How to determine if a property is inherited or not using reflection?

  • Thread starter Thread starter Mark_google
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Mark_google

I've tried using TypeDescriptor.GetProperties to get
PropertyDescriptors and I've tried <t>.GetProperties to get
PropertyInfo but I can't figure out how to determine for a given
property whether or not the property in question is inherited from an
ancestor or not.

For that matter, I can't determine the inheritance heirarchy either
(because that would be a workaround to see if my parent has the
property defined).

TIA,
 
I've tried using TypeDescriptor.GetProperties to get
PropertyDescriptors and I've tried <t>.GetProperties to get
PropertyInfo but I can't figure out how to determine for a given
property whether or not the property in question is inherited from an
ancestor or not.
Click to expand...
Checking if .DeclaringType is the same as .ReflectedType should do the trick.
For that matter, I can't determine the inheritance heirarchy either
(because that would be a workaround to see if my parent has the
property defined).
Click to expand...
The inheritance hierarchy is actually an inheritance chain, since C# doesn't
have multiple inheritance. (Interfaces are "implemented" rather than
"inherited".) Simply following Type.BaseType will do.

Involving interfaces as well makes things trickier because .DeclaringType
will always show that a class declared the property, not an interface.
You'll have to enumerate interfaces and mappings with .GetInterfaces() and
..GetInterfaceMap() for a full picture.
 
Thanks for the reply,
Checking if .DeclaringType is the same as .ReflectedType should do the trick.
Click to expand...

I tried that and it seemed to work in most cases - except for one case
where I had a class ButtonControl that inherited an Infragistics
button control and the declaringtype and relfectedtype were my
buttoncontrol. I assumed it had to do w/ being in different
assemblies?
The inheritance hierarchy is actually an inheritance chain, since C# doesn't
have multiple inheritance. (Interfaces are "implemented" rather than
"inherited".) Simply following Type.BaseType will do.
Click to expand...

Excellent. Thank you.
You'll have to enumerate interfaces and mappings with .GetInterfaces() and
.GetInterfaceMap() for a full picture.
Click to expand...

Thankfully, I can skip that part :)
 
I tried that and it seemed to work in most cases - except for one case
where I had a class ButtonControl that inherited an Infragistics
button control and the declaringtype and relfectedtype were my
buttoncontrol. I assumed it had to do w/ being in different
assemblies?
Click to expand...

Ah - this was because I wasn't actually inheriting the property, but
overriding it... duh..
 
digger said:
I tried that and it seemed to work in most cases - except for one case
where I had a class ButtonControl that inherited an Infragistics
button control and the declaringtype and relfectedtype were my
buttoncontrol. I assumed it had to do w/ being in different
assemblies?
Click to expand...
That should not make any difference, actually (but I can't say it definitely
shouldn't, since I've never needed to do this). Could you give a minimal
example to reproduce this? Are you certain you actually implemented/overrode
the property and not accidentally declared a new one?
 
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