C#•2y ago

Comparing types when using reflection

I'm using the reflection system, and want to check the type of an attribute (this may not be relevant here, but I wanted to give some context) I'm iterating over method custom attributes, and want to check if one of them is a specific type (MyAttribute) I thought I'd be able to do this:

foreach(var customAttr in method.CustomAttributes)
{
    if(customAttr.AttributeType is MyAttribute)

foreach(var customAttr in method.CustomAttributes)
{
    if(customAttr.AttributeType is MyAttribute)

However, it never hits this, and VSCode underlines it in yellow saying The given expression is never of the provided ('MyAttribute') type How do I check a type against another type? Google is only helping me with checking an object against a type.

6 Replies

ero•2y ago

== typeof(MyAttribute)?

HughOP•2y ago

Ah - I was thinking that typeof would take an object and return a type Thanks

ero•2y ago

that'd be GetType()

HughOP•2y ago

Thanks - good to know! A small follow-up to this one... This works if the type is exactly the same. How would I check if customAttr.AttributeType is a subclass of MyAttribute? Please ignore - I found IsAssignableFrom()

sunder.cc•2y ago

@Hugh not enterily sure what youre exactly doing but the Type class has a GetCustomAttribute method which you can use like this:

method.GetType().GetCustomAttribute<MyAttribute>();

method.GetType().GetCustomAttribute<MyAttribute>();

HughOP•2y ago

I have a base attribute and I want to find any attributes of subclasses. In the end typeof(MyAttribute).IsAssignableFrom(customAttr.AttributeType) worked for me

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Comparing types when using reflection