Add some comments.

Source/BSN.Commons.Orm.EntityFrameworkCore/ModelBuilderExtensions.cs

@@ -69,11 +69,23 @@ private static void MapAllReadonlyProperties<T>(Microsoft.EntityFrameworkCore.Me
             var navigations = entityType.GetNavigations().Select(n => n.Name);
             IEnumerable<PropertyInfo> properties = from property in typeof(T).GetProperties()
                                                    where property.CanWrite == false
-                                                   && property.GetCustomAttribute<NotMappedAttribute>() == null
-                                                   && property.GetMethod.GetCustomAttribute<CompilerGeneratedAttribute>() != null
+                                                   && property.GetCustomAttribute<NotMappedAttribute>() == null                                                   
+                                                   && property.GetMethod.GetCustomAttribute<CompilerGeneratedAttribute>() != null 
                                                    && !ignores.Any(ignoreProperty => ignoreProperty == property.Name)
                                                    && !navigations.Contains(property.Name)
                                                    select property;
+
+            // about following condition in above code:
+            //      && property.GetMethod.GetCustomAttribute<CompilerGeneratedAttribute>() != null
+            // getter-only properties and expression-bodied properties are looking so much similar in C#
+            //      1. public string FullName => $"{FirstName} {LastName}"
+            //      2. public string FirstName { get; }
+            // in example #1 there will be no backing-field in compilation process.
+            // but in the next example (#2) we have a compiler generated backing-field.
+            // By default EF marks a property as column if it be able to write on it. 
+            // So when we add read-only things to it, we should care about such a case.
+            // to identify expression-bodied properties we can use this attribute check on GetMethod.
+
             foreach (var property in properties)
             {
                 builder.Instance.Property(property.PropertyType, property.Name);