MainView中License到期剩余天数小于3天时，剩余天数显示为红色。

SicUI/Converter/LicenseExpiredToColorConverter.cs

@@ -0,0 +1,31 @@
+using System;
+using System.Drawing;
+using System.Globalization;
+using System.Windows.Data;
+using System.Windows.Media;
+using Brush = System.Windows.Media.Brush;
+
+namespace SicUI.Converter
+{
+    public class LicenseExpiredToColorConverter : IValueConverter
+    {
+        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            Brush foreground;
+            if (parameter is Brush brush)
+                foreground = brush;
+            else
+                foreground = new SolidColorBrush(Colors.White);
+
+            if (value is int and <= 3) 
+                foreground = new SolidColorBrush(Colors.Red);
+
+            return foreground;
+        }
+
+        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            throw new NotImplementedException();
+        }
+    }
+}

SicUI/MainView.xaml

@@ -856,6 +856,8 @@
                                 </Grid.RowDefinitions>
 
                                 <Grid.Resources>
+                                    <converter:LicenseExpiredToColorConverter x:Key="ExpiredToColorConverter"/>
+
                                     <Style x:Key="TextBlockBaseStyle" TargetType="TextBlock">
                                         <Setter Property="Foreground" Value="{DynamicResource FG_White}"/>
                                         <Setter Property="FontSize" Value="11"/>
@@ -891,6 +893,9 @@
                                 <TextBlock Grid.Row="3" Grid.Column="0" Text="Expired" Style="{StaticResource CaptionStyle}"/>
                                 <TextBlock Grid.Row="3" Grid.Column="1" d:Text="1 Days" 
                                            Text="{Binding CDKeyDaysLeft, StringFormat={}{0} Days}"
+                                           Foreground="{Binding CDKeyDaysLeft,
+                                                Converter={StaticResource ExpiredToColorConverter}, 
+                                                ConverterParameter={StaticResource FG_White}}"
                                            Style="{StaticResource ContentStyle}"/>
                             </Grid>
                         </Border>

SicUI/MainViewModel.cs

@@ -1146,7 +1146,7 @@ namespace SicUI.Client
         public string CDKeyCreationDate { get; set; }
 
         [Subscription($"System.CDKeyDaysLeft")]
-        public string CDKeyDaysLeft { get; set; }
+        public int CDKeyDaysLeft { get; set; }
 
         public string ActivateMessage { get; private set; }
 

SicUI/SicUI.csproj

@@ -246,6 +246,7 @@ if exist "$(ProjectDir)..\SicSetup\Packages\SicUI\PresetGroups" rd "$(ProjectDir
     <Compile Include="Controls\WaferAssociationUnitLite.xaml.cs">
       <DependentUpon>WaferAssociationUnitLite.xaml</DependentUpon>
     </Compile>
+    <Compile Include="Converter\LicenseExpiredToColorConverter.cs" />
     <Compile Include="GlobalUsings.cs" />
     <Compile Include="Models\Maintenances\RuntimeView.xaml.cs">
       <DependentUpon>RuntimeView.xaml</DependentUpon>