[编程交流] ObjectARX:。净：DwgVersion en

    if fs.Read(data, 0, 6) = 6 then
     match (new System.Text.ASCIIEncoding()).GetString data with
     | StartsWith "MC0.0" -> "R1.0"
     | StartsWith "AC1.2" -> "R1.2"
     | StartsWith "AC1.40" -> "R1.4"
     | StartsWith "AC1.50" -> "R2.05"
     | StartsWith "AC2.10" -> "R2.10"
     | StartsWith "AC2.21" -> "R2.21"
     | StartsWith "AC2.22" -> "R2.22"
     | StartsWith "AC1001" -> "R2.22"
     | StartsWith "AC1002" -> "R2.5"
     | StartsWith "AC1003" -> "R2.6"
     | StartsWith "AC1004" -> "R9"
     | StartsWith "AC1006" -> "R10"
     | StartsWith "AC1009" -> "R11"
     | StartsWith "AC1012" -> "R13"
     | StartsWith "AC1014" -> "R14"
     | StartsWith "AC1015" -> "2000"
     | StartsWith "AC1018" -> "2004"
     | StartsWith "AC1021" -> "2007"
     | StartsWith "AC1024" -> "2010"
     | _ -> "Unknown"
   else ""