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EnvironmentPermission Class

.NET Framework 4

Controls access to system and user environment variables. This class cannot be inherited.

System.Object
  System.Security.CodeAccessPermission
    System.Security.Permissions.EnvironmentPermission

Namespace:  System.Security.Permissions
Assembly:  mscorlib (in mscorlib.dll)
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[SerializableAttribute]
[ComVisibleAttribute(true)]
public sealed class EnvironmentPermission : CodeAccessPermission, 
	IUnrestrictedPermission

The EnvironmentPermission type exposes the following members.

  Name Description
Public method EnvironmentPermission(PermissionState) Initializes a new instance of the EnvironmentPermission class with either restricted or unrestricted permission as specified.
Public method EnvironmentPermission(EnvironmentPermissionAccess, String) Initializes a new instance of the EnvironmentPermission class with the specified access to the specified environment variables.
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  Name Description
Public method AddPathList Adds access for the specified environment variables to the existing state of the permission.
Public method Assert Declares that the calling code can access the resource protected by a permission demand through the code that calls this method, even if callers higher in the stack have not been granted permission to access the resource. Using Assert can create security issues. (Inherited from CodeAccessPermission.)
Public method Copy Creates and returns an identical copy of the current permission. (Overrides CodeAccessPermission.Copy().)
Public method Demand Forces a SecurityException at run time if all callers higher in the call stack have not been granted the permission specified by the current instance. (Inherited from CodeAccessPermission.)
Public method Deny Obsolete. Prevents callers higher in the call stack from using the code that calls this method to access the resource specified by the current instance. (Inherited from CodeAccessPermission.)
Public method Equals Determines whether the specified CodeAccessPermission object is equal to the current CodeAccessPermission. (Inherited from CodeAccessPermission.)
Protected method Finalize Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.)
Public method FromXml Reconstructs a permission with a specified state from an XML encoding. (Overrides CodeAccessPermission.FromXml(SecurityElement).)
Public method GetHashCode Gets a hash code for the CodeAccessPermission object that is suitable for use in hashing algorithms and data structures such as a hash table. (Inherited from CodeAccessPermission.)
Public method GetPathList Gets all environment variables with the specified EnvironmentPermissionAccess.
Public method GetType Gets the Type of the current instance. (Inherited from Object.)
Public method Intersect Creates and returns a permission that is the intersection of the current permission and the specified permission. (Overrides CodeAccessPermission.Intersect(IPermission).)
Public method IsSubsetOf Determines whether the current permission is a subset of the specified permission. (Overrides CodeAccessPermission.IsSubsetOf(IPermission).)
Public method IsUnrestricted Returns a value indicating whether the current permission is unrestricted.
Protected method MemberwiseClone Creates a shallow copy of the current Object. (Inherited from Object.)
Public method PermitOnly Prevents callers higher in the call stack from using the code that calls this method to access all resources except for the resource specified by the current instance. (Inherited from CodeAccessPermission.)
Public method SetPathList Sets the specified access to the specified environment variables to the existing state of the permission.
Public method ToString Creates and returns a string representation of the current permission object. (Inherited from CodeAccessPermission.)
Public method ToXml Creates an XML encoding of the permission and its current state. (Overrides CodeAccessPermission.ToXml().)
Public method Union Creates a permission that is the union of the current permission and the specified permission. (Overrides CodeAccessPermission.Union(IPermission).)
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Environment variable names are designated by one or more case-insensitive name lists separated by semicolons, with separate lists for read and write access to the named variables. Write access includes the ability to create and delete environment variables as well as to change existing values.

Note Note

In versions of the .NET Framework before the .NET Framework version 4, you could use the CodeAccessPermission.Deny method to prevent inadvertent access to system resources by trusted code. Deny is now obsolete, and access to resources is now determined solely by the granted permission set for an assembly. To limit access to files, you must run partially trusted code in a sandbox and assign it permissions only to resources that the code is allowed to access. For information about running an application in a sandbox, see How to: Run Partially Trusted Code in a Sandbox.

.NET Framework

Supported in: 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.
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