How to get variable attribute values?

Question

My goal is to get class properties attribute and it's values.

For example, if I have an attribute 'Bindable' to check if property is bindable:

public class Bindable : Attribute
{
    public bool IsBindable { get; set; }
}

And I have a Person class:

public class Person
{
    [Bindable(IsBindable = true)]
    public string FirstName { get; set; }

    [Bindable(IsBindable = false)]
    public string LastName { get; set; } 
}

How can I get FirstName's and LastName's 'Bindable' attribute values?

    public void Bind()
    {
        Person p = new Person();

        if (FirstName property is Bindable)
            p.FirstName = "";
        if (LastName property is Bindable)
            p.LastName = "";
    }

Thanks.

Jon Skeet · Accepted Answer · 2011-08-16 14:13:53Z

9

Instances don't have separate attributes - you have to ask the type for its members (e.g. with Type.GetProperties), and ask those members for their attributes (e.g. PropertyInfo.GetCustomAttributes).

EDIT: As per comments, there's a tutorial on MSDN about attributes.

edited Aug 16, 2011 at 14:13

answered Aug 16, 2011 at 14:04

Jon Skeet

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5 Comments

Chris Shouts Over a year ago

There's a nice Attributes Tutorial that covers this on MSDN.

Prashant Pimpale Over a year ago

@JonSkeet I have one variable called string key and in that value is profile_image, so can I get the value of the key and set it as attribute dynamically?

Prashant Pimpale Over a year ago

beacuse my method need a value like attribute=value

Jon Skeet Over a year ago

@PrashantPimpale: It's not really clear what you're trying to do, I'm afraid. It's probably worth asking in a new question.

Prashant Pimpale Over a year ago

@JonSkeet Here is a described question stackoverflow.com/q/53046664/7124761

gandarez · Accepted Answer · 2011-08-16 14:26:35Z

You can try by this way:

     public class Bindable : Attribute
        {
            public bool IsBindable { get; set; }
        }

        public class Person
        {
            [Bindable(IsBindable = true)]
            public string FirstName { get; set; }

            [Bindable(IsBindable = false)]
            public string LastName { get; set; }
        }

        public class Test
        {
            public void Bind()
            {
                Person p = new Person();

                foreach (PropertyInfo property in p.GetType().GetProperties())
                {

                   try
                   {
                       Bindable _Attribute = (Bindable)property.GetCustomAttributes(typeof(Bindable), false).First();

                       if (_Attribute.IsBindable)
                       {
                            //TODO
                       }
                    }
                    catch (Exception) { }
                }
            }
        }

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