructorTime.ToLongTimeString()); } //The second constructor started alone at the next instances public Something(string s) { InstanceConstructorTime = DateTime.Now; Console.WriteLine("New instances: "+ s +"n"); } public void TimeDisplay(string s) { Console.WriteLine("Instance ""+ s + "" has been created at: " + InstanceConstructorTime.ToLongTimeString()); Console.WriteLine("Static constructor has been created at: " + SaticConstructorTime.ToLongTimeString() + "n"); } } // class Client { static void Main() { Something somethingA = new Something("somethingA"); System.Threading.Thread.Sleep(2000); Something somethingB = new Something("somethingB"); somethingA.TimeDisplay("somethingA"); somethingB.TimeDisplay("somethingB"); System.Console.ReadKey(); } } /* output : Static constructor has been executed at: 17:31:28 New instances: somethingA New instances: somethingB Instance "somethingA" has been created at: 17:31:28 Static constructor has been created at: 17:31:28 Instance "somethingB" has been created at: 17:31:30 Static constructor has been created at: 17:31:28 */