C# Given a custom class and custom attribute how can you find the attributes of a class from the base class

Question

Given the following class

[KeyField("dap_name")]
public class nhs_acquisition_profile
    : DALObject
    , IDisposable
{
    public nhs_acquisition_profile()
        : base()
    {
    }

    public nhs_acquisition_profile(String ConnectionString)
        : base(ConnectionString)
    {

    }


}

How could I find the value of the KeyField Attribute but from the base class.

this.GetType() is probably your friend, if I understand your scenario correctly. If not, it could do with some sample code to better illustrate your problem. — Jeroen Mostert
– Jeroen Mostert, Commented Sep 25, 2017 at 16:06
You can use relection on the DALObject type to find its inheritors and then get the custom attributes on those - but you'll still need to know which one you're looking for, though - so that might not be what you're after if for some reason you need to do this via the base type. — thisextendsthat
– thisextendsthat, Commented Sep 25, 2017 at 16:07

ASpirin · Accepted Answer · 2017-09-25 16:42:40Z

4

I suppose you need it in a construction phase

public DALObject() // base constructor
{
    var fieldAttr = GetType() // real type
        .GetCustomAttributes(typeof(KeyFieldAttribute), true) // look for attribute
        .FirstOrDefault(); // can take more than one, it's an example
    var resultField = (fieldAttr as KeyFieldAttribute)?.Field; // cast and use
}

The same code will works the same in other functions in the class

edited Sep 25, 2017 at 16:42

answered Sep 25, 2017 at 16:24

ASpirin

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