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MSDN Library

BStrWrapper Class

Note: This API is now obsolete.

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

System.Object
  System.Runtime.InteropServices.BStrWrapper

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

[ObsoleteAttribute("BStrWrapper and support for marshalling to the VARIANT type may be unavailable in future releases.")]
public sealed class BStrWrapper

The BStrWrapper type exposes the following members.

  NameDescription
Public methodSupported by Portable Class LibraryBStrWrapper(Object)Initializes a new instance of the BStrWrapper class with the specified Object object.
Public methodSupported by Portable Class LibraryBStrWrapper(String)Initializes a new instance of the BStrWrapper class with the specified String object.
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  NameDescription
Public propertySupported by Portable Class LibraryWrappedObjectGets the wrapped String object to marshal as type VT_BSTR.
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  NameDescription
Public methodSupported by Portable Class LibraryEquals(Object)Determines whether the specified object is equal to the current object. (Inherited from Object.)
Public methodSupported by Portable Class LibraryGetHashCodeServes as the default hash function. (Inherited from Object.)
Public methodSupported by Portable Class LibraryGetTypeGets the Type of the current instance. (Inherited from Object.)
Public methodSupported by Portable Class LibraryToStringReturns a string that represents the current object. (Inherited from Object.)
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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.

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0
Obsolete (compiler warning) in 4.6

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

.NET for Windows Phone apps

Obsolete (compiler warning) in Windows Phone 8.1

Portable Class Library

Supported in: Portable Class Library

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