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AllowPartiallyTrustedCallersAttribute Class

Allows an assembly to be called by partially trusted code. Without this declaration, only fully trusted callers are able to use the assembly. This class cannot be inherited.

System.Object
  System.Attribute
    System.Security.AllowPartiallyTrustedCallersAttribute

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

[<Sealed>]
[<ComVisibleAttribute(true)>]
[<AttributeUsageAttribute(AttributeTargets.Assembly, AllowMultiple = false, 
    Inherited = false)>]
type AllowPartiallyTrustedCallersAttribute =  
    class 
        inherit Attribute 
    end

The AllowPartiallyTrustedCallersAttribute type exposes the following members.

  NameDescription
Public methodSupported by Portable Class LibrarySupported in .NET for Windows Store appsAllowPartiallyTrustedCallersAttributeInitializes a new instance of the AllowPartiallyTrustedCallersAttribute class.
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  NameDescription
Public propertyPartialTrustVisibilityLevelGets or sets the default partial trust visibility for code that is marked with the AllowPartiallyTrustedCallersAttribute (APTCA) attribute.
Public propertyTypeIdWhen implemented in a derived class, gets a unique identifier for this Attribute. (Inherited from Attribute.)
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  NameDescription
Public methodSupported by Portable Class LibrarySupported in .NET for Windows Store appsEqualsInfrastructure. Returns a value that indicates whether this instance is equal to a specified object. (Inherited from Attribute.)
Public methodSupported by Portable Class LibrarySupported in .NET for Windows Store appsGetHashCodeReturns the hash code for this instance. (Inherited from Attribute.)
Public methodSupported by Portable Class LibrarySupported in .NET for Windows Store appsGetTypeGets 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.)
Public methodSupported by Portable Class LibrarySupported in .NET for Windows Store appsToStringReturns 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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NoteNote

The .NET Framework 4 introduces new security rules that affect the behavior of the AllowPartiallyTrustedCallersAttribute attribute (see Security-Transparent Code, Level 2). In the .NET Framework 4, all code defaults to security-transparent, that is, partially trusted. However, you can annotate individual types and members to assign them other transparency attributes. For this and other security changes, see Security Changes in the .NET Framework.

.NET Framework version 2.0 (level 1 transparent) assemblies must be strong-named to effectively use the AllowPartiallyTrustedCallersAttribute (APTCA) attribute. .NET Framework 4 (level 2) assemblies do not have to be strong-named for the APTCA attribute to be effective, and they can contain transparent, security-critical and security-safe-critical code. For more information about applying attributes at the assembly level, see Applying Attributes.

By default, if a strong-named, level 1 transparent assembly does not explicitly apply this attribute at the assembly level, it can be called only by other assemblies that are granted full trust. This restriction is enforced by placing a LinkDemand for FullTrust on every public or protected method on every publicly accessible class in the assembly. Assemblies that are intended to be called by partially trusted code can declare their intent through the use of AllowPartiallyTrustedCallersAttribute. An example of the declaration in C# is [assembly:AllowPartiallyTrustedCallers]; an example in Visual Basic is <assembly:AllowPartiallyTrustedCallers>.

Caution noteCaution

The presence of this assembly-level attribute prevents the default behavior of placing FullTrust LinkDemand security checks, and makes the assembly callable from any other (partially or fully trusted) assembly.

When the APTCA attribute is present, all other security checks function as intended, including any class-level or method-level declarative security attributes that are present. This attribute blocks only the implicit, fully trusted caller demand.

This is not a declarative security attribute, but a regular attribute (it derives from System.Attribute, not from System.Security.Permissions.SecurityAttribute).

For more information, see Using Libraries from Partially Trusted Code.

The following example shows how to use the AllowPartiallyTrustedCallersAttribute class.

No code example is currently available or this language may not be supported.

.NET Framework

Supported in: 4.5.2, 4.5.1, 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Portable Class Library

Supported in: Portable Class Library

.NET for Windows Store apps

Supported in: Windows 8

.NET for Windows Phone apps

Supported in: Windows Phone 8.1, Windows Phone 8, Silverlight 8.1

Windows Phone 8.1, Windows Phone 8, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

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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