KnownTypeAttribute Costruttori
Definizione
Importante
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Inizializza una nuova istanza della classe KnownTypeAttribute.
Overload
| KnownTypeAttribute(String) |
Inizializza una nuova istanza della classe KnownTypeAttribute con il nome di un metodo che restituisce un'interfaccia IEnumerable di tipi noti. |
| KnownTypeAttribute(Type) |
Inizializza una nuova istanza della classe KnownTypeAttribute con il tipo specificato. |
KnownTypeAttribute(String)
- Source:
- KnownTypeAttribute.cs
- Source:
- KnownTypeAttribute.cs
- Source:
- KnownTypeAttribute.cs
Inizializza una nuova istanza della classe KnownTypeAttribute con il nome di un metodo che restituisce un'interfaccia IEnumerable di tipi noti.
public:
KnownTypeAttribute(System::String ^ methodName);public KnownTypeAttribute (string methodName);new System.Runtime.Serialization.KnownTypeAttribute : string -> System.Runtime.Serialization.KnownTypeAttributePublic Sub New (methodName As String)Parametri
- methodName
- String
Il nome del metodo che restituisce un'interfaccia IEnumerable di tipi utilizzata durante la serializzazione o deserializzazione di dati.
Esempio
Nell'esempio seguente viene utilizzato il parametro methodName per identificare un metodo nel tipo che contiene una matrice di oggetti Type.
namespace KnownTypeAttributeExample
{
using System;
using System.Xml;
using System.Collections.Generic;
using System.Text;
using System.Runtime.Serialization;
using System.IO;
// The constructor names the method that returns an array
// of types that can be used during deserialization.
[KnownTypeAttribute("KnownTypes")]
[DataContract]
public class Employee
{
public Employee(string newFName, string newLName)
{
FirstName = newFName;
LastName = newLName;
}
[DataMember]
internal string FirstName;
[DataMember]
internal string LastName;
[DataMember]
internal int id;
[DataMember]
internal Manager Boss;
// This method returns the array of known types.
static Type[] KnownTypes()
{
return new Type[]{typeof(Manager), typeof(Employee)};
}
}
[DataContract]
public class Manager : Employee
{
// Call the base class's constructor.
public Manager(string newFName, string newLName)
: base(newFName, newLName)
{ }
[DataMember]
internal Employee[] Reports;
}
class Program
{
public static void Main()
{
try
{
Serialize("person1.xml");
Deserialize("person1.xml");
}
catch (SerializationException se)
{
Console.WriteLine("{0}: {1}",
se.Message, se.StackTrace);
}
finally
{
Console.WriteLine("Press Enter to exit....");
Console.ReadLine();
}
}
static void Serialize(string path)
{
Employee emp = new Employee("John", "Peoples");
emp.id = 3001;
Manager theBoss = new Manager("Michiyo", "Sato");
theBoss.id = 41;
emp.Boss = theBoss;
DataContractSerializer ser =
new DataContractSerializer(typeof(Employee));
FileStream fs =
new FileStream(path, FileMode.OpenOrCreate);
ser.WriteObject(fs, emp);
fs.Close();
}
static void Deserialize(string path)
{
DataContractSerializer ser =
new DataContractSerializer(typeof(Employee));
FileStream fs = new FileStream(path,
FileMode.Open);
Employee p = (Employee)ser.ReadObject(fs);
Console.WriteLine("{0} {1}, id:{2}", p.FirstName,
p.LastName, p.id);
fs.Close();
}
}
}
' The constructor names the method that returns an array
' of types that can be used during deserialization.
<KnownTypeAttribute("KnownTypes"), DataContract()> _
Public Class Employee
Public Sub New(ByVal newFName As String, ByVal newLName As String)
FirstName = newFName
LastName = newLName
End Sub
<DataMember()> _
Friend FirstName As String
<DataMember()> _
Friend LastName As String
<DataMember()> _
Friend id As Integer
<DataMember()> _
Friend Boss As Manager
' This method returns the array of known types.
Shared Function KnownTypes() As Type()
Return New Type() {GetType(Manager), GetType(Employee)}
End Function
End Class
<DataContract()> _
Public Class Manager
Inherits Employee
' Call the base class's constructor.
Public Sub New(ByVal newFName As String, ByVal newLName As String)
MyBase.New(newFName, newLName)
End Sub
<DataMember()> _
Friend Reports() As Employee
End Class
Class Program
Public Shared Sub Main()
Try
Serialize("person1.xml")
Deserialize("person1.xml")
Catch se As SerializationException
Console.WriteLine("{0}: {1}", se.Message, se.StackTrace)
Finally
Console.WriteLine("Press Enter to exit....")
Console.ReadLine()
End Try
End Sub
Shared Sub Serialize(ByVal path As String)
Dim emp As New Employee("John", "Peoples")
emp.id = 3001
Dim theBoss As New Manager("Michiyo", "Sato")
theBoss.id = 41
emp.Boss = theBoss
Dim ser As New DataContractSerializer(GetType(Employee))
Dim fs As New FileStream(path, FileMode.OpenOrCreate)
ser.WriteObject(fs, emp)
fs.Close()
End Sub
Shared Sub Deserialize(ByVal path As String)
Dim ser As New DataContractSerializer(GetType(Employee))
Dim fs As New FileStream(path, FileMode.Open)
Dim p As Employee = CType(ser.ReadObject(fs), Employee)
Console.WriteLine("{0} {1}, id:{2}", p.FirstName, p.LastName, p.id)
fs.Close()
End Sub
End Class
Commenti
Questo costruttore utilizza un nome di metodo che corrisponde a un metodo della classe. Il metodo restituisce un'interfaccia IEnumerable<T> di oggetti Type. Durante la serializzazione o deserializzazione, i tipi individuati nella raccolta possono essere utilizzati all'interno del tipo radice al quale è applicato l'attributo.
Si applica a
KnownTypeAttribute(Type)
- Source:
- KnownTypeAttribute.cs
- Source:
- KnownTypeAttribute.cs
- Source:
- KnownTypeAttribute.cs
Inizializza una nuova istanza della classe KnownTypeAttribute con il tipo specificato.
public:
KnownTypeAttribute(Type ^ type);public KnownTypeAttribute (Type type);new System.Runtime.Serialization.KnownTypeAttribute : Type -> System.Runtime.Serialization.KnownTypeAttributePublic Sub New (type As Type)Parametri
- type
- Type
Tipo Type che viene incluso come tipo noto quando si esegue la serializzazione o deserializzazione di dati.
Esempio
L'esempio seguente mostra un tipo denominato Person e un tipo denominato IDInformation che devono essere inclusi durante la serializzazione o deserializzazione.
using System;
using System.Collections.Generic;
using System.Collections;
using System.Text;
using System.IO;
using System.Runtime.Serialization;
namespace KnownTypeAttributeExample
{
class Program
{
static void Main(string[] args)
{
try
{
Serialize("KnownTypeAttributeExample.xml");
Deserialize("KnownTypeAttributeExample.xml");
// Run this twice. The second time, comment out the
// Serialize call and comment out the
// KnownTypeAttribute on the Person class. The
// deserialization will then fail.
}
catch (SerializationException exc)
{
Console.WriteLine("{0}: {1}", exc.Message,
exc.StackTrace);
}
finally
{
Console.WriteLine("Press Enter to exit...");
Console.ReadLine();
}
}
public static void Serialize(string path)
{
Person p = new Person();
p.Miscellaneous.Add(DateTime.Now, "Hello");
p.Miscellaneous.Add(DateTime.Now.AddSeconds(1), "World");
IDInformation w = new IDInformation();
w.ID = "1111 00000";
p.Miscellaneous.Add(DateTime.Now.AddSeconds(2), w);
DataContractSerializer ser =
new DataContractSerializer(typeof(Person));
FileStream fs = new FileStream(path, FileMode.Create);
using (fs)
{
ser.WriteObject(fs, p);
}
}
public static void Deserialize(string path)
{
DataContractSerializer ser =
new DataContractSerializer(typeof(Person));
FileStream fs = new FileStream(path, FileMode.Open);
using (fs)
{
Person p2 = (Person)ser.ReadObject(fs);
Console.WriteLine("Count {0}", p2.Miscellaneous.Count);
foreach (DictionaryEntry de in p2.Miscellaneous)
{
Console.WriteLine("Key {0} Value: {1}", de.Key,
de.Value);
if (de.Value.GetType() == typeof(IDInformation))
{
IDInformation www = (IDInformation)de.Value;
Console.WriteLine(
"\t Found ID Information. ID: {0} \n", www.ID);
}
}
}
}
// Apply the KnownTypeAttribute to the class that
// includes a member that returns a Hashtable.
[KnownType(typeof(IDInformation))]
[DataContract]
public class Person : IExtensibleDataObject
{
private ExtensionDataObject ExtensionDataObjectValue;
public ExtensionDataObject ExtensionData
{
get { return ExtensionDataObjectValue; }
set { ExtensionDataObjectValue = value; }
}
private Hashtable MiscellaneousValue = new Hashtable();
[DataMember]
public Hashtable Miscellaneous
{
get { return MiscellaneousValue; }
set { MiscellaneousValue = value; }
}
}
[DataContract]
public class IDInformation : IExtensibleDataObject
{
private ExtensionDataObject ExtensionDataValue;
public ExtensionDataObject ExtensionData
{
get { return ExtensionDataValue; }
set { ExtensionDataValue = value; }
}
[DataMember]
public string ID;
}
}
}
Imports System.Collections.Generic
Imports System.Collections
Imports System.Text
Imports System.IO
Imports System.Runtime.Serialization
Imports System.Xml
Class Program
Shared Sub Main(ByVal args() As String)
Try
Serialize("KnownTypeAttributeExample.xml")
Deserialize("KnownTypeAttributeExample.xml")
' Run this twice. The second time, comment out the
' Serialize call and comment out the
' KnownTypeAttribute on the Person class. The
' deserialization will then fail.
Catch exc As SerializationException
Console.WriteLine("{0}: {1}", exc.Message, exc.StackTrace)
Finally
Console.WriteLine("Press Enter to exit...")
Console.ReadLine()
End Try
End Sub
Public Shared Sub Serialize(ByVal path As String)
Dim p As New Person()
p.Miscellaneous.Add(DateTime.Now, "Hello")
p.Miscellaneous.Add(DateTime.Now.AddSeconds(1), "World")
Dim w As New IDInformation()
w.ID = "1111 00000"
p.Miscellaneous.Add(DateTime.Now.AddSeconds(2), w)
Dim ser As New DataContractserializer(GetType(Person))
Using fs As New FileStream(path, FileMode.OpenOrCreate)
ser.WriteObject(fs, p)
End Using
End Sub
Public Shared Sub Deserialize(ByVal path As String)
Dim ser As New DataContractserializer(GetType(Person))
Using fs As New FileStream(path, FileMode.OpenOrCreate)
Dim p2 As Person = ser.ReadObject(fs)
Console.WriteLine("Count {0}", p2.Miscellaneous.Count)
For Each de As DictionaryEntry In p2.Miscellaneous
Console.WriteLine("Key {0} Value: {1}", de.Key, _
de.Value)
If TypeOf (de.Value) Is IDInformation Then
Dim www As IDInformation = de.Value
Console.WriteLine( _
"Found ID Information. ID: {0}", www.ID)
End If
Next
End Using
End Sub
' Apply the KnownTypeAttribute to the class that
' includes a member that returns a Hashtable.
<System.Runtime.Serialization.KnownType(GetType(IDInformation))> _
<DataContract()> _
Public Class Person
Implements IExtensibleDataObject
Private MiscellaneousValue As New Hashtable()
Private ExtensionDataObjectValue As ExtensionDataObject
Public Property ExtensionData() As ExtensionDataObject _
Implements IExtensibleDataObject.ExtensionData
Get
Return ExtensionDataObjectValue
End Get
Set(ByVal value As ExtensionDataObject)
ExtensionDataObjectValue = value
End Set
End Property
<DataMember()> _
Public Property Miscellaneous() As Hashtable
Get
Return MiscellaneousValue
End Get
Set(ByVal value As Hashtable)
MiscellaneousValue = value
End Set
End Property
End Class
<DataContract()> _
Public Class IDInformation
Implements IExtensibleDataObject
Private ExtensionDataObjectValue As ExtensionDataObject
Public Property ExtensionData() As ExtensionDataObject _
Implements IExtensibleDataObject.ExtensionData
Get
Return ExtensionDataObjectValue
End Get
Set(ByVal value As ExtensionDataObject)
ExtensionDataObjectValue = value
End Set
End Property
<DataMember()> _
Public ID As String
End Class
End Class
Si applica a
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