From f12f301c829ef8d5abf1836b7372e32928344e3a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Cl=C3=A9ment=20Notin?= <clement@notin.org>
Date: Wed, 25 Jul 2018 11:22:11 +0200
Subject: [PATCH] Improve error message in ListDNSCache() when using Windows
 before 8/2012

The 'MSFT_DNSClientCache' WMI class is unavailable on older Windows versions
Cf. https://msdn.microsoft.com/en-us/library/hh872334%28v=vs.85%29.aspx?f=255&MSPPError=-2147217396
---
 Seatbelt/Program.cs | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/Seatbelt/Program.cs b/Seatbelt/Program.cs
index 7f93ea5..184f25d 100755
--- a/Seatbelt/Program.cs
+++ b/Seatbelt/Program.cs
@@ -4008,15 +4008,14 @@ namespace Seatbelt
 
         public static void ListDNSCache()
         {
+            Console.WriteLine("\r\n\r\n=== DNS Cache (via WMI) ===\r\n");
+            
             // lists the local DNS cache via WMI (MSFT_DNSClientCache class)
-
             try
             {
                 ManagementObjectSearcher wmiData = new ManagementObjectSearcher(@"root\standardcimv2", "SELECT * FROM MSFT_DNSClientCache");
                 ManagementObjectCollection data = wmiData.Get();
 
-                Console.WriteLine("\r\n\r\n=== DNS Cache (via WMI) ===\r\n");
-
                 foreach (ManagementObject result in data)
                 {
                     Console.WriteLine("  Entry         : {0}", result["Entry"]);
@@ -4024,6 +4023,10 @@ namespace Seatbelt
                     Console.WriteLine("  Data          : {0}\r\n", result["Data"]);
                 }
             }
+            catch (ManagementException ex) when (ex.ErrorCode == ManagementStatus.InvalidNamespace)
+            {
+                Console.WriteLine("  [X] 'MSFT_DNSClientCache' WMI class unavailable (minimum supported versions of Windows: 8/2012)", ex.Message);
+            }
             catch (Exception ex)
             {
                 Console.WriteLine("  [X] Exception: {0}", ex.Message);