FormatterServices.PopulateObjectMembers メソッドとは何？わかりやすく解説 Weblio辞書

.NET Framework クラスライブラリリファレンス

索引トップ用語の索引ランキング

FormatterServices.PopulateObjectMembers メソッド

指定したオブジェクトに、オブジェクトのデータ配列から抽出された各フィールドの値を設定します。

名前空間: System.Runtime.Serialization
アセンブリ: mscorlib (mscorlib.dll 内)
構文

Visual Basic (宣言)

Public Shared Function PopulateObjectMembers
 ( _
    obj As Object, _
    members As MemberInfo(), _
    data As Object() _
) As Object

Visual Basic (使用法)

Dim obj As Object
Dim members As MemberInfo()
Dim data As Object()
Dim returnValue As Object

returnValue = FormatterServices.PopulateObjectMembers(obj, members, data)

public static Object PopulateObjectMembers
 (
    Object obj,
    MemberInfo[] members,
    Object[] data
)

C++

public:
static Object^ PopulateObjectMembers (
    Object^ obj, 
    array<MemberInfo^>^ members, 
    array<Object^>^ data
)

public static Object PopulateObjectMembers
 (
    Object obj, 
    MemberInfo[] members, 
    Object[] data
)

JScript

public static function PopulateObjectMembers
 (
    obj : Object, 
    members : MemberInfo[], 
    data : Object[]
) : Object

パラメータ

obj

members

data

戻り値
新しく設定されたオブジェクト。

例外

例外の種類	条件
ArgumentNullException	obj、members、data の各パラメータが null 参照 (Visual Basic では Nothing) です。 members の要素が null 参照 (Visual Basic では Nothing) です。
ArgumentException	members の長さが data の長さと一致しません。
SerializationException	members の要素が FieldInfo のインスタンスではありません。
SecurityException	呼び出し元に、必要なアクセス許可がありません。

解説

data の要素が null 参照 (Visual Basic では Nothing) の場合、PopulateObjectMembers はそのフィールドに何も書き込みません。

使用例

Book クラスのインスタンスを作成し、そのインスタンスのフィールド値を設定する例を次に示します。このコードでは、次に GetSerializableMembers メソッドを使用して型情報を取得します。また、GetObjectData メソッドを使用して、インスタンスのデータをオブジェクトの配列にコピーします。さらに、GetSafeUninitializedObject メソッドを使用して、初期化前の状態に戻したクラスの新しいインスタンスを作成します。最後に、PopulateObjectMembers メソッドを使用して、1 つ目のインスタンスのデータを 2 つ目のインスタンスにコピーします。

Visual Basic

Imports System
Imports System.Collections
Imports System.Runtime.Serialization
Imports System.IO
Imports System.Reflection
Imports System.Security.Permissions

<Assembly: SecurityPermission(SecurityAction.RequestMinimum)> 

' The SerializableAttribute specifies that instances of the class 
' can be serialized by the BinaryFormatter or SoapFormatter.
<Serializable()> _
Class Book
    Public Title As String
    Public Author As String

    ' Constructor for setting new values.
    Public Sub New(ByVal
 newTitle As String, _
    ByVal newAuthor As String)
        Title = newTitle
        Author = newAuthor

    End Sub
End Class

<SecurityPermission(SecurityAction.Demand)> _
               Public NotInheritable Class
 Test

    Public Shared Sub Main()
        Try
            Run()
        Catch exc As System.Exception
            Console.WriteLine("{0}: {1}", _
            exc.Message, exc.StackTrace)
        Finally
            Console.WriteLine("Press <Enter> to exit....")
            Console.ReadLine()
        End Try

    End Sub


    Shared Sub Run()
        ' Create an instance of a Book class 
        ' with a title and author.
        Dim Book1 As New
 Book("Book Title 1", "Masato
 Kawai")

        ' Store data about the serializable members in a 
        ' MemberInfo array. The MemberInfo type holds 
        ' only type data, not instance data.
        Dim members As MemberInfo() = _
           FormatterServices.GetSerializableMembers(GetType(Book))

        ' Copy the data from the first book into an 
        ' array of objects.
        Dim data As Object()
 = _
            FormatterServices.GetObjectData(Book1, members)

        ' Create an uninitialized instance of the Book class.
        Dim Book1Copy As Book = _
        CType(FormatterServices.GetSafeUninitializedObject _
           (GetType(Book)), Book)

        ' Call the PopuluateObjectMembers to copy the
        ' data into the new Book instance.
        FormatterServices.PopulateObjectMembers _
        (Book1Copy, members, data)

        ' Print the data from the copy.
        Console.WriteLine("Title: {0}", Book1Copy.Title)
        Console.WriteLine("Author: {0}", Book1Copy.Author)

    End Sub

    ' A private constructor is good practice on
    ' a class containing only static methods.
    Private Sub New()

    End Sub
End Class

using System;
using System.Collections;
using System.Runtime.Serialization;
using System.IO;
using System.Reflection;
using System.Security.Permissions;

[assembly: SecurityPermission(SecurityAction.RequestMinimum)]
namespace Examples
{
    // The SerializableAttribute specifies that instances of the class
 
    // can be serialized by the BinaryFormatter or SoapFormatter.
    [Serializable]
    class Book
    {
        public string Title;
        public string Author;

        // Constructor for setting new values.
        public Book(string newTitle, string
 newAuthor)
        {
            Title = newTitle;
            Author = newAuthor;
        }
    }

    [SecurityPermission(SecurityAction.Demand)]
    public sealed class Test
    {
        public static void
 Main()
        {
            try
            {
                Run();
            }
            catch (System.Exception exc)
            {
                Console.WriteLine("{0}: {1}", exc.Message, exc.StackTrace);
            }
            finally
            {
                Console.WriteLine("Press <Enter> to exit....");
                Console.ReadLine();
            }
        }

        
        static void Run()
        {
            // Create an instance of a Book class 
            // with a title and author.
            Book Book1 = new Book("Book Title 1",
                "Masato Kawai");

            // Store data about the serializable members in a 
            // MemberInfo array. The MemberInfo type holds 
            // only type data, not instance data.
            MemberInfo[] members =
               FormatterServices.GetSerializableMembers
               (typeof(Book));

            // Copy the data from the first book into an 
            // array of objects.
            object[] data =
                FormatterServices.GetObjectData(Book1, members);

            // Create an uninitialized instance of the Book class.
            Book Book1Copy =
                (Book)FormatterServices.GetSafeUninitializedObject
                (typeof(Book));

            // Call the PopuluateObjectMembers to copy the
            // data into the new Book instance.
            FormatterServices.PopulateObjectMembers
                (Book1Copy, members, data);

            // Print the data from the copy.
            Console.WriteLine("Title: {0}", Book1Copy.Title);
            Console.WriteLine("Author: {0}", Book1Copy.Author);
        }
        // A private constructor is good practice on
        // a class containing only static methods.
        private Test() { }
    }
}