check if PropertyDescriptor has attribute

Question

I'm trying to check if a property has the DataMemberAttribute applied (using TypeDescriptor)

this is what I have now:

PropertyDescriptor targetProp = targetProps[i];

var has = argetProp.Attributes.Contains(
Attribute.GetCustomAttribute(typeof(DataMemberAttribute).Assembly,typeof(DataMemberAttribute)));

the problem is that

Attribute.GetCustomAttribute(typeof(DataMemberAttribute).Assembly,typeof(DataMemberAttribute))

returns null

Probably your assembly has no DataMemberAttribute applied. You can't even apply a DataMemberAttribute to an assembly, only properties and fields are allowed. — Fox32, Jun 29 '12 at 10:24

score 31 · Accepted Answer · answered Jun 29 '12 at 10:24

31

You could use LINQ. A chain of the .OfType<T>() and .Any() extension methods would do the job just fine:

PropertyDescriptor targetProp = targetProps[i];
bool hasDataMember = targetProp.Attributes.OfType<DataMemberAttribute>().Any();

answered Jun 29 '12 at 10:24

Darin Dimitrov

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score 1 · Answer 2 · edited May 23 '17 at 10:27

1

Found a much nicer answer in there: https://stackoverflow.com/a/2051116/605586

Basically you can just use:

bool hasDataMember = Attribute.IsDefined(property, typeof(DataMemberAttribute));

edited May 23 '17 at 10:27

Community

1
1

answered Jul 08 '15 at 11:24

Thomas

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4

This won't work on a PropertyDescriptor, only on a PropertyInfo. – Nathan Phillips Sep 24 '15 at 17:15

D.L.MAN · Answer 3 · 2020-03-07T17:52:56.793

There are 3 ways:

First:

PropertyDescriptor targetProp = targetProps[i];
bool hasDataMember = targetProp.Attributes.Contains(new DataMemberAttribute());

Second:

PropertyDescriptor targetProp = targetProps[i];
bool hasDataMember = targetProp.Attributes.OfType<DataMemberAttribute>().Any();

Third:

PropertyDescriptor targetProp = targetProps[i];
bool hasDataMember = targetProp.Attributes.Matches(new DataMemberAttribute());

Best Regard!

check if PropertyDescriptor has attribute

3 Answers3