添加项目文件。

软件系统客户端模版/Program.cs

@@ -0,0 +1,60 @@
+using System;
+using System.Collections.Generic;
+using System.Diagnostics;
+using System.Linq;
+using System.Runtime.InteropServices;
+using System.Windows.Forms;
+
+namespace 软件系统客户端模版
+{
+    static class Program
+    {
+        /// <summary>
+        /// 应用程序的主入口点。
+        /// </summary>
+        [STAThread]
+        static void Main()
+        {
+
+            //=====================================================================
+            //为了强制只启动一个应用程序的实例
+
+            Process process = Process.GetCurrentProcess();
+            //遍历应用程序的同名进程组
+            foreach (Process p in Process.GetProcessesByName(process.ProcessName))
+            {
+                //不是同一进程则关闭刚刚创建的进程
+                if (p.Id != process.Id)
+                {
+                    //此处显示原先的窗口需要一定的时间，不然无法显示
+                    ShowWindowAsync(p.MainWindowHandle, 9);
+                    SetForegroundWindow(p.MainWindowHandle);
+                    System.Threading.Thread.Sleep(10);
+                    Application.Exit();//关闭当前的应用程序
+                    return;
+                }
+            }
+            Application.EnableVisualStyles();
+            Application.SetCompatibleTextRenderingDefault(false);
+
+            //===================================================================
+            //运行主窗口之前先进行账户的验证
+            FormLogin login = new FormLogin();
+            if (login.ShowDialog() == DialogResult.OK)
+            {
+                login.Dispose();
+                Application.Run(new FormMainWindow());
+            }
+            else
+            {
+                login.Dispose();
+            }
+        }
+
+        [DllImport("User32.dll")]
+        private static extern bool ShowWindowAsync(IntPtr hWnd, int cmdShow);
+
+        [DllImport("User32.dll")]
+        private static extern bool SetForegroundWindow(IntPtr hWnd);
+    }
+}