diff --git a/lib/netstd/Thrift/Protocol/TBase.cs b/lib/netstd/Thrift/Protocol/TBase.cs
index b5ef2ae..df9dd34 100644
--- a/lib/netstd/Thrift/Protocol/TBase.cs
+++ b/lib/netstd/Thrift/Protocol/TBase.cs
@@ -22,12 +22,13 @@
 {
     public interface TUnionBase
     {
-        Task WriteAsync(TProtocol tProtocol, CancellationToken cancellationToken = default(CancellationToken));
+        Task WriteAsync(TProtocol tProtocol, CancellationToken cancellationToken = default);
     }
 
     // ReSharper disable once InconsistentNaming
     public interface TBase : TUnionBase
     {
-        Task ReadAsync(TProtocol tProtocol, CancellationToken cancellationToken = default(CancellationToken));
+        Task ReadAsync(TProtocol tProtocol, CancellationToken cancellationToken = default);
     }
+
 }
diff --git a/lib/netstd/Thrift/Protocol/ToString.cs b/lib/netstd/Thrift/Protocol/ToString.cs
new file mode 100644
index 0000000..14fa520
--- /dev/null
+++ b/lib/netstd/Thrift/Protocol/ToString.cs
@@ -0,0 +1,82 @@
+// Licensed to the Apache Software Foundation(ASF) under one
+// or more contributor license agreements.See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership.The ASF licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// with the License. You may obtain a copy of the License at
+// 
+//     http://www.apache.org/licenses/LICENSE-2.0
+// 
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied. See the License for the
+// specific language governing permissions and limitations
+// under the License.
+
+using System;
+using System.Collections;
+using System.Collections.Generic;
+using System.Text;
+using Thrift.Protocol;
+
+namespace Thrift.Protocol
+{
+
+
+    public static class ToStringExtensions
+    {
+        public static void ToString(this object self, StringBuilder sb, bool first = true)
+        {
+            if (!first)
+                sb.Append(", ");
+
+            bool first_child = true;
+            if (self is string) // string is IEnumerable
+            {
+                sb.Append('"');
+                sb.Append(self);
+                sb.Append('"');
+            }
+            else if (self is IDictionary)
+            {
+                sb.Append("{ ");
+                foreach (DictionaryEntry pair in (self as IDictionary))
+                {
+                    if (first_child)
+                        first_child = false;
+                    else
+                        sb.Append(",");
+
+                    sb.Append("{ ");
+                    pair.Key.ToString(sb);
+                    sb.Append(", ");
+                    pair.Value.ToString(sb);
+                    sb.Append("}");
+                }
+                sb.Append("}");
+            }
+            else if (self is IEnumerable)
+            {
+                sb.Append("{ ");
+                foreach (var elm in (self as IEnumerable))
+                {
+                    elm.ToString(sb, first_child);
+                    first_child = false;
+                }
+                sb.Append("}");
+            }
+            else if (self is TBase)
+            {
+                sb.Append((self as TBase).ToString());
+            }
+            else
+            {
+                sb.Append(self != null?  self.ToString() : "<null>");
+            }
+        }
+    }
+
+
+}