WinForm 窗体中实现单例模式

方式一: 单进程的实现

View Code

 1    static class Program
 2     {
 3         /// <summary>
 4         /// 应用程序的主入口点。
 5         /// </summary>
 6         [STAThread]
 7         static void Main()
 8         {
 9             Application.EnableVisualStyles();
10             Application.SetCompatibleTextRenderingDefault(false);
11             
12             //获取当前进程名称
13             string currentProcessName = Process.GetCurrentProcess().ProcessName;
14 
15             //把该名称的所有进程的列表
16             Process[] process = Process.GetProcessesByName(currentProcessName);
17 
18             if (process.Length > 1)
19             {
20                 MessageBox.Show("程序已经运行");
21                 return;
22             }
23             Application.Run(new ThMain());
24         }
25     }

方式二:窗体单例模式的实现

 public static Form1 thMian = null;

 /// <summary>
        /// 获取单个实例
        /// </summary>
        /// <returns></returns>
        public static Form1 GetInstance()
        {
            if (thMian == null || thMian.IsDisposed == true)  //newForm.IsDisposed == true必需，否则会出现“访问已释放资源”的异常
            {
                thMian = new Form1();
            }
            else
            {
                thMian.Activate();
            }
            return thMian;
        }

调用:
  GetInstance();
  thMian.Show();