[Trimming][AOT] Investigate trimming and AOT warnings in dotnet new maui-blazor sample app

[simonrozsival]

This is a follow-up to #22282 and it is related to #18658

When publishing the dotnet new maui-blazor app with NativeAOT using the current net9.0 build of MAUI (a45f7021b7773b18f93800bd2d804fe56a6360ef), the ILC reports the following 26 warnings:

> dotnet new maui-blazor
> ../maui/dotnet-local.sh publish -f net9.0-maccatalyst -r maccatalyst-arm64 -p:PublishAot=true -p:PublishAotUsingRuntimePack=true -p:TrimmerSingleWarn=false
...
ILC : warning IL3000: Microsoft.AspNetCore.Components.WebView.WebViewManager.StaticWebAssetsLoader.ResolveRelativeToAssembly(): 'System.Reflection.Assembly.Location.get' always returns an empty string for assemblies embedded in a single-file app. If the path to the app directory is needed, consider calling 'System.AppContext.BaseDirectory'.
ILC : warning IL3000: Microsoft.AspNetCore.Components.WebView.WebViewManager.StaticWebAssetsLoader.ResolveRelativeToAssembly(): 'System.Reflection.Assembly.Location.get' always returns an empty string for assemblies embedded in a single-file app. If the path to the app directory is needed, consider calling 'System.AppContext.BaseDirectory'.
ILC : warning IL3000: Microsoft.AspNetCore.Components.WebView.WebViewManager.StaticWebAssetsLoader.ResolveRelativeToAssembly(): 'System.Reflection.Assembly.Location.get' always returns an empty string for assemblies embedded in a single-file app. If the path to the app directory is needed, consider calling 'System.AppContext.BaseDirectory'.
ILC : Trim analysis warning IL2067: Microsoft.AspNetCore.Components.WebView.Services.WebViewRenderer.AddRootComponent(Type,String): '' argument does not satisfy 'DynamicallyAccessedMemberTypes.All' in call to 'Microsoft.AspNetCore.Components.RenderTree.WebRenderer.AddRootComponent(Type,String)'. The parameter '#0' of method 'Microsoft.AspNetCore.Components.WebView.Services.WebViewRenderer.AddRootComponent(Type,String)' 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 : AOT analysis warning IL3050: Microsoft.AspNetCore.Components.RenderTree.WebRenderer.AttachWebRendererInterop(IJSRuntime,JsonSerializerOptions,JSComponentInterop): Using member 'System.Text.Json.JsonSerializer.Serialize<Object[]>(Object[],JsonSerializerOptions)' which has 'RequiresDynamicCodeAttribute' can break functionality when AOT compiling. JSON serialization and deserialization might require types that cannot be statically analyzed and might need runtime code generation. Use System.Text.Json source generation for native AOT applications.
ILC : AOT analysis warning IL3050: Microsoft.AspNetCore.Components.Web.Infrastructure.JSComponentInterop.SetRootComponentParameters(Int32,Int32,JsonElement,JsonSerializerOptions): Using member 'System.Text.Json.JsonSerializer.Deserialize(JsonElement,Type,JsonSerializerOptions)' which has 'RequiresDynamicCodeAttribute' can break functionality when AOT compiling. JSON serialization and deserialization might require types that cannot be statically analyzed and might need runtime code generation. Use System.Text.Json source generation for native AOT applications.
ILC : AOT analysis warning IL3050: Microsoft.AspNetCore.Components.Web.Infrastructure.JSComponentInterop.SetRootComponentParameters(Int32,Int32,JsonElement,JsonSerializerOptions): Using member 'System.Text.Json.JsonSerializer.Deserialize<IJSObjectReference>(JsonElement,JsonSerializerOptions)' which has 'RequiresDynamicCodeAttribute' can break functionality when AOT compiling. JSON serialization and deserialization might require types that cannot be statically analyzed and might need runtime code generation. Use System.Text.Json source generation for native AOT applications.
ILC : AOT analysis warning IL3050: Microsoft.AspNetCore.Components.Web.Infrastructure.JSComponentInterop.SetRootComponentParameters(Int32,Int32,JsonElement,JsonSerializerOptions): Using member 'System.Text.Json.JsonSerializer.Deserialize<IJSObjectReference>(JsonElement,JsonSerializerOptions)' which has 'RequiresDynamicCodeAttribute' can break functionality when AOT compiling. JSON serialization and deserialization might require types that cannot be statically analyzed and might need runtime code generation. Use System.Text.Json source generation for native AOT applications.
ILC : AOT analysis warning IL3050: Microsoft.JSInterop.Infrastructure.DotNetObjectReferenceJsonConverterFactory.CreateConverter(Type,JsonSerializerOptions): Using member 'System.Type.MakeGenericType(Type[])' which has 'RequiresDynamicCodeAttribute' can break functionality when AOT compiling. The native code for this instantiation might not be available at runtime.
ILC : AOT analysis warning IL3050: Microsoft.AspNetCore.Components.Web.WebEventData.ParseEventArgsJson(Renderer,JsonSerializerOptions,UInt64,String,JsonElement): Using member 'System.Text.Json.JsonSerializer.Deserialize(String,Type,JsonSerializerOptions)' which has 'RequiresDynamicCodeAttribute' can break functionality when AOT compiling. JSON serialization and deserialization might require types that cannot be statically analyzed and might need runtime code generation. Use System.Text.Json source generation for native AOT applications.
ILC : Trim analysis warning IL2072: Microsoft.AspNetCore.Components.ComponentFactory.PerformPropertyInjection(IServiceProvider,IComponent): '' argument does not satisfy 'DynamicallyAccessedMemberTypes.All' in call to 'Microsoft.AspNetCore.Components.ComponentFactory.GetComponentTypeInfo(Type)'. 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: Microsoft.AspNetCore.Components.WebView.IpcCommon.Serialize(String,Object[]): Using member 'System.Text.Json.JsonSerializer.Serialize<IEnumerable`1<Object>>(IEnumerable`1<Object>,JsonSerializerOptions)' which has 'RequiresUnreferencedCodeAttribute' can break functionality when trimming application code. JSON serialization and deserialization might require types that cannot be statically analyzed. Use the overload that takes a JsonTypeInfo or JsonSerializerContext, or make sure all of the required types are preserved.
ILC : AOT analysis warning IL3050: Microsoft.AspNetCore.Components.WebView.IpcCommon.Serialize(String,Object[]): Using member 'System.Text.Json.JsonSerializer.Serialize<IEnumerable`1<Object>>(IEnumerable`1<Object>,JsonSerializerOptions)' which has 'RequiresDynamicCodeAttribute' can break functionality when AOT compiling. JSON serialization and deserialization might require types that cannot be statically analyzed and might need runtime code generation. Use System.Text.Json source generation for native AOT applications.
ILC : Trim analysis warning IL2072: Microsoft.AspNetCore.Components.CascadingParameterState.FindCascadingParameters(ComponentState,Boolean&): '' argument does not satisfy 'DynamicallyAccessedMemberTypes.All' in call to 'Microsoft.AspNetCore.Components.CascadingParameterState.GetCascadingParameterInfos(Type)'. 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 : AOT analysis warning IL3050: Microsoft.JSInterop.Infrastructure.DotNetDispatcher.BeginInvokeDotNet(JSRuntime,DotNetInvocationInfo,String): Using member 'System.Text.Json.JsonSerializer.Serialize<Object>(Object,JsonSerializerOptions)' which has 'RequiresDynamicCodeAttribute' can break functionality when AOT compiling. JSON serialization and deserialization might require types that cannot be statically analyzed and might need runtime code generation. Use System.Text.Json source generation for native AOT applications.
ILC : Trim analysis warning IL2026: Microsoft.AspNetCore.Components.WebView.IpcCommon.TryDeserialize<T>(String,T&,ArraySegment`1<JsonElement>&): Using member 'System.Text.Json.JsonSerializer.Deserialize(ReadOnlySpan`1<Char>,Type,JsonSerializerOptions)' which has 'RequiresUnreferencedCodeAttribute' can break functionality when trimming application code. JSON serialization and deserialization might require types that cannot be statically analyzed. Use the overload that takes a JsonTypeInfo or JsonSerializerContext, or make sure all of the required types are preserved.
ILC : AOT analysis warning IL3050: Microsoft.AspNetCore.Components.WebView.IpcCommon.TryDeserialize<T>(String,T&,ArraySegment`1<JsonElement>&): Using member 'System.Text.Json.JsonSerializer.Deserialize(ReadOnlySpan`1<Char>,Type,JsonSerializerOptions)' which has 'RequiresDynamicCodeAttribute' can break functionality when AOT compiling. JSON serialization and deserialization might require types that cannot be statically analyzed and might need runtime code generation. Use System.Text.Json source generation for native AOT applications.
ILC : AOT analysis warning IL3050: Microsoft.JSInterop.JSRuntime.EndInvokeJS(Int64,Boolean,Utf8JsonReader&): Using member 'System.Text.Json.JsonSerializer.Deserialize(Utf8JsonReader&,Type,JsonSerializerOptions)' which has 'RequiresDynamicCodeAttribute' can break functionality when AOT compiling. JSON serialization and deserialization might require types that cannot be statically analyzed and might need runtime code generation. Use System.Text.Json source generation for native AOT applications.
ILC : AOT analysis warning IL3050: Microsoft.JSInterop.JSRuntime.InvokeAsync<TValue>(Int64,String,CancellationToken,Object[]): Using member 'System.Text.Json.JsonSerializer.Serialize<Object[]>(Object[],JsonSerializerOptions)' which has 'RequiresDynamicCodeAttribute' can break functionality when AOT compiling. JSON serialization and deserialization might require types that cannot be statically analyzed and might need runtime code generation. Use System.Text.Json source generation for native AOT applications.
ILC : AOT analysis warning IL3050: Microsoft.JSInterop.Infrastructure.DotNetDispatcher.EndInvokeDotNetAfterTask(Task,JSRuntime,DotNetInvocationInfo&): Using member 'System.Text.Json.JsonSerializer.Serialize<Object>(Object,JsonSerializerOptions)' which has 'RequiresDynamicCodeAttribute' can break functionality when AOT compiling. JSON serialization and deserialization might require types that cannot be statically analyzed and might need runtime code generation. Use System.Text.Json source generation for native AOT applications.
ILC : AOT analysis warning IL3050: Microsoft.JSInterop.Infrastructure.DotNetDispatcher.<>c.<GetTaskByType>b__14_0(Type,MethodInfo): Using member 'System.Reflection.MethodInfo.MakeGenericMethod(Type[])' which has 'RequiresDynamicCodeAttribute' can break functionality when AOT compiling. The native code for this instantiation might not be available at runtime.
ILC : AOT analysis warning IL3050: Microsoft.JSInterop.Infrastructure.DotNetDispatcher.ParseArguments(JSRuntime,String,String,Type[]): Using member 'System.Text.Json.JsonSerializer.Deserialize(Utf8JsonReader&,Type,JsonSerializerOptions)' which has 'RequiresDynamicCodeAttribute' can break functionality when AOT compiling. JSON serialization and deserialization might require types that cannot be statically analyzed and might need runtime code generation. Use System.Text.Json source generation for native AOT applications.
ILC : Trim analysis warning IL2111: Microsoft.JSInterop.Infrastructure.DotNetDispatcher.GetCachedMethodInfo(IDotNetObjectReference,String): Method 'Microsoft.JSInterop.Infrastructure.DotNetDispatcher.<GetCachedMethodInfo>g__ScanTypeForCallableMethods|16_0(Type)' with parameters or return value with `DynamicallyAccessedMembersAttribute` is accessed via reflection. Trimmer can't guarantee availability of the requirements of the method.
ILC : Trim analysis warning IL2065: Microsoft.JSInterop.Infrastructure.DotNetDispatcher.ScanAssemblyForCallableMethods(DotNetDispatcher.AssemblyKey): Value passed to implicit 'this' parameter of method 'System.Type.GetMethods(BindingFlags)' can not be statically determined and may not meet 'DynamicallyAccessedMembersAttribute' requirements.
ILC : AOT analysis warning IL3050: Microsoft.JSInterop.Infrastructure.TaskGenericsUtil.<>c.<GetTaskResult>b__5_0(Type): Using member 'System.Type.MakeGenericType(Type[])' which has 'RequiresDynamicCodeAttribute' can break functionality when AOT compiling. The native code for this instantiation might not be available at runtime.
ILC : AOT analysis warning IL3050: Microsoft.JSInterop.Infrastructure.TaskGenericsUtil.<>c.<CreateResultSetter>b__12_0(Type): Using member 'System.Type.MakeGenericType(Type[])' which has 'RequiresDynamicCodeAttribute' can break functionality when AOT compiling. The native code for this instantiation might not be available at runtime.
...

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