How to get Link field value from Advanced Search

I have made a lookup table for a advance search filed withe the linkfield
and the Display field with 2 value as Display1 and Display2I am trying to get the linkfield value which has selected in the advance search at the Page_DataRendering
I try as
$linkfieldvalue= $this->field->AdvancedSearch->SearchValue;
var_dump($linkfieldvalue);I got the value as “Display1, Display2”
but I want to get the “linkfield” value

I assume you submit the Advanced Search form to search so that you have SearchValue, then you may try the CurrentValue of the field.