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BStrWrapper Class

.NET Framework 4.5

Other Versions

Marshals data of type VT_BSTR from managed to unmanaged code. This class cannot be inherited.

Inheritance Hierarchy

System.Object
System.Runtime.InteropServices.BStrWrapper

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

Syntax

C++

[SerializableAttribute]
[ComVisibleAttribute(true)]
public sealed class BStrWrapper

The BStrWrapper type exposes the following members.

Constructors

	Name	Description
	BStrWrapper(Object)	Initializes a new instance of the BStrWrapper class with the specified Object object.
	BStrWrapper(String)	Initializes a new instance of the BStrWrapper class with the specified String object.

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Properties

	Name	Description
	WrappedObject	Gets the wrapped String object to marshal as type VT_BSTR.

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Methods

	Name	Description
	Equals(Object)	Determines whether the specified object is equal to the current object. (Inherited from Object.)
	GetHashCode	Serves as a hash function for a particular type. (Inherited from Object.)
	GetType	Gets the Type of the current instance. (Inherited from Object.)
	ToString	Returns a string that represents the current object. (Inherited from Object.)

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Remarks

The BStrWrapper class controls how the wrapped object is marshaled when passed as VARIANT. You can wrap a String object in a BStrWrapper object to marshal it as VT_BSTR. BStrWrapper is useful when passing a null string to unmanaged code. Without BStrWrapper, a null string is passed as VT_EMPTY; however, wrapping the string with BStrWrapper ensures that the null string is passed as VT_BSTR.

Version Information

.NET Framework

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

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Portable Class Library

Supported in: Portable Class Library

.NET for Windows Store apps

Supported in: Windows 8

Platforms

Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

Thread Safety

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Reference

System.Runtime.InteropServices Namespace

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