class1.cs

C#开发教程 由浅入深 配有实例 是初学者的好帮手

using System;

namespace StaticMethods
{
	class SQLServerDb
	{
		// bunch of other non-salient members
		public static void RepairDatabase()
		{
			Console.WriteLine("repairing database...");
		}

		static string progressString1 = "starting repair..."; 
		string progressString2 = "...repair finished";

		public static void RepairWithStrings()
		{
			Console.WriteLine(progressString1); // OK
//			Console.WriteLine(progressString2); // illegal
		}

		public void InstanceRepair()
		{
			Console.WriteLine(progressString1); // OK
			Console.WriteLine(progressString2); // OK
		}

		public SQLServerDb() {}

		public SQLServerDb(string s1, string s2)
		{
//			this.progressString1 = s1;	// illegal
			this.progressString2 = s2;
		}
	}

	class Test
	{
		[STAThread]
		static void Main(string[] args)
		{
			SQLServerDb.RepairDatabase();

			Console.WriteLine();
			SQLServerDb db = new SQLServerDb();
//			db.RepairDatabase();		// illegal

			Console.WriteLine();
			SQLServerDb.RepairWithStrings();

			Console.WriteLine();
			db.InstanceRepair();
		}
	}
}