Marshal.GetStartComSlot(Type) Method

Reference

Definition

Namespace:: System.Runtime.InteropServices

Assembly:: System.Runtime.InteropServices.dll

Assembly:: mscorlib.dll

Assembly:: netstandard.dll

Source:: Marshal.NoCom.cs

Source:: Marshal.NoCom.cs

Source:: Marshal.NoCom.cs

Important

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

public:
 static int GetStartComSlot(Type ^ t);

[System.Security.SecurityCritical]
public static int GetStartComSlot (Type t);

[System.Runtime.Versioning.SupportedOSPlatform("windows")]
public static int GetStartComSlot (Type t);

public static int GetStartComSlot (Type t);

[<System.Security.SecurityCritical>]
static member GetStartComSlot : Type -> int

[<System.Runtime.Versioning.SupportedOSPlatform("windows")>]
static member GetStartComSlot : Type -> int

static member GetStartComSlot : Type -> int

Public Shared Function GetStartComSlot (t As Type) As Integer

Parameters

t: Type

A type that represents an interface or a class.

Returns

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.

Attributes: SecurityCriticalAttribute SupportedOSPlatformAttribute

Exceptions

ArgumentException

t is not visible from COM.

Remarks

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.

Applies to