OnDeserializedAttribute 클래스

정의

메서드에 적용될 때 메서드는 개체 그래프의 개체가 deserialization 후 즉시 호출되도록 지정합니다. 그래프에 있는 다른 개체에 상대적인 역직렬화의 순서는 명확하지 않습니다.

public ref class OnDeserializedAttribute sealed : Attribute
[System.AttributeUsage(System.AttributeTargets.Method, Inherited=false)]
public sealed class OnDeserializedAttribute : Attribute
[System.AttributeUsage(System.AttributeTargets.Method, Inherited=false)]
[System.Runtime.InteropServices.ComVisible(true)]
public sealed class OnDeserializedAttribute : Attribute
[<System.AttributeUsage(System.AttributeTargets.Method, Inherited=false)>]
type OnDeserializedAttribute = class
    inherit Attribute
[<System.AttributeUsage(System.AttributeTargets.Method, Inherited=false)>]
[<System.Runtime.InteropServices.ComVisible(true)>]
type OnDeserializedAttribute = class
    inherit Attribute
Public NotInheritable Class OnDeserializedAttribute
Inherits Attribute
상속
OnDeserializedAttribute
특성

예제

다음 예제에서는 클래스의 메서드에 OnDeserializedAttribute, OnSerializedAttributeOnSerializingAttributeOnDeserializingAttribute 특성을 적용합니다.

using System;
using System.IO;
using System.Runtime.Serialization;
using System.Runtime.Serialization.Formatters.Binary;

public class Test
{
    public static void Main()
    {
        // Create a new TestSimpleObject object.
        TestSimpleObject obj = new TestSimpleObject();

        Console.WriteLine("\n Before serialization the object contains: ");
        obj.Print();

        // Open a file and serialize the object into binary format.
        Stream stream = File.Open("DataFile.dat", FileMode.Create);
        BinaryFormatter formatter = new BinaryFormatter();

        try
        {
            formatter.Serialize(stream, obj);

            // Print the object again to see the effect of the 
            //OnSerializedAttribute.
            Console.WriteLine("\n After serialization the object contains: ");
            obj.Print();

            // Set the original variable to null.
            obj = null;
            stream.Close();

            // Open the file "DataFile.dat" and deserialize the object from it.
            stream = File.Open("DataFile.dat", FileMode.Open);

            // Deserialize the object from the data file.
            obj = (TestSimpleObject)formatter.Deserialize(stream);

            Console.WriteLine("\n After deserialization the object contains: ");
            obj.Print();
            Console.ReadLine();
        }
        catch (SerializationException se)
        {
            Console.WriteLine("Failed to serialize. Reason: " + se.Message);
            throw;
        }
        catch (Exception exc)
        {
            Console.WriteLine("An exception occurred. Reason: " + exc.Message);
            throw;
        }
        finally
        {
            stream.Close();
            obj = null;
            formatter = null;
        }
    }
}

// This is the object that will be serialized and deserialized.
[Serializable()]
public class TestSimpleObject
{
    // This member is serialized and deserialized with no change.
    public int member1;

    // The value of this field is set and reset during and 
    // after serialization.
    private string member2;

    // This field is not serialized. The OnDeserializedAttribute 
    // is used to set the member value after serialization.
    [NonSerialized()]
    public string member3;

    // This field is set to null, but populated after deserialization.
    private string member4;

    // Constructor for the class.
    public TestSimpleObject()
    {
        member1 = 11;
        member2 = "Hello World!";
        member3 = "This is a nonserialized value";
        member4 = null;
    }

    public void Print()
    {
        Console.WriteLine("member1 = '{0}'", member1);
        Console.WriteLine("member2 = '{0}'", member2);
        Console.WriteLine("member3 = '{0}'", member3);
        Console.WriteLine("member4 = '{0}'", member4);
    }

    [OnSerializing()]
    internal void OnSerializingMethod(StreamingContext context)
    {
        member2 = "This value went into the data file during serialization.";
    }

    [OnSerialized()]
    internal void OnSerializedMethod(StreamingContext context)
    {
        member2 = "This value was reset after serialization.";
    }

    [OnDeserializing()]
    internal void OnDeserializingMethod(StreamingContext context)
    {
        member3 = "This value was set during deserialization";
    }

    [OnDeserialized()]
    internal void OnDeserializedMethod(StreamingContext context)
    {
        member4 = "This value was set after deserialization.";
    }
}

// Output:
//  Before serialization the object contains: 
// member1 = '11'
// member2 = 'Hello World!'
// member3 = 'This is a nonserialized value'
// member4 = ''
//
//  After serialization the object contains: 
// member1 = '11'
// member2 = 'This value was reset after serialization.'
// member3 = 'This is a nonserialized value'
// member4 = ''
//
//  After deserialization the object contains: 
// member1 = '11'
// member2 = 'This value went into the data file during serialization.'
// member3 = 'This value was set during deserialization'
// member4 = 'This value was set after deserialization.'
Imports System.IO
Imports System.Runtime.Serialization
Imports System.Runtime.Serialization.Formatters.Binary

Public Class Test
    Public Shared Sub Main()
        ' Create a new TestSimpleObject object.
        Dim obj As New TestSimpleObject()

        Console.WriteLine(vbLf + " Before serialization the object contains: ")
        obj.Print()

        ' Open a file and serialize the object into binary format.
        Dim stream As Stream = File.Open("DataFile.dat", FileMode.Create)
        Dim formatter As New BinaryFormatter()

        Try
            formatter.Serialize(stream, obj)

            ' Print the object again to see the effect of the 
            'OnSerializedAttribute.
            Console.WriteLine(vbLf + " After serialization the object contains: ")
            obj.Print()

            ' Set the original variable to null.
            obj = Nothing
            stream.Close()

            ' Open the file "DataFile.dat" and deserialize the object from it.
            stream = File.Open("DataFile.dat", FileMode.Open)

            ' Deserialize the object from the data file.
            obj = CType(formatter.Deserialize(stream), TestSimpleObject)

            Console.WriteLine(vbLf + " After deserialization the object contains: ")
            obj.Print()
            Console.ReadLine()
        Catch se As SerializationException
            Console.WriteLine("Failed to serialize. Reason: " + se.Message)
            Throw
        Catch exc As Exception
            Console.WriteLine("An exception occurred. Reason: " + exc.Message)
            Throw
        Finally
            stream.Close()
            obj = Nothing
            formatter = Nothing
        End Try
    End Sub
End Class


' This is the object that will be serialized and deserialized.
<Serializable()> _
Public Class TestSimpleObject
    ' This member is serialized and deserialized with no change.
    Public member1 As Integer

    ' The value of this field is set and reset during and 
    ' after serialization.
    Private member2 As String

    ' This field is not serialized. The OnDeserializedAttribute 
    ' is used to set the member value after serialization.
    <NonSerialized()> _
    Public member3 As String

    ' This field is set to null, but populated after deserialization.
    Private member4 As String

    ' Constructor for the class.
    Public Sub New()
        member1 = 11
        member2 = "Hello World!"
        member3 = "This is a nonserialized value"
        member4 = Nothing
    End Sub

    Public Sub Print()
        Console.WriteLine("member1 = '{0}'", member1)
        Console.WriteLine("member2 = '{0}'", member2)
        Console.WriteLine("member3 = '{0}'", member3)
        Console.WriteLine("member4 = '{0}'", member4)
    End Sub

    <OnSerializing()> _
    Friend Sub OnSerializingMethod(ByVal context As StreamingContext)
        member2 = "This value went into the data file during serialization."
    End Sub

    <OnSerialized()> _
    Friend Sub OnSerializedMethod(ByVal context As StreamingContext)
        member2 = "This value was reset after serialization."
    End Sub

    <OnDeserializing()> _
    Friend Sub OnDeserializingMethod(ByVal context As StreamingContext)
        member3 = "This value was set during deserialization"
    End Sub

    <OnDeserialized()> _
    Friend Sub OnDeserializedMethod(ByVal context As StreamingContext)
        member4 = "This value was set after deserialization."
    End Sub
End Class

' Output:
'  Before serialization the object contains: 
' member1 = '11'
' member2 = 'Hello World!'
' member3 = 'This is a nonserialized value'
' member4 = ''
'
'  After serialization the object contains: 
' member1 = '11'
' member2 = 'This value was reset after serialization.'
' member3 = 'This is a nonserialized value'
' member4 = ''
'
'  After deserialization the object contains: 
' member1 = '11'
' member2 = 'This value went into the data file during serialization.'
' member3 = 'This value was set during deserialization'
' member4 = 'This value was set after deserialization.'

설명

OnDeserializedAttribute 역직렬화된 개체가 역직렬화된 후 그래프가 반환되기 전에 값을 수정해야 하는 경우를 사용합니다. 이 특성은 인터페이스 대신 IDeserializationCallback 사용할 수 있습니다.

이 메서드를 OnDeserializedAttribute사용하려면 메서드에 매개 변수가 StreamingContext 포함되어야 합니다. 이 특성은 serialization 인프라에서 호출할 메서드를 표시하고 StreamingContext 진행 중인 serialization 형식에 대한 추가 데이터를 제공합니다. 사용법은 다음 코드에 나와 있습니다.

[OnDeserialized]
private void SetValuesOnDeserialized(StreamingContext context)
{
    // Code not shown.
}
<OnDeserialized()> _
Private Sub SetValuesOnDeserialized(ByVal context As StreamingContext)
    ' Code not shown.
End Sub

참고

코드에서 더 긴 OnDeserializedAttribute단어 대신 단어를 OnDeserialized 사용할 수 있습니다.

생성자

OnDeserializedAttribute()

OnDeserializedAttribute 클래스의 새 인스턴스를 초기화합니다.

속성

TypeId

파생 클래스에서 구현된 경우 이 Attribute에 대한 고유 식별자를 가져옵니다.

(다음에서 상속됨 Attribute)

메서드

Equals(Object)

이 인스턴스가 지정된 개체와 같은지를 나타내는 값을 반환합니다.

(다음에서 상속됨 Attribute)
GetHashCode()

이 인스턴스의 해시 코드를 반환합니다.

(다음에서 상속됨 Attribute)
GetType()

현재 인스턴스의 Type을 가져옵니다.

(다음에서 상속됨 Object)
IsDefaultAttribute()

파생 클래스에서 재정의된 경우 이 인스턴스 값이 파생 클래스에 대한 기본값인지 여부를 표시합니다.

(다음에서 상속됨 Attribute)
Match(Object)

파생 클래스에서 재정의된 경우 이 인스턴스가 지정된 개체와 같은지 여부를 나타내는 값을 반환합니다.

(다음에서 상속됨 Attribute)
MemberwiseClone()

현재 Object의 단순 복사본을 만듭니다.

(다음에서 상속됨 Object)
ToString()

현재 개체를 나타내는 문자열을 반환합니다.

(다음에서 상속됨 Object)

명시적 인터페이스 구현

_Attribute.GetIDsOfNames(Guid, IntPtr, UInt32, UInt32, IntPtr)

이름 집합을 해당하는 디스패치 식별자 집합에 매핑합니다.

(다음에서 상속됨 Attribute)
_Attribute.GetTypeInfo(UInt32, UInt32, IntPtr)

인터페이스의 형식 정보를 가져오는 데 사용할 수 있는 개체의 형식 정보를 검색합니다.

(다음에서 상속됨 Attribute)
_Attribute.GetTypeInfoCount(UInt32)

개체에서 제공하는 형식 정보 인터페이스의 수를 검색합니다(0 또는 1).

(다음에서 상속됨 Attribute)
_Attribute.Invoke(UInt32, Guid, UInt32, Int16, IntPtr, IntPtr, IntPtr, IntPtr)

개체에서 노출하는 메서드와 속성에 대한 액세스를 제공합니다.

(다음에서 상속됨 Attribute)

적용 대상

추가 정보