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Showing content from https://docs.microsoft.com/en-us/dotnet/api/system.xml.serialization.xmlincludeattribute below:

XmlIncludeAttribute Class (System.Xml.Serialization) | Microsoft Learn

Allows the XmlSerializer to recognize a type when it serializes or deserializes an object.

public ref class XmlIncludeAttribute : Attribute

[System.AttributeUsage(System.AttributeTargets.Class | System.AttributeTargets.Interface | System.AttributeTargets.Method | System.AttributeTargets.Struct, AllowMultiple=true)]
public class XmlIncludeAttribute : Attribute

[System.AttributeUsage(System.AttributeTargets.Class | System.AttributeTargets.Method | System.AttributeTargets.Struct, AllowMultiple=true)]
public class XmlIncludeAttribute : Attribute

[<System.AttributeUsage(System.AttributeTargets.Class | System.AttributeTargets.Interface | System.AttributeTargets.Method | System.AttributeTargets.Struct, AllowMultiple=true)>]
type XmlIncludeAttribute = class
    inherit Attribute

[<System.AttributeUsage(System.AttributeTargets.Class | System.AttributeTargets.Method | System.AttributeTargets.Struct, AllowMultiple=true)>]
type XmlIncludeAttribute = class
    inherit Attribute

Public Class XmlIncludeAttribute
Inherits Attribute

Inheritance

Attributes

The following example shows three classes, two of which inherit from the third. The example applies the XmlIncludeAttribute to a method that returns an instance of one of the derived classes.

<%@ WebService Language="C#" Class="Test" %>
 
using System;
using System.Web.Services;
using System.Web.Services.Protocols;
using System.Web.Services.Description;
using System.Xml;
using System.Xml.Schema;
using System.Xml.Serialization;
using System.Data;
 
public class Test : WebService {
   [WebMethod()]
   [return:XmlElement("MyTime", DataType="time")]
   public DateTime EchoString([XmlElement(DataType="string")] 
   string strval) {
        return DateTime.Now;
   }
 
   [WebMethod()]
   [XmlInclude(typeof(Car)), XmlInclude(typeof(Bike))]
   public Vehicle Vehicle(string licenseNumber) {
      if (licenseNumber == "0") {
         Vehicle v = new Car();
         v.licenseNumber = licenseNumber;
         return v;
      }
      else if (licenseNumber == "1") {
          Vehicle v = new Bike();
          v.licenseNumber = licenseNumber;
          return v;
      }
      else {
         return null;
      }
   }
}
[XmlRoot("NewVehicle")] 
public abstract class Vehicle {
    public string licenseNumber;
    public DateTime make;
}
 
public class Car : Vehicle {
}
 
public class Bike : Vehicle {
}

Use the XmlIncludeAttribute when you call the Serialize or Deserialize method of the XmlSerializer class.

When applying the XmlIncludeAttribute, specify the Type of the derived class. When the XmlSerializer serializes objects that include both the base and the derived class, it can then recognize both object types.

You can use the XmlIncludeAttribute to include derived classes in service description documents that are written in the Web Services Description Language (WSDL). For example, if a method returns an Object, apply the XmlIncludeAttribute to the method and specify the actual types to return.

For more information on the WSDL, see Web Services Description Language (WSDL) 1.1.

Gets or sets the type of the object to include.

When implemented in a derived class, gets a unique identifier for this Attribute.

Maps a set of names to a corresponding set of dispatch identifiers.

Retrieves the type information for an object, which can be used to get the type information for an interface.

Retrieves the number of type information interfaces that an object provides (either 0 or 1).

Provides access to properties and methods exposed by an object.

• XmlSerializer
• XmlAttributes
• Introducing XML Serialization
• How to: Specify an Alternate Element Name for an XML Stream
• Controlling XML Serialization Using Attributes
• Examples of XML Serialization
• XML Schema Definition Tool (Xsd.exe)

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