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| Class | Description |
|---|
   | AccessedThroughPropertyAttribute | Specifies the name of the property that accesses the attributed field. |
  | AsyncStateMachineAttribute | Indicates whether a method is marked with either the Async (Visual Basic) or async (C# Reference) modifier. |
 | CallConvCdecl | Indicates that a method should use the Cdecl calling convention. |
 | CallConvFastcall | This calling convention is not supported in this version of the .NET Framework. |
 | CallConvStdcall | Indicates that a method should use the StdCall calling convention. |
 | CallConvThiscall | Indicates that a method should use the ThisCall calling convention. |
  | CallerFilePathAttribute | Allows you to obtain the full path of the source file that contains the caller. This is the file path at the time of compile. |
  | CallerLineNumberAttribute | Allows you to obtain the line number in the source file at which the method is called. |
  | CallerMemberNameAttribute | Allows you to obtain the method or property name of the caller to the method. |
   | CallSite | A dynamic call site base class. This type is used as a parameter type to the dynamic site targets. |
   | CallSite<T> | Dynamic site type. |
   | CallSiteBinder | Class responsible for runtime binding of the dynamic operations on the dynamic call site. |
   | CallSiteHelpers | Class that contains helper methods for DLR CallSites. |
 | CallSiteOps | Infrastructure. Creates and caches binding rules. |
 | Closure | Infrastructure. Represents the runtime state of a dynamically generated method. |
   | CompilationRelaxationsAttribute | Controls the strictness of the code generated by the common language runtime's just-in-time (JIT) compiler. |
   | CompilerGeneratedAttribute | Distinguishes a compiler-generated element from a user-generated element. This class cannot be inherited. |
 | CompilerGlobalScopeAttribute | Indicates that a class should be treated as if it has global scope. |
 | CompilerMarshalOverride | Indicates that the modified instance of a variable differs from its true type when marshaling. This class cannot be inherited. |
   | ConditionalWeakTable<TKey, TValue> | Enables compilers to dynamically attach object fields to managed objects. |
  | ContractHelper | Provides methods that the binary rewriter uses to handle contract failures. |
   | CustomConstantAttribute | Defines a constant value that a compiler can persist for a field or method parameter. |
   | DateTimeConstantAttribute | Persists an 8-byte DateTime constant for a field or parameter. |
 | DebugInfoGenerator | Generates debug information for lambda expressions in an expression tree. |
   | DecimalConstantAttribute | Stores the value of a System.Decimal constant in metadata. This class cannot be inherited. |
 | DefaultDependencyAttribute | Provides a hint to the common language runtime (CLR) indicating how likely a dependency is to be loaded. This class is used in a dependent assembly to indicate what hint should be used when the parent does not specify the DependencyAttribute attribute. This class cannot be inherited. |
 | DependencyAttribute | Indicates when a dependency is to be loaded by the referring assembly. This class cannot be inherited. |
 | DiscardableAttribute | Marks a type definition as discardable. |
   | DynamicAttribute | Indicates that the use of Object on a member is meant to be treated as a dynamically dispatched type. |
 | ExecutionScope | Infrastructure. Obsolete. Represents the runtime state of a dynamically generated method. |
   | ExtensionAttribute | Indicates that a method is an extension method, or that a class or assembly contains extension methods. |
 | FixedAddressValueTypeAttribute | Fixes the address of a static value type field throughout its lifetime. This class cannot be inherited. |
   | FixedBufferAttribute | Indicates that a field should be treated as containing a fixed number of elements of the specified primitive type. This class cannot be inherited. |
 | HasCopySemanticsAttribute | This class is not used in the .NET Framework version 2.0 and is reserved for future use. This class cannot be inherited. |
 | IDispatchConstantAttribute | Indicates that the default value for the attributed field or parameter is an instance of DispatchWrapper, where the WrappedObject is null. |
   | IndexerNameAttribute | Indicates the name by which an indexer is known in programming languages that do not support indexers directly. |
   | InternalsVisibleToAttribute | Specifies that types that are ordinarily visible only within the current assembly are visible to a specified assembly. |
 | IsBoxed | Indicates that the modified reference type is a boxed value type. This class cannot be inherited. |
 | IsByValue | Indicates that a modified method argument should be interpreted as having object passed-by-value semantics. This modifier is applied to reference types. This class cannot be inherited. |
 | IsConst | Indicates that the modified type has a const modifier. This class cannot be inherited. |
 | IsCopyConstructed | Indicates that any copying of values of this type must use the copy constructor provided by the type. This class cannot be inherited. |
 | IsExplicitlyDereferenced | Indicates that a managed pointer represents a pointer parameter within a method signature. This class cannot be inherited. |
 | IsImplicitlyDereferenced | Indicates that the modified garbage collection reference represents a reference parameter within a method signature. This class cannot be inherited. |
 | IsJitIntrinsic | Indicates that a modified method is an intrinsic value for which the just-in-time (JIT) compiler can perform special code generation. This class cannot be inherited. |
 | IsLong | Indicates that a modified integer is a standard C++ long value. This class cannot be inherited. |
 | IsPinned | Indicates that a modified instance is pinned in memory. This class cannot be inherited. |
 | IsSignUnspecifiedByte | Indicates that a modifier is neither signed nor unsigned. This class cannot be inherited. |
 | IsUdtReturn | Indicates that a return type is a user-defined type. This class cannot be inherited. |
   | IsVolatile | Marks a field as volatile. This class cannot be inherited. |
  | IteratorStateMachineAttribute | Indicates whether a method in Visual Basic is marked with the Iterator modifier. |
 | IUnknownConstantAttribute | Indicates that the default value for the attributed field or parameter is an instance of UnknownWrapper, where the WrappedObject is null. This class cannot be inherited. |
   | MethodImplAttribute | Specifies the details of how a method is implemented. This class cannot be inherited. |
 | NativeCppClassAttribute | Applies metadata to an assembly that indicates that a type is an unmanaged type. This class cannot be inherited. |
 | ReadOnlyCollectionBuilder<T> | The builder for read only collection. |
  | ReferenceAssemblyAttribute | Identifies an assembly as a reference assembly, which contains metadata but no executable code. |
 | RequiredAttributeAttribute | Specifies that an importing compiler must fully understand the semantics of a type definition, or refuse to use it. This class cannot be inherited. |
 | RuleCache<T> | Infrastructure. Represents a cache of runtime binding rules. |
   | RuntimeCompatibilityAttribute | Specifies whether to wrap exceptions that do not derive from the Exception class with a RuntimeWrappedException object. This class cannot be inherited. |
   | RuntimeHelpers | Provides a set of static methods and properties that provide support for compilers. This class cannot be inherited. |
 | RuntimeOps | Infrastructure. Contains helper methods called from dynamically generated methods. |
 | RuntimeWrappedException | Wraps an exception that does not derive from the Exception class. This class cannot be inherited. |
 | ScopelessEnumAttribute | Indicates that a native enumeration is not qualified by the enumeration type name. This class cannot be inherited. |
 | SpecialNameAttribute | Indicates that a type or member is treated in a special way by the runtime or tools. This class cannot be inherited. |
  | StateMachineAttribute | Allows you to determine whether a method is a state machine method. |
 | StringFreezingAttribute | Deprecated. Freezes a string literal when creating native images using the Ngen.exe (Native Image Generator). This class cannot be inherited. |
   | StrongBox<T> | Holds a reference to a value. |
 | SuppressIldasmAttribute | Prevents the Ildasm.exe (MSIL Disassembler) from disassembling an assembly. This class cannot be inherited. |
   | TypeForwardedFromAttribute | Specifies a source Type in another assembly. |
   | TypeForwardedToAttribute | Specifies a destination Type in another assembly. |
   | UnsafeValueTypeAttribute | Specifies that a type contains an unmanaged array that might potentially overflow. This class cannot be inherited. |