Handle properties with no accessors

Cpp2IL.Core/Utils/AsmResolver/AsmResolverAssemblyPopulator.cs

@@ -278,7 +278,13 @@ public static void PopulateCustomAttributes(AssemblyAnalysisContext asmContext)
                     CopyCustomAttributes(field, field.GetExtraData<FieldDefinition>("AsmResolverField")!.CustomAttributes);
 
                 foreach (var property in type.Properties)
-                    CopyCustomAttributes(property, property.GetExtraData<PropertyDefinition>("AsmResolverProperty")!.CustomAttributes);
+                {
+                    // Property with no accessors are skipped in CopyPropertiesInType.
+                    // Skip copying custom attributes, too.
+                    var propertyDef = property.GetExtraData<PropertyDefinition>("AsmResolverProperty");
+                    if (propertyDef == null) continue;
+                    CopyCustomAttributes(property, propertyDef.CustomAttributes);
+                }
 
                 foreach (var eventDefinition in type.Events)
                     CopyCustomAttributes(eventDefinition, eventDefinition.GetExtraData<EventDefinition>("AsmResolverEvent")!.CustomAttributes);
@@ -443,6 +449,10 @@ private static void CopyPropertiesInType(ReferenceImporter importer, TypeAnalysi
     {
         foreach (var propertyCtx in typeContext.Properties)
         {
+            // Skip properties whose getter and setter were both stripped.
+            if (propertyCtx.Getter == null && propertyCtx.Setter == null)
+                continue;
+
             var propertyTypeSig = propertyCtx.ToTypeSignature(importer.TargetModule);
             var propertySignature = propertyCtx.IsStatic
                 ? PropertySignature.CreateStatic(propertyTypeSig)

LibCpp2IL/Metadata/Il2CppPropertyDefinition.cs

@@ -39,11 +39,29 @@ public Il2CppTypeDefinition? DeclaringType
 
     public Il2CppMethodDefinition? Setter => LibCpp2IlMain.TheMetadata == null || set.IsNull || DeclaringType == null ? null : LibCpp2IlMain.TheMetadata.GetMethodDefinitionFromIndex(DeclaringType.FirstMethodIdx + set);
 
-    public Il2CppTypeReflectionData? PropertyType => LibCpp2IlMain.TheMetadata == null ? null : Getter == null ? Setter!.Parameters![0].Type : Getter!.ReturnType;
+    public Il2CppTypeReflectionData? PropertyType
+    {
+        get
+        {
+            if (LibCpp2IlMain.TheMetadata == null) return null;
+            if (Getter != null) return Getter.ReturnType;
+            if (Setter != null && Setter.Parameters is { Length: > 0 }) return Setter.Parameters[^1].Type;
+            return null;
+        }
+    }
 
-    public Il2CppType? RawPropertyType => LibCpp2IlMain.TheMetadata == null ? null : Getter == null ? Setter!.Parameters![0].RawType : Getter!.RawReturnType;
+    public Il2CppType? RawPropertyType
+    {
+        get
+        {
+            if (LibCpp2IlMain.TheMetadata == null) return null;
+            if (Getter != null) return Getter.RawReturnType;
+            if (Setter != null && Setter.Parameters is { Length: > 0 }) return Setter.Parameters[^1].RawType;
+            return null;
+        }
+    }
 
-    public bool IsStatic => Getter == null ? Setter!.IsStatic : Getter!.IsStatic;
+    public bool IsStatic => Getter?.IsStatic ?? Setter?.IsStatic ?? false;
     public uint Token => token;
 
     public override void Read(ClassReadingBinaryReader reader)