修复Setting类中静态字段初始化导致的类型初始值设定项异常

Windows/CS/Framework4.0/Toprie/Toprie/Setting.cs

@@ -16,7 +16,18 @@ namespace JoyD.Windows.CS
     public partial class Setting : Form
     {
         // 创建并显示检测配置窗口
-        public static Setting Form = new Setting();
+        private static Setting _formInstance;
+        public static Setting Form 
+        {
+            get
+            {
+                if (_formInstance == null || _formInstance.IsDisposed)
+                {
+                    _formInstance = new Setting();
+                }
+                return _formInstance;
+            }
+        }
         
         // 定时器字段
         private Timer _timer;