Export (0) Print
Expand All

IPermission::Intersect Method

Creates and returns a permission that is the intersection of the current permission and the specified permission.

Namespace:  System.Security
Assembly:  mscorlib (in mscorlib.dll)

IPermission^ Intersect(
	IPermission^ target
)

Parameters

target
Type: System.Security::IPermission

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

Return Value

Type: System.Security::IPermission
A new permission that represents the intersection of the current permission and the specified permission. This new permission is nullptr if the intersection is empty.

ExceptionCondition
ArgumentException

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

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.

The following statements are required to be true for all implementations of the Intersect method. X and Y represent IPermission object references that are not nullptr.

  • X.Intersect(X) returns a value equal to X.

  • X.Intersect(Y) returns the same value as Y.Intersect(X).

  • X.Intersect(nullptr) returns nullptr.

The following code example demonstrates implementing the Intersect method. This code example is part of a larger example provided for the IPermission class.

    // Return a new object that contains the intersection  
    // of 'this' and 'target'. 
public:
    virtual IPermission^ Intersect(IPermission^ target) override
    {
        // If 'target' is null, return null. 
        if (target == nullptr)
        {
            return nullptr;
        }

        // Both objects must be the same type.
        SoundPermission^ soundPerm = VerifyTypeMatch(target);

        // If 'this' and 'target' are unrestricted,  
        // return a new unrestricted permission. 
        if (specifiedAsUnrestricted && soundPerm->specifiedAsUnrestricted)
        {
            return Clone(true, SoundPermissionState::PlayAnySound);
        }

        // Calculate the intersected permissions.  
        // If there are none, return null.
        SoundPermissionState minimumPermission = (SoundPermissionState)
            Math::Min((int) stateFlags, (int) soundPerm->stateFlags);
        if ((int)minimumPermission == 0)
        {
            return nullptr;
        }

        // Return a new object with the intersected permission value. 
        return Clone(false, minimumPermission);
    }

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

.NET Framework

Supported in: 3.5, 3.0, 2.0, 1.1, 1.0

Community Additions

ADD
Show:
© 2014 Microsoft