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Generating SOAP Messages With XML Serialization

Because a SOAP message is built using XML, the XmlSerializer can be used to serialize classes and generate encoded SOAP messages. The resulting XML conforms to section 5 of the World Wide Web Consortium (www.w3.org) document "Simple Object Access Protocol (SOAP) 1.1". When you are creating an XML Web service that communicates through SOAP messages, you can customize the XML stream by applying a set of special SOAP attributes to classes and members of classes. For a list of attributes, see Attributes That Control Encoded SOAP Serialization.

To serialize an object as a SOAP-encoded XML stream

  1. Create the class using the XML Schema Definition tool (Xsd.exe).
  2. Apply one or more of the special attributes found in System.Xml.Serialization. See the list in "Attributes That Control Encoded SOAP Serialization."
  3. Create an XmlTypeMapping by creating a new SoapReflectionImporter, and invoking the ImportTypeMapping method with the type of the serialized class.

    The following example calls the ImportTypeMapping method of the SoapReflectionImporter class to create an XmlTypeMapping.

    ' Serializes a class named Group as a SOAP message.
    Dim myTypeMapping As XmlTypeMapping = (New SoapReflectionImporter(). _
    ImportTypeMapping(GetType(Group))
    [C#]// Serializes a class named Group as a SOAP message.
    XmlTypeMapping myTypeMapping = (new SoapReflectionImporter().
    ImportTypeMapping(typeof(Group));
    
  4. Create an instance of the XmlSerializer class by passing the XmlTypeMapping to the XmlSerializer constructor.
    Dim mySerializer As XmlSerializer = New XmlSerializer(myTypeMapping)
    [C#]XmlSerializer mySerializer = new XmlSerializer(myTypeMapping);
    
  5. Call the Serialize or Deserialize method.

Overriding Encoded SOAP XML Serialization

The process for overriding XML serialization of objects as SOAP messages is similar to the process for overriding standard XML serialization. (For details on overriding standard XML serialization, see Overriding XML Serialization.)

To override serialization of objects as SOAP messages

  1. Create an instance of the SoapAttributeOverrides class.
  2. Create a SoapAttributes for each class member that is being serialized.
  3. Create an instance of one or more of the attributes that affect XML serialization (for a list, see "Attributes That Control Encoded SOAP Serialization"), as appropriate, to the member being serialized.
  4. Set the appropriate property of the SoapAttributes to the attribute created in step 3.
  5. Add the SoapAttributes to the SoapAttributeOverrides.
  6. Create an XmlTypeMapping using the SoapAttributeOverrides. Use the SoapReflectionImporter.ImportTypeMapping method.
  7. Create an XmlSerializer using the XmlTypeMapping.
  8. Serialize or deserialize the object.

The example below serializes a file in two ways: first, without overriding the XmlSerializer class's behavior, and second, by overriding the behavior. The example contains a class named Group with several members. Various attributes, such as the SoapElementAttribute, have been applied to class members. When the class is serialized with the SerializeOriginal method, the attributes control the SOAP message content. When the SerializeOverride method is called, the behavior of the XmlSerializer is overridden by creating various attributes and setting the properties of a SoapAttributes to those attributes (as appropriate).

using System;
using System.IO;
using System.Xml;
using System.Xml.Serialization;
using System.Xml.Schema;

public class Group
{
    [SoapAttribute (Namespace = "http://www.cpandl.com")]
    public string GroupName;
    
    [SoapAttribute(DataType = "base64Binary")]
    public Byte [] GroupNumber;

    [SoapAttribute(DataType = "date", AttributeName = "CreationDate")]
    public DateTime Today;
    [SoapElement(DataType = "nonNegativeInteger", ElementName = "PosInt")]
    public string PostitiveInt;
    // This is ignored when serialized unless it is overridden.
    [SoapIgnore] 
    public bool IgnoreThis;

    public GroupType Grouptype;
    
    [SoapInclude(typeof(Car))]
    public Vehicle myCar(string licNumber)
    {
        Vehicle v;
        if(licNumber == "")
            {
                v = new Car();
            v.licenseNumber = "!!!!!!";
        }
        else
        {
            v = new Car();
            v.licenseNumber = licNumber;
        }
        return v;
    }
}

public abstract class Vehicle
{
    public string licenseNumber;
    public DateTime makeDate;
}

public class Car: Vehicle
{
}

public enum GroupType
{
    // These enums can be overridden.
    small,
    large
}
    
public class Run
{
    public static void Main()
    {
        Run test = new Run();
        test.SerializeOriginal("SoapOriginal.xml");
        test.SerializeOverride("SoapOverrides.xml");
        test.DeserializeOriginal("SoapOriginal.xml");
        test.DeserializeOverride("SoapOverrides.xml");
    
    }
    public void SerializeOriginal(string filename)
    {
        // Creates an instance of the XmlSerializer class.
        XmlTypeMapping myMapping = 
        (new SoapReflectionImporter().ImportTypeMapping(
        typeof(Group)));
        XmlSerializer mySerializer =  
        new XmlSerializer(myMapping);

        // Writing the file requires a TextWriter.
        TextWriter writer = new StreamWriter(filename);

        // Creates an instance of the class that will be serialized.
        Group myGroup = new Group();

        // Sets the object properties.
        myGroup.GroupName = ".NET";

        Byte [] hexByte = new Byte[2]{Convert.ToByte(100),
        Convert.ToByte(50)};
        myGroup.GroupNumber = hexByte;

        DateTime myDate = new DateTime(2002,5,2);
        myGroup.Today = myDate;

        myGroup.PostitiveInt= "10000";
        myGroup.IgnoreThis=true;
        myGroup.Grouptype= GroupType.small;
        Car thisCar =(Car)  myGroup.myCar("1234566");

        // Prints the license number just to prove the car was created.
        Console.WriteLine("License#: " + thisCar.licenseNumber + "\n");

        // Serializes the class, and closes the TextWriter.
        mySerializer.Serialize(writer, myGroup);
        writer.Close();
    }

    public void SerializeOverride(string filename)
    {
        // Creates an instance of the XmlSerializer class
        // that overrides the serialization.
        XmlSerializer overRideSerializer = CreateOverrideSerializer();

        // Writing the file requires a TextWriter.
        TextWriter writer = new StreamWriter(filename);

        // Creates an instance of the class that will be serialized.
        Group myGroup = new Group();

        // Sets the object properties.
        myGroup.GroupName = ".NET";

        Byte [] hexByte = new Byte[2]{Convert.ToByte(100),
        Convert.ToByte(50)};
        myGroup.GroupNumber = hexByte;

        DateTime myDate = new DateTime(2002,5,2);
        myGroup.Today = myDate;


        myGroup.PostitiveInt= "10000";
        myGroup.IgnoreThis=true;
        myGroup.Grouptype= GroupType.small;
        Car thisCar =(Car)  myGroup.myCar("1234566");

        // Serializes the class, and closes the TextWriter.
        overRideSerializer.Serialize(writer, myGroup);
         writer.Close();
    }

    public void DeserializeOriginal(string filename)
    {
        // Creates an instance of the XmlSerializer class.
        XmlTypeMapping myMapping = 
        (new SoapReflectionImporter().ImportTypeMapping(
        typeof(Group)));
        XmlSerializer mySerializer =  
        new XmlSerializer(myMapping);

        TextReader reader = new StreamReader(filename);

        // Deserializes and casts the object.
        Group myGroup; 
        myGroup = (Group) mySerializer.Deserialize(reader);

        Console.WriteLine(myGroup.GroupName);
        Console.WriteLine(myGroup.GroupNumber[0]);
        Console.WriteLine(myGroup.GroupNumber[1]);
        Console.WriteLine(myGroup.Today);
        Console.WriteLine(myGroup.PostitiveInt);
        Console.WriteLine(myGroup.IgnoreThis);
        Console.WriteLine();
    }

    public void DeserializeOverride(string filename)
    {
        // Creates an instance of the XmlSerializer class.
        XmlSerializer overRideSerializer = CreateOverrideSerializer();
        // Reading the file requires a TextReader.
        TextReader reader = new StreamReader(filename);

        // Deserializes and casts the object.
        Group myGroup; 
        myGroup = (Group) overRideSerializer.Deserialize(reader);

        Console.WriteLine(myGroup.GroupName);
        Console.WriteLine(myGroup.GroupNumber[0]);
        Console.WriteLine(myGroup.GroupNumber[1]);
        Console.WriteLine(myGroup.Today);
        Console.WriteLine(myGroup.PostitiveInt);
        Console.WriteLine(myGroup.IgnoreThis);
    }

    private XmlSerializer CreateOverrideSerializer()
    {
        SoapAttributeOverrides mySoapAttributeOverrides = 
        new SoapAttributeOverrides();
        SoapAttributes soapAtts = new SoapAttributes();

        SoapElementAttribute mySoapElement = new SoapElementAttribute();
        mySoapElement.ElementName = "xxxx";
        soapAtts.SoapElement = mySoapElement;
        mySoapAttributeOverrides.Add(typeof(Group), "PostitiveInt", 
        soapAtts);

        // Overrides the IgnoreThis property.
        SoapIgnoreAttribute myIgnore = new SoapIgnoreAttribute();
        soapAtts = new SoapAttributes();
        soapAtts.SoapIgnore = false;      
        mySoapAttributeOverrides.Add(typeof(Group), "IgnoreThis", 
        soapAtts);

        // Overrides the GroupType enumeration.
        soapAtts = new SoapAttributes();
        SoapEnumAttribute xSoapEnum = new SoapEnumAttribute();
        xSoapEnum.Name = "Over1000";
        soapAtts.SoapEnum = xSoapEnum;

        // Adds the SoapAttributes to the 
        // mySoapAttributeOverridesrides.
        mySoapAttributeOverrides.Add(typeof(GroupType), "large", 
        soapAtts);

        // Creates a second enumeration and adds it.
        soapAtts = new SoapAttributes();
        xSoapEnum = new SoapEnumAttribute();
        xSoapEnum.Name = "ZeroTo1000";
        soapAtts.SoapEnum = xSoapEnum;
        mySoapAttributeOverrides.Add(typeof(GroupType), "small", 
        soapAtts);

        // Overrides the Group type.
        soapAtts = new SoapAttributes();
        SoapTypeAttribute soapType = new SoapTypeAttribute();
        soapType.TypeName = "Team";
        soapAtts.SoapType = soapType;
        mySoapAttributeOverrides.Add(typeof(Group),soapAtts);

        // Creates an XmlTypeMapping that is used to create an instance 
        // of the XmlSerializer class. Then returns the XmlSerializer.
        XmlTypeMapping myMapping = (new SoapReflectionImporter(
        mySoapAttributeOverrides)).ImportTypeMapping(typeof(Group));
    
        XmlSerializer ser = new XmlSerializer(myMapping);
        return ser;
    }
}

See Also

XML Serialization | Attributes That Control Encoded SOAP Serialization | XML Serialization with XML Web Services

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