加载界面、程序关闭界面、单例模式

DHSoftware/Views/WelcomeWindow.cs

@@ -15,9 +15,22 @@ namespace DHSoftware.Views
         public WelcomeWindow()
         {
             InitializeComponent();
-
-
-          
+            Control.CheckForIllegalCrossThreadCalls = false;
         }
+
+        /// <summary>
+        /// 窗体对象实例
+        /// </summary>
+        private static WelcomeWindow _instance;
+        internal static WelcomeWindow Instance
+        {
+            get
+            {
+                if (_instance == null)
+                    _instance = new WelcomeWindow();
+                return _instance;
+            }
+        }
+
     }
 }