SoapAttributes.SoapDefaultValue Eigenschaft
Definition
Wichtig
Einige Informationen beziehen sich auf Vorabversionen, die vor dem Release ggf. grundlegend überarbeitet werden. Microsoft übernimmt hinsichtlich der hier bereitgestellten Informationen keine Gewährleistungen, seien sie ausdrücklich oder konkludent.
Dient zum Abrufen oder Festlegen des Standardwerts eines XML-Elements oder -Attributs.
public:
property System::Object ^ SoapDefaultValue { System::Object ^ get(); void set(System::Object ^ value); };public object? SoapDefaultValue { get; set; }public object SoapDefaultValue { get; set; }member this.SoapDefaultValue : obj with get, setPublic Property SoapDefaultValue As ObjectEigenschaftswert
Ein Objekt, das den Standardwert eines XML-Elements oder -Attributs darstellt.
Beispiele
Im folgenden Beispiel wird eine Klasse mit dem Namen Group serialisiert, die ein Feld mit dem Namen GroupNameenthält. Der Standardwert wird auf DefaultValueAttribute ".NET" festgelegt. Durch das Festlegen des Felds oder durch Festlegen auf ".NET" wird der Wert nicht serialisiert (da der Standardwert bereits bekannt ist). Im Beispiel wird auch der Standardwert in der CreateOverrideSerializer Methode außer Kraft gesetzt, der von der SerializeOverride Methode aufgerufen wird. Im Beispiel werden sowohl Methoden SerializeOriginal als SerializeOverrideauch , und derselbe Wert (".NET") für das GroupName Feld aufgerufen. Aufgrund der Außerkraftsetzung wird der Wert nur beim Aufrufen der SerializeOverride Methode serialisiert.
using System;
using System.IO;
using System.Xml;
using System.Xml.Serialization;
using System.Xml.Schema;
using System.ComponentModel;
public class Group
{
// The default is set to .NET.
[DefaultValue(".NET")]
public string GroupName;
}
public class Run
{
public static void Main()
{
Run test = new Run();
test.SerializeOriginal("SoapOriginal.xml");
test.SerializeOverride("mySoapAttributeOverridesideAttributes.xml");
test.DeserializeOriginal("SoapOriginal.xml");
test.DeserializeOverride("mySoapAttributeOverridesideAttributes.xml");
}
public void SerializeOriginal(string filename)
{
// Create an instance of the XmlSerializer class.
XmlSerializer mySerializer =
new XmlSerializer(typeof(Group));
// Writing the file requires a TextWriter.
TextWriter writer = new StreamWriter(filename);
// Create an instance of the class that will be serialized.
Group myGroup = new Group();
// Setting the GroupName to '.NET' is like not setting it at all
// because it is the default value. So no value will be
// serialized, and on deserialization it will appear as a blank.
myGroup.GroupName = ".NET";
// Serialize the class, and close the TextWriter.
mySerializer.Serialize(writer, myGroup);
writer.Close();
}
public void SerializeOverride(string filename)
{
// Create an instance of the XmlSerializer class
// that overrides the serialization.
XmlSerializer overRideSerializer = CreateOverrideSerializer();
// Writing the file requires a TextWriter.
TextWriter writer = new StreamWriter(filename);
// Create an instance of the class that will be serialized.
Group myGroup = new Group();
// The override specifies that the default value is now
// 'Team1'. So setting the GroupName to '.NET' means
// the value will be serialized.
myGroup.GroupName = ".NET";
// Serialize the class, and close the TextWriter.
overRideSerializer.Serialize(writer, myGroup);
writer.Close();
}
public void DeserializeOriginal(string filename)
{
// Create an instance of the XmlSerializer class.
XmlSerializer mySerializer= new XmlSerializer(typeof(Group));
// Reading the file requires a TextReader.
TextReader reader = new StreamReader(filename);
// Deserialize and cast the object.
Group myGroup;
myGroup = (Group) mySerializer.Deserialize(reader);
Console.WriteLine(myGroup.GroupName);
Console.WriteLine();
}
public void DeserializeOverride(string filename)
{
// Create an instance of the XmlSerializer class.
XmlSerializer overRideSerializer = CreateOverrideSerializer();
// Reading the file requires a TextReader.
TextReader reader = new StreamReader(filename);
// Deserialize and cast the object.
Group myGroup;
myGroup = (Group) overRideSerializer.Deserialize(reader);
Console.WriteLine(myGroup.GroupName);
}
private XmlSerializer CreateOverrideSerializer()
{
SoapAttributeOverrides mySoapAttributeOverrides =
new SoapAttributeOverrides();
SoapAttributes soapAtts = new SoapAttributes();
// Create a new DefaultValueAttribute object for the GroupName
// property.
DefaultValueAttribute newDefault =
new DefaultValueAttribute("Team1");
soapAtts.SoapDefaultValue = newDefault;
mySoapAttributeOverrides.Add(typeof(Group), "GroupName",
soapAtts);
// Create an XmlTypeMapping that is used to create an instance
// of the XmlSerializer. Then return the XmlSerializer object.
XmlTypeMapping myMapping = (new SoapReflectionImporter(
mySoapAttributeOverrides)).ImportTypeMapping(typeof(Group));
XmlSerializer ser = new XmlSerializer(myMapping);
return ser;
}
}
Imports System.IO
Imports System.Xml
Imports System.Xml.Serialization
Imports System.Xml.Schema
Imports System.ComponentModel
Public Class Group
' The default is set to .NET.
<DefaultValue(".NET")> _
Public GroupName As String
End Class
Public Class Run
Public Shared Sub Main()
Dim test As Run = new Run()
test.SerializeOriginal("SoapOriginal.xml")
test.SerializeOverride _
("mySoapAttributeOverridesideAttributes.xml")
test.DeserializeOriginal("SoapOriginal.xml")
test.DeserializeOverride _
("mySoapAttributeOverridesideAttributes.xml")
End Sub
public Sub SerializeOriginal(filename As String)
' Create an instance of the XmlSerializer class.
Dim mySerializer As XmlSerializer = _
new XmlSerializer(GetType(Group))
' Writing the file requires a TextWriter.
Dim writer As TextWriter = new StreamWriter(filename)
' Create an instance of the class that will be serialized.
Dim myGroup As Group = new Group()
' Setting the GroupName to '.NET' is like not setting it at all
' because it is the default value. So no value will be
' serialized, and on deserialization it will appear as a blank.
myGroup.GroupName = ".NET"
' Serialize the class, and close the TextWriter.
mySerializer.Serialize(writer, myGroup)
writer.Close()
End Sub
Public Sub SerializeOverride(filename As String)
' Create an instance of the XmlSerializer class
' that overrides the serialization.
Dim overRideSerializer As XmlSerializer = CreateOverrideSerializer()
' Writing the file requires a TextWriter.
Dim writer As TextWriter = new StreamWriter(filename)
' Create an instance of the class that will be serialized.
Dim myGroup As Group = new Group()
' The override specifies that the default value is now
' 'Team1'. So setting the GroupName to '.NET' means
' the value will be serialized.
myGroup.GroupName = ".NET"
' Serialize the class, and close the TextWriter.
overRideSerializer.Serialize(writer, myGroup)
writer.Close()
End Sub
Public Sub DeserializeOriginal(filename As String)
' Create an instance of the XmlSerializer class.
Dim mySerializer As XmlSerializer = new XmlSerializer(GetType(Group))
' Reading the file requires a TextReader.
Dim reader As TextReader = new StreamReader(filename)
' Deserialize and cast the object.
Dim myGroup As Group = CType(mySerializer.Deserialize(reader), Group)
Console.WriteLine(myGroup.GroupName)
Console.WriteLine()
End Sub
Public Sub DeserializeOverride(filename As String)
' Create an instance of the XmlSerializer class.
Dim overRideSerializer As XmlSerializer = CreateOverrideSerializer()
' Reading the file requires a TextReader.
Dim reader As TextReader = new StreamReader(filename)
' Deserialize and cast the object.
Dim myGroup As Group = CType(overRideSerializer.Deserialize(reader), Group)
Console.WriteLine(myGroup.GroupName)
End Sub
Private Function CreateOverrideSerializer() As XmlSerializer
Dim mySoapAttributeOverrides As SoapAttributeOverrides = _
New SoapAttributeOverrides()
Dim soapAtts As SoapAttributes = New SoapAttributes()
' Create a new DefaultValueAttribute object for the GroupName
' property.
Dim newDefault As DefaultValueAttribute = _
new DefaultValueAttribute("Team1")
soapAtts.SoapDefaultValue = newDefault
mySoapAttributeOverrides.Add(GetType(Group), "GroupName", _
soapAtts)
' Create an XmlTypeMapping that is used to create an instance
' of the XmlSerializer. Then return the XmlSerializer object.
Dim myMapping As XmlTypeMapping = _
(New SoapReflectionImporter( _
mySoapAttributeOverrides)).ImportTypeMapping(GetType(Group))
Dim ser As XmlSerializer = new XmlSerializer(myMapping)
return ser
End Function
End Class
Hinweise
Der Standardwert eines Elements kann durch Anwenden eines DefaultValueAttribute Attributs auf das Element festgelegt werden. Wenn das Element als codierte SOAP-Nachricht serialisiert wird, können Sie den Standardwert ändern, indem Sie eine neue DefaultValueAttributeEigenschaft erstellen, dessen Value Eigenschaft festlegen und die SoapDefaultValue Eigenschaft auf das Objekt festlegen. Fügen Sie das Add-In SoapAttributes zu einem SoapAttributeOverrides. Weitere Details finden Sie in der SoapAttributeOverrides Klassenübersicht.
