Articolo
11/17/2011

SecurityCriticalAttribute Class

Microsoft Silverlight will reach end of support after October 2021. Learn more.

Specifies that code or an assembly performs security-critical operations.

Inheritance Hierarchy

System.Object
System.Attribute
System.Security.SecurityCriticalAttribute

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

Syntax

'Declaration
<AttributeUsageAttribute(AttributeTargets.Assembly Or AttributeTargets.Class Or AttributeTargets.Struct Or AttributeTargets.Enum Or AttributeTargets.Constructor Or AttributeTargets.Method Or AttributeTargets.Field Or AttributeTargets.Interface Or AttributeTargets.Delegate, AllowMultiple := False,  _
    Inherited := False)> _
Public NotInheritable Class SecurityCriticalAttribute _
    Inherits Attribute

[AttributeUsageAttribute(AttributeTargets.Assembly|AttributeTargets.Class|AttributeTargets.Struct|AttributeTargets.Enum|AttributeTargets.Constructor|AttributeTargets.Method|AttributeTargets.Field|AttributeTargets.Interface|AttributeTargets.Delegate, AllowMultiple = false, 
    Inherited = false)]
public sealed class SecurityCriticalAttribute : Attribute

The SecurityCriticalAttribute type exposes the following members.

Constructors

	Name	Description
	SecurityCriticalAttribute	Initializes a new instance of the SecurityCriticalAttribute class with default scope.

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Methods

	Name	Description
	Equals	Infrastructure. Returns a value that indicates whether this instance is equal to a specified object. (Inherited from Attribute.)
	Finalize	Allows an object to try to free resources and perform other cleanup operations before the Object is reclaimed by garbage collection. (Inherited from Object.)
	GetHashCode	Returns the hash code for this instance. (Inherited from Attribute.)
	GetType	Gets the Type of the current instance. (Inherited from Object.)
	Match	When overridden in a derived class, returns a value that indicates whether this instance equals a specified object. (Inherited from Attribute.)
	MemberwiseClone	Creates a shallow copy of the current Object. (Inherited from Object.)
	ToString	Returns a string that represents the current object. (Inherited from Object.)

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Remarks

Important Note:
Types and members that have the SecurityCriticalAttribute cannot be used by Silverlight application code. Security-critical types and members can be used only by trusted code in the .NET Framework for Silverlight class library.

Security-critical operations are actions that affect code access security, such as elevation of user rights, calling unsafe managed code, and so forth. The SecurityCriticalAttribute attribute must be applied to code for the code to perform security-critical operations. Operations that are not security-critical are described as either transparent or safe-critical. Transparent code cannot call security-critical code. However, transparent code can call types and members that are marked with the SecuritySafeCriticalAttribute attribute.

For assemblies that are installed with Silverlight, the presence of the SecurityCriticalAttribute at the assembly level identifies the entire assembly as security-critical. The SecurityCriticalAttribute is ignored when it is applied in user assemblies, that is, in assemblies that are not installed with the Silverlight library assemblies and that are not signed with a specific strong-name key.

Version Information

Silverlight

Supported in: 5, 4, 3

Silverlight for Windows Phone

Supported in: Windows Phone OS 7.1, Windows Phone OS 7.0

XNA Framework

Supported in: Xbox 360, Windows Phone OS 7.0

Platforms

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.

Thread Safety

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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