X509Certificate2Collection.Item プロパティとは何？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

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X509Certificate2Collection.Item プロパティ

メモ : このプロパティは、.NET Framework version 2.0 で新しく追加されたものです。

指定したインデックスにある要素を取得または設定します。

名前空間: System.Security.Cryptography.X509Certificates
アセンブリ: System (system.dll 内)
構文

Visual Basic (宣言)

Public Default Property
 Item ( _
    index As Integer _
) As X509Certificate2

Visual Basic (使用法)

Dim instance As X509Certificate2Collection
Dim index As Integer
Dim value As X509Certificate2

value = instance(index)

instance(index) = value

public X509Certificate2 this [
    int index
] { get; set; }

C++

public:
property X509Certificate2^ default [int] {
    X509Certificate2^ get (int index);
    void set (int index,
 X509Certificate2^ value);
}

/** @property */
public X509Certificate2 get_Item (int index)

/** @property */
public void set_Item (int
 index, X509Certificate2 value)

JScript

JScript では、インデックス付きのプロパティは使用できますが、新規に宣言することはできません。.

パラメータ

index: 取得または設定する要素の、0 から始まるインデックス番号。

プロパティ値
指定したインデックスにある要素。

例外

例外の種類	条件
ArgumentOutOfRangeException	index が 0 未満です。または index が Count プロパティ以上です。
ArgumentNullException	index が null 参照 (Visual Basic では Nothing) です。

例外の種類

条件

ArgumentOutOfRangeException

index が 0 未満です。

または

index が Count プロパティ以上です。

ArgumentNullException

index が null 参照 (Visual Basic では Nothing) です。

解説

このプロパティでは、myCollection[index] という構文を使用して、コレクション内の特定の要素にアクセスできます。

使用例

現在のユーザーの個人用証明書ストアを開いて、有効な証明書だけを選択し、ユーザーが証明書を選択できるようにして、証明書および証明書チェーンの情報をコンソールに出力するコード例を次に示します。出力は、ユーザーが選択した証明書によって異なります。

using System;
using System.Security.Cryptography;
using System.Security.Permissions;
using System.IO;
using System.Security.Cryptography.X509Certificates;

class CertSelect
{
    static void Main()
    {
        try
        {
            X509Store store = new X509Store("MY",StoreLocation.CurrentUser);
            store.Open(OpenFlags.ReadOnly | OpenFlags.OpenExistingOnly);
            X509Certificate2Collection collection = (X509Certificate2Collection)store.Certificates;
            X509Certificate2Collection fcollection = (X509Certificate2Collection)collection.Find(X509FindType.FindByTimeValid
,DateTime.Now,false);
            X509Certificate2Collection scollection = X509Certificate2UI.SelectFromCollection(fcollection,
 "Test Certificate Select","Select a certificate from the following
 list to get information on that certificate",X509SelectionFlag.MultiSelection);
            Console.WriteLine("Number of certificates: {0}{1}",scollection.Count
,Environment.NewLine);
                foreach (X509Certificate2 x509 in
 scollection)
                {
                    byte[] rawdata = x509.RawData;
                    Console.WriteLine("Content Type: {0}{1}",X509Certificate2.GetCertContentType(rawdata)
,Environment.NewLine);
                    Console.WriteLine("Friendly Name: {0}{1}",x509.FriendlyName
,Environment.NewLine);
                    Console.WriteLine("Certificate Verified?: {0}{1}",x509.Verify()
,Environment.NewLine);
                    Console.WriteLine("Simple Name: {0}{1}",x509.GetNameInfo(X509NameType.SimpleName
,true),Environment.NewLine);
                    Console.WriteLine("Signature Algorithm: {0}{1}",x509.SignatureAlgorithm.FriendlyName
,Environment.NewLine);
                    Console.WriteLine("Private Key: {0}{1}",x509.PrivateKey.ToXmlString(false)
,Environment.NewLine);
                    Console.WriteLine("Public Key: {0}{1}",x509.PublicKey.Key.ToXmlString(false)
,Environment.NewLine);
                    Console.WriteLine("Certificate Archived?: {0}{1}",x509.Archived
,Environment.NewLine);
                    Console.WriteLine("Length of Raw Data: {0}{1}",x509.RawData.Length
,Environment.NewLine);
                    X509Certificate2UI.DisplayCertificate(x509);
                    x509.Reset();
                }
            store.Close();
            }
        catch (CryptographicException)
            {
                   Console.WriteLine("Information could not be written out for
 this certificate.");
            }
        
    }
}

C++

#using <System.dll>
#using <System.Security.dll>

using namespace System;
using namespace System::Security::Cryptography;
using namespace System::Security::Permissions;
using namespace System::IO;
using namespace System::Security::Cryptography::X509Certificates;
int main()
{
   try
   {
      X509Store ^ store = gcnew X509Store( "MY",StoreLocation::CurrentUser
 );
      store->Open( static_cast<OpenFlags>(OpenFlags::ReadOnly | OpenFlags::OpenExistingOnly)
 );
      X509Certificate2Collection ^ collection = dynamic_cast<X509Certificate2Collection^>(store->Certificates);
      X509Certificate2Collection ^ fcollection = dynamic_cast<X509Certificate2Collection^>(collection->Find(
 X509FindType::FindByTimeValid, DateTime::Now, false ));
      X509Certificate2Collection ^ scollection = X509Certificate2UI::SelectFromCollection(fcollection,
 "Test Certificate Select","Select a certificate from the following
 list to get information on that certificate",X509SelectionFlag::MultiSelection);
      Console::WriteLine( "Number of certificates: {0}{1}", scollection->Count,
 Environment::NewLine );
      System::Collections::IEnumerator^ myEnum = scollection->GetEnumerator();
      while ( myEnum->MoveNext() )
      {
         X509Certificate2 ^ x509 = safe_cast<X509Certificate2 ^>(myEnum->Current);
         array<Byte>^rawdata = x509->RawData;
         Console::WriteLine( "Content Type: {0}{1}", X509Certificate2::GetCertContentType(
 rawdata ), Environment::NewLine );
         Console::WriteLine( "Friendly Name: {0}{1}", x509->FriendlyName,
 Environment::NewLine );
         Console::WriteLine( "Certificate Verified?: {0}{1}", x509->Verify(),
 Environment::NewLine );
         Console::WriteLine( "Simple Name: {0}{1}", x509->GetNameInfo(
 X509NameType::SimpleName, true ), Environment::NewLine );
         Console::WriteLine( "Signature Algorithm: {0}{1}", x509->SignatureAlgorithm->FriendlyName,
 Environment::NewLine );
         Console::WriteLine( "Private Key: {0}{1}", x509->PrivateKey->ToXmlString(
 false ), Environment::NewLine );
         Console::WriteLine( "Public Key: {0}{1}", x509->PublicKey->Key->ToXmlString(
 false ), Environment::NewLine );
         Console::WriteLine( "Certificate Archived?: {0}{1}", x509->Archived,
 Environment::NewLine );
         Console::WriteLine( "Length of Raw Data: {0}{1}", x509->RawData->Length,
 Environment::NewLine );
         x509->Reset();
      }
      store->Close();
   }
   catch ( CryptographicException^ ) 
   {
      Console::WriteLine( "Information could not be written out for
 this certificate." );
   }

}

プラットフォーム

バージョン情報

.NET Framework
サポート対象 : 2.0

参照

関連項目
X509Certificate2Collection クラス
X509Certificate2Collection メンバ
System.Security.Cryptography.X509Certificates 名前空間

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X509Certificate2Collection.Item プロパティとは？ わかりやすく解説

X509Certificate2Collection.Item プロパティ

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X509Certificate2Collection.Item プロパティとは？わかりやすく解説