zhao：优化

Common/system/BlackboardNew.cs

                         undoOrRedo += 1;
                         m_canvas.Strokes.Clear();
                     }
-                    StrokeCollection strokes = new StrokeCollection();
+                    //StrokeCollection strokes = new StrokeCollection();
                     StylusPointCollection stylusPoints = new StylusPointCollection();
-                    System.Windows.Input.StylusPointDescription stylusPointDescription = new StylusPointDescription();
+                    //System.Windows.Input.StylusPointDescription stylusPointDescription = new StylusPointDescription();
                     StylusPoint stylusPoint = new StylusPoint
                     {
                         X = 580,

Common/system/FileToolsCommon.cs

                     File.Delete(filePath);
                 }
             }
-            catch (Exception ex)
+            catch (Exception)
             {
 
             }

Common/system/ImageHelper.cs

                             bit.Dispose();
                         }))).Start();
                     }
-                    catch (Exception ex)
+                    catch (Exception)
                     {
 
                     }

XHWK.WKTool/App.cs

                         Directory.Delete(AppDomain.CurrentDomain.BaseDirectory + "temp",true);
                     }
                 }
-                catch (Exception ex)
+                catch (Exception)
                 {
                 }
 

XHWK.WKTool/ScreenRecordingToolbarWindow.xaml.cs

             }
             else
             {
-                string time = GetTimeStamp();
+                //string time = GetTimeStamp();
                 string tempPath = AppDomain.CurrentDomain.BaseDirectory + "temp\\";
                 if (!Directory.Exists(tempPath))
                 {

XHWK.WKTool/XHMicroLessonSystemWindow.xaml.cs

         /// 笔迹粗细
         /// </summary>
         private int PenSize = 2;
-        private DispatcherTimer t = null;
+        //private DispatcherTimer t = null;
         /// <summary>
         /// 计时器状态
         /// </summary>
             mouseDown = true;
         }
 
-        private void Button_Click(object sender, RoutedEventArgs e)
-        {
-            System.Drawing.Size a = PrimaryScreen.DESKTOP;
-            System.Drawing.Size b = PrimaryScreen.WorkingArea;
-            int c = PrimaryScreen.DpiX;
-            int d = PrimaryScreen.DpiY;
-            float x = PrimaryScreen.ScaleX;
-            float y = PrimaryScreen.ScaleY;
-        }
         /// <summary>
         /// 点击标题栏 隐藏截图的四个点和线
         /// </summary>