IsSecurityTransparent Property

TypeBuilder.IsSecurityTransparent Property

.NET Framework (current version)
 

Gets a value that indicates whether the current type is transparent, and therefore cannot perform critical operations.

Namespace:   System.Reflection.Emit
Assembly:  mscorlib (in mscorlib.dll)

public override bool IsSecurityTransparent { get; }

Property Value

Type: System.Boolean

true if the type is security-transparent; otherwise, false.

Exception Condition
NotSupportedException

The current dynamic type has not been created by calling the CreateType method.

The IsSecurityCritical, IsSecuritySafeCritical, and IsSecurityTransparent properties report the transparency level of the type, as determined by the common language runtime (CLR). The combinations of these properties are shown in the following table:

Security level

IsSecurityCritical

IsSecuritySafeCritical

IsSecurityTransparent

Critical

true

false

false

Safe-critical

true

true

false

Transparent

false

false

true

Using these properties is much simpler than examining the security annotations of an assembly and its types, checking the current trust level, and attempting to duplicate the runtime's rules.

The runtime begins evaluating transparency levels at the assembly. For example, if the dynamic assembly is security-critical, annotations on types are ignored, and all types are security-critical.

By default, a dynamic assembly inherits the transparency of the assembly that emits it. You can override this default by using the AppDomain.DefineDynamicAssembly(AssemblyName, AssemblyBuilderAccess, IEnumerable<CustomAttributeBuilder>), AppDomain.DefineDynamicAssembly(AssemblyName, AssemblyBuilderAccess, String, Boolean, IEnumerable<CustomAttributeBuilder>), or AppDomain.DefineDynamicAssembly(AssemblyName, AssemblyBuilderAccess, String, Evidence, PermissionSet, PermissionSet, PermissionSet, Boolean, IEnumerable<CustomAttributeBuilder>) method overload and specifying security attributes. You cannot elevate security levels by doing this; that is, transparent code cannot emit security-critical or security-safe-critical code. Attributes must be specified when the dynamic assembly is created, or they do not take effect until the assembly has been saved to disk and reloaded.

System_CAPS_noteNote

Default inheritance is limited to the runtime's evaluation of transparency. No attributes are applied to the dynamic assembly. If you want to add security attributes, you must apply them yourself.

For more information about reflection emit and transparency, see Security Issues in Reflection Emit. For information about transparency, see Security Changes in the .NET Framework.

.NET Framework
Available since 4.0
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