This documentation is archived and is not being maintained.

8.6 Value Type Conversions

Visual Studio .NET 2003

Although interfaces are reference types, value types may be converted to and from them. When converting a value type to an interface, the value type is copied to the .NET Framework heap and a reference is returned. This reference is then converted to the interface type.

When converting an interface type to a value type, the value must be a null reference or an instance of the value type. Otherwise a System.InvalidCastException exception is thrown. The conversion copies the value on the .NET Framework heap to the stack and converts it to the value type. A null reference is treated as if it were the literal Nothing.

See Also

8.5 Array Covariance | 8.8 Widening Conversions | 8.9 Narrowing Conversions | 8. Conversions | Conversion Summary (Visual Basic Language Reference) | Array Conversions (Visual Basic Language Concepts)

Show: