修改工单流程页面，订单列表增加工单按钮

WxOrder.Framework/Commons/Dialogs/DialogService.cs

@@ -12,7 +12,41 @@ namespace WxOrder.Framework.Commons.Dialogs
 	public static class DialogService
 	{
 		// ========== 对外接口 ==========
+		public static bool ExistsWindow(FrameworkElement view)
+		{
+			var window = Application.Current.Windows.OfType<Window>().FirstOrDefault(w => w.Content != null && w.Content.GetType() == view.GetType());
+			return window != null;
+		}
+		public static void ActivateWindow(FrameworkElement view)
+		{
+			var window = Application.Current.Windows.OfType<Window>().FirstOrDefault(w => w.Content != null && w.Content.GetType() == view.GetType());
+			if (window == null)
+				return;
 
+			if (!window.IsVisible)
+				window.Show();
+			if (window.WindowState == WindowState.Minimized)
+				window.WindowState = WindowState.Normal;
+
+			if (!window.Activate())
+			{
+				// 窗口被其他进程遮挡时，短暂置顶以切换到用户面前。
+				window.Topmost = true;
+				window.Topmost = false;
+				window.Activate();
+			}
+		}
+		public static void ShowOrActivateWindow(FrameworkElement view, IDialogParameters parameters = null, Action<IDialogResult> callback = null)
+		{
+			if (ExistsWindow(view))
+			{
+				ActivateWindow(view);
+			}
+			else
+			{
+				Show(view, parameters, callback);
+			}
+		}
 		/// <summary>非模态弹出</summary>
 		public static void Show(FrameworkElement view,
 								IDialogParameters parameters = null,