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<XmlElement(ElementName:="invoiceNumber", _ IsNullable:=False)> _ Public InvoiceNum As String
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<XmlElement(ElementName:="supplierID", _ IsNullable:=False)> _ Public SupplierId As Integer
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<XmlElement(ElementName:="invoiceDate", _ DataType:="date", _ IsNullable:=False)> _ Public InvoiceDate As Date
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<XmlElement(ElementName:="poNumber", _ IsNullable:=False)> _ Public PONumber As String
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<XmlElement(ElementName:="subTotal", _ IsNullable:=False)> _ Property SubTotal() As Decimal Get SubTotal = MemInvoiceSubTotal End Get Set(ByVal Value As Decimal)
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End Set End Property
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<XmlElement(ElementName:="salesTax", _ IsNullable:=False)> _ Property SalesTaxAmt() As Decimal Get SalesTaxAmt = MemSalesTax End Get Set(ByVal Value As Decimal)
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<XmlElement(ElementName:="amtDue", _ IsNullable:=False)> _ Property AmountDue() As Decimal Get Return mAmountDue End Get Set(ByVal Value As Decimal)
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'Moved the InvoiceItems to the end of the class <XmlArray(ElementName:="invoiceItems"), _ XmlArrayItem("item", GetType(InvoiceItem))> _ Property InvoiceItems() As ArrayList Get Return mInvoiceItems End Get Set(ByVal Value As ArrayList)
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End Set End Property 'method to add a new invoice item Public Sub AddItem(ByVal InvItem As InvoiceItem)
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InvItemTotal = Round(InvItemUnitPrice * InvItemQuant, 2) mInvoiceItemsAdd(InvItem) End Sub 'method to compute the invoice total Public Function ComputeTotal(ByVal SalesTaxPercent As Decimal) As Decimal Dim ItemsTotal As Decimal Dim InvItem As InvoiceItem For Each InvItem In InvoiceItems ItemsTotal += InvItemQuant * InvItemUnitPrice Next MemInvoiceSubTotal = Round(ItemsTotal, 2) MemSalesTax = Round(MemInvoiceSubTotal * SalesTaxPercent, 2) MemAmountDue = Round(MemSalesTax + MemInvoiceSubTotal _ - MePreviousPayment, 2) Return MemAmountDue End Function
Public Sub New() mInvoiceItems = New ArrayList() End Sub End Class
Public Class InvoiceItem <XmlElement(ElementName:="partNum", _ IsNullable:=False)> _ Public PartNum As String <XmlElement(ElementName:="quant", _ IsNullable:=False)> _
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Public Quant As Integer <XmlElement(ElementName:="unitPrice", _ IsNullable:=False)> _ Public UnitPrice As Decimal <XmlElement(ElementName:="total", _ IsNullable:=False)> _ Public Total As Decimal End Class
This class is in a module that Imports SystemXmlSerialization therefore class names, such as XmlElement , need not be fully qualified The class begins with the now-familiar XmlRoot attribute The next interesting thing is the use of the XmlIgnore attribute to indicate that OrderNumber should not be serialized OrderNumber is only needed within the seller s application and is not part of the invoice schema Many of the names of properties and fields of this class do not match those in the schema, for example InvoiceNum and invoiceNumber The solution for this mismatch is to use the XmlElement attribute and set its ElementName property to the name specified in the schema, for example invoiceNumber Although VB is not case sensitive, case does matter when you serialize an object to XML The default name used for the XML element (or XML attribute), is the exact name that you use in your VB code Because XML is case sensitive, if the schema declares an element named SupplierID and your serialized object contains an element called SupplierId, you have an invalid XML document That s why the SupplierId field has the XmlElement attribute with its ElementName property set to SupplierID Note that case does not matter when you deserialize an object from XML because the XmlSerializer ignores the case of members in your VB class when deserializing The SellerInvoice class contains the calculated properties: SubTotal, SalesTaxAmt, and AmountDue These are exposed as properties (rather than fields) whose Set procedures do nothing Ideally, you d use read only properties for a scenario like this, however, the serializer cannot serialize read only properties This is unfortunate because there are scenarios (like the one we are discussing) where you want to serialize an object to XML then use that XML to deserialize a different object In these scenarios, having read only properties on the first object makes sense Instead of using an array for the invoice items, the seller uses an ArrayList The serializer can handle ArrayLists provided you add the XmlArrayItem attribute to tell the serializer the data type of items in this ArrayList XmlArrayItem also indicates the element name, in this case item , to use for each item in the ArrayList, The XmlArray attribute is used to tell the serializer the name to use for the XML element name that represents the entire array Finally, the SellerInvoice class has two methods AddItem adds a new invoice item to the InvoiceItems ArrayList and calculates the total cost for that item rounding it off to 2 digits after the decimal ComputeTotal calculates the sum of all item totals and stores it off as the invoice sub total It also calculates the sales tax and the invoice total, rounding all these numbers to 2 digits after the decimal point Now the seller must add code to his or her application to serialize the invoice to a string and call the buyer s SubmitInvoice method passing it that string In a real application, SubmitInvoice would be exposed as part of a Web service that the seller can call But we are not ready to invoke a Web service yet so we will just call the method directly This makes no difference in terms of how XSD and serialization are used Listing 2-15 shows the seller s code Listing 2-2-15 Seller's code for serializing and submitting the invoice