CodeAccessPermission.Intersect(IPermission) Method

Definition

Namespace:

System.Security

Assembly:

System.Security.Permissions.dll

Source:

CodeAccessPermission.cs

When implemented by a derived class, creates and returns a permission that is the intersection of the current permission and the specified permission.

C#

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

Parameters

target

IPermission

A permission to intersect with the current permission. It must be of the same type as the current permission.

Returns

IPermission

A new permission that represents the intersection of the current permission and the specified permission. This new permission is null if the intersection is empty.

Implements

Intersect(IPermission)

Exceptions

ArgumentException

The target parameter is not null and is not an instance of the same class as the current permission.

Examples

The following code example shows an override of the Intersect method. This code example is part of a larger example provided for the CodeAccessPermission class.

C#

        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;
        }

Remarks

The intersection of two permissions is a permission that describes the set of operations they both describe in common. Only a demand that passes both original permissions will pass the intersection.

Notes to Implementers

You must override this method in a derived class.

Applies to