Instance Is Now Created By Service Provider

This is an experimental implementation to reduce the static instance state code & instead use the service collection to handle resolving user dialogs

Controls.UserDialogs.Maui/Shared/CustomImplementationInvalidException.cs

@@ -0,0 +1,12 @@
+using System.Text;
+
+namespace Controls.UserDialogs.Maui;
+
+public class CustomImplementationInvalidException : Exception
+{
+    public CustomImplementationInvalidException()
+        : base($"Custom implementations must implement {nameof(IUserDialogs)}")
+    {
+    }
+}
+

Controls.UserDialogs.Maui/Shared/MauiAppBuilderExtension.cs

@@ -4,21 +4,10 @@ public static class MauiAppBuilderExtension
 {
     public static MauiAppBuilder UseUserDialogs(this MauiAppBuilder builder, Action configure = null)
     {
-        UserDialogs.Instance = new UserDialogsImplementation();
-
         configure?.Invoke();
 
-        return builder;
-    }
-
-    public static MauiAppBuilder UseUserDialogs(this MauiAppBuilder builder, bool registerInterface, Action configure = null)
-    {
-        UseUserDialogs(builder, configure);
-
-        if (registerInterface)
-        {
-            builder.Services.AddTransient((s) => UserDialogs.Instance);
-        }
+        builder.Services.AddSingleton(typeof(IUserDialogs), UserDialogsConfig.ImplementationType);
+        builder.Services.AddTransient<IMauiInitializeService, UserDialogsInitializeService>();
 
         return builder;
     }

Controls.UserDialogs.Maui/Shared/UserDialogs.cs

@@ -3,6 +3,7 @@
 public class UserDialogs
 {
     static IUserDialogs _currentInstance;
+
     public static IUserDialogs Instance
     {
         get
@@ -12,6 +13,6 @@ public static IUserDialogs Instance
 
             return _currentInstance;
         }
-        set => _currentInstance = value;
+        internal set => _currentInstance = value;
     }
-}
+}

Controls.UserDialogs.Maui/Shared/UserDialogsConfig.cs

@@ -0,0 +1,20 @@
+namespace Controls.UserDialogs.Maui;
+
+public class UserDialogsConfig
+{
+    private static Type _implementationType = typeof(UserDialogsImplementation);
+
+    public static Type ImplementationType
+    {
+        get => _implementationType;
+        set
+        {
+            if (!typeof(IUserDialogs).IsAssignableFrom(value))
+            {
+                throw new CustomImplementationInvalidException();
+            }
+
+            _implementationType = value;
+        }
+    }
+}

Controls.UserDialogs.Maui/Shared/UserDialogsInitializeService.cs

@@ -0,0 +1,11 @@
+namespace Controls.UserDialogs.Maui;
+
+internal class UserDialogsInitializeService : IMauiInitializeService
+{
+    public void Initialize(IServiceProvider services)
+    {
+        var userDialogs = services.GetService<IUserDialogs>();
+
+        UserDialogs.Instance = userDialogs;
+    }
+}

Sample/MauiProgram.cs

@@ -11,8 +11,10 @@ public static MauiApp CreateMauiApp()
             var builder = MauiApp.CreateBuilder();
             builder
                 .UseMauiApp<App>()
-                .UseUserDialogs(true, () =>
+                .UseUserDialogs(() =>
                 {
+                    //UserDialogsConfig.ImplementationType = typeof(YourCustomDialogImplementation);
+
 #if ANDROID
                     var fontFamily = "OpenSans-Default.ttf";
 #else