Implementing serialization and input/output functionality in a .NET Framework application

These questions are based on 70-622CSHP – TS: Microsoft .NET Framework 2.0 – Application Development Foundation (C#.NET) Microsoft Self-Test Software Practice Test.

Objective: Implementing serialization and input/output functionality in a .NET Framework application
SubObjective: Control the serialization of an object into XML format by using the System.Xml.Serialization namespace

Item No. 70-536CSHP.4.2.1
Single Answer, Multiple Choice

You are an application developer for a company. You have created a point of sale application that serializes sales products into XML. This XML will be consumed by a company partner. You have created the appropriate serializable classes as shown in the exhibit. (Click the Exhibit(s) button.)

You decide to create the following code to test the serialization process:

public void Serialize ( string filename ) {
     XmlSerializer serializer = new XmlSerializer( typeof( Region ) );
     StreamWriter writer = new StreamWriter( filename );
     SalesProduct product1 = new SalesProduct();
     product1.Name = “Sofa”;
     product1.IsTaxable = true;
     Product productDisplay = new Product();
     productDisplay.Name = “Television”;
     Region region = new Region();
     region.Name = “East”;
     region.Products = new Product[] { product1, productDisplay };
     serializer.Serialize( writer, region );
     writer.Close();
}

If you were to invoke the Serialize method, what would be the contents of the file?

1. <?xml version=”1.0″ encoding=”utf-8″?>
   <Region xmlns:xsi=”http://www.w3.org/2001/XMLSchema-instance”
     xmlns:xsd=”http://www.w3.org/2001/XMLSchema”>
        <Products>
             <Product> IsTaxable=”true”>Sofa</Product>
             <Product>Television</Product>
        </Products>
   </Region>
   
   
   
2. <?xml version=”1.0″ encoding=”utf-8″?>
   <Region xmlns:xsi=”http://www.w3.org/2001/XMLSchema-instance”
     xmlns:xsd=”http://www.w3.org/2001/XMLSchema”>
        <Products>
             <SalesProduct>
                  <IsTaxable>true</IsTaxable>
                  <Name>Sofa</Name>
             </SalesProduct>
             <Product>
                  <Name>Television</Name>
             </Product>
        </Products>
   </Region>
   
   
   
3. <?xml version=”1.0″ encoding=”utf-8″?>
   <Region xmlns:xsi=”http://www.w3.org/2001/XMLSchema-instance”
     xmlns:xsd=http://www.w3.org/2001/XMLSchema>
        <Name>East</Name>
        <Products>
             <SalesProduct Taxable=”true”>
                  <Name>Sofa</Name>
             </SalesProduct>
             <Product>
                  <Name>Television</Name>
             </Product>
        </Products>
   </Region>
   
   
   
4. <?xml version=”1.0″ encoding=”utf-8″?>
   <Region xmlns:xsi=”http://www.w3.org/2001/XMLSchema-instance”
     xmlns:xsd=”http://www.w3.org/2001/XMLSchema” Area=”East”>
        <Products>
             <SalesProduct Taxable=”true”>
                  <Name>Sofa</Name>
             </SalesProduct>
             <Product>
                  <Name>Television</Name>
             </Product>
        </Products>
   </Region>

Answer:

4. <?xml version=”1.0″ encoding=”utf-8″?>
   <Region xmlns:xsi=”http://www.w3.org/2001/XMLSchema-instance”
     xmlns:xsd=”http://www.w3.org/2001/XMLSchema” Area=”East”>
        <Products>
             <SalesProduct Taxable=”true”>
                  <Name>Sofa</Name>
             </SalesProduct>
             <Product>
                  <Name>Television</Name>
             </Product>
        </Products>
   </Region>

Tutorial:
If invoked, the Serialize method would generate the following file contents:

<?xml version=”1.0″ encoding=”utf-8″?>
<Region xmlns:xsi=”http://www.w3.org/2001/XMLSchema-instance”
  xmlns:xsd=”http://www.w3.org/2001/XMLSchema” Area=”East”>
     <Products>
          <SalesProduct Taxable=”true”>
               <Name>Sofa</Name>
          </SalesProduct>
          <Product>
               <Name>Television</Name>
          </Product>
     </Products>
</Region>

This code is generated because of the inclusion and exclusion of XML serialization attributes. The Product class contains no XML-specific attributes, so the Name field will translate into the Name element. The ID field will not serialize because it is a private member. The XmlElement attribute can specify the element name if it is different from the field name. The SalesProduct class inherits the Product class and adds the IsTaxable