CodeAccessPermission.Intersect(IPermission) 方法

定義

命名空間:

System.Security

組件:

System.Security.Permissions.dll

套件:

System.Security.Permissions v8.0.0

來源:

CodeAccessPermission.cs

當由衍生類別實作時，建立並傳回目前使用權限和指定使用權限交集的使用權限。

public:
 abstract System::Security::IPermission ^ Intersect(System::Security::IPermission ^ target);

public abstract System.Security.IPermission Intersect (System.Security.IPermission target);

abstract member Intersect : System.Security.IPermission -> System.Security.IPermission

Public MustOverride Function Intersect (target As IPermission) As IPermission

參數

target

IPermission

要與目前權限產生交集的權限。 必須與目前權限屬於相同的類型。

傳回

IPermission

新使用權限，表示目前使用權限和指定使用權限的交集。 如果交集是空的，這個新權限就是 null。

實作

Intersect(IPermission)

例外狀況

ArgumentException

target 參數不是 null，而且執行個體與目前權限屬於不同類別。

範例

下列程式碼範例示範 方法的 Intersect 覆寫。 此程式碼範例是提供給 類別之較大範例的 CodeAccessPermission 一部分。

public:
   virtual IPermission^ Intersect( IPermission^ target ) override
   {
      Console::WriteLine( "************* Entering Intersect *********************" );
      if ( target == nullptr )
      {
         return nullptr;
      }

#if ( debug ) 
      Console::WriteLine( "This is = {0}", ((NameIdPermission)this).Name );
      Console::WriteLine( "Target is {0}", ((NameIdPermission)target).m_Name );
#endif 

      if (  !VerifyType( target ) )
      {
         throw gcnew ArgumentException( String::Format( "Argument is wrong type.", this->GetType()->FullName ) );
      }

      NameIdPermission^ operand = dynamic_cast<NameIdPermission^>(target);

      if ( operand->IsSubsetOf( this ) )
      {
         return operand->Copy();
      }
      else if ( this->IsSubsetOf( operand ) )
      {
         return this->Copy();
      }
      else
      {
         return nullptr;
      }
   }

        public override IPermission Intersect(IPermission target)
        {
            Console.WriteLine ("************* Entering Intersect *********************");
            if (target == null)
            {
                return null;
            }
#if(debug)
            Console.WriteLine ("This is = " + (( NameIdPermission)this).Name);
            Console.WriteLine ("Target is " + (( NameIdPermission)target).m_Name);
#endif
            if (!VerifyType(target))
            {
                throw new ArgumentException (String.Format ("Argument is wrong type.", this.GetType ().FullName));
            }

             NameIdPermission operand = ( NameIdPermission)target;

            if (operand.IsSubsetOf (this)) return operand.Copy ();
            else if (this.IsSubsetOf (operand)) return this.Copy ();
            else
                return null;
        }

        Public Overrides Function Intersect(ByVal target As IPermission) As IPermission
            Console.WriteLine("************* Entering Intersect *********************")
            If target Is Nothing Then
                Return Nothing
            End If
#If (Debug) Then

            Console.WriteLine(("This is = " + CType(Me, NameIdPermission).Name))
            Console.WriteLine(("Target is " + CType(target, NameIdPermission).m_name))
#End If
            If Not VerifyType(target) Then
                Throw New ArgumentException(String.Format("Argument is wrong type.", Me.GetType().FullName))
            End If

            Dim operand As NameIdPermission = CType(target, NameIdPermission)

            If operand.IsSubsetOf(Me) Then
                Return operand.Copy()
            ElseIf Me.IsSubsetOf(operand) Then
                Return Me.Copy()
            Else
                Return Nothing
            End If
        End Function 'Intersect

備註

兩個許可權的交集是描述兩者共同描述之作業集的許可權。 只有傳遞兩個原始許可權的要求才會通過交集。

給實施者的注意事項

您必須覆寫衍生類別中的這個方法。