KnownTypeAttribute Constructores
Importante
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Inicializa una nueva instancia de la clase KnownTypeAttribute.
KnownTypeAttribute(String) |
Inicializa una nueva instancia de la clase KnownTypeAttribute con el nombre de un método que devuelve IEnumerable de tipos conocidos. |
KnownTypeAttribute(Type) |
Inicializa una nueva instancia de la clase KnownTypeAttribute con el tipo especificado. |
- Source:
- KnownTypeAttribute.cs
- Source:
- KnownTypeAttribute.cs
- Source:
- KnownTypeAttribute.cs
Inicializa una nueva instancia de la clase KnownTypeAttribute con el nombre de un método que devuelve IEnumerable de tipos conocidos.
public:
KnownTypeAttribute(System::String ^ methodName);
public KnownTypeAttribute (string methodName);
new System.Runtime.Serialization.KnownTypeAttribute : string -> System.Runtime.Serialization.KnownTypeAttribute
Public Sub New (methodName As String)
Parámetros
- methodName
- String
El nombre del método que devuelve una interfaz IEnumerable de tipos usados al serializar o deserializar datos.
Ejemplos
El ejemplo siguiente usa el parámetro methodName
para identificar un método en el tipo que contiene una matriz de los objetos 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
Comentarios
Este constructor usa un nombre de método que coincide con un método de la clase. El método devuelve IEnumerable<T> de objetos Type. Durante la serialización o la deserialización, los tipos encontrados en la colección se pueden usar dentro del tipo raíz al que se aplica el atributo.
Se aplica a
.NET 9 y otras versiones
Producto | Versiones |
---|---|
.NET | Core 1.0, Core 1.1, Core 2.0, Core 2.1, Core 2.2, Core 3.0, Core 3.1, 5, 6, 7, 8, 9 |
.NET Framework | 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1 |
.NET Standard | 2.0, 2.1 |
UWP | 10.0 |
- Source:
- KnownTypeAttribute.cs
- Source:
- KnownTypeAttribute.cs
- Source:
- KnownTypeAttribute.cs
Inicializa una nueva instancia de la clase KnownTypeAttribute con el tipo especificado.
public:
KnownTypeAttribute(Type ^ type);
public KnownTypeAttribute (Type type);
new System.Runtime.Serialization.KnownTypeAttribute : Type -> System.Runtime.Serialization.KnownTypeAttribute
Public Sub New (type As Type)
Parámetros
Ejemplos
El ejemplo siguiente muestra un tipo denominado Person
y un tipo denominado IDInformation
que deberá incluirse al serializar o deserializar.
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
Se aplica a
.NET 9 y otras versiones
Producto | Versiones |
---|---|
.NET | Core 1.0, Core 1.1, Core 2.0, Core 2.1, Core 2.2, Core 3.0, Core 3.1, 5, 6, 7, 8, 9 |
.NET Framework | 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1 |
.NET Standard | 2.0, 2.1 |
UWP | 10.0 |
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