tui-cs · Copilot · May 25, 2026 · May 25, 2026 · May 25, 2026 · May 25, 2026
@@ -14,6 +14,10 @@
     <PackageVersion Include="Microsoft.CodeAnalysis" Version="4.14.0" />
     <PackageVersion Include="Microsoft.CodeAnalysis.Common" Version="4.14.0" />
     <PackageVersion Include="Microsoft.CodeAnalysis.CSharp" Version="5.3.0" />
+    <PackageVersion Include="Microsoft.Extensions.Configuration" Version="10.0.7" />
+    <PackageVersion Include="Microsoft.Extensions.Configuration.Binder" Version="10.0.7" />
+    <PackageVersion Include="Microsoft.Extensions.Configuration.Json" Version="10.0.7" />
+    <PackageVersion Include="Microsoft.Extensions.Options" Version="10.0.7" />
     <PackageVersion Include="Microsoft.Extensions.Logging.Abstractions" Version="10.0.7" />
     <PackageVersion Include="Microsoft.Extensions.Logging" Version="10.0.7" />
     <PackageVersion Include="Microsoft.Extensions.DependencyInjection" Version="10.0.7" />

@@ -15,13 +15,17 @@
 global using Terminal.Gui.ViewBase;
 global using Terminal.Gui.Views;
 global using Attribute = Terminal.Gui.Drawing.Attribute;
+#pragma warning disable CS0618 // Obsolete - ConfigurationManager alias still used internally during transition
 global using CM = Terminal.Gui.Configuration.ConfigurationManager;
+#pragma warning restore CS0618
 global using Color = Terminal.Gui.Drawing.Color;
 using System.Globalization;
 using System.Reflection;
 using System.Resources;
 using Terminal.Gui.Tracing;
 
+#pragma warning disable CS0618 // Obsolete - Application still uses ConfigurationPropertyAttribute/SettingsScope during transition
+
 namespace Terminal.Gui.App;
 
 /// <summary>
@@ -238,14 +242,14 @@ internal static List<CultureInfo> GetSupportedCultures ()
     [ConfigurationProperty (Scope = typeof (SettingsScope))]
     public static AppModel AppModel
     {
-        get;
+        get => ApplicationSettings.Defaults.AppModel;
         set
         {
-            AppModel oldValue = field;
-            field = value;
-            AppModelChanged?.Invoke (null, new ValueChangedEventArgs<AppModel> (oldValue, field));
+            AppModel oldValue = ApplicationSettings.Defaults.AppModel;
+            ApplicationSettings.Defaults.AppModel = value;
+            AppModelChanged?.Invoke (null, new ValueChangedEventArgs<AppModel> (oldValue, value));
         }
-    } = AppModel.FullScreen;
+    }
 
     /// <summary>
     ///     Gets or sets an override for the initial cursor position used in <see cref="AppModel.Inline"/> mode.
@@ -268,14 +272,14 @@ public static Point? ForceInlinePosition
     [ConfigurationProperty (Scope = typeof (SettingsScope))]
     public static string ForceDriver
     {
-        get;
+        get => ApplicationSettings.Defaults.ForceDriver;
         set
         {
-            string oldValue = field;
-            field = value;
-            ForceDriverChanged?.Invoke (null, new ValueChangedEventArgs<string> (oldValue, field));
+            string oldValue = ApplicationSettings.Defaults.ForceDriver;
+            ApplicationSettings.Defaults.ForceDriver = value;
+            ForceDriverChanged?.Invoke (null, new ValueChangedEventArgs<string> (oldValue, value));
         }
-    } = string.Empty;
+    }
 
     /// <summary>
     ///     Gets or sets the default key bindings for Application-level commands, optionally varying by platform.

@@ -2,6 +2,8 @@
 using Wcwidth;
 using Trace = Terminal.Gui.Tracing.Trace;
 
+#pragma warning disable CS0618 // Obsolete - ConfigurationManager still used internally during transition
+
 namespace Terminal.Gui.App;
 
 internal partial class ApplicationImpl

@@ -9,12 +9,12 @@ public static partial class Application // Mouse handling
     [Obsolete ("The legacy static Application object is going away.")]
     public static bool IsMouseDisabled
     {
-        get;
+        get => ApplicationSettings.Defaults.IsMouseDisabled;
         set
         {
-            bool oldValue = field;
-            field = value;
-            IsMouseDisabledChanged?.Invoke (null, new ValueChangedEventArgs<bool> (oldValue, field));
+            bool oldValue = ApplicationSettings.Defaults.IsMouseDisabled;
+            ApplicationSettings.Defaults.IsMouseDisabled = value;
+            IsMouseDisabledChanged?.Invoke (null, new ValueChangedEventArgs<bool> (oldValue, value));
         }
     }
 

@@ -39,9 +39,10 @@ public static class Trace
     [JsonConverter (typeof (TraceCategoryJsonConverter))]
     public static TraceCategory EnabledCategories
     {
-        get => _asyncLocalEnabledCategories.Value;
+        get => TraceSettings.Defaults.EnabledCategories;
         set
         {
+            TraceSettings.Defaults.EnabledCategories = value;
             _asyncLocalEnabledCategories.Value = value;
             EnsureBackendIfEnabled ();
         }

@@ -1,5 +1,7 @@
 using System.Text.Json.Serialization;
 
+#pragma warning disable CS0618 // Obsolete - AppSettingsScope references ConfigurationPropertyAttribute in docs
+
 namespace Terminal.Gui.Configuration;
 
 /// <summary>The <see cref="Scope{T}"/> class for application-defined configuration settings.</summary>
@@ -23,6 +25,7 @@ namespace Terminal.Gui.Configuration;
 ///    },
 ///  </code>
 /// </example>
+[Obsolete ("Use Microsoft.Extensions.Configuration with TuiConfigurationBuilder instead. See TuiConfigurationBuilder docs for migration guide.")]
 [JsonConverter (typeof (ScopeJsonConverter<AppSettingsScope>))]
 public class AppSettingsScope : Scope<AppSettingsScope>
 { }
@@ -71,11 +71,11 @@ public override Attribute Read (ref Utf8JsonReader reader, Type typeToConvert, J
                 switch (propertyName?.ToLower ())
                 {
                     case "foreground":
-                        foreground = JsonSerializer.Deserialize (ref reader, ConfigurationManager.SerializerContext.Color);
+                        foreground = JsonSerializer.Deserialize (ref reader, TuiSerializerContext.Instance.Color);
 
                         break;
                     case "background":
-                        background = JsonSerializer.Deserialize (ref reader, ConfigurationManager.SerializerContext.Color);
+                        background = JsonSerializer.Deserialize (ref reader, TuiSerializerContext.Instance.Color);
 
                         break;
                     case "style":

@@ -34,7 +34,7 @@ JsonSerializerOptions options
                 {
                     string key = reader.GetString ();
                     reader.Read ();
-                    object value = JsonSerializer.Deserialize (ref reader, typeof (T), ConfigurationManager.SerializerContext);
+                    object value = JsonSerializer.Deserialize (ref reader, typeof (T), TuiSerializerContext.Instance);
 
                     if (!dictionary.TryAdd (key, (T)value))
                     {
@@ -60,7 +60,7 @@ public override void Write (Utf8JsonWriter writer, ConcurrentDictionary<string,
             writer.WriteStartObject ();
 
             writer.WritePropertyName (item.Key);
-            JsonSerializer.Serialize (writer, item.Value, typeof (T), ConfigurationManager.SerializerContext);
+            JsonSerializer.Serialize (writer, item.Value, typeof (T), TuiSerializerContext.Instance);
             writer.WriteEndObject ();
         }
 

@@ -7,6 +7,8 @@
 using System.Text.Json.Serialization;
 using Terminal.Gui.Tracing;
 
+#pragma warning disable CS0618 // Obsolete - ConfigProperty references ConfigurationManager/ConfigurationPropertyAttribute internally
+
 namespace Terminal.Gui.Configuration;
 
 /// <summary>
@@ -19,6 +21,7 @@ namespace Terminal.Gui.Configuration;
 ///     serialization, a <see cref="JsonConverter"/> must be provided using the <see cref="JsonConverterAttribute"/>
 ///     attribute.
 /// </remarks>
+[Obsolete ("Being replaced by Microsoft.Extensions.Configuration. Will be removed in a future version.")]
 public class ConfigProperty
 {
     /// <summary>Describes the property.</summary>

@@ -1,6 +1,8 @@
 using System.Diagnostics.CodeAnalysis;
 using Terminal.Gui.Tracing;
 
+#pragma warning disable CS0618 // Obsolete - ConfigPropertyHostTypes references ConfigurationPropertyAttribute during transition
+
 namespace Terminal.Gui.Configuration;
 
 /// <summary>
@@ -26,6 +28,7 @@ namespace Terminal.Gui.Configuration;
 ///         consumer apps.
 ///     </para>
 /// </remarks>
+[Obsolete ("Being replaced by Microsoft.Extensions.Configuration. Will be removed in a future version.")]
 internal static class ConfigPropertyHostTypes
 {
     private const DynamicallyAccessedMemberTypes PRESERVED_MEMBERS = DynamicallyAccessedMemberTypes.PublicProperties;

@@ -8,6 +8,8 @@
 using System.Text.Json.Serialization;
 using Trace = Terminal.Gui.Tracing.Trace;
 
+#pragma warning disable CS0618 // Obsolete - ConfigurationManager uses ConfigProperty/SettingsScope/ThemeScope internally
+
 namespace Terminal.Gui.Configuration;
 
 /// <summary>
@@ -46,6 +48,7 @@ namespace Terminal.Gui.Configuration;
 ///         See the UICatalog example for a complete example of how to use ConfigurationManager.
 ///     </para>
 /// </summary>
+[Obsolete ("ConfigurationManager is being replaced by Microsoft.Extensions.Configuration. Use TuiConfigurationBuilder instead. Will be removed in a future version.")]
 public static class ConfigurationManager
 {
     private static readonly Lock _appNameLock = new ();
@@ -714,28 +717,7 @@ private static void OnApplied ()
     // `Sources` - A source is a location where a configuration can be stored. Sources are defined in the `ConfigLocations` enum.
 
     [SuppressMessage ("Style", "IDE1006:Naming Styles", Justification = "<Pending>")]
-    internal static readonly SourceGenerationContext SerializerContext = new (new JsonSerializerOptions
-    {
-        // Be relaxed
-        ReadCommentHandling = JsonCommentHandling.Skip,
-        PropertyNameCaseInsensitive = true,
-        DefaultIgnoreCondition = JsonIgnoreCondition.WhenWritingNull,
-        WriteIndented = true,
-        AllowTrailingCommas = true,
-        Converters =
-        {
-            // We override the standard Rune converter to support specifying Glyphs in
-            // a flexible way
-            new RuneJsonConverter (),
-
-            // Override Key to support "Ctrl+Q" format.
-            new KeyJsonConverter ()
-        },
-
-        // Enables Key to be "Ctrl+Q" vs "Ctrl\u002BQ"
-        Encoder = JavaScriptEncoder.UnsafeRelaxedJsonEscaping,
-        TypeInfoResolver = SourceGenerationContext.Default
-    });
+    internal static readonly SourceGenerationContext SerializerContext = TuiSerializerContext.Instance;
 
     private static SourcesManager? _sourcesManager = new ();
     private static readonly object _sourcesManagerLock = new ();

@@ -5,6 +5,7 @@
 ///     [ConfigurationProperty(Scope = typeof(AppSettingsScope))] public static string? MyProperty { get; set; } = "MyValue";
 /// </example>
 [AttributeUsage (AttributeTargets.Property)]
+[Obsolete ("Use Settings POCOs with TuiConfigurationBuilder instead. Will be removed in a future version.")]
 public class ConfigurationPropertyAttribute : System.Attribute
 {
     /// <summary>

@@ -171,7 +171,7 @@ private static object CreateInstance (Type type)
             // In AOT, try using the JsonSerializer if available
             if (IsAotEnvironment ())
             {
-                JsonTypeInfo? jsonTypeInfo = ConfigurationManager.SerializerContext.GetTypeInfo (type);
+                JsonTypeInfo? jsonTypeInfo = TuiSerializerContext.Instance.GetTypeInfo (type);
 
                 if (jsonTypeInfo is not null)
                 {
@@ -390,30 +390,43 @@ private static IDictionary CreateDictionaryInstance (Type dictType, object? comp
             return new Dictionary<string, Scheme?> ();
         }
 
+        if (dictType == typeof (Dictionary<Command, PlatformKeyBinding>))
+        {
+            return new Dictionary<Command, PlatformKeyBinding> ();
+        }
+
+        if (dictType == typeof (Dictionary<string, Dictionary<Command, PlatformKeyBinding>>))
+        {
+            if (comparer is IEqualityComparer<string> stringComparer)
+            {
+                return new Dictionary<string, Dictionary<Command, PlatformKeyBinding>> (stringComparer);
+            }
+
+            return new Dictionary<string, Dictionary<Command, PlatformKeyBinding>> ();
+        }
+
         // AOT-safe: use the source-generated JSON serializer to create empty dictionary instances.
         // This avoids Activator.CreateInstance, whose target constructors are trimmed by the AOT linker
         // for closed generic dictionary types not otherwise statically reachable.
-        // Only used when no comparer is needed — Deserialize("{}") always creates a default-comparer instance.
-        if (comparer is null)
+        // Always attempted regardless of comparer — in AOT, a default-comparer dictionary is preferable
+        // to a crash from a trimmed constructor.
+        try
         {
-            try
+            JsonTypeInfo? jsonTypeInfo = TuiSerializerContext.Instance.GetTypeInfo (dictType);
+
+            if (jsonTypeInfo is not null)
             {
-                JsonTypeInfo? jsonTypeInfo = ConfigurationManager.SerializerContext.GetTypeInfo (dictType);
+                IDictionary? result = JsonSerializer.Deserialize ("{}", jsonTypeInfo) as IDictionary;
 
-                if (jsonTypeInfo is not null)
+                if (result is not null)
                 {
-                    IDictionary? result = JsonSerializer.Deserialize ("{}", jsonTypeInfo) as IDictionary;
-
-                    if (result is not null)
-                    {
-                        return result;
-                    }
+                    return result;
                 }
             }
-            catch (InvalidOperationException)
-            {
-                // JSON serializer context may not be initialized — fall through to reflective construction.
-            }
+        }
+        catch (InvalidOperationException)
+        {
+            // JSON serializer context may not be initialized — fall through to reflective construction.
         }
 
         try

@@ -33,7 +33,7 @@ JsonSerializerOptions options
                 {
                     string key = reader.GetString ();
                     reader.Read ();
-                    object value = JsonSerializer.Deserialize (ref reader, typeof (T), ConfigurationManager.SerializerContext);
+                    object value = JsonSerializer.Deserialize (ref reader, typeof (T), TuiSerializerContext.Instance);
                     dictionary.Add (key, (T)value);
                 }
             }
@@ -56,7 +56,7 @@ public override void Write (Utf8JsonWriter writer, Dictionary<string, T> value,
 
             //writer.WriteString (item.Key, item.Key);
             writer.WritePropertyName (item.Key);
-            JsonSerializer.Serialize (writer, item.Value, typeof (T), ConfigurationManager.SerializerContext);
+            JsonSerializer.Serialize (writer, item.Value, typeof (T), TuiSerializerContext.Instance);
             writer.WriteEndObject ();
         }
 

@@ -34,7 +34,7 @@ public override Scheme Read (ref Utf8JsonReader reader, Type typeToConvert, Json
             reader.Read ();
 
             // Make sure attributes are marked as explicitly set when deserialized
-            object? attrObj = JsonSerializer.Deserialize (ref reader, ConfigurationManager.SerializerContext.Attribute);
+            object? attrObj = JsonSerializer.Deserialize (ref reader, TuiSerializerContext.Instance.Attribute);
 
             if (attrObj is not Attribute attribute)
             {

@@ -3,6 +3,8 @@
 using System.Diagnostics.CodeAnalysis;
 using System.Text.Json.Serialization;
 
+#pragma warning disable CS0618 // Obsolete - SchemeManager still uses ConfigurationManager/ConfigProperty/ThemeScope internally during transition
+
 namespace Terminal.Gui.Configuration;
 
 /// <summary>

@@ -2,6 +2,8 @@
 using System.Diagnostics;
 using System.Diagnostics.CodeAnalysis;
 
+#pragma warning disable CS0618 // Obsolete - Scope uses ConfigProperty/ConfigurationPropertyAttribute internally
+
 namespace Terminal.Gui.Configuration;
 
 /// <summary>