Introduction
Yesterday, I was playing with finding all UpdatePanel
controls on page while generating response in ASP.NET. Since object with this information is private
itself and collection of panels is private
in that object, I had to write some code to extract that data. I ended up with two extension methods for Object
type, for getting private
field and private
property. It's pretty straightforward, besides one thing: since member is private
. And we don't know in which type exactly (every type in base/descendent hierarchy has its own private
members), we have to search them all.
So this is the final code:
public static class ObjectExtensions
{
public static TRet GetNonPublicField<TRet>(this object o, string fieldName)
{
var bindingFlags = BindingFlags.NonPublic |
BindingFlags.Instance | BindingFlags.GetField;
return (TRet)IterateTypesForMember(o, fieldName, bindingFlags);
}
public static TRet GetNonPublicProperty<TRet>
(this object o, string propertyName)
{
var bindingFlags = BindingFlags.NonPublic |
BindingFlags.Instance | BindingFlags.GetProperty;
return (TRet)IterateTypesForMember(o, propertyName, bindingFlags);
}
private static object IterateTypesForMember
(object o, string memberName, BindingFlags bindingFlags)
{
Type type = o.GetType();
MemberInfo[] memberInfo;
do
{
memberInfo = type.GetMember(memberName, bindingFlags);
if (memberInfo.Length == 0)
{
type = type.BaseType;
}
} while (memberInfo.Length == 0 && type != null);
var member = type.InvokeMember(memberName, bindingFlags, null, o, null);
return member;
}
}