C#: GC

 1 using System; 2 using System.Collections.Generic; 3 using System.Linq; 4 using System.Text; 5 using System.Data; 6 using System.Data.SqlClient; 7  8 namespace FreeResource 9 {10     class TestConn11     {12         public void openConn(int i)13         {14             string connstr = "server=(local);uid=sa;pwd=aaa;database=Test;";15             SqlConnection conn = new SqlConnection(connstr);16             conn.Open();17             //conn.Close();18             //conn.Dispose();19             Console.WriteLine(i);20         }21     22     }23 24     class TestConn2 : IDisposable25     {26         SqlConnection conn;27         public TestConn2()28         {29             string connstr = "server=(local);uid=sa;pwd=aaa;database=Test;";30             this.conn = new SqlConnection(connstr);31         }32 33         public void openConn(int i)34         {35 36             this.conn.Open();            37             //conn.Close();38             //conn.Dispose();39             Console.WriteLine(i);40         }41 42         public void Dispose()43         {44             conn.Close();45             conn.Dispose();46         }47     }48 49 50     class Program51     {52         static void Main(string[] args)53         {54             for (int i = 0; i < 10000; i++)55             {56                 TestConn2 t = new TestConn2();57                 t.openConn(i);58                 t.Dispose();//必須手工調用，並非離開生存期之後就立即由.NET架構調用59             }60             61         }62     }63 }