treat warnings as errors

src/csharp/Grpc.Auth/Grpc.Auth.csproj

@@ -19,6 +19,7 @@
     <IncludeSymbols>true</IncludeSymbols>
     <IncludeSource>true</IncludeSource>
     <GenerateDocumentationFile>true</GenerateDocumentationFile>
+    <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
   </PropertyGroup>
 
   <ItemGroup>

src/csharp/Grpc.Core.Testing/Grpc.Core.Testing.csproj

@@ -19,6 +19,7 @@
     <IncludeSymbols>true</IncludeSymbols>
     <IncludeSource>true</IncludeSource>
     <GenerateDocumentationFile>true</GenerateDocumentationFile>
+    <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
   </PropertyGroup>
 
   <ItemGroup>

src/csharp/Grpc.Core/Grpc.Core.csproj

@@ -18,6 +18,7 @@
     <IncludeSymbols>true</IncludeSymbols>
     <IncludeSource>true</IncludeSource>
     <GenerateDocumentationFile>true</GenerateDocumentationFile>
+    <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
   </PropertyGroup>
 
   <ItemGroup>

src/csharp/Grpc.Core/Internal/AuthContextSafeHandle.cs

@@ -74,7 +74,7 @@ namespace Grpc.Core.Internal
 
         private AuthProperty PtrToAuthProperty(IntPtr authPropertyPtr)
         {
-            var nativeAuthProperty = (NativeAuthProperty) Marshal.PtrToStructure(authPropertyPtr, typeof(NativeAuthProperty));
+            var nativeAuthProperty = Marshal.PtrToStructure<NativeAuthProperty>(authPropertyPtr);
             var name = Marshal.PtrToStringAnsi(nativeAuthProperty.Name);
             var valueBytes = new byte[(int) nativeAuthProperty.ValueLength];
             Marshal.Copy(nativeAuthProperty.Value, valueBytes, 0, (int)nativeAuthProperty.ValueLength);

src/csharp/Grpc.HealthCheck/Grpc.HealthCheck.csproj

@@ -18,6 +18,7 @@
     <IncludeSymbols>true</IncludeSymbols>
     <IncludeSource>true</IncludeSource>
     <GenerateDocumentationFile>true</GenerateDocumentationFile>
+    <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
   </PropertyGroup>
 
   <ItemGroup>

src/csharp/Grpc.Reflection/Grpc.Reflection.csproj

@@ -18,6 +18,7 @@
     <IncludeSymbols>true</IncludeSymbols>
     <IncludeSource>true</IncludeSource>
     <GenerateDocumentationFile>true</GenerateDocumentationFile>
+    <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
   </PropertyGroup>
 
   <ItemGroup>

src/csharp/Grpc.Reflection/ReflectionServiceImpl.cs

@@ -60,6 +60,9 @@ namespace Grpc.Reflection
         {
         }
 
+        /// <summary>
+        /// Processes a stream of server reflection requests.
+        /// </summary>
         public override async Task ServerReflectionInfo(IAsyncStreamReader<ServerReflectionRequest> requestStream, IServerStreamWriter<ServerReflectionResponse> responseStream, ServerCallContext context)
         {
             while (await requestStream.MoveNext())