How to get the attribute value of a block reference entity(Insert)?

[865390841]

Hello，This is a nice library to handle dxf file。
And now i try to get the attribute value of a block reference entity that draw in AutoCAD 2016，but  got the empty string instead of the expected attribute value.
Part of my code is as follows:
        var attributes = block.AttributeDefinitions;
        var attValues = attributes.Values;
        var lableStr = "UnInit";
        if (attValues.Count != 0)
        {
            lableStr = attValues.ElementAt(0).Value;
        }
This is whether I use the right properties and classes，Thank you for your help。

[haplokuon]

Read this specially my last post.