CODEWITHSUNDEEP
c#reflectionattributescustom-attributes
Ehsan
Ehsan

Reputation: 3491

How select some of property of a Class by custom attribute

I have a class by 3 property.

class Issuance
{
    [MyAttr]
    virtual public long Code1 { get; set; }

    [MyAttr]
    virtual public long Code2 { get; set; }

    virtual public long Code3 { get; set; }
}

I need to select some of properties in this class by my custom attribute([MyAttr]).

I use of GetProperties() But this return all properties.

var myList = new Issuance().GetType().GetProperties();
//Count of result is 3 (Code1,Code2,Code3) But count of expected is 2(Code1,Code2)

How can I do it?

Upvotes: 1

Views: 1747

Answers (2)

Charleh
Charleh

Reputation: 14012

http://msdn.microsoft.com/en-us/library/system.reflection.propertyinfo.getcustomattributes.aspx

Try this - basically do a foreach on the properties and see if you get back your attribute type for each property. If you do, that property has the attribute:

e.g.

foreach(var propInfo in new Issuance().GetType().GetProperties()) 
{
    var attrs = propInfo.GetCustomAttributes(typeof(MyAttr), true/false); // Check docs for last param

    if(attrs.Count > 0)
      // this is one, do something
}

Upvotes: 0

Jon Skeet
Jon Skeet

Reputation: 1499760

Just use LINQ and a Where clause using MemberInfo.IsDefined:

var myList = typeof(Issuance).GetProperties()
                             .Where(p => p.IsDefined(typeof(MyAttr), false);

Upvotes: 8

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