fixes for getting the samples to work

samples/Client/DaprClient/InvokeServiceGrpcExample.cs

@@ -20,21 +20,21 @@ public override async Task RunAsync(CancellationToken cancellationToken)
         {
             using var client = new DaprClientBuilder().Build();
 
-            Console.WriteLine("Invoking grpc balance");
-            var request = new GetAccountRequest() { Id = "17", };
-            var account = await client.InvokeMethodGrpcAsync<GetAccountRequest, Account>("grpcsample", "getaccount", request, cancellationToken);
-            Console.WriteLine($"Received grpc balance {account.Balance}");
-
             Console.WriteLine("Invoking grpc deposit");
-            var data = new GrpcServiceSample.Generated.Transaction() { Id = "17", Amount = 99 };
-            account = await client.InvokeMethodGrpcAsync<Transaction, Account>("grpcsample", "deposit", data, cancellationToken);
+            var deposit = new GrpcServiceSample.Generated.Transaction() { Id = "17", Amount = 99 };
+            var account = await client.InvokeMethodGrpcAsync<GrpcServiceSample.Generated.Transaction, Account>("grpcsample", "deposit", deposit, cancellationToken);
             Console.WriteLine("Returned: id:{0} | Balance:{1}", account.Id, account.Balance);
             Console.WriteLine("Completed grpc deposit");
 
             Console.WriteLine("Invoking grpc withdraw");
-            var withdraw = new Transaction() { Id = "17", Amount = 10, };
-            await client.InvokeMethodGrpcAsync("grpcsample", "withdraw", data, cancellationToken);
+            var withdraw = new GrpcServiceSample.Generated.Transaction() { Id = "17", Amount = 10, };
+            await client.InvokeMethodGrpcAsync("grpcsample", "withdraw", withdraw, cancellationToken);
             Console.WriteLine("Completed grpc withdraw");
+
+            Console.WriteLine("Invoking grpc balance");
+            var request = new GetAccountRequest() { Id = "17", };
+            account = await client.InvokeMethodGrpcAsync<GetAccountRequest, Account>("grpcsample", "getaccount", request, cancellationToken);
+            Console.WriteLine($"Received grpc balance {account.Balance}");
         }
     }
 }

src/Dapr.Client/DaprClientGrpc.cs

@@ -129,6 +129,7 @@ private async Task MakePublishRequest(
             if (content != null)
             {
                 envelope.Data = content;
+                envelope.DataContentType = "application/json";
             }
 
             if (metadata != null)