fix analyzers (#2461)

* fix analyzer issues

* fixes

BASE/src/Microsoft.ApplicationInsights/Channel/Transmission.cs

@@ -23,19 +23,11 @@ public class Transmission
         internal const string ContentEncodingHeader = "Content-Encoding";
 
         private static readonly TimeSpan DefaultTimeout = TimeSpan.FromSeconds(100);
-        private static HttpClient client;
+        private static HttpClient client = new HttpClient(new RedirectHttpHandler()) { Timeout = System.Threading.Timeout.InfiniteTimeSpan };
         private static long flushAsyncCounter = 0;
 
         private int isSending;
 
-        static Transmission()
-        {
-            client = new HttpClient(new RedirectHttpHandler())
-            { 
-                Timeout = System.Threading.Timeout.InfiniteTimeSpan,
-            };
-        }
-
         /// <summary>
         /// Initializes a new instance of the <see cref="Transmission"/> class.
         /// </summary>

BASE/src/Microsoft.ApplicationInsights/Extensibility/Implementation/Authentication/ReflectionCredentialEnvelope.cs

@@ -123,7 +123,7 @@ private static Type GetTokenCredentialType()
 
             if (typeTokenCredential == null)
             {
-                if (AppDomain.CurrentDomain.GetAssemblies().Any(x => x.FullName.StartsWith(azureCoreAssemblyName)))
+                if (AppDomain.CurrentDomain.GetAssemblies().Any(x => x.FullName.StartsWith(azureCoreAssemblyName, StringComparison.Ordinal)))
                 {
                     throw new Exception("An unknown error has occurred. Failed to get type Azure.Core.TokenCredential. Detected that Azure.Core is loaded in AppDomain.CurrentDomain.");
                 }

BASE/src/ServerTelemetryChannel/Implementation/TransmissionPolicy/TransmissionPolicyCollection.cs

@@ -9,6 +9,8 @@ internal class TransmissionPolicyCollection : IDisposable
     {
         private readonly IEnumerable<TransmissionPolicy> policies;
         private bool isDisposed;
+
+        [SuppressMessage("Usage", "CA2213:Disposable fields should be disposed", Justification = "All policies are stored in the IEnumerable and are properly disposed.")]
         private AuthenticationTransmissionPolicy authenticationTransmissionPolicy;
 
         [SuppressMessage("Microsoft.Usage", "CA1801:ReviewUnusedParameters", Justification = "applicationLifecycle is required only for NetFramework.")]

BASE/src/ServerTelemetryChannel/ServerTelemetryChannel.cs

@@ -283,6 +283,7 @@ public void Dispose()
             // Tested by FxCop rule CA2213
             this.TelemetryBuffer.Dispose();
             this.Transmitter.Dispose();
+            this.policies.Dispose();
         }
 
         /// <summary>

WEB/Src/DependencyCollector/DependencyCollector/DependencyTrackingTelemetryModule.cs

@@ -282,7 +282,7 @@ protected virtual void Dispose(bool disposing)
         [MethodImpl(MethodImplOptions.NoOptimization | MethodImplOptions.NoInlining)]
         private static void PrepareFirstActivity()
         {
-            var activity = new Activity("Microsoft.ApplicationInsights.Init");
+            using var activity = new Activity("Microsoft.ApplicationInsights.Init");
             activity.Start();
             activity.Stop();
         }