Explicit Data Type Conversion in Visual Basic CType example

Data Types

An explicit conversion uses a type conversion keyword. Visual Basic provides several such keywords. These keywords work like functions, but the compiler generates the code inline, so execution is slightly faster than with a function call.

CType Function

The CType Function operates on two arguments. The first is the expression to be converted, and the second is the destination data type or object. Note that the first argument must be an expression, not a type. CType is an inline function, meaning the compiled code makes the conversion, often without generating a function call. This improves performance.

Code example

Dim objVal As Object
Dim oRange As Excel.Range

'Perform conversion
oRange = CType(objVal,Excel.Range)

List of inbuilt conversion functions

Conversion Keywords	Data type	Expression to be converted
CBool	Boolean	Any numeric type (including Byte, SByte, and enumerated types), String, Object
CByte	Byte	Any numeric type (including SByte and enumerated types), Boolean, String, Object
CChar	Char	String, Object
CDate	Date	String, Object
CDbl	Double	Any numeric type (including Byte, SByte, and enumerated types), Boolean, String, Object
CDec	Decimal	Any numeric type (including Byte, SByte, and enumerated types), Boolean, String, Object
CInt	Integer	Any numeric type (including Byte, SByte, and enumerated types), Boolean, String, Object
CLng	Long	Any numeric type (including Byte, SByte, and enumerated types), Boolean, String, Object
CObj	Object	Any type
CSByte	SByte	Any numeric type (including Byte and enumerated types), Boolean, String, Object
CShort	Short	Any numeric type (including Byte, SByte, and enumerated types), Boolean, String, Object
CSng	Single	Any numeric type (including Byte, SByte, and enumerated types), Boolean, String, Object
CStr	String	Any numeric type (including Byte, SByte, and enumerated types), Boolean, Char, Char array, Date, Object
Type	Type specified following by comman (,)	When converting to an elementary data type (including an array of an elementary type), the same types as allowed for the corresponding conversion keyword When converting to a composite data type, the interfaces it implements and the classes from which it inherits When converting to a class or structure on which you have overloaded CType, that class or structure
CUInt	UInteger	Any numeric type (including Byte, SByte, and enumerated types), Boolean, String, Object
CULng	ULong	Any numeric type (including Byte, SByte, and enumerated types), Boolean, String, Object
CUShort	UShort	Any numeric type (including Byte, SByte, and enumerated types), Boolean, String, Object

Note: Specifying CType to convert from one class type to another fails at run time if the source type does not derive from the destination type. Such a failure throws an InvalidCastException exception.

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Explicit Data Type Conversion in Visual Basic

Data Types

CType Function

Code example

List of inbuilt conversion functions

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