websocket-sharpのビルド

こちらのサイトを参考にwebsocket-sharpのビルドをしてみましたが、うまくいかず以下のエラー
（visualstudio2017です。）

重大度レベル	コード	説明	プロジェクト	ファイル	行	抑制状態
エラー	CS0540	'CookieException.ISerializable.GetObjectData(SerializationInfo, StreamingContext)': 含む型は、インターフェイス 'ISerializable' を実装しません。	websocket-sharp	D:\websocket-sharp-master\websocket-sharp\Net\CookieException.cs	156	アクティブ

https://github.com/sta/websocket-sharp/issues/544
調べるとISerializableの部分がエラーになってました。
あまり詳しくなくてどの部分を削除すればいいのかわかりませんでした。

回答お願いします！！

        void ISerializable.GetObjectData(
      SerializationInfo serializationInfo, StreamingContext streamingContext
    )
        {
            base.GetObjectData(serializationInfo, streamingContext);
        }

#region License
/*
 * CookieException.cs
 *
 * This code is derived from CookieException.cs (System.Net) of Mono
 * (http://www.mono-project.com).
 *
 * The MIT License
 *
 * Copyright (c) 2012-2019 sta.blockhead
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
#endregion

#region Authors
/*
 * Authors:
 * - Lawrence Pit <loz@cable.a2000.nl>
 */
#endregion

using System;
using System.Runtime.Serialization;
using System.Security.Permissions;

namespace WebSocketSharp.Net
{
  /// <summary>
  /// The exception that is thrown when a <see cref="Cookie"/> gets an error.
  /// </summary>
  [Serializable]
  public class CookieException : FormatException
  {
    #region Internal Constructors

    internal CookieException (string message)
      : base (message)
    {
    }

    internal CookieException (string message, Exception innerException)
      : base (message, innerException)
    {
    }

    #endregion

    #region Protected Constructors

    /// <summary>
    /// Initializes a new instance of the <see cref="CookieException"/> class
    /// with the serialized data.
    /// </summary>
    /// <param name="serializationInfo">
    /// A <see cref="SerializationInfo"/> that holds the serialized object data.
    /// </param>
    /// <param name="streamingContext">
    /// A <see cref="StreamingContext"/> that specifies the source for
    /// the deserialization.
    /// </param>
    /// <exception cref="ArgumentNullException">
    /// <paramref name="serializationInfo"/> is <see langword="null"/>.
    /// </exception>
    protected CookieException (
      SerializationInfo serializationInfo, StreamingContext streamingContext
    )
      : base (serializationInfo, streamingContext)
    {
    }

    #endregion

    #region Public Constructors

    /// <summary>
    /// Initializes a new instance of the <see cref="CookieException"/> class.
    /// </summary>
    public CookieException ()
      : base ()
    {
    }

    #endregion

    #region Public Methods

    /// <summary>
    /// Populates the specified <see cref="SerializationInfo"/> instance with
    /// the data needed to serialize the current instance.
    /// </summary>
    /// <param name="serializationInfo">
    /// A <see cref="SerializationInfo"/> that holds the serialized object data.
    /// </param>
    /// <param name="streamingContext">
    /// A <see cref="StreamingContext"/> that specifies the destination for
    /// the serialization.
    /// </param>
    /// <exception cref="ArgumentNullException">
    /// <paramref name="serializationInfo"/> is <see langword="null"/>.
    /// </exception>
    [
      SecurityPermission (
        SecurityAction.LinkDemand,
        Flags = SecurityPermissionFlag.SerializationFormatter
      )
    ]
    public override void GetObjectData (
      SerializationInfo serializationInfo, StreamingContext streamingContext
    )
    {
      base.GetObjectData (serializationInfo, streamingContext);
    }

    #endregion

    #region Explicit Interface Implementation

    /// <summary>
    /// Populates the specified <see cref="SerializationInfo"/> instance with
    /// the data needed to serialize the current instance.
    /// </summary>
    /// <param name="serializationInfo">
    /// A <see cref="SerializationInfo"/> that holds the serialized object data.
    /// </param>
    /// <param name="streamingContext">
    /// A <see cref="StreamingContext"/> that specifies the destination for
    /// the serialization.
    /// </param>
    /// <exception cref="ArgumentNullException">
    /// <paramref name="serializationInfo"/> is <see langword="null"/>.
    /// </exception>
    [
      SecurityPermission (
        SecurityAction.LinkDemand,
        Flags = SecurityPermissionFlag.SerializationFormatter,
        SerializationFormatter = true
      )
    ]
        void ISerializable.GetObjectData(
      SerializationInfo serializationInfo, StreamingContext streamingContext
    )
        {
            base.GetObjectData(serializationInfo, streamingContext);
        }

        #endregion

    }
}