Minor code tweaks

Author: Sergio0694

Microsoft.Toolkit.Mvvm/ComponentModel/ObservableObject.cs

@@ -340,7 +340,7 @@ protected bool SetPropertyAndNotifyOnCompletion(ref TaskNotifier? taskNotifier,
             // instance. This will result in no further allocations after the first time this method is called for a given
             // generic type. We only pay the cost of the virtual call to the delegate, but this is not performance critical
             // code and that overhead would still be much lower than the rest of the method anyway, so that's fine.
-            return SetPropertyAndNotifyOnCompletion(taskNotifier ??= new(), newValue, _ => { }, propertyName);
+            return SetPropertyAndNotifyOnCompletion(taskNotifier ??= new(), newValue, static _ => { }, propertyName);
         }
 
         /// <summary>
@@ -401,7 +401,7 @@ protected bool SetPropertyAndNotifyOnCompletion(ref TaskNotifier? taskNotifier,
         /// </remarks>
         protected bool SetPropertyAndNotifyOnCompletion<T>(ref TaskNotifier<T>? taskNotifier, Task<T>? newValue, [CallerMemberName] string? propertyName = null)
         {
-            return SetPropertyAndNotifyOnCompletion(taskNotifier ??= new(), newValue, _ => { }, propertyName);
+            return SetPropertyAndNotifyOnCompletion(taskNotifier ??= new(), newValue, static _ => { }, propertyName);
         }
 
         /// <summary>

Microsoft.Toolkit.Mvvm/ComponentModel/ObservableValidator.cs

@@ -338,7 +338,7 @@ public IEnumerable<ValidationResult> GetErrors(string? propertyName)
                 [MethodImpl(MethodImplOptions.NoInlining)]
                 IEnumerable<ValidationResult> GetAllErrors()
                 {
-                    return this.errors.Values.SelectMany(errors => errors);
+                    return this.errors.Values.SelectMany(static errors => errors);
                 }
 
                 return GetAllErrors();

Microsoft.Toolkit.Mvvm/Messaging/IMessengerExtensions.cs

@@ -138,7 +138,7 @@ static Action<IMessenger, object, TToken> GetRegistrationAction(Type type, Metho
             // For more info on this, see the related issue at https://github.com/dotnet/roslyn/issues/5835.
             Action<IMessenger, object, TToken>[] registrationActions = DiscoveredRecipients<TToken>.RegistrationMethods.GetValue(
                 recipient.GetType(),
-                t => LoadRegistrationMethodsForType(t));
+                static t => LoadRegistrationMethodsForType(t));
 
             foreach (Action<IMessenger, object, TToken> registrationAction in registrationActions)
             {
@@ -157,7 +157,7 @@ static Action<IMessenger, object, TToken> GetRegistrationAction(Type type, Metho
         public static void Register<TMessage>(this IMessenger messenger, IRecipient<TMessage> recipient)
             where TMessage : class
         {
-            messenger.Register<IRecipient<TMessage>, TMessage, Unit>(recipient, default, (r, m) => r.Receive(m));
+            messenger.Register<IRecipient<TMessage>, TMessage, Unit>(recipient, default, static (r, m) => r.Receive(m));
         }
 
         /// <summary>
@@ -174,7 +174,7 @@ public static void Register<TMessage, TToken>(this IMessenger messenger, IRecipi
             where TMessage : class
             where TToken : IEquatable<TToken>
         {
-            messenger.Register<IRecipient<TMessage>, TMessage, TToken>(recipient, token, (r, m) => r.Receive(m));
+            messenger.Register<IRecipient<TMessage>, TMessage, TToken>(recipient, token, static (r, m) => r.Receive(m));
         }
 
         /// <summary>

Microsoft.Toolkit.Mvvm/Messaging/WeakReferenceMessenger.cs

@@ -87,7 +87,7 @@ public void Register<TRecipient, TMessage, TToken>(TRecipient recipient, TToken
                 mapping ??= new RecipientsTable();
 
                 // Get or create the handlers dictionary for the target recipient
-                var map = Unsafe.As<DictionarySlim<TToken, object>>(mapping.GetValue(recipient, _ => new DictionarySlim<TToken, object>()));
+                var map = Unsafe.As<DictionarySlim<TToken, object>>(mapping.GetValue(recipient, static _ => new DictionarySlim<TToken, object>()));
 
                 // Add the new registration entry
                 ref object? registeredHandler = ref map.GetOrAddValueRef(token);