CharSet CharSet CharSet CharSet Enum


Dictates which character set marshaled strings should use.

public enum class CharSet
public enum CharSet
type CharSet = 
Public Enum CharSet


Ansi Ansi Ansi Ansi 2

Marshal strings as multiple-byte character strings.

Auto Auto Auto Auto 4

Automatically marshal strings appropriately for the target operating system. See Charsets and marshaling for details. Although the common language runtime default is Auto, languages may override this default. For example, by default C# and Visual Basic mark all methods and types as Ansi.

None None None None 1

This value is obsolete and has the same behavior as Ansi.

Unicode Unicode Unicode Unicode 3

Marshal strings as Unicode 2-byte character strings.


The following code example shows how to specify a CharSet enumeration value when applying the StructLayoutAttribute to a managed definition.

[StructLayout(LayoutKind::Sequential, CharSet=CharSet::Ansi)]
public ref struct MyPerson
    String^ first;
    String^ last;
[StructLayout(LayoutKind.Sequential, CharSet=CharSet.Ansi)]
public struct MyPerson
    public String first;
    public String last;
<StructLayout(LayoutKind.Sequential, CharSet:=CharSet.Ansi)> _
Public Structure MyPerson
    Public first As String
    Public last As String
End Structure


Because there are several unmanaged string types and only one managed string type, you must use a character set to specify how managed strings should be marshaled to unmanaged code. This enumeration, which provides character set options, is used by DllImportAttribute and StructLayoutAttribute. For a detailed description of the string marshaling and name matching behavior associated with this enumeration, see Specifying a Character Set.

Applies to

See also