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

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.NET Framework クラスライブラリリファレンス

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SocketPermission.IsSubsetOf メソッド

現在のアクセス許可が、指定したアクセス許可のサブセットかどうかを判断します。

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

Visual Basic (宣言)

Public Overrides Function
 IsSubsetOf ( _
    target As IPermission _
) As Boolean

Visual Basic (使用法)

Dim instance As SocketPermission
Dim target As IPermission
Dim returnValue As Boolean

returnValue = instance.IsSubsetOf(target)

public override bool IsSubsetOf (
    IPermission target
)

C++

public:
virtual bool IsSubsetOf (
    IPermission^ target
) override

public boolean IsSubsetOf (
    IPermission target
)

JScript

public override function IsSubsetOf (
    target : IPermission
) : boolean

パラメータ

target: サブセットの関係を調べる対象の SocketPermission。

戻り値
target が null 参照 (Visual Basic では Nothing) で、現在のインスタンスがアクセス許可を定義していない場合、このメソッドは true を返します。それ以外の場合は、false を返します。target が null 参照 (Visual Basic では Nothing) ではなく、現在のインスタンスが target のアクセス許可のサブセットを定義している場合は、true を返します。それ以外の場合は false を返します。

例外

例外の種類	条件
ArgumentException	target が SocketException ではありません。
SecurityException	DnsPermission が、メソッドの呼び出し側では付与されていません。

解説

現在のアクセス許可で指定される操作の集合が、指定したアクセス許可に完全に含まれる場合、現在のアクセス許可オブジェクトは指定したアクセス許可オブジェクトのサブセットです。

たとえば、192.168.1.1:80 へのアクセスを表すアクセス許可は、192.168.1.1:Any へのアクセスを表すアクセス許可のサブセットです。このメソッドが true を返す場合、現在のアクセス許可が保護されたリソースに対して表すアクセス権は、指定したアクセス許可が表すアクセス権と同じか、またはそのサブセットです

使用例

ある SocketPermission が他のサブセットかどうかを、IsSubsetOf メソッドを使用して確認する例を次に示します。

Visual Basic

' Creates a SocketPermission restricting access to and from all URIs.
Dim mySocketPermission1 As New
 SocketPermission(PermissionState.None)

' The socket to which this permission will apply will allow connections
 from www.contoso.com.
mySocketPermission1.AddPermission(NetworkAccess.Accept, TransportType.Tcp, "www.contoso.com",
 11000)

' Creates a SocketPermission which will allow the target Socket to connect
 with www.southridgevideo.com.
Dim mySocketPermission2 As New
 SocketPermission(NetworkAccess.Connect, TransportType.Tcp, "www.southridgevideo.com",
 11002)

' Creates a SocketPermission from the union of two SocketPermissions.
Dim mySocketPermissionUnion As SocketPermission
 = CType(mySocketPermission1.Union(mySocketPermission2), SocketPermission)

' Checks to see if the union was successfully created by using the IsSubsetOf
 method.
If mySocketPermission1.IsSubsetOf(mySocketPermissionUnion) And
 mySocketPermission2.IsSubsetOf(mySocketPermissionUnion) Then
   Console.WriteLine("This union contains permissions from both
 mySocketPermission1 and mySocketPermission2")
   
   ' Prints the allowable accept URIs to the console.
   Console.WriteLine("This union accepts connections on :")
   
   Dim myEnumerator As IEnumerator = mySocketPermissionUnion.AcceptList
   While myEnumerator.MoveNext()
      Console.WriteLine(CType(myEnumerator.Current, EndpointPermission).ToString())
   End While
   
   Console.WriteLine("This union establishes connections on :
 ")
   
   ' Prints the allowable connect URIs to the console.
   Console.WriteLine("This union permits connections to :")
   
   myEnumerator = mySocketPermissionUnion.ConnectList
   While myEnumerator.MoveNext()
      Console.WriteLine(CType(myEnumerator.Current, EndpointPermission).ToString())
   End While
End If

// Creates a SocketPermission restricting access to and from all URIs.
SocketPermission mySocketPermission1 = new SocketPermission(PermissionState.None);

// The socket to which this permission will apply will allow connections
 from www.contoso.com.
mySocketPermission1.AddPermission(NetworkAccess.Accept, TransportType.Tcp, "www.contoso.com",
 11000);

// Creates a SocketPermission which will allow the target Socket to
 connect with www.southridgevideo.com.
SocketPermission mySocketPermission2 =
                           new SocketPermission(NetworkAccess.Connect,
 TransportType.Tcp, "www.southridgevideo.com", 11002);

// Creates a SocketPermission from the union of two SocketPermissions.
SocketPermission mySocketPermissionUnion = 
                           (SocketPermission)mySocketPermission1.Union(mySocketPermission2);

// Checks to see if the union was successfully created by using the
 IsSubsetOf method.
if (mySocketPermission1.IsSubsetOf(mySocketPermissionUnion) &&
 
       mySocketPermission2.IsSubsetOf(mySocketPermissionUnion)){
     Console.WriteLine("This union contains permissions from both mySocketPermission1
 and mySocketPermission2"); 

     // Prints the allowable accept URIs to the console.
     Console.WriteLine("This union accepts connections on :");

     IEnumerator myEnumerator = mySocketPermissionUnion.AcceptList;
  while (myEnumerator.MoveNext()) {
          Console.WriteLine(((EndpointPermission)myEnumerator.Current).ToString());
       }      

        // Prints the allowable connect URIs to the console.
     Console.WriteLine("This union permits connections to :");

     myEnumerator = mySocketPermissionUnion.ConnectList;
  while (myEnumerator.MoveNext()) {
          Console.WriteLine(((EndpointPermission)myEnumerator.Current).ToString());
       }      

      }

C++

// Creates a SocketPermission restricting access to and from all URIs.
SocketPermission^ mySocketPermission1 = gcnew SocketPermission( PermissionState::None
 );

// The socket to which this permission will apply will allow connections
 from www.contoso.com.
mySocketPermission1->AddPermission( NetworkAccess::Accept, TransportType::Tcp,
  "www.contoso.com", 11000 );

// Creates a SocketPermission which will allow the target Socket to
 connect with www.southridgevideo.com.
SocketPermission^ mySocketPermission2 = gcnew SocketPermission( NetworkAccess::Connect,TransportType::Tcp,
 "www.southridgevideo.com",11002 );

// Creates a SocketPermission from the union of two SocketPermissions.
SocketPermission^ mySocketPermissionUnion =
   (SocketPermission^)( mySocketPermission1->Union( mySocketPermission2 ) );

// Checks to see if the union was successfully created by using the
 IsSubsetOf method.
if ( mySocketPermission1->IsSubsetOf( mySocketPermissionUnion
 ) &&
   mySocketPermission2->IsSubsetOf( mySocketPermissionUnion ) )
{
   Console::WriteLine(  "This union contains permissions from both mySocketPermission1
 and mySocketPermission2" );
   
   // Prints the allowable accept URIs to the console.
   Console::WriteLine(  "This union accepts connections on :" );

   IEnumerator^ myEnumerator = mySocketPermissionUnion->AcceptList;
   while ( myEnumerator->MoveNext() )
   {
      Console::WriteLine( safe_cast<EndpointPermission^>( myEnumerator->Current
 )->ToString() );
   }
   
   // Prints the allowable connect URIs to the console.
   Console::WriteLine(  "This union permits connections to :" );

   myEnumerator = mySocketPermissionUnion->ConnectList;
   while ( myEnumerator->MoveNext() )
   {
      Console::WriteLine( safe_cast<EndpointPermission^>( myEnumerator->Current
 )->ToString() );
   }
}

// Creates a SocketPermission restricting access to and from all URIs.
SocketPermission mySocketPermission1 
    = new SocketPermission(PermissionState.None);
// The socket to which this permission will apply will allow 
// connections from www.contoso.com.
mySocketPermission1.AddPermission(NetworkAccess.Accept, 
    TransportType.Tcp, "www.contoso.com", 11000);
// Creates a SocketPermission which will allow the target Socket to
 
// connect with www.southridgevideo.com.
SocketPermission mySocketPermission2 
    = new SocketPermission(NetworkAccess.Connect, 
    TransportType.Tcp, "www.southridgevideo.com", 11002);
// Creates a SocketPermission from the union of two SocketPermissions.
SocketPermission mySocketPermissionUnion 
    = (SocketPermission)mySocketPermission1.Union(mySocketPermission2);
// Checks to see if the union was successfully created by using the
 
// IsSubsetOf method.
if (mySocketPermission1.IsSubsetOf(mySocketPermissionUnion) 
    && mySocketPermission2.IsSubsetOf(mySocketPermissionUnion)) {
    Console.WriteLine("This union contains permissions from both "    
                             + "mySocketPermission1 and mySocketPermission2");
    // Prints the allowable accept URIs to the console.
    Console.WriteLine("This union accepts connections on :");

    IEnumerator myEnumerator = mySocketPermissionUnion.
        get_AcceptList();
    while (myEnumerator.MoveNext()) {
        Console.WriteLine(((EndpointPermission)myEnumerator.
            get_Current()).ToString());
    }
    // Prints the allowable connect URIs to the console.
    Console.WriteLine("This union permits connections to :");

    myEnumerator = mySocketPermissionUnion.get_ConnectList();
    while (myEnumerator.MoveNext()) {
        Console.WriteLine(((EndpointPermission)myEnumerator.
            get_Current()).ToString());
    }
}

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、1.1、1.0

参照

関連項目
SocketPermission クラス
SocketPermission メンバ
System.Net 名前空間

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SocketPermission.IsSubsetOf メソッドとは？ わかりやすく解説

SocketPermission.IsSubsetOf メソッド

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SocketPermission.IsSubsetOf メソッドとは？わかりやすく解説