MethodImportAttributes Enum

Definition

Namespace:

System.Reflection

Assembly:

System.Reflection.Metadata.dll

Specifies flags for the unmanaged method import attributes.

This enumeration supports a bitwise combination of its member values.

public enum class MethodImportAttributes

[System.Flags]
public enum MethodImportAttributes

[<System.Flags>]
type MethodImportAttributes = 

Public Enum MethodImportAttributes

Inheritance

Object

ValueType

Enum

MethodImportAttributes

Attributes

FlagsAttribute

Fields

Name	Value	Description
None	0	Specifies default method import attributes.
ExactSpelling	1	Specifies that the Common Language Runtime should not try an entry-point names with charset-specific suffixes when searching for the imported method.
CharSetAnsi	2	Specifies that strings are marshalled as multiple-byte character strings: the system default Windows (ANSI) code page on Windows, and UTF-8 on Unix.
CharSetUnicode	4	Specifies that strings are marshalled as Unicode 2-byte character strings.
CharSetAuto	6	Specifies that the character set is chosen automatically. See Charsets and marshaling for details.
CharSetMask	6	Specifies the character set used for string marshalling.
BestFitMappingEnable	16	Specifies that the best-fit mapping behavior when converting Unicode characters to ANSI characters is enabled.
BestFitMappingDisable	32	Specifies that the best-fit mapping behavior when converting Unicode characters to ANSI characters is disabled.
BestFitMappingMask	48	Specifies whether the best-fit mapping behavior when converting Unicode characters to ANSI characters is enabled or disabled.
SetLastError	64	Specifies that the imported method calls the SetLastError Windows API function before returning.
CallingConventionWinApi	256	Specifies that the default platform calling convention is used.
CallingConventionCDecl	512	Specifies that the calling convention is CDecl.
CallingConventionStdCall	768	Specifies that the calling convention is StdCall.
CallingConventionThisCall	1024	Specifies that the calling convention is ThisCall.
CallingConventionFastCall	1280	Specifies that the calling convention is FastCall.
CallingConventionMask	1792	Specifies the calling convention.
ThrowOnUnmappableCharEnable	4096	Specifies that an exception should be thrown when an unmappable Unicode character is converted to an ANSI character.
ThrowOnUnmappableCharDisable	8192	Specifies that an exception should not be thrown when an unmappable Unicode character is converted to an ANSI character.
ThrowOnUnmappableCharMask	12288	Specifies whether an exception should be thrown when an unmappable Unicode character is converted to an ANSI character.

Remarks

Method import attributes are used with the MethodImport structure.

To check whether a value of this enumeration has the specific flag, combine that value with the corresponding mask constant using the bitwise AND operation (& in C#) and compare its result with the constant of the flag you need to check. For example, to check for CDecl calling convention, use a code like this:

if((attributes & MethodImportAttributes.CallingConventionMask) == MethodImportAttributes.CallingConventionCDecl)
{
    // The calling convention is CDecl
}

For more information about the unmanaged method import and the meaning of these attributes, see DllImportAttribute.