Get Custom\Visibility1 property from Polyline (LWPOLYLINE)

[lihang_wen]

I have a DWG drawing, and there are lots of polylines. I want to get the polylines of a certain layer, and then group them by the Custom \ Visibility1  property ( which is actually the diameter). 

However, when I get the polyline entity of that layer, I can't get that Visibility1 property.   I tried to get the XData, but it is null.

ResultBuffer rb = polyline.XData;

if (rb != null) //  it's always null

{...

}

I'm open to get them using C# or LISP. 

Thanks. 

 

[Norman_Yuan]

Look at the picture you posted: the "Custom" properties in the Properties Window is for BLOCKREFERENCE (dynamic block reference, in this case), not a Polyline!

[lihang_wen]

Good point. But I tried the same thing to get XData from a BlockReference, and it's still null. 

[_gile · Accepted solution]

Hi,

The dynamic properties of a 'dynamic bloc" are not stored in xdata. they are stored in the DynamicBlockReferencePropertyCollection of the block reference. You have to iterate through this collection to get the DynamicBlockReferenceProperty which name is "Visibility1" and get its Value.

foreach (DynamicBlockReferenceProperty property in br.DynamicBlockReferencePropertyCollection)
{
    if (property.PropertyName == "Visibility1")
    {
        string visibility = (string)property.Value;
        // do your stuff...
    }
}

[lihang_wen]

I used this method and it worked. 

Thanks a lot.