Returns an
Object with the specified
Type and whose value is equivalent to the specified object.
Namespace: System
Assembly: mscorlib (in mscorlib.dll)
Visual Basic (Declaration)
Public Shared Function ChangeType ( _
value As Object, _
conversionType As Type _
) As Object
Dim value As Object
Dim conversionType As Type
Dim returnValue As Object
returnValue = Convert.ChangeType(value, conversionType)
public static Object ChangeType (
Object value,
Type conversionType
)
public:
static Object^ ChangeType (
Object^ value,
Type^ conversionType
)
public static Object ChangeType (
Object value,
Type conversionType
)
public static function ChangeType (
value : Object,
conversionType : Type
) : Object
Parameters
- value
An Object that implements the IConvertible interface.
- conversionType
A Type.
Return Value
An object whose Type is conversionType and whose value is equivalent to value.
-or-
a null reference (Nothing in Visual Basic), if value is a null reference (Nothing in Visual Basic) and conversionType is not a value type.
| Exception type | Condition |
|---|
InvalidCastException | This conversion is not supported. -or- value is a null reference (Nothing in Visual Basic) and conversionType is a value type. |
ArgumentNullException | conversionType is a null reference (Nothing in Visual Basic). |
This method uses the current thread's culture for the conversion.
The following code sample illustrates the use of the ChangeType method.
Imports System
Public Class ChangeTypeTest
Public Shared Sub Main()
Dim d As [Double] = - 2.345
Dim i As Integer = CInt(Convert.ChangeType(d, GetType(Integer)))
Console.WriteLine("The double value {0} when converted to an int becomes {1}", d, i)
Dim s As String = "12/12/98"
Dim dt As DateTime = CType(Convert.ChangeType(s, GetType(DateTime)), DateTime)
Console.WriteLine("The string value {0} when converted to a Date becomes {1}", s, dt)
End Sub 'Main
End Class 'ChangeTypeTest
using System;
public class ChangeTypeTest {
public static void Main() {
Double d = -2.345;
int i = (int)Convert.ChangeType(d, typeof(int));
Console.WriteLine("The double value {0} when converted to an int becomes {1}", d, i);
string s = "12/12/98";
DateTime dt = (DateTime)Convert.ChangeType(s, typeof(DateTime));
Console.WriteLine("The string value {0} when converted to a Date becomes {1}", s, dt);
}
}
using namespace System;
int main()
{
Double d = -2.345;
int i = *safe_cast<Int32^>(Convert::ChangeType( d, int::typeid ));
Console::WriteLine( "The double value {0} when converted to an int becomes {1}", d, i );
String^ s = "12/12/98";
DateTime dt = *safe_cast<DateTime^>(Convert::ChangeType( s, DateTime::typeid ));
Console::WriteLine( "The string value {0} when converted to a Date becomes {1}", s, dt );
}
import System.*;
public class ChangeTypeTest
{
public static void main(String[] args)
{
Double d = new Double(-2.345);
int i = Convert.ToInt32((Convert.ChangeType(d, int.class.ToType())));
Console.WriteLine("The double value {0} when converted to an "
+ "int becomes {1}", System.Convert.ToString(d),
System.Convert.ToString(i));
String s = "12/12/98";
DateTime dt = (DateTime)(Convert.ChangeType(s, DateTime.
class.ToType()));
Console.WriteLine("The string value {0} when converted to "
+ "a Date becomes {1}", s, dt);
} //main
} //ChangeTypeTest
import System;
public class ChangeTypeTest {
public static function Main() {
var d : Double = -2.345;
var i : Int32 = Int32(Convert.ChangeType(d, Int32));
Console.WriteLine("The double value {0} when converted to an int becomes {1}", d, i);
var s : String = "12/12/98";
var dt : DateTime = DateTime(Convert.ChangeType(s, DateTime));
Console.WriteLine("The string value {0} when converted to a Date becomes {1}", s, dt);
}
}
Windows 98, Windows 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.
.NET Framework
Supported in: 2.0, 1.1, 1.0