fix(Dispose): stop the senders and receivers

Mdns.sln

@@ -10,6 +10,7 @@ Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Solution Items", "Solution
 		appveyor.yml = appveyor.yml
 		.circleci\config.yml = .circleci\config.yml
 		LICENSE = LICENSE
+		mung.cmd = mung.cmd
 		README.md = README.md
 	EndProjectSection
 EndProject
@@ -21,7 +22,7 @@ Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "MdnsTests", "test\MdnsTests
 EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Spike", "Spike\Spike.csproj", "{B7019D35-A153-4143-979C-C493A74FA7EA}"
 EndProject
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Browser", "Browser\Browser.csproj", "{A77BEF8C-440E-46F7-ACFC-5EF06EFCA4BA}"
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Browser", "Browser\Browser.csproj", "{A77BEF8C-440E-46F7-ACFC-5EF06EFCA4BA}"
 EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution

mung.cmd

@@ -0,0 +1,6 @@
+dotnet build -c Release --framework netcoreapp2 ./test
+
+:Loop
+dotnet test --logger "console;verbosity=normal" -c Release --no-restore --no-build --framework netcoreapp2 ./test --filter TestCategory!=IPv6
+if %errorlevel% equ 0 goto :Loop
+echo Connection established

src/MulticastClient.cs

@@ -174,10 +174,13 @@ protected virtual void Dispose(bool disposing)
             {
                 if (disposing)
                 {
+                    MessageReceived = null;
+
                     foreach (var receiver in receivers)
                     {
                         receiver.Dispose();
                     }
+                    receivers.Clear();
 
                     foreach (var address in senders.Keys)
                     {
@@ -186,6 +189,7 @@ protected virtual void Dispose(bool disposing)
                             sender.Dispose();
                         }
                     }
+                    senders.Clear();
                 }
 
                 disposedValue = true;