本文整理汇总了VB.NET中System.Xml.Serialization.XmlSerializer类的典型用法代码示例。如果您正苦于以下问题:VB.NET XmlSerializer类的具体用法?VB.NET XmlSerializer怎么用?VB.NET XmlSerializer使用的例子?那么, 这里精选的类代码示例或许可以为您提供帮助。
在下文中一共展示了XmlSerializer类的1个代码示例,这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞,您的评价将有助于系统推荐出更棒的VB.NET代码示例。
示例1: PurchaseOrder
' 导入命名空间
Imports System.Xml
Imports System.Xml.Serialization
Imports System.IO
' The XmlRootAttribute allows you to set an alternate name
' (PurchaseOrder) of the XML element, the element namespace; by
' default, the XmlSerializer uses the class name. The attribute
' also allows you to set the XML namespace for the element. Lastly,
' the attribute sets the IsNullable property, which specifies whether
' the xsi:null attribute appears if the class instance is set to
' a null reference.
<XmlRootAttribute("PurchaseOrder", _
Namespace := "http://www.cpandl.com", IsNullable := False)> _
Public Class PurchaseOrder
Public ShipTo As Address
Public OrderDate As String
' The XmlArrayAttribute changes the XML element name
' from the default of "OrderedItems" to "Items".
<XmlArrayAttribute("Items")> _
Public OrderedItems() As OrderedItem
Public SubTotal As Decimal
Public ShipCost As Decimal
Public TotalCost As Decimal
End Class
Public Class Address
' The XmlAttribute instructs the XmlSerializer to serialize the Name
' field as an XML attribute instead of an XML element (the default
' behavior).
<XmlAttribute()> _
Public Name As String
Public Line1 As String
' Setting the IsNullable property to false instructs the
' XmlSerializer that the XML attribute will not appear if
' the City field is set to a null reference.
<XmlElementAttribute(IsNullable := False)> _
Public City As String
Public State As String
Public Zip As String
End Class
Public Class OrderedItem
Public ItemName As String
Public Description As String
Public UnitPrice As Decimal
Public Quantity As Integer
Public LineTotal As Decimal
' Calculate is a custom method that calculates the price per item,
' and stores the value in a field.
Public Sub Calculate()
LineTotal = UnitPrice * Quantity
End Sub
End Class
Public Class Test
Public Shared Sub Main()
' Read and write purchase orders.
Dim t As New Test()
t.CreatePO("po.xml")
t.ReadPO("po.xml")
End Sub
Private Sub CreatePO(filename As String)
' Create an instance of the XmlSerializer class;
' specify the type of object to serialize.
Dim serializer As New XmlSerializer(GetType(PurchaseOrder))
Dim writer As New StreamWriter(filename)
Dim po As New PurchaseOrder()
' Create an address to ship and bill to.
Dim billAddress As New Address()
billAddress.Name = "Teresa Atkinson"
billAddress.Line1 = "1 Main St."
billAddress.City = "AnyTown"
billAddress.State = "WA"
billAddress.Zip = "00000"
' Set ShipTo and BillTo to the same addressee.
po.ShipTo = billAddress
po.OrderDate = System.DateTime.Now.ToLongDateString()
' Create an OrderedItem object.
Dim i1 As New OrderedItem()
i1.ItemName = "Widget S"
i1.Description = "Small widget"
i1.UnitPrice = CDec(5.23)
i1.Quantity = 3
i1.Calculate()
' Insert the item into the array.
Dim items(0) As OrderedItem
items(0) = i1
po.OrderedItems = items
' Calculate the total cost.
Dim subTotal As New Decimal()
Dim oi As OrderedItem
For Each oi In items
subTotal += oi.LineTotal
Next oi
po.SubTotal = subTotal
po.ShipCost = CDec(12.51)
po.TotalCost = po.SubTotal + po.ShipCost
' Serialize the purchase order, and close the TextWriter.
serializer.Serialize(writer, po)
writer.Close()
End Sub
Protected Sub ReadPO(filename As String)
' Create an instance of the XmlSerializer class;
' specify the type of object to be deserialized.
Dim serializer As New XmlSerializer(GetType(PurchaseOrder))
' If the XML document has been altered with unknown
' nodes or attributes, handle them with the
' UnknownNode and UnknownAttribute events.
AddHandler serializer.UnknownNode, AddressOf serializer_UnknownNode
AddHandler serializer.UnknownAttribute, AddressOf serializer_UnknownAttribute
' A FileStream is needed to read the XML document.
Dim fs As New FileStream(filename, FileMode.Open)
' Declare an object variable of the type to be deserialized.
Dim po As PurchaseOrder
' Use the Deserialize method to restore the object's state with
' data from the XML document.
po = CType(serializer.Deserialize(fs), PurchaseOrder)
' Read the order date.
Console.WriteLine(("OrderDate: " & po.OrderDate))
' Read the shipping address.
Dim shipTo As Address = po.ShipTo
ReadAddress(shipTo, "Ship To:")
' Read the list of ordered items.
Dim items As OrderedItem() = po.OrderedItems
Console.WriteLine("Items to be shipped:")
Dim oi As OrderedItem
For Each oi In items
Console.WriteLine((ControlChars.Tab & oi.ItemName & ControlChars.Tab & _
oi.Description & ControlChars.Tab & oi.UnitPrice & ControlChars.Tab & _
oi.Quantity & ControlChars.Tab & oi.LineTotal))
Next oi
' Read the subtotal, shipping cost, and total cost.
Console.WriteLine(( New String(ControlChars.Tab, 5) & _
" Subtotal" & ControlChars.Tab & po.SubTotal))
Console.WriteLine(New String(ControlChars.Tab, 5) & _
" Shipping" & ControlChars.Tab & po.ShipCost )
Console.WriteLine( New String(ControlChars.Tab, 5) & _
" Total" & New String(ControlChars.Tab, 2) & po.TotalCost)
End Sub
Protected Sub ReadAddress(a As Address, label As String)
' Read the fields of the Address object.
Console.WriteLine(label)
Console.WriteLine(ControlChars.Tab & a.Name)
Console.WriteLine(ControlChars.Tab & a.Line1)
Console.WriteLine(ControlChars.Tab & a.City)
Console.WriteLine(ControlChars.Tab & a.State)
Console.WriteLine(ControlChars.Tab & a.Zip)
Console.WriteLine()
End Sub
Private Sub serializer_UnknownNode(sender As Object, e As XmlNodeEventArgs)
Console.WriteLine(("Unknown Node:" & e.Name & ControlChars.Tab & e.Text))
End Sub
Private Sub serializer_UnknownAttribute(sender As Object, e As XmlAttributeEventArgs)
Dim attr As System.Xml.XmlAttribute = e.Attr
Console.WriteLine(("Unknown attribute " & attr.Name & "='" & attr.Value & "'"))
End Sub
End Class