ParameterAttributes Enum

Definition

Namespace:

System.Reflection

Assembly:

System.Runtime.dll

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

This enumeration supports a bitwise combination of its member values.

public enum class ParameterAttributes

[System.Flags]
public enum ParameterAttributes

[<System.Flags>]
type ParameterAttributes = 

Public Enum ParameterAttributes

Inheritance

Object

ValueType

Enum

ParameterAttributes

Attributes

FlagsAttribute

Fields

Name	Value	Description
None	0	Specifies that there is no parameter attribute.
In	1	Specifies that the parameter is an input parameter.
Out	2	Specifies that the parameter is an output parameter.
Lcid	4	Specifies that the parameter is a locale identifier (lcid).
Retval	8	Specifies that the parameter is a return value.
Optional	16	Specifies that the parameter is optional.
HasDefault	4096	Specifies that the parameter has a default value.
HasFieldMarshal	8192	Specifies that the parameter has field marshaling information.
Reserved3	16384	Reserved.
Reserved4	32768	Reserved.
ReservedMask	61440	Specifies that the parameter is reserved.

Examples

The following example displays the attributes of the specified parameter.

using namespace System;
using namespace System::Reflection;
using namespace System::Runtime::InteropServices;
public ref class paramatt
{
public:
   static void mymethod( String^ str1, [Out]interior_ptr<String^> str2, interior_ptr<String^> str3 )
   {
       *str2 = "string";
   }

};

int main()
{
   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 = {0}", Mymethodbase );
   
   // Get the ParameterInfo array.
   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 = {0}, which is an {1}", (int)Myparamattributes, Myparamattributes );
   return 0;
}

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;
    }
}

Imports System.Reflection

Class paramatt

    Public Shared Sub mymethod(ByVal str1 As String, ByRef str2 As String, _
    ByRef str3 As String)
        str2 = "string"
    End Sub

    Public Shared Function Main() As Integer
        Console.WriteLine(ControlChars.CrLf + "Reflection.ParameterAttributes")

        ' Get the Type and the method.
        Dim Mytype As Type = Type.GetType("paramatt")
        Dim Mymethodbase As MethodBase = Mytype.GetMethod("mymethod")

        ' Display the method.
        Console.WriteLine("Mymethodbase = " + Mymethodbase.ToString())

        ' Get the ParameterInfo array.
        Dim Myarray As ParameterInfo() = Mymethodbase.GetParameters()

        ' Get and display the attributes for the second parameter.
        Dim Myparamattributes As ParameterAttributes = Myarray(1).Attributes

        Console.WriteLine("For the second parameter:" + ControlChars.CrLf _
           + "Myparamattributes = " + CInt(Myparamattributes).ToString() _
           + ", which is a " + Myparamattributes.ToString())

        Return 0
    End Function
End Class

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.