add host and port overload for new channel

src/csharp/Grpc.Core.Tests/ClientServerTest.cs

@@ -86,7 +86,7 @@ namespace Grpc.Core.Tests
             server.AddServiceDefinition(ServiceDefinition);
             int port = server.AddListeningPort(Host, Server.PickUnusedPort);
             server.Start();
-            channel = new Channel(Host + ":" + port);
+            channel = new Channel(Host, port);
         }
 
         [TearDown]

src/csharp/Grpc.Core/Channel.cs

@@ -45,9 +45,13 @@ namespace Grpc.Core
         readonly string target;
 
         /// <summary>
-        /// Creates a channel.
+        /// Creates a channel that connects to a specific host.
+        /// Port will default to 80 for an unsecure channel and to 443 a secure channel.
         /// </summary>
-        public Channel(string target, Credentials credentials = null, ChannelArgs channelArgs = null)
+        /// <param name="host">The DNS name of IP address of the host.</param>
+        /// <param name="credentials">Optional credentials to create a secure channel.</param>
+        /// <param name="channelArgs">Optional channel arguments.</param>
+        public Channel(string host, Credentials credentials = null, ChannelArgs channelArgs = null)
         {
             using (ChannelArgsSafeHandle nativeChannelArgs = CreateNativeChannelArgs(channelArgs))
             {
@@ -55,23 +59,27 @@ namespace Grpc.Core
                 {
                     using (CredentialsSafeHandle nativeCredentials = credentials.ToNativeCredentials())
                     {
-                        this.handle = ChannelSafeHandle.CreateSecure(nativeCredentials, target, nativeChannelArgs);
+                        this.handle = ChannelSafeHandle.CreateSecure(nativeCredentials, host, nativeChannelArgs);
                     }
                 }
                 else
                 {
-                    this.handle = ChannelSafeHandle.Create(target, nativeChannelArgs);
+                    this.handle = ChannelSafeHandle.Create(host, nativeChannelArgs);
                 }
             }
-            this.target = GetOverridenTarget(target, channelArgs);
+            this.target = GetOverridenTarget(host, channelArgs);
         }
 
-        public string Target
-        {
-            get
+        /// <summary>
+        /// Creates a channel that connects to a specific host and port.
+        /// </summary>
+        /// <param name="host">DNS name or IP address</param>
+        /// <param name="port">the port</param>
+        /// <param name="credentials">Optional credentials to create a secure channel.</param>
+        /// <param name="channelArgs">Optional channel arguments.</param>
+        public Channel(string host, int port, Credentials credentials = null, ChannelArgs channelArgs = null) :
+            this(string.Format("{0}:{1}", host, port), credentials, channelArgs)
         {
-                return this.target;
-            }
         }
 
         public void Dispose()
@@ -80,6 +88,14 @@ namespace Grpc.Core
             GC.SuppressFinalize(this);
         }
 
+        internal string Target
+        {
+            get
+            {
+                return target;
+            }
+        }
+
         internal ChannelSafeHandle Handle
         {
             get

src/csharp/Grpc.Core/Server.cs

@@ -108,7 +108,7 @@ namespace Grpc.Core
         /// </summary>
         /// <returns>The port on which server will be listening.</returns>
         /// <param name="host">the host</param>
-        /// <param name="port">the port. If zero, , an unused port is chosen automatically.</param>
+        /// <param name="port">the port. If zero, an unused port is chosen automatically.</param>
         public int AddListeningPort(string host, int port, ServerCredentials credentials)
         {
             Preconditions.CheckNotNull(credentials);

src/csharp/Grpc.Examples.MathClient/MathClient.cs

@@ -41,7 +41,7 @@ namespace math
         {
             GrpcEnvironment.Initialize();
 
-            using (Channel channel = new Channel("127.0.0.1:23456"))
+            using (Channel channel = new Channel("127.0.0.1", 23456))
             {
                 Math.IMathClient stub = new Math.MathClient(channel);
                 MathExamples.DivExample(stub);

src/csharp/Grpc.Examples.Tests/MathClientServerTests.cs

@@ -60,7 +60,7 @@ namespace math.Tests
             server.AddServiceDefinition(Math.BindService(new MathServiceImpl()));
             int port = server.AddListeningPort(host, Server.PickUnusedPort);
             server.Start();
-            channel = new Channel(host + ":" + port);
+            channel = new Channel(host, port);
 
             // TODO(jtattermusch): get rid of the custom header here once we have dedicated tests
             // for header support.

src/csharp/Grpc.IntegrationTesting/InteropClient.cs

@@ -104,8 +104,6 @@ namespace Grpc.IntegrationTesting
         {
             GrpcEnvironment.Initialize();
 
-            string addr = string.Format("{0}:{1}", options.serverHost, options.serverPort);
-
             Credentials credentials = null;
             if (options.useTls)
             {
@@ -119,7 +117,7 @@ namespace Grpc.IntegrationTesting
                     .AddString(ChannelArgs.SslTargetNameOverrideKey, options.serverHostOverride).Build();
             }
 
-            using (Channel channel = new Channel(addr, credentials, channelArgs))
+            using (Channel channel = new Channel(options.serverHost, options.serverPort.Value, credentials, channelArgs))
             {
                 var stubConfig = StubConfiguration.Default;
                 if (options.testCase == "service_account_creds" || options.testCase == "compute_engine_creds")

src/csharp/Grpc.IntegrationTesting/InteropClientServerTest.cs

@@ -65,7 +65,7 @@ namespace Grpc.IntegrationTesting
             var channelArgs = ChannelArgs.CreateBuilder()
                 .AddString(ChannelArgs.SslTargetNameOverrideKey, TestCredentials.DefaultHostOverride).Build();
 
-            channel = new Channel(host + ":" + port, TestCredentials.CreateTestClientCredentials(true), channelArgs);
+            channel = new Channel(host, port, TestCredentials.CreateTestClientCredentials(true), channelArgs);
             client = TestService.NewStub(channel);
         }