using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Xml.Serialization;

using System.Xml;

using System.IO;

using System.Diagnostics;

using System.Collections.ObjectModel;

using System.Threading;

using System.ComponentModel;

using System.Xml.Linq;

using System.Reflection;

using System.Data;

using System.Xml.Schema;

using System.Net;

using System.Xml.XPath;

using System.Globalization;

using System.Collections;

​

namespace Question42490161

{

​

    // https://stackoverflow.com/questions/42490161/how-to-serialize-listlistobject

​

    /// <remarks/>

    [System.CodeDom.Compiler.GeneratedCodeAttribute("xsd", "2.0.50727.3038")]

    [System.SerializableAttribute()]

    [System.Diagnostics.DebuggerStepThroughAttribute()]

    [System.ComponentModel.DesignerCategoryAttribute("code")]

    [System.Xml.Serialization.XmlTypeAttribute(AnonymousType=true)]

    [System.Xml.Serialization.XmlRootAttribute(Namespace="", IsNullable=false)]

    public partial class OxFordDefinition {

        private string sourceURLField;

        private string originDescField;

        private OxFordDefinition_perGroup[] _perGroupField;

        /// <remarks/>

        [System.Xml.Serialization.XmlElementAttribute(Form=System.Xml.Schema.XmlSchemaForm.Unqualified)]

        public string sourceURL {

            get {

                return this.sourceURLField;

            }

            set {

                this.sourceURLField = value;

            }

        }

        /// <remarks/>

        [System.Xml.Serialization.XmlElementAttribute(Form=System.Xml.Schema.XmlSchemaForm.Unqualified)]

        public string originDesc {

            get {

                return this.originDescField;

            }

            set {

                this.originDescField = value;

            }

        }

        /// <remarks/>

        [System.Xml.Serialization.XmlElementAttribute("_perGroup", Form=System.Xml.Schema.XmlSchemaForm.Unqualified)]

        public OxFordDefinition_perGroup[] _perGroup {

            get {

                return this._perGroupField;

            }

            set {

                this._perGroupField = value;

            }

        }

    }

    /// <remarks/>

    [System.CodeDom.Compiler.GeneratedCodeAttribute("xsd", "2.0.50727.3038")]

    [System.SerializableAttribute()]

    [System.Diagnostics.DebuggerStepThroughAttribute()]

    [System.ComponentModel.DesignerCategoryAttribute("code")]

    [System.Xml.Serialization.XmlTypeAttribute(AnonymousType=true)]

    public partial class OxFordDefinition_perGroup {

        private string _GroupDescField;

        private string _GroupSenseField;

        private string _GroupGrammerField;

        /// <remarks/>

        [System.Xml.Serialization.XmlElementAttribute(Form=System.Xml.Schema.XmlSchemaForm.Unqualified)]

        public string _GroupDesc {

            get {

                return this._GroupDescField;

            }

            set {

                this._GroupDescField = value;

            }

        }

        /// <remarks/>

        [System.Xml.Serialization.XmlElementAttribute(Form=System.Xml.Schema.XmlSchemaForm.Unqualified)]

        public string _GroupSense {

            get {

                return this._GroupSenseField;

            }

            set {

                this._GroupSenseField = value;

            }

        }

        /// <remarks/>

        [System.Xml.Serialization.XmlElementAttribute(Form=System.Xml.Schema.XmlSchemaForm.Unqualified)]

        public string _GroupGrammer {

            get {

                return this._GroupGrammerField;

            }

            set {

                this._GroupGrammerField = value;

            }

        }

        // THE FOLLOWING HAD TO BE FIXED.

        private OxFordDefinition_perGroup_perMainExample_perSubExample[] _perMainExampleField;

        /// <remarks/>

        [System.Xml.Serialization.XmlArrayAttribute(Form=System.Xml.Schema.XmlSchemaForm.Unqualified)]

        [System.Xml.Serialization.XmlArrayItemAttribute("_perSubExample", Form=System.Xml.Schema.XmlSchemaForm.Unqualified, IsNullable=false)]

        public OxFordDefinition_perGroup_perMainExample_perSubExample[] _perMainExample {

            get {

                return this._perMainExampleField;

            }

            set {

                this._perMainExampleField = value;

            }

        }

    }

    /// <remarks/>

    [System.CodeDom.Compiler.GeneratedCodeAttribute("xsd", "2.0.50727.3038")]

    [System.SerializableAttribute()]

    [System.Diagnostics.DebuggerStepThroughAttribute()]

    [System.ComponentModel.DesignerCategoryAttribute("code")]

    [System.Xml.Serialization.XmlTypeAttribute(AnonymousType=true)]

    public partial class OxFordDefinition_perGroup_perMainExample_perSubExample {

        private string _UpperTitleField;

        private string _FormGroupField;

        private string _SenseNotField;

        private string _GrammaticNotField;

        private string _DescField;

        private string _SynonymsField;

        private OxFordDefinition_perGroup_perMainExample_perSubExample_Example[] _ExampleField;

        /// <remarks/>

        [System.Xml.Serialization.XmlElementAttribute(Form=System.Xml.Schema.XmlSchemaForm.Unqualified)]

        public string _UpperTitle {

            get {

                return this._UpperTitleField;

            }

            set {

                this._UpperTitleField = value;

            }

        }

        /// <remarks/>

        [System.Xml.Serialization.XmlElementAttribute(Form=System.Xml.Schema.XmlSchemaForm.Unqualified)]

        public string _FormGroup {

            get {

                return this._FormGroupField;

            }

            set {

                this._FormGroupField = value;

            }

        }

        /// <remarks/>

        [System.Xml.Serialization.XmlElementAttribute(Form=System.Xml.Schema.XmlSchemaForm.Unqualified)]

        public string _SenseNot {

            get {

                return this._SenseNotField;

            }

            set {

                this._SenseNotField = value;

            }

        }

        /// <remarks/>

        [System.Xml.Serialization.XmlElementAttribute(Form=System.Xml.Schema.XmlSchemaForm.Unqualified)]

        public string _GrammaticNot {

            get {

                return this._GrammaticNotField;

            }

            set {

                this._GrammaticNotField = value;

            }

        }

        /// <remarks/>

        [System.Xml.Serialization.XmlElementAttribute(Form=System.Xml.Schema.XmlSchemaForm.Unqualified)]

        public string _Desc {

            get {

                return this._DescField;

            }

            set {

                this._DescField = value;

            }

        }

        /// <remarks/>

        [System.Xml.Serialization.XmlElementAttribute(Form=System.Xml.Schema.XmlSchemaForm.Unqualified)]

        public string _Synonyms {

            get {

                return this._SynonymsField;

            }

            set {

                this._SynonymsField = value;

            }

        }

        /// <remarks/>

        [System.Xml.Serialization.XmlElementAttribute("_Example", Form=System.Xml.Schema.XmlSchemaForm.Unqualified)]

        public OxFordDefinition_perGroup_perMainExample_perSubExample_Example[] _Example {

            get {

                return this._ExampleField;

            }

            set {

                this._ExampleField = value;

            }

        }

    }

    /// <remarks/>

    [System.CodeDom.Compiler.GeneratedCodeAttribute("xsd", "2.0.50727.3038")]

    [System.SerializableAttribute()]

    [System.Diagnostics.DebuggerStepThroughAttribute()]

    [System.ComponentModel.DesignerCategoryAttribute("code")]

    [System.Xml.Serialization.XmlTypeAttribute(AnonymousType=true)]

    public partial class OxFordDefinition_perGroup_perMainExample_perSubExample_Example {

        private string _SenseNotField;

        private string _GrammaticNotField;

        private string _DescField;

        /// <remarks/>

        [System.Xml.Serialization.XmlElementAttribute(Form=System.Xml.Schema.XmlSchemaForm.Unqualified)]

        public string _SenseNot {

            get {

                return this._SenseNotField;

            }

            set {

                this._SenseNotField = value;

            }

        }

        /// <remarks/>

        [System.Xml.Serialization.XmlElementAttribute(Form=System.Xml.Schema.XmlSchemaForm.Unqualified)]

        public string _GrammaticNot {

            get {

                return this._GrammaticNotField;

            }

            set {

                this._GrammaticNotField = value;

            }

        }

        /// <remarks/>

        [System.Xml.Serialization.XmlElementAttribute(Form=System.Xml.Schema.XmlSchemaForm.Unqualified)]

        public string _Desc {

            get {

                return this._DescField;

            }

            set {

                this._DescField = value;

            }

        }

    }

    /// <remarks/>

    [System.CodeDom.Compiler.GeneratedCodeAttribute("xsd", "2.0.50727.3038")]

    [System.SerializableAttribute()]

    [System.Diagnostics.DebuggerStepThroughAttribute()]

    [System.ComponentModel.DesignerCategoryAttribute("code")]

    [System.Xml.Serialization.XmlTypeAttribute(AnonymousType=true)]

    [System.Xml.Serialization.XmlRootAttribute(Namespace="", IsNullable=false)]

    public partial class NewDataSet {

        private OxFordDefinition[] itemsField;

        /// <remarks/>

        [System.Xml.Serialization.XmlElementAttribute("OxFordDefinition")]

        public OxFordDefinition[] Items {

            get {

                return this.itemsField;

            }

            set {

                this.itemsField = value;

            }

        }

    }

​

    class TestClass

    {

        internal static void Test()

        {

            string xml;

            using (var client = new WebClient())

            {

                xml = client.DownloadString("http://pastebin.com/raw/BJhRfFNf");

            }

            var root = xml.LoadFromXml<OxFordDefinition>();

            var xml2 = root.GetXml();

            Console.WriteLine("Deserialized and re-serialized XML: ");

            Console.WriteLine(xml2);

        }

    }

    public class Program

    {

        public static void Main()

        {

            TestClass.Test();

        }

    }

​

    public static class XmlSerializationHelper

    {

        public static T LoadFromXml<T>(this string xmlString, XmlSerializer serial = null)

        {

            serial = serial ?? new XmlSerializer(typeof(T));

            T returnValue = default(T);

            using (StringReader reader = new StringReader(xmlString))

            {

                object result = serial.Deserialize(reader);

                if (result is T)

                {

                    returnValue = (T)result;

                }

            }

            return returnValue;

        }

​

        public static string GetXml<T>(this T obj, XmlSerializer serializer = null, bool omitStandardNamespaces = false)

        {

            XmlSerializerNamespaces ns = null;

            if (omitStandardNamespaces)

            {

                ns = new XmlSerializerNamespaces();

                ns.Add("", ""); // Disable the xmlns:xsi and xmlns:xsd lines.

            }           

            using (var textWriter = new StringWriter())

            {

                var settings = new XmlWriterSettings() { Indent = true }; // For cosmetic purposes.

                using (var xmlWriter = XmlWriter.Create(textWriter, settings))

                    (serializer ?? new XmlSerializer(obj.GetType())).Serialize(xmlWriter, obj, ns);

                return textWriter.ToString();

            }

        }

    }

}

​