fix: 当过滤器是无效的正则时, 会输出大量异常日志

v2rayN/v2rayN/Views/MsgView.xaml.cs

@@ -11,6 +11,10 @@ namespace v2rayN.Views
     public partial class MsgView
     {
         private static Config _config;
+
+        private string lastMsgFilter;
+        private bool lastMsgFilterNotAvailable;
+
         public MsgView()
         {
             InitializeComponent();
@@ -28,29 +32,39 @@ namespace v2rayN.Views
 
         void DelegateAppendText(string msg)
         {
-            Dispatcher.BeginInvoke(new Action<string>(AppendText), DispatcherPriority.Send, msg);
+            Dispatcher.BeginInvoke(AppendText, DispatcherPriority.Send, msg);
         }
 
         public void AppendText(string msg)
         {
-            if (msg.Equals(Global.CommandClearMsg))
+            if (msg == Global.CommandClearMsg)
             {
                 ClearMsg();
                 return;
             }
-            if (!togAutoRefresh.IsChecked.Value)
+            if (togAutoRefresh.IsChecked == false)
             {
                 return;
             }
+            
             var MsgFilter = cmbMsgFilter.Text.TrimEx();
-            if (!Utils.IsNullOrEmpty(MsgFilter))
+            if (MsgFilter != lastMsgFilter) lastMsgFilterNotAvailable = false;
+            if (!string.IsNullOrEmpty(MsgFilter) && !lastMsgFilterNotAvailable)
             {
-                if (!Regex.IsMatch(msg, MsgFilter))
+                try
                 {
-                    return;
+                    if (!Regex.IsMatch(msg, MsgFilter)) // <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʽ<EFBFBD><CABD><EFBFBD>쳣
+                    {
+                        return;
+                    }
+                }
+                catch (Exception)
+                {
+                    lastMsgFilterNotAvailable = true;
                 }
             }
-
+            lastMsgFilter = MsgFilter;
+            
             ShowMsg(msg);
         }