NonSerializedAttribute Kelas

Definisi

public ref class NonSerializedAttribute sealed : Attribute

[System.AttributeUsage(System.AttributeTargets.Field, Inherited=false)]
public sealed class NonSerializedAttribute : Attribute

[System.AttributeUsage(System.AttributeTargets.Field, Inherited=true)]
public sealed class NonSerializedAttribute : Attribute

[System.AttributeUsage(System.AttributeTargets.Field, Inherited=false)]
[System.Runtime.InteropServices.ComVisible(true)]
public sealed class NonSerializedAttribute : Attribute

[<System.AttributeUsage(System.AttributeTargets.Field, Inherited=false)>]
type NonSerializedAttribute = class
    inherit Attribute

[<System.AttributeUsage(System.AttributeTargets.Field, Inherited=true)>]
type NonSerializedAttribute = class
    inherit Attribute

[<System.AttributeUsage(System.AttributeTargets.Field, Inherited=false)>]
[<System.Runtime.InteropServices.ComVisible(true)>]
type NonSerializedAttribute = class
    inherit Attribute

Public NotInheritable Class NonSerializedAttribute
Inherits Attribute

Warisan

Object

Attribute

NonSerializedAttribute

Atribut

AttributeUsageAttribute ComVisibleAttribute

Contoh

Contoh berikut menunjukkan serialisasi SOAP objek yang ditandai dengan SerializableAttribute atribut , dan perilaku bidang yang ditandai dengan NonSerializedAttribute dalam objek yang diserialisasikan.

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

public class Test {
   public static void Main()  {

      // Creates a new TestSimpleObject object.
      TestSimpleObject obj = new TestSimpleObject();

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

      // Opens a file and serializes the object into it in binary format.
      Stream stream = File.Open("data.xml", FileMode.Create);
      SoapFormatter formatter = new SoapFormatter();

      formatter.Serialize(stream, obj);
      stream.Close();

      // Empties obj.
      obj = null;

      // Opens file "data.xml" and deserializes the object from it.
      stream = File.Open("data.xml", FileMode.Open);
      formatter = new SoapFormatter();

      obj = (TestSimpleObject)formatter.Deserialize(stream);
      stream.Close();

      Console.WriteLine("");
      Console.WriteLine("After deserialization the object contains: ");
      obj.Print();
   }
}

// A test object that needs to be serialized.
[Serializable()]
public class TestSimpleObject  {

    public int member1;
    public string member2;
    public string member3;
    public double member4;

    // A field that is not serialized.
    [NonSerialized()] public string member5;

    public TestSimpleObject() {

        member1 = 11;
        member2 = "hello";
        member3 = "hello";
        member4 = 3.14159265;
        member5 = "hello world!";
    }

    public void Print() {

        Console.WriteLine("member1 = '{0}'", member1);
        Console.WriteLine("member2 = '{0}'", member2);
        Console.WriteLine("member3 = '{0}'", member3);
        Console.WriteLine("member4 = '{0}'", member4);
        Console.WriteLine("member5 = '{0}'", member5);
    }
}

open System
open System.IO
open System.Runtime.Serialization.Formatters.Soap

// A test object that needs to be serialized.
[<Serializable>]
type TestSimpleObject() =
    let member1 = 11
    let member2 = "hello"
    let member3 = "hello"
    let member4 = 3.14159265

    // A field that is not serialized.
    [<NonSerialized>]
    let member5 = "hello world!"

    member _.Print() =
        printfn $"member1 = '{member1}'"
        printfn $"member2 = '{member2}'"
        printfn $"member3 = '{member3}'"
        printfn $"member4 = '{member4}'"
        printfn $"member5 = '{member5}'"

[<EntryPoint>]
let main _ =
    // Creates a new TestSimpleObject object.
    let obj = TestSimpleObject()

    printfn "Before serialization the object contains: "
    obj.Print()

    // Opens a file and serializes the object into it in binary format.
    let stream = File.Open("data.xml", FileMode.Create)
    let formatter = SoapFormatter()

    formatter.Serialize(stream, obj)
    stream.Close()

    // Opens file "data.xml" and deserializes the object from it.
    let stream = File.Open("data.xml", FileMode.Open)
    let formatter = new SoapFormatter()

    let obj = formatter.Deserialize stream :?> TestSimpleObject
    stream.Close()

    printfn "\nAfter deserialization the object contains: "
    obj.Print()
    0

Imports System.IO
Imports System.Runtime.Serialization
Imports System.Runtime.Serialization.Formatters.Soap




Public Class Test
   
   Public Shared Sub Main()
      
      ' Creates a new TestSimpleObject object.
      Dim obj As New TestSimpleObject()
      
      Console.WriteLine("Before serialization the object contains: ")
      obj.Print()
      
      ' Opens a file and serializes the object into it in binary format.
      Dim stream As Stream = File.Open("data.xml", FileMode.Create)
      Dim formatter As New SoapFormatter()
      


      formatter.Serialize(stream, obj)
      stream.Close()
      
      ' Empties obj.
      obj = Nothing
      
      ' Opens file "data.xml" and deserializes the object from it.
      stream = File.Open("data.xml", FileMode.Open)
      formatter = New SoapFormatter()



      obj = CType(formatter.Deserialize(stream), TestSimpleObject)
      stream.Close()
      
      Console.WriteLine("")
      Console.WriteLine("After deserialization the object contains: ")
      obj.Print()

   End Sub

End Class


' A test object that needs to be serialized.
<Serializable()> Public Class TestSimpleObject
   
   Public member1 As Integer
   Public member2 As String
   Public member3 As String
   Public member4 As Double
   
   ' A member that is not serialized.
   <NonSerialized()> Public member5 As String  
  
   
   Public Sub New()     
      member1 = 11
      member2 = "hello"
      member3 = "hello"
      member4 = 3.14159265
      member5 = "hello world!"
   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)
      Console.WriteLine("member5 = '{0}'", member5)
   End Sub

End Class

Keterangan

Saat menggunakan BinaryFormatter kelas atau SoapFormatter untuk menserialisasikan objek, gunakan NonSerializedAttribute atribut untuk mencegah bidang diserialisasikan. Misalnya, Anda dapat menggunakan atribut ini untuk mencegah serialisasi data sensitif.

Objek target untuk NonSerializedAttribute atribut adalah bidang publik dan privat dari kelas yang dapat diserialisasikan. Secara default, kelas tidak dapat diserialisasikan kecuali ditandai dengan SerializableAttribute. Selama proses serialisasi, semua bidang publik dan privat kelas diserialisasikan secara default. Bidang yang ditandai dengan NonSerializedAttribute dikecualikan selama serialisasi. Jika Anda menggunakan XmlSerializer kelas untuk membuat serialisasi objek, gunakan XmlIgnoreAttribute kelas untuk mendapatkan fungsionalitas yang sama. Atau, terapkan ISerializable antarmuka untuk mengontrol proses serialisasi secara eksplisit. Perhatikan bahwa kelas yang menerapkan ISerializable masih harus ditandai dengan SerializableAttribute.

Untuk menerapkan kelas ke NonSerializedAttribute peristiwa, atur lokasi atribut ke bidang, seperti yang ditunjukkan dalam kode C# berikut.

[field:NonSerializedAttribute()]
public event ChangedEventHandler Changed;

Jika bidang tidak diserialisasikan, tetapi masih memerlukan nilai default yang harus disediakan setelah deserialisasi, Anda dapat membuat metode yang menyediakan bidang dengan nilai, lalu menerapkannya OnDeserializedAttribute ke metode .

Untuk informasi selengkapnya tentang menggunakan atribut, lihat Atribut.

Lihat juga

• SerializableAttribute
• Attribute
• ISerializable
• Memperluas Metadata Menggunakan Atribut
• Serialisasi XML dan SOAP