using System;

using System.IO;

using System.Reflection.Emit;

using System.Xml;

using System.Xml.Linq;

using System.Xml.Schema;

using System.Xml.Serialization;

​

public class Program

{

    public static void Main()

    {

        const string schemaXml = @"<xs:schema targetNamespace=""http://something.com/xmlcourse""

      elementFormDefault=""qualified""

      xmlns=""http://something.com/xmlcourse""

      xmlns:lexc=""http://something.com/xmlcourse""

      xmlns:xs=""http://www.w3.org/2001/XMLSchema""

               >

​

        <!-- Type Definitions -->

​

        <xs:simpleType name=""nonNegativeDecimal"">

        <xs:restriction base=""xs:decimal"">

        <xs:minInclusive value=""0"" />

        </xs:restriction>

        </xs:simpleType>

​

        <xs:simpleType name=""emailAddress"">

        <xs:restriction base=""xs:string"">

        <xs:pattern value=""[^@]+@[^\.]+\..+""/>

        </xs:restriction>

        </xs:simpleType>

​

        <xs:simpleType name=""phoneNumber"">

        <xs:restriction base=""xs:string"">

        <xs:pattern value=""[0-9]{3}[-\.][0-9]{3}[-\.][0-9]{4}""/>

        </xs:restriction>

        </xs:simpleType>

​

        <xs:simpleType name=""address"">

        <xs:restriction base=""xs:string"">

        <xs:enumeration value=""apartment""/>

        <xs:enumeration value=""condominium""/>

        <xs:enumeration value=""townhouse""/>

        <xs:enumeration value=""duplex""/>

        <xs:enumeration value=""house""/>

        <xs:enumeration value=""residence""/>

        </xs:restriction>

        </xs:simpleType>

​

        <!-- Attributes are used for date and time on last_updated -->

        <xs:complexType name=""dateAndTime"">

        <xs:attribute name=""date"" type=""xs:date""></xs:attribute>

        <xs:attribute name=""time"" type=""xs:time""></xs:attribute>

        </xs:complexType>

​

        <xs:complexType name=""listing"">

        <xs:sequence>

        <xs:element name=""id"" type=""xs:string"" minOccurs=""1"" maxOccurs=""1""></xs:element>

        <xs:element name=""type"" type=""lexc:address"" minOccurs=""1"" maxOccurs=""1""></xs:element>

        <xs:element name=""address"" type=""xs:string"" minOccurs=""1"" maxOccurs=""1""></xs:element>

        <xs:element name=""contact_name"" type=""xs:string"" minOccurs=""0"" maxOccurs=""1""></xs:element>

        <xs:element name=""contact_phone"" type=""lexc:phoneNumber"" minOccurs=""1"" maxOccurs=""3""></xs:element>

        <xs:element name=""contact_email"" type=""lexc:emailAddress"" minOccurs=""0"" maxOccurs=""1""></xs:element>

        <xs:element name=""rent"" type=""lexc:nonNegativeDecimal"" minOccurs=""1"" maxOccurs=""1""></xs:element>

        </xs:sequence>

        </xs:complexType>

​

​

        <!-- Schema Instance Contents -->

        <xs:element name=""housing"">

        <xs:complexType>

        <xs:sequence>

        <xs:element name=""listings"">

        <xs:complexType>

        <xs:sequence>

        <xs:element name=""listing"" type=""lexc:listing"" minOccurs=""0"" maxOccurs=""unbounded""></xs:element>

        </xs:sequence>

        </xs:complexType>

        <xs:unique name=""uniqueId"">

        <xs:selector xpath=""lexc:listing""></xs:selector>

        <xs:field xpath=""@id""></xs:field>

        </xs:unique>

        </xs:element>

        <xs:element name=""last_updated"" type=""lexc:dateAndTime"" minOccurs=""1"" maxOccurs=""1""></xs:element>

        </xs:sequence>

        </xs:complexType>

        </xs:element>

​

        </xs:schema>";

​

      const string xml = @"<housing xmlns=""http://something.com/xmlcourse"">

  <listings>

    <listing>

      <id>apt1</id>

      <type>wrongtype</type> <!-- Type does not exist -->

      <address>556 Huckaby Lane</address>

      <contact_name>John Spacer</contact_name>

      <contact_phone>555-555-5555</contact_phone> <!-- Over Max of 3 Phone Numbers-->

      <contact_phone>555-555-5555</contact_phone>

      <contact_phone>555-555-5555</contact_phone>

      <contact_phone>555-555-5555</contact_phone>

      <contact_email>kestrel.gmail.com</contact_email> <!-- Wrong Format for Email Address -->

      <rent>123.45</rent>

    </listing>

    <listing>

      <id>cdm1</id>

      <type>condominium</type>

      <address>123 Saskatoon Lane</address>

      <contact_name>George Romero</contact_name>

      <contact_phone>123.456.7890</contact_phone>

      <contact_email>jasper@montypython.com</contact_email>

      <rent>445.5</rent>

    </listing>

  </listings>

  <last_updated date=""2017-05-15"" time=""12:12:12"" />

</housing>";

​

      var schema = XmlSchema.Read(new StringReader(schemaXml), null);

​

      var schemaSet = new XmlSchemaSet();

      schemaSet.Add(schema);

      var settings = new XmlReaderSettings

      {

        ValidationFlags = XmlSchemaValidationFlags.ReportValidationWarnings,

        ValidationType = ValidationType.Schema,

        Schemas = schemaSet

      };

​

      settings.ValidationEventHandler += (s, e) => Console.WriteLine(e.Message);

​

      using (var reader = XmlReader.Create(new StringReader(xml), settings))

      {

        while (reader.Read())

        {

        }

      }

    }

}