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.NET Framework 4.5
.NET Framework Class Library
System.Runtime Namespaces
System.Runtime.CompilerServices
AccessedThroughPropertyAttribute Class
AsyncStateMachineAttribute Class
AsyncTaskMethodBuilder Structure
AsyncTaskMethodBuilder(TResult) Structure
AsyncVoidMethodBuilder Structure
CallConvCdecl Class
CallConvFastcall Class
CallConvStdcall Class
CallConvThiscall Class
CallerFilePathAttribute Class
CallerLineNumberAttribute Class
CallerMemberNameAttribute Class
CallSite Class
CallSite(T) Class
CallSiteBinder Class
CallSiteHelpers Class
CallSiteOps Class
Closure Class
CompilationRelaxations Enumeration
CompilationRelaxationsAttribute Class
CompilerGeneratedAttribute Class
CompilerGlobalScopeAttribute Class
CompilerMarshalOverride Class
ConditionalWeakTable(TKey, TValue) Class
ConditionalWeakTable(TKey, TValue).CreateValueCallback Delegate
ConfiguredTaskAwaitable Structure
ConfiguredTaskAwaitable.ConfiguredTaskAwaiter Structure
ConfiguredTaskAwaitable(TResult) Structure
ConfiguredTaskAwaitable(TResult).ConfiguredTaskAwaiter Structure
ContractHelper Class
CustomConstantAttribute Class
DateTimeConstantAttribute Class
DebugInfoGenerator Class
DecimalConstantAttribute Class
DefaultDependencyAttribute Class
DependencyAttribute Class
DiscardableAttribute Class
DynamicAttribute Class
ExecutionScope Class
ExtensionAttribute Class
FixedAddressValueTypeAttribute Class
FixedBufferAttribute Class
HasCopySemanticsAttribute Class
IAsyncStateMachine Interface
ICriticalNotifyCompletion Interface
IDispatchConstantAttribute Class
IndexerNameAttribute Class
INotifyCompletion Interface
InternalsVisibleToAttribute Class
IRuntimeVariables Interface
IsBoxed Class
IsByValue Class
IsConst Class
IsCopyConstructed Class
IsExplicitlyDereferenced Class
IsImplicitlyDereferenced Class
IsJitIntrinsic Class
IsLong Class
IsPinned Class
IsSignUnspecifiedByte Class
IStrongBox Interface
IsUdtReturn Class
IsVolatile Class
IteratorStateMachineAttribute Class
IUnknownConstantAttribute Class
LoadHint Enumeration
MethodCodeType Enumeration
MethodImplAttribute Class
MethodImplOptions Enumeration
NativeCppClassAttribute Class
ReadOnlyCollectionBuilder(T) Class
ReferenceAssemblyAttribute Class
RequiredAttributeAttribute Class
RuleCache(T) Class
RuntimeCompatibilityAttribute Class
RuntimeHelpers Class
RuntimeHelpers.CleanupCode Delegate
RuntimeHelpers.TryCode Delegate
RuntimeOps Class
RuntimeWrappedException Class
ScopelessEnumAttribute Class
SpecialNameAttribute Class
StateMachineAttribute Class
StringFreezingAttribute Class
StrongBox(T) Class
SuppressIldasmAttribute Class
TaskAwaiter Structure
TaskAwaiter(TResult) Structure
TypeForwardedFromAttribute Class
TypeForwardedToAttribute Class
UnsafeValueTypeAttribute Class
YieldAwaitable Structure
YieldAwaitable.YieldAwaiter Structure
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System.Runtime.CompilerServices Namespace

.NET Framework 4.5

The System.Runtime.CompilerServices namespace provides functionality for compiler writers who use managed code to specify attributes in metadata that affect the run-time behavior of the common language runtime.

This namespace is primarily for compiler writers, although several of its classes, such as InternalsVisibleToAttribute, are used in a wide variety of applications.

  Class Description
Public class Supported by Portable Class Library Supported in .NET for Windows Store apps AccessedThroughPropertyAttribute Specifies the name of the property that accesses the attributed field.
Public class Supported in .NET for Windows Store apps AsyncStateMachineAttribute Indicates whether a method is marked with either the Async (Visual Basic) or async (C# Reference) modifier.
Public class CallConvCdecl Indicates that a method should use the Cdecl calling convention.
Public class CallConvFastcall This calling convention is not supported in this version of the .NET Framework.
Public class CallConvStdcall Indicates that a method should use the StdCall calling convention.
Public class CallConvThiscall Indicates that a method should use the ThisCall calling convention.
Public class Supported in .NET for Windows Store apps 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.
Public class Supported in .NET for Windows Store apps CallerLineNumberAttribute Allows you to obtain the line number in the source file at which the method is called.
Public class Supported in .NET for Windows Store apps CallerMemberNameAttribute Allows you to obtain the method or property name of the caller to the method.
Public class Supported by Portable Class Library Supported in .NET for Windows Store apps CallSite A dynamic call site base class. This type is used as a parameter type to the dynamic site targets.
Public class Supported by Portable Class Library Supported in .NET for Windows Store apps CallSite<T> Dynamic site type.
Public class Supported by Portable Class Library Supported in .NET for Windows Store apps CallSiteBinder Class responsible for runtime binding of the dynamic operations on the dynamic call site.
Public class Supported by Portable Class Library Supported in .NET for Windows Store apps CallSiteHelpers Class that contains helper methods for DLR CallSites.
Public class CallSiteOps Infrastructure. Creates and caches binding rules.
Public class Closure Infrastructure. Represents the runtime state of a dynamically generated method.
Public class Supported by Portable Class Library Supported in .NET for Windows Store apps CompilationRelaxationsAttribute Controls the strictness of the code generated by the common language runtime's just-in-time (JIT) compiler.
Public class Supported by Portable Class Library Supported in .NET for Windows Store apps CompilerGeneratedAttribute Distinguishes a compiler-generated element from a user-generated element. This class cannot be inherited.
Public class CompilerGlobalScopeAttribute Indicates that a class should be treated as if it has global scope.
Public class CompilerMarshalOverride Indicates that the modified instance of a variable differs from its true type when marshaling. This class cannot be inherited.
Public class Supported by Portable Class Library Supported in .NET for Windows Store apps ConditionalWeakTable<TKey, TValue> Enables compilers to dynamically attach object fields to managed objects.
Public class Supported in .NET for Windows Store apps ContractHelper Provides methods that the binary rewriter uses to handle contract failures.
Public class Supported by Portable Class Library Supported in .NET for Windows Store apps CustomConstantAttribute Defines a constant value that a compiler can persist for a field or method parameter.
Public class Supported by Portable Class Library Supported in .NET for Windows Store apps DateTimeConstantAttribute Persists an 8-byte DateTime constant for a field or parameter.
Public class DebugInfoGenerator Generates debug information for lambda expressions in an expression tree.
Public class Supported by Portable Class Library Supported in .NET for Windows Store apps DecimalConstantAttribute Stores the value of a System.Decimal constant in metadata. This class cannot be inherited.
Public class 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.
Public class DependencyAttribute Indicates when a dependency is to be loaded by the referring assembly. This class cannot be inherited.
Public class DiscardableAttribute Marks a type definition as discardable.
Public class Supported by Portable Class Library Supported in .NET for Windows Store apps DynamicAttribute Indicates that the use of Object on a member is meant to be treated as a dynamically dispatched type.
Public class ExecutionScope Infrastructure. Obsolete. Represents the runtime state of a dynamically generated method.
Public class Supported by Portable Class Library Supported in .NET for Windows Store apps ExtensionAttribute Indicates that a method is an extension method, or that a class or assembly contains extension methods.
Public class FixedAddressValueTypeAttribute Fixes the address of a static value type field throughout its lifetime. This class cannot be inherited.
Public class Supported by Portable Class Library Supported in .NET for Windows Store apps 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.
Public class HasCopySemanticsAttribute This class is not used in the .NET Framework version 2.0 and is reserved for future use. This class cannot be inherited.
Public class IDispatchConstantAttribute Indicates that the default value for the attributed field or parameter is an instance of DispatchWrapper, where the WrappedObject is null.
Public class Supported by Portable Class Library Supported in .NET for Windows Store apps IndexerNameAttribute Indicates the name by which an indexer is known in programming languages that do not support indexers directly.
Public class Supported by Portable Class Library Supported in .NET for Windows Store apps InternalsVisibleToAttribute Specifies that types that are ordinarily visible only within the current assembly are visible to a specified assembly.
Public class IsBoxed Indicates that the modified reference type is a boxed value type. This class cannot be inherited.
Public class 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.
Public class IsConst Indicates that the modified type has a const modifier. This class cannot be inherited.
Public class IsCopyConstructed Indicates that any copying of values of this type must use the copy constructor provided by the type. This class cannot be inherited.
Public class IsExplicitlyDereferenced Indicates that a managed pointer represents a pointer parameter within a method signature. This class cannot be inherited.
Public class IsImplicitlyDereferenced Indicates that the modified garbage collection reference represents a reference parameter within a method signature. This class cannot be inherited.
Public class 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.
Public class IsLong Indicates that a modified integer is a standard C++ long value. This class cannot be inherited.
Public class IsPinned Indicates that a modified instance is pinned in memory. This class cannot be inherited.
Public class IsSignUnspecifiedByte Indicates that a modifier is neither signed nor unsigned. This class cannot be inherited.
Public class IsUdtReturn Indicates that a return type is a user-defined type. This class cannot be inherited.
Public class Supported by Portable Class Library Supported in .NET for Windows Store apps IsVolatile Marks a field as volatile. This class cannot be inherited.
Public class Supported in .NET for Windows Store apps IteratorStateMachineAttribute Indicates whether a method in Visual Basic is marked with the Iterator modifier.
Public class 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.
Public class Supported by Portable Class Library Supported in .NET for Windows Store apps MethodImplAttribute Specifies the details of how a method is implemented. This class cannot be inherited.
Public class NativeCppClassAttribute Applies metadata to an assembly that indicates that a type is an unmanaged type. This class cannot be inherited.
Public class ReadOnlyCollectionBuilder<T> The builder for read only collection.
Public class Supported in .NET for Windows Store apps ReferenceAssemblyAttribute Identifies an assembly as a reference assembly, which contains metadata but no executable code.
Public class 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.
Public class RuleCache<T> Infrastructure. Represents a cache of runtime binding rules.
Public class Supported by Portable Class Library Supported in .NET for Windows Store apps RuntimeCompatibilityAttribute Specifies whether to wrap exceptions that do not derive from the Exception class with a RuntimeWrappedException object. This class cannot be inherited.
Public class Supported by Portable Class Library Supported in .NET for Windows Store apps RuntimeHelpers Provides a set of static methods and properties that provide support for compilers. This class cannot be inherited.
Public class RuntimeOps Infrastructure. Contains helper methods called from dynamically generated methods.
Public class RuntimeWrappedException Wraps an exception that does not derive from the Exception class. This class cannot be inherited.
Public class ScopelessEnumAttribute Indicates that a native enumeration is not qualified by the enumeration type name. This class cannot be inherited.
Public class SpecialNameAttribute Indicates that a type or member is treated in a special way by the runtime or tools. This class cannot be inherited.
Public class Supported in .NET for Windows Store apps StateMachineAttribute Allows you to determine whether a method is a state machine method.
Public class StringFreezingAttribute Deprecated. Freezes a string literal when creating native images using the Ngen.exe (Native Image Generator). This class cannot be inherited.
Public class Supported by Portable Class Library Supported in .NET for Windows Store apps StrongBox<T> Holds a reference to a value.
Public class SuppressIldasmAttribute Prevents the Ildasm.exe (MSIL Disassembler) from disassembling an assembly. This class cannot be inherited.
Public class Supported by Portable Class Library Supported in .NET for Windows Store apps TypeForwardedFromAttribute Specifies a source Type in another assembly.
Public class Supported by Portable Class Library Supported in .NET for Windows Store apps TypeForwardedToAttribute Specifies a destination Type in another assembly.
Public class Supported by Portable Class Library Supported in .NET for Windows Store apps UnsafeValueTypeAttribute Specifies that a type contains an unmanaged array that might potentially overflow. This class cannot be inherited.
  Structure Description
Public structure Supported in .NET for Windows Store apps AsyncTaskMethodBuilder Represents a builder for asynchronous methods that return a task.
Public structure Supported in .NET for Windows Store apps AsyncTaskMethodBuilder<TResult> Represents a builder for asynchronous methods that returns a task and provides a parameter for the result.
Public structure Supported in .NET for Windows Store apps AsyncVoidMethodBuilder Represents a builder for asynchronous methods that do not return a value.
Public structure Supported in .NET for Windows Store apps ConfiguredTaskAwaitable Provides an awaitable object that enables configured awaits on a task.
Public structure Supported in .NET for Windows Store apps ConfiguredTaskAwaitable.ConfiguredTaskAwaiter Provides an awaiter for an awaitable (ConfiguredTaskAwaitable) object.
Public structure Supported in .NET for Windows Store apps ConfiguredTaskAwaitable<TResult> Provides an awaitable object that enables configured awaits on a task.
Public structure Supported in .NET for Windows Store apps ConfiguredTaskAwaitable<TResult>.ConfiguredTaskAwaiter Provides an awaiter for an awaitable object(ConfiguredTaskAwaitable<TResult>).
Public structure Supported in .NET for Windows Store apps TaskAwaiter Provides an object that waits for the completion of an asynchronous task.
Public structure Supported in .NET for Windows Store apps TaskAwaiter<TResult> Represents an object that waits for the completion of an asynchronous task and provides a parameter for the result.
Public structure Supported in .NET for Windows Store apps YieldAwaitable Provides the context for waiting when asynchronously switching into a target environment.
Public structure Supported in .NET for Windows Store apps YieldAwaitable.YieldAwaiter Provides an awaiter for switching into a target environment.
  Interface Description
Public interface Supported in .NET for Windows Store apps IAsyncStateMachine Represents state machines that are generated for asynchronous methods. This type is intended for compiler use only.
Public interface Supported in .NET for Windows Store apps ICriticalNotifyCompletion Represents an awaiter that schedules continuations when an await operation completes.
Public interface Supported in .NET for Windows Store apps INotifyCompletion Represents an operation that schedules continuations when it completes.
Public interface IRuntimeVariables Represents the values of run-time variables.
Public interface Supported by Portable Class Library Supported in .NET for Windows Store apps IStrongBox Defines a property for accessing the value that an object references.
  Delegate Description
Public delegate Supported by Portable Class Library Supported in .NET for Windows Store apps ConditionalWeakTable<TKey, TValue>.CreateValueCallback Represents a method that creates a non-default value to add as part of a key/value pair to a ConditionalWeakTable<TKey, TValue> object.
Public delegate RuntimeHelpers.CleanupCode Represents a method to run when an exception occurs.
Public delegate RuntimeHelpers.TryCode Represents a delegate to code that should be run in a try block..
  Enumeration Description
Public enumeration CompilationRelaxations Specifies parameters that control the strictness of the code generated by the common language runtime's just-in-time (JIT) compiler.
Public enumeration LoadHint Specifies the preferred default binding for a dependent assembly.
Public enumeration MethodCodeType Defines how a method is implemented.
Public enumeration Supported by Portable Class Library Supported in .NET for Windows Store apps MethodImplOptions Defines the details of how a method is implemented.
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