XML to Dictionary

Hi, I have an object.InnerXml that returns an XML that I would like to transform in a Dictionary, does anyone has an idea how to do it please?

object.InnerXml
<GetAllSiteCollResponse xmlns=\"http://tempuri.org/\"><GetAllSiteCollResult xmlns:a=\"http://schemas.microsoft.com/2003/10/Serialization/Arrays\" xmlns:i=\"http://www.w3.org/2001/XMLSchema-instance\"><a:KeyValueOfstringstring><a:Key>/sites/AtOs</a:Key><a:Value>Atos</a:Value></a:KeyValueOfstringstring></GetAllSiteCollResult></GetAllSiteCollResponse>