Native AOT compatibility

[RikkiGibson]

It would be great to be able to use Native AOT in an game that references Myra.

When I try to publish with native AOT, while referencing Myra, the resulting app crashes on startup. I get the following warnings during publish:

    ILC : Trim analysis warning IL2057: Microsoft.Xna.Framework.Content.ContentTypeReaderManager.LoadAssetReaders(ContentReader): Unrecognized value passed to the parameter 'typeName' of method 'System.Type.GetType(String)'. It's not possible to guarantee the availability of the target type.
    ILC : Trim analysis warning IL2070: Microsoft.Xna.Framework.Content.ContentExtensions.GetDefaultConstructor(Type): 'this' argument does not satisfy 'DynamicallyAccessedMemberTypes.PublicConstructors', 'DynamicallyAccessedMemberTypes.NonPublicConstructors' in call to 'System.Type.GetConstructor(BindingFlags,Binder,Type[],ParameterModifier[])'. The parameter 'type' of method 'Microsoft.Xna.Framework.Content.ContentExtensions.GetDefaultConstructor(Type)' does not have matching annotations. The source value must declare at least the same requirements as those declared on the target location it is assigned to.
    ILC : Trim analysis warning IL2075: Myra.MML.LoadContext.Load<T>(Object,XElement,!!0): 'this' argument does not satisfy 'DynamicallyAccessedMemberTypes.PublicEvents' in call to 'System.Type.GetEvent(String)'. The return value of method 'System.Object.GetType()' does not have matching annotations. The source value must declare at least the same requirements as those declared on the target location it is assigned to.
    ILC : Trim analysis warning IL2090: Myra.MML.LoadContext.Load<T>(Object,XElement,!!0): 'this' argument does not satisfy 'DynamicallyAccessedMemberTypes.PublicMethods' in call to 'System.Type.GetMethod(String,BindingFlags)'. The generic parameter 'T' of 'Myra.MML.LoadContext.Load<T>(Object,XElement,!!0)' does not have matching annotations. The source value must declare at least the same requirements as those declared on the target location it is assigned to.
    ILC : Trim analysis warning IL2075: Myra.MML.LoadContext.Load<T>(Object,XElement,!!0): 'this' argument does not satisfy 'DynamicallyAccessedMemberTypes.PublicEvents' in call to 'System.Type.GetEvent(String)'. The return value of method 'System.Object.GetType()' does not have matching annotations. The source value must declare at least the same requirements as those declared on the target location it is assigned to.
    ILC : Trim analysis warning IL2026: Myra.MML.LoadContext.Load<T>(Object,XElement,!!0): Using member 'System.Reflection.Assembly.GetType(String)' which has 'RequiresUnreferencedCodeAttribute' can break functionality when trimming application code. Types might be removed by trimming. If the type name is a string literal, consider using Type.GetType instead.
    ILC : Trim analysis warning IL2067: Myra.MML.BaseContext.ParseProperties(Type,Boolean,List`1<PropertyInfo>&,List`1<PropertyInfo>&): 'type' argument does not satisfy 'DynamicallyAccessedMemberTypes.PublicProperties', 'DynamicallyAccessedMemberTypes.NonPublicProperties' in call to 'System.Reflection.RuntimeReflectionExtensions.GetRuntimeProperties(Type)'. The parameter 'type' of method 'Myra.MML.BaseContext.ParseProperties(Type,Boolean,List`1<PropertyInfo>&,List`1<PropertyInfo>&)' does not have matching annotations. The source value must declare at least the same requirements as those declared on the target location it is assigned to.
    ILC : Trim analysis warning IL2026: Myra.Graphics2D.UI.Project.GetWidgetTypeByName(String): Using member 'System.Reflection.Assembly.GetType(String)' which has 'RequiresUnreferencedCodeAttribute' can break functionality when trimming application code. Types might be removed by trimming. If the type name is a string literal, consider using Type.GetType instead.
    ILC : Trim analysis warning IL2059: Myra.MML.AttachedPropertiesRegistry.GetPropertiesOfType(Type): Unrecognized value passed to the parameter 'type' of method 'System.Runtime.CompilerServices.RuntimeHelpers.RunClassConstructor(RuntimeTypeHandle)'. It's not possible to guarantee the availability of the target static constructor.
    ILC : Trim analysis warning IL2067: Myra.MML.LoadContext.<>c.<.ctor>b__11_0(Type,XElement): 'type' argument does not satisfy 'DynamicallyAccessedMemberTypes.PublicParameterlessConstructor' in call to 'System.Activator.CreateInstance(Type)'. The parameter 'type' of method 'Myra.MML.LoadContext.<>c.<.ctor>b__11_0(Type,XElement)' does not have matching annotations. The source value must declare at least the same requirements as those declared on the target location it is assigned to.

Build succeeded with 10 warning(s) in 15.1s

[sachssoft]

Theoretically, the trimmer can be configured. While Myra is a great UI framework for MonoGame, it has several limitations and the code quality could be better. Additionally, it isn’t AOT-compatible, which can be restrictive for platforms like iOS that don’t allow JIT. That’s why I’m developing an AOT-friendly, streamlined alternative.

[RikkiGibson]

FWIW, I have since moved to Dear ImGui and have been able to successfully compile for Native AOT. There are .NET bindings which have some MonoGame oriented samples.