Detect access modifier type on a property using Reflection

Since properties are just syntactic sugar over a pair of get/set methods, there's no such thing as "accessibility" of a property reflection-wise. Rather, you'll have to find out accessibility levels of get and set methods separately. To that end, retrieve appropriate MethodInfo objects with GetGetMethod and GetSetMethod methods, and from there are various IsPrivate, IsPublic and other methods and properties.

You need to look at the methodInfo of each get & set method eg :

PropertyInfo pi = ...;
bool isPublic = pi.GetGetMethod(true).IsPublic;
bool isProtected= pi.GetGetMethod(true).IsFamily;

It seems to be the IsFamily property that indicates if a method is protected..