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Marshal.GetStartComSlot Method

Gets the first slot in the virtual function table (v-table or VTBL) that contains user-defined methods.

Namespace:  System.Runtime.InteropServices
Assembly:  mscorlib (in mscorlib.dll)

public static int GetStartComSlot(
	Type t
)

Parameters

t
Type: System.Type

A type that represents an interface.

Return Value

Type: System.Int32
The first VTBL slot that contains user-defined methods. The first slot is 3 if the interface is based on IUnknown, and 7 if the interface is based on IDispatch.

ExceptionCondition
ArgumentException

t is not visible from COM.

This method returns the zero-based v-table number for an interface or a class. When used on a class, the slot number that is returned refers to the class interface for the class. If the class interface is auto-dispatch, this method always returns -1 to indicate that the dispatch-only interface does not expose a v-table to managed clients. You can use GetStartComSlot and Marshal.GetEndComSlot in conjunction with Marshal.GetMethodInfoForComSlot to pass slots within a specified range. For additional information, see Introducing the Class Interface.

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Portable Class Library

Supported in: Portable Class Library

Supported in: Windows Phone 8.1

  • SecurityCriticalAttribute 

    requires full trust for the immediate caller. This member cannot be used by partially trusted or transparent code.

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