Binder::ChangeType Method (Object^, Type^, CultureInfo^)
Changes the type of the given Object to the given Type.
Assembly: mscorlib (in mscorlib.dll)
public: virtual Object^ ChangeType( Object^ value, Type^ type, CultureInfo^ culture ) abstract
Parameters
- value
-
Type:
System::Object^
The object to change into a new Type.
- type
-
Type:
System::Type^
The new Type that value will become.
- culture
-
Type:
System.Globalization::CultureInfo^
An instance of CultureInfo that is used to control the coercion of data types. If culture is null, the CultureInfo for the current thread is used.
Note For example, this parameter is necessary to convert a String that represents 1000 to a Double value, because 1000 is represented differently by different cultures.
Reflection models the accessibility rules of the common type system. For example, if the caller is in the same assembly, the caller does not need special permissions for internal members. Otherwise, the caller needs ReflectionPermission. This is consistent with lookup of members that are protected, private, and so on.
The general principle is that ChangeType should perform only widening coercions, which never lose data. An example of a widening coercion is coercing a value that is a 32-bit signed integer to a value that is a 64-bit signed integer. This is distinguished from a narrowing coercion, which may lose data. An example of a narrowing coercion is coercing a 64-bit signed integer to a 32-bit signed integer.
The following table lists the coercions performed by the default ChangeType.
Source type | Target type |
|---|---|
Any type | Its base type. |
Any type | The interface it implements. |
Char | UInt16, UInt32, Int32, UInt64, Int64, Single, Double |
Byte | Char, UInt16, Int16, UInt32, Int32, UInt64, Int64, Single, Double |
SByte | Int16, Int32, Int64, Single, Double |
UInt16 | UInt32, Int32, UInt64, Int64, Single, Double |
Int16 | Int32, Int64, Single, Double |
UInt32 | UInt64, Int64, Single, Double |
Int32 | Int64, Single, Double |
UInt64 | Single, Double |
Int64 | Single, Double |
Single | Double |
Non-reference | By-reference. |
Available since 1.1
Silverlight
Available since 2.0
Windows Phone Silverlight
Available since 7.0