tidy the codes

src/Shared/HandyControl_Shared/Tools/Converter/Boolean2StrConverter.cs

@@ -4,7 +4,7 @@ using System.Windows.Data;
 
 namespace HandyControl.Tools.Converter
 {
-    public class Boolean2StrConverter : IValueConverter
+    public class Boolean2StringConverter : IValueConverter
     {
         public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
         {

src/Shared/HandyControl_Shared/Tools/Converter/Color2HexStrConverter.cs

@@ -5,7 +5,7 @@ using System.Windows.Media;
 
 namespace HandyControl.Tools.Converter
 {
-    public class Color2HexStrConverter : IValueConverter
+    public class Color2HexStringConverter : IValueConverter
     {
         public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
         {

src/Shared/HandyControl_Shared/Tools/Converter/Int2StrConverter.cs

@@ -4,24 +4,27 @@ using System.Windows.Data;
 
 namespace HandyControl.Tools.Converter
 {
-    public class Int2StrConverter : IValueConverter
+    public class Int2StringConverter : IValueConverter
     {
         public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
         {
-            if (value is int intValue)
+            if (value != null)
             {
-                if (parameter is string str)
+                if (int.TryParse(value.ToString(), out var intValue))
                 {
-                    var arr = str.Split(';');
-                    if (arr.Length > intValue)
+                    if (parameter is string str)
                     {
-                        return arr[intValue];
+                        var arr = str.Split(';');
+                        if (arr.Length > intValue)
+                        {
+                            return arr[intValue];
+                        }
+
+                        return intValue;
                     }
 
                     return intValue;
                 }
-
-                return intValue;
             }
 
             return value;