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diff --git a/csharp/src/Google.Protobuf/Reflection/OneofAccessor.cs b/csharp/src/Google.Protobuf/Reflection/OneofAccessor.cs
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-#region Copyright notice and license
-// Protocol Buffers - Google's data interchange format
-// Copyright 2015 Google Inc. All rights reserved.
-// https://developers.google.com/protocol-buffers/
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-// * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-// * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-// * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-#endregion
-
-using System;
-using System.Reflection;
-using Google.Protobuf.Compatibility;
-
-namespace Google.Protobuf.Reflection
-{
- /// <summary>
- /// Reflection access for a oneof, allowing clear and "get case" actions.
- /// </summary>
- public sealed class OneofAccessor
- {
- private readonly Func<IMessage, int> caseDelegate;
- private readonly Action<IMessage> clearDelegate;
- private OneofDescriptor descriptor;
-
- internal OneofAccessor(PropertyInfo caseProperty, MethodInfo clearMethod, OneofDescriptor descriptor)
- {
- if (!caseProperty.CanRead)
- {
- throw new ArgumentException("Cannot read from property");
- }
- this.descriptor = descriptor;
- caseDelegate = ReflectionUtil.CreateFuncIMessageT<int>(caseProperty.GetGetMethod());
-
- this.descriptor = descriptor;
- clearDelegate = ReflectionUtil.CreateActionIMessage(clearMethod);
- }
-
- /// <summary>
- /// Gets the descriptor for this oneof.
- /// </summary>
- /// <value>
- /// The descriptor of the oneof.
- /// </value>
- public OneofDescriptor Descriptor { get { return descriptor; } }
-
- /// <summary>
- /// Clears the oneof in the specified message.
- /// </summary>
- public void Clear(IMessage message)
- {
- clearDelegate(message);
- }
-
- /// <summary>
- /// Indicates which field in the oneof is set for specified message
- /// </summary>
- public FieldDescriptor GetCaseFieldDescriptor(IMessage message)
- {
- int fieldNumber = caseDelegate(message);
- if (fieldNumber > 0)
- {
- return descriptor.ContainingType.FindFieldByNumber(fieldNumber);
- }
- return null;
- }
- }
-}