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FileIOPermissionAttribute Class

Allows security actions for FileIOPermission to be applied to code using declarative security. This class cannot be inherited.

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

[SerializableAttribute]
[ComVisibleAttribute(true)]
[AttributeUsageAttribute(AttributeTargets.Assembly|AttributeTargets.Class|AttributeTargets.Struct|AttributeTargets.Constructor|AttributeTargets.Method, AllowMultiple = true, 
	Inherited = false)]
public sealed class FileIOPermissionAttribute : CodeAccessSecurityAttribute

The FileIOPermissionAttribute type exposes the following members.

  NameDescription
Public methodFileIOPermissionAttributeInitializes a new instance of the FileIOPermissionAttribute class with the specified SecurityAction.
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  NameDescription
Public propertyActionGets or sets a security action. (Inherited from SecurityAttribute.)
Public propertyAll Obsolete. Gets or sets full access for the file or directory that is specified by the string value.
Public propertyAllFilesGets or sets the permitted access to all files.
Public propertyAllLocalFilesGets or sets the permitted access to all local files.
Public propertyAppendGets or sets append access for the file or directory that is specified by the string value.
Public propertyChangeAccessControlGets or sets the file or directory in which access control information can be changed.
Public propertyPathDiscoveryGets or sets the file or directory to which to grant path discovery.
Public propertyReadGets or sets read access for the file or directory specified by the string value.
Public propertyTypeIdWhen implemented in a derived class, gets a unique identifier for this Attribute. (Inherited from Attribute.)
Public propertyUnrestrictedGets or sets a value indicating whether full (unrestricted) permission to the resource protected by the attribute is declared. (Inherited from SecurityAttribute.)
Public propertyViewAccessControlGets or sets the file or directory in which access control information can be viewed.
Public propertyViewAndModifyGets or sets the file or directory in which file data can be viewed and modified.
Public propertyWriteGets or sets write access for the file or directory specified by the string value.
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  NameDescription
Public methodCreatePermissionCreates and returns a new FileIOPermission. (Overrides SecurityAttribute.CreatePermission().)
Public methodEqualsInfrastructure. Returns a value that indicates whether this instance is equal to a specified object. (Inherited from Attribute.)
Protected methodFinalizeAllows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.)
Public methodGetHashCodeReturns the hash code for this instance. (Inherited from Attribute.)
Public methodGetTypeGets the Type of the current instance. (Inherited from Object.)
Public methodIsDefaultAttributeWhen overridden in a derived class, indicates whether the value of this instance is the default value for the derived class. (Inherited from Attribute.)
Public methodMatchWhen overridden in a derived class, returns a value that indicates whether this instance equals a specified object. (Inherited from Attribute.)
Protected methodMemberwiseCloneCreates a shallow copy of the current Object. (Inherited from Object.)
Public methodToStringReturns a string that represents the current object. (Inherited from Object.)
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  NameDescription
Explicit interface implemetationPrivate method_Attribute.GetIDsOfNamesMaps a set of names to a corresponding set of dispatch identifiers. (Inherited from Attribute.)
Explicit interface implemetationPrivate method_Attribute.GetTypeInfoRetrieves the type information for an object, which can be used to get the type information for an interface. (Inherited from Attribute.)
Explicit interface implemetationPrivate method_Attribute.GetTypeInfoCountRetrieves the number of type information interfaces that an object provides (either 0 or 1). (Inherited from Attribute.)
Explicit interface implemetationPrivate method_Attribute.InvokeProvides access to properties and methods exposed by an object. (Inherited from Attribute.)
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Files and directories are specified using absolute paths. When accessing files, a security check is performed when the file is created or opened. The security check is not done again unless the file is closed and reopened. Checking permissions when the file is first accessed minimizes the impact of the security check on application performance because opening a file happens only once, while reading and writing can happen multiple times.

The scope of the declaration that is allowed depends on the SecurityAction that is used.

The security information declared by a security attribute is stored in the metadata of the attribute target and is accessed by the system at run time. Security attributes are used only for declarative security. For imperative security, use the corresponding permission class.

Caution noteCaution

Unrestricted FileIOPermission grants permission for all paths within a file system, including multiple pathnames that can be used to access a single given file. To Deny access to a file, you must Deny all possible paths to the file. For example, if \\server\share is mapped to the network drive X, to Deny access to \\server\share\file, you must Deny \\server\share\file, X:\file and any other path that you can use to access the file.

The following code example demonstrates how to request FileIOPermission by using the FileIOPermissionAttribute class, indicating the only permission that is to be granted to the code.


[FileIOPermissionAttribute(SecurityAction.PermitOnly, ViewAndModify = "C:\\example\\sample.txt")]


The following example shows how to demand that the calling code has unrestricted FileIOPermission. You typically make demands in managed libraries (DLLs) to help protect methods or classes from potentially harmful code.


[FileIOPermissionAttribute(SecurityAction.Demand, Unrestricted=true)]


.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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