【c#】如何使程序只有唯一运行实例

一、利用进程间同步实现
效果：
 
代码：

static   void  Main()
         ... {
            bool b;
            Mutex m = new Mutex( true, "JueJue1984", out b );
            if( !b )
            ...{
                MessageBox.Show( "³ÌÐòÒѾ­ÔÚÔËÐÐÁË£¡", "Ô¹ⱦºÐ2007V1.0" );
            }
            else
            ...{
                Application.EnableVisualStyles();
                Application.DoEvents();
                Application.Run( new MyCode() );
                m.ReleaseMutex();
            }
        }

二、用句柄实现
效果：
 
代码：
   

public   static   void  Main()
         ... {
            try
            ...{
                IntPtr hMutex=ApiFunction.CreateMutex(null,false,"jbgh");
                if (ApiFunction.GetLastError()!=ApiFunction.ERROR_ALREADY_EXISTS)
                ...{
                    Application.ThreadException +=new System.Threading.ThreadExceptionEventHandler(OnThreadException);
                       
                        Application.Run(new FrmMdiMain());
                    }
                    else
                        Application.Exit();
                }
                else
                ...{
                    MessageBox.Show("Ò½ÔºÐÅϢϵͳÒѾ­ÔËÐУ¡","Ìáʾ",MessageBoxButtons.OK,MessageBoxIcon.Information);
                    ApiFunction.ReleaseMutex(hMutex);
                }
            }
             catch (Exception err)
             ... {
                MessageBox.Show(err.Message,"´íÎó",MessageBoxButtons.OK,MessageBoxIcon.Warning);
                Application.Exit();
            }        
        }
       
private   static   void  OnThreadException( object  sender, ThreadExceptionEventArgs t)
         ... {
            MessageBox.Show(t.Exception.Message,"´íÎó",MessageBoxButtons.OK,MessageBoxIcon.Warning);
        }