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Showing content from https://learn.microsoft.com/en-us/dotnet/api/system.serializableattribute below:

SerializableAttribute Class (System) | Microsoft Learn

Indicates that a class can be serialized using binary or XML serialization. This class cannot be inherited.

public ref class SerializableAttribute sealed : Attribute

[System.AttributeUsage(System.AttributeTargets.Class | System.AttributeTargets.Delegate | System.AttributeTargets.Enum | System.AttributeTargets.Struct, Inherited=false)]
public sealed class SerializableAttribute : Attribute

[System.AttributeUsage(System.AttributeTargets.Class | System.AttributeTargets.Delegate | System.AttributeTargets.Enum | System.AttributeTargets.Struct, Inherited=false)]
[System.Runtime.InteropServices.ComVisible(true)]
public sealed class SerializableAttribute : Attribute

[<System.AttributeUsage(System.AttributeTargets.Class | System.AttributeTargets.Delegate | System.AttributeTargets.Enum | System.AttributeTargets.Struct, Inherited=false)>]
type SerializableAttribute = class
    inherit Attribute

[<System.AttributeUsage(System.AttributeTargets.Class | System.AttributeTargets.Delegate | System.AttributeTargets.Enum | System.AttributeTargets.Struct, Inherited=false)>]
[<System.Runtime.InteropServices.ComVisible(true)>]
type SerializableAttribute = class
    inherit Attribute

Public NotInheritable Class SerializableAttribute
Inherits Attribute

Inheritance

Attributes

The following example demonstrates SOAP serialization of an object that's marked with the SerializableAttribute attribute.

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

Apply the SerializableAttribute attribute to a type to indicate that instances of this type can be serialized using binary or XML serialization. The common language runtime throws SerializationException if any type in the graph of objects being serialized does not have the SerializableAttribute attribute applied.

Apply the SerializableAttribute attribute even if the class also implements the ISerializable interface to control the binary serialization process.

When you apply the SerializableAttribute attribute to a type, all private and public fields are serialized by default. You can control binary serialization more granularly by implementing the ISerializable interface to override the serialization process.

Or you can exclude fields from serialization by applying the NonSerializedAttribute attribute to the field. If a field of a binary-serializable type contains a pointer, a handle, or some other data structure that is specific to a particular environment, and cannot be meaningfully reconstituted in a different environment, then you might want to apply the NonSerializedAttribute attribute to that field.

For more information about using attributes, see Attributes. For more information about binary serialization, see System.Runtime.Serialization.

Note

This attribute does not apply to JSON serialization using System.Text.Json.

Maps a set of names to a corresponding set of dispatch identifiers.

Retrieves the type information for an object, which can be used to get the type information for an interface.

Retrieves the number of type information interfaces that an object provides (either 0 or 1).

Provides access to properties and methods exposed by an object.

• Attribute
• ISerializable
• NonSerializedAttribute
• Extending Metadata Using Attributes
• XML and SOAP Serialization

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