Gets a value that indicates whether the current type is security-safe-critical; that is, whether it can perform critical operations and can be accessed by transparent code.
Assembly: mscorlib (in mscorlib.dll)
The IsSecurityCritical, , 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:
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.
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.