System.Runtime.InteropServices Namespace

This API supports the .NET Framework infrastructure and is not intended to be used directly from your code.

[ This article is for Windows Phone 8 developers. If you’re developing for Windows 10, see the latest documentation. ]

The System.Runtime.InteropServices namespace provides types that support COM interop and platform invoke services.

Classes

	Class	Description
	AllowReversePInvokeCallsAttribute	Allows an unmanaged method to call a managed method.
	ClassInterfaceAttribute	Infrastructure. Indicates the type of class interface to be generated for a class exposed to COM, if an interface is generated at all.
	CoClassAttribute	Infrastructure. Specifies the class identifier of a coclass imported from a type library.
	ComDefaultInterfaceAttribute	Infrastructure. Specifies a default interface to expose to COM. This class cannot be inherited.
	COMException	Infrastructure. The exception that is thrown when an unrecognized HRESULT is returned from a COM method call.
	ComImportAttribute	Infrastructure. Indicates that the attributed type was previously defined in COM.
	ComVisibleAttribute	Infrastructure. Controls accessibility of an individual managed type or member, or of all types within an assembly, to COM.
	CriticalHandle	Infrastructure. Represents a wrapper class for handle resources.
	DefaultCharSetAttribute	Infrastructure. Specifies the value of the CharSet enumeration. This class cannot be inherited.
	DispIdAttribute	Infrastructure. Specifies the COM dispatch identifier (DISPID) of a method, field, or property.
	DllImportAttribute	Infrastructure. Indicates that the attributed method is exposed by an unmanaged dynamic-link library (DLL) as a static entry point.
	ExternalException	Infrastructure. The base exception type for all COM interop exceptions and structured exception handling (SEH) exceptions.
	FieldOffsetAttribute	Infrastructure. Indicates the physical position of fields within the managed and unmanaged representation of a class or structure.
	GuidAttribute	Infrastructure. Supplies an explicit System..::.Guid when an automatic GUID is undesirable.
	InAttribute	Infrastructure. Indicates that data should be marshaled from the caller to the callee, but not back to the caller.
	InterfaceTypeAttribute	Infrastructure. Indicates whether a managed interface is dual, dispatch-only, or IUnknown -only when exposed to COM.
	Marshal	Infrastructure. Provides a collection of methods for allocating unmanaged memory, copying unmanaged memory blocks, and converting managed to unmanaged types, as well as other miscellaneous methods used when interacting with unmanaged code.
	MarshalAsAttribute	Infrastructure. Indicates how to marshal the data between managed and unmanaged code.
	MarshalDirectiveException	Infrastructure. The exception that is thrown by the marshaler when it encounters a MarshalAsAttribute it does not support.
	OptionalAttribute	Infrastructure. Indicates that a parameter is optional.
	OutAttribute	Infrastructure. Indicates that data should be marshaled from callee back to caller.
	PreserveSigAttribute	Infrastructure. Indicates that the HRESULT or retval signature transformation that takes place during COM interop calls should be suppressed.
	SafeHandle	Infrastructure. Represents a wrapper class for operating system handles. This class must be inherited.
	SEHException	Infrastructure. Represents Structured Exception Handler (SEH) errors.
	StructLayoutAttribute	Infrastructure. The StructLayoutAttribute class allows the user to control the physical layout of the data fields of a class or structure.
	UnmanagedFunctionPointerAttribute	Infrastructure. Controls the marshaling behavior of a delegate signature passed as an unmanaged function pointer to or from unmanaged code. This class cannot be inherited.

Structures

	Structure	Description
	GCHandle	Infrastructure. Provides a means for accessing a managed object from unmanaged memory.

Interfaces

	Interface	Description
	ICustomQueryInterface	Enables developers to provide a custom, managed implementation of the IUnknown::QueryInterface(REFIID riid, void **ppvObject) method.

Enumerations

	Enumeration	Description
	CallingConvention	Infrastructure. Specifies the calling convention required to call methods implemented in unmanaged code.
	CharSet	Infrastructure. Dictates which character set marshaled strings should use.
	ClassInterfaceType	Infrastructure. Identifies the type of class interface that is generated for a class.
	ComInterfaceType	Infrastructure. Identifies how to expose an interface to COM.
	CustomQueryInterfaceMode	Indicates whether IUnknown::QueryInterface calls can use the ICustomQueryInterface interface.
	CustomQueryInterfaceResult	Provides return values for the GetInterface method.
	GCHandleType	Infrastructure. Represents the types of handles the GCHandle class can allocate.
	LayoutKind	Infrastructure. Controls the layout of an object when exported to unmanaged code.
	UnmanagedType	Infrastructure. Identifies how to marshal parameters or fields to unmanaged code.