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ParameterAttributes Enumeration

.NET Framework 4.5

Other Versions

Defines the attributes that can be associated with a parameter. These are defined in CorHdr.h.

This enumeration has a FlagsAttribute attribute that allows a bitwise combination of its member values.

Namespace: System.Reflection
Assembly: mscorlib (in mscorlib.dll)

Syntax

C++

[SerializableAttribute]
[FlagsAttribute]
[ComVisibleAttribute(true)]
public enum ParameterAttributes

Members

	Member name	Description
	None	Specifies that there is no parameter attribute.
	In	Specifies that the parameter is an input parameter.
	Out	Specifies that the parameter is an output parameter.
	Lcid	Specifies that the parameter is a locale identifier (lcid).
	Retval	Specifies that the parameter is a return value.
	Optional	Specifies that the parameter is optional.
	ReservedMask	Specifies that the parameter is reserved.
	HasDefault	Specifies that the parameter has a default value.
	HasFieldMarshal	Specifies that the parameter has field marshaling information.
	Reserved3	Reserved.
	Reserved4	Reserved.

Remarks

To get the ParameterAttributes value, first get the Type. From the Type, get the ParameterInfo array. The ParameterAttributes value is within the array.

These enumerator values are dependent on optional metadata. Not all attributes are available from all compilers. See the appropriate compiler instructions to determine which enumerated values are available.

Examples

The following example displays the attributes of the specified parameter.

C++

using System;
using System.Reflection;

class paramatt
{
    public static void mymethod (string str1, out string str2, ref string str3)
    {
        str2 = "string";
    }

    public static int Main(string[] args)
    {
        Console.WriteLine("\nReflection.ParameterAttributes");

        // Get the Type and the method.

        Type Mytype = Type.GetType("paramatt");
        MethodBase Mymethodbase = Mytype.GetMethod("mymethod");

        // Display the method.
        Console.Write("\nMymethodbase = " + Mymethodbase);

        // Get the ParameterInfo array.
        ParameterInfo[] Myarray = Mymethodbase.GetParameters();

        // Get and display the attributes for the second parameter.
        ParameterAttributes Myparamattributes = Myarray[1].Attributes;

        Console.Write("\nFor the second parameter:\nMyparamattributes = " 
            + (int) Myparamattributes
            + ", which is an "
            + Myparamattributes.ToString());

        return 0;
    }
}

Version Information

.NET Framework

Supported in: 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Portable Class Library

Supported in: Portable Class Library

.NET for Windows Store apps

Supported in: Windows 8

Platforms

Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

Reference

System.Reflection Namespace

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