diff --git a/v2rayN/v2rayN/Handler/QRCodeHelper.cs b/v2rayN/v2rayN/Common/QRCodeHelper.cs
similarity index 78%
rename from v2rayN/v2rayN/Handler/QRCodeHelper.cs
rename to v2rayN/v2rayN/Common/QRCodeHelper.cs
index 07af8856..0c4fbdb2 100644
--- a/v2rayN/v2rayN/Handler/QRCodeHelper.cs
+++ b/v2rayN/v2rayN/Common/QRCodeHelper.cs
@@ -2,15 +2,19 @@
 using QRCoder.Xaml;
 using System.Windows.Media;
 
-namespace v2rayN.Handler
+namespace v2rayN
 {
     /// <summary>
     /// 含有QR码的描述类和包装编码和渲染
     /// </summary>
     public class QRCodeHelper
     {
-        public static DrawingImage? GetQRCode(string strContent)
+        public static DrawingImage? GetQRCode(string? strContent)
         {
+            if (strContent is null)
+            {
+                return null;
+            }
             try
             {
                 QRCodeGenerator qrGenerator = new();
diff --git a/v2rayN/v2rayN/Common/UI.cs b/v2rayN/v2rayN/Common/UI.cs
index dccbeee1..226757c4 100644
--- a/v2rayN/v2rayN/Common/UI.cs
+++ b/v2rayN/v2rayN/Common/UI.cs
@@ -1,4 +1,5 @@
-using System.Windows;
+using Microsoft.Win32;
+using System.Windows;
 
 namespace v2rayN
 {
@@ -20,5 +21,24 @@ namespace v2rayN
         {
             return MessageBox.Show(msg, caption, MessageBoxButton.YesNo, MessageBoxImage.Question);
         }
+
+        public static bool? OpenFileDialog(out string fileName, string filter)
+        {
+            fileName = string.Empty;
+
+            var fileDialog = new OpenFileDialog
+            {
+                Multiselect = false,
+                Filter = filter
+            };
+
+            if (fileDialog.ShowDialog() != true)
+            {
+                return false;
+            }
+            fileName = fileDialog.FileName;
+
+            return true;
+        }
     }
 }
\ No newline at end of file
diff --git a/v2rayN/v2rayN/ViewModels/AddServer2ViewModel.cs b/v2rayN/v2rayN/ViewModels/AddServer2ViewModel.cs
index 34b3a93f..f4a5796c 100644
--- a/v2rayN/v2rayN/ViewModels/AddServer2ViewModel.cs
+++ b/v2rayN/v2rayN/ViewModels/AddServer2ViewModel.cs
@@ -1,4 +1,3 @@
-using Microsoft.Win32;
 using ReactiveUI;
 using ReactiveUI.Fody.Helpers;
 using ReactiveUI.Validation.Helpers;
@@ -104,20 +103,16 @@ namespace v2rayN.ViewModels
         {
             UI.Show(ResUI.CustomServerTips);
 
-            OpenFileDialog fileDialog = new()
-            {
-                Multiselect = false,
-                Filter = "Config|*.json|YAML|*.yaml;*.yml|All|*.*"
-            };
-            if (fileDialog.ShowDialog() != true)
+            if (UI.OpenFileDialog(out string fileName,
+                "Config|*.json|YAML|*.yaml;*.yml|All|*.*") != true)
             {
                 return;
             }
-            string fileName = fileDialog.FileName;
             if (Utils.IsNullOrEmpty(fileName))
             {
                 return;
             }
+
             var item = LazyConfig.Instance.GetProfileItem(SelectedSource.indexId);
             item ??= SelectedSource;
             item.address = fileName;
diff --git a/v2rayN/v2rayN/ViewModels/MainWindowViewModel.cs b/v2rayN/v2rayN/ViewModels/MainWindowViewModel.cs
index b4f3d234..52f581bc 100644
--- a/v2rayN/v2rayN/ViewModels/MainWindowViewModel.cs
+++ b/v2rayN/v2rayN/ViewModels/MainWindowViewModel.cs
@@ -3,7 +3,6 @@ using DynamicData.Binding;
 using MaterialDesignColors;
 using MaterialDesignColors.ColorManipulation;
 using MaterialDesignThemes.Wpf;
-using Microsoft.Win32;
 using ReactiveUI;
 using ReactiveUI.Fody.Helpers;
 using Splat;
@@ -1397,16 +1396,11 @@ namespace v2rayN.ViewModels
 
         private void ImportOldGuiConfig()
         {
-            OpenFileDialog fileDialog = new()
-            {
-                Multiselect = false,
-                Filter = "guiNConfig|*.json|All|*.*"
-            };
-            if (fileDialog.ShowDialog() != true)
+            if (UI.OpenFileDialog(out string fileName,
+                "guiNConfig|*.json|All|*.*") != true)
             {
                 return;
             }
-            string fileName = fileDialog.FileName;
             if (Utils.IsNullOrEmpty(fileName))
             {
                 return;
diff --git a/v2rayN/v2rayN/ViewModels/RoutingRuleSettingViewModel.cs b/v2rayN/v2rayN/ViewModels/RoutingRuleSettingViewModel.cs
index 0fd7a0c5..52f08ba4 100644
--- a/v2rayN/v2rayN/ViewModels/RoutingRuleSettingViewModel.cs
+++ b/v2rayN/v2rayN/ViewModels/RoutingRuleSettingViewModel.cs
@@ -1,5 +1,4 @@
 using DynamicData.Binding;
-using Microsoft.Win32;
 using ReactiveUI;
 using ReactiveUI.Fody.Helpers;
 using Splat;
@@ -264,20 +263,16 @@ namespace v2rayN.ViewModels
 
         private void ImportRulesFromFile()
         {
-            OpenFileDialog fileDialog = new OpenFileDialog
-            {
-                Multiselect = false,
-                Filter = "Rules|*.json|All|*.*"
-            };
-            if (fileDialog.ShowDialog() != true)
+            if (UI.OpenFileDialog(out string fileName,
+                "Rules|*.json|All|*.*") != true)
             {
                 return;
             }
-            string fileName = fileDialog.FileName;
             if (Utils.IsNullOrEmpty(fileName))
             {
                 return;
             }
+
             string result = Utils.LoadResource(fileName);
             if (Utils.IsNullOrEmpty(result))
             {
diff --git a/v2rayN/v2rayN/Views/OptionSettingWindow.xaml.cs b/v2rayN/v2rayN/Views/OptionSettingWindow.xaml.cs
index f431e4a0..c7f13a8c 100644
--- a/v2rayN/v2rayN/Views/OptionSettingWindow.xaml.cs
+++ b/v2rayN/v2rayN/Views/OptionSettingWindow.xaml.cs
@@ -1,5 +1,4 @@
-using Microsoft.Win32;
-using ReactiveUI;
+using ReactiveUI;
 using System.Globalization;
 using System.IO;
 using System.Reactive.Disposables;
@@ -205,13 +204,5 @@ namespace v2rayN.Views
             this.Close();
         }
 
-        private void btnBrowse_Click(object sender, System.Windows.RoutedEventArgs e)
-        {
-            var openFileDialog1 = new OpenFileDialog();
-            openFileDialog1.Filter = "tunConfig|*.json|All|*.*";
-            openFileDialog1.ShowDialog();
-
-            // txtCustomTemplate.Text = openFileDialog1.FileName;
-        }
     }
 }
\ No newline at end of file
diff --git a/v2rayN/v2rayN/Views/RoutingRuleSettingWindow.xaml.cs b/v2rayN/v2rayN/Views/RoutingRuleSettingWindow.xaml.cs
index b6ed8a8f..740231bd 100644
--- a/v2rayN/v2rayN/Views/RoutingRuleSettingWindow.xaml.cs
+++ b/v2rayN/v2rayN/Views/RoutingRuleSettingWindow.xaml.cs
@@ -1,5 +1,4 @@
-using Microsoft.Win32;
-using ReactiveUI;
+using ReactiveUI;
 using System.Reactive.Disposables;
 using System.Windows;
 using System.Windows.Input;
@@ -131,11 +130,13 @@ namespace v2rayN.Views
 
         private void btnBrowse_Click(object sender, System.Windows.RoutedEventArgs e)
         {
-            var openFileDialog1 = new OpenFileDialog();
-            openFileDialog1.Filter = "PNG,ICO|*.png;*.ico";
-            openFileDialog1.ShowDialog();
+            if (UI.OpenFileDialog(out string fileName,
+                "PNG,ICO|*.png;*.ico") != true)
+            {
+                return;
+            }
 
-            txtCustomIcon.Text = openFileDialog1.FileName;
+            txtCustomIcon.Text = fileName;
         }
     }
 }
\ No newline at end of file