ParameterAttributes Enumeration

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.
	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.
	Lcid	Specifies that the parameter is a locale identifier. Not supported. Present in Silverlight for Windows Phone.

Imports System.Reflection
Imports System.Runtime.InteropServices

Class Example

   Public Shared Sub mymethod(ByVal str1 As String, ByRef str2 As String, _
      <Out> ByRef str3 As String, <InAttribute> ByVal str4 As String)

      ' Add str1 to str2, which is ByRef.
      str2 &= str1
      ' When mymethod is called, str3 has no value. Give it one.
      str3 = "new value"
   End Sub

   Public Shared Sub Demo(ByVal outputBlock As System.Windows.Controls.TextBlock) 

      ' Get the method.
      Dim mm As MethodInfo = GetType(Example).GetMethod("mymethod")

      ' Display the method.
      outputBlock.Text &= "MethodInfo.ToString(): " & mm.ToString() & vbCrLf

      For Each param In mm.GetParameters()

         outputBlock.Text &= String.Format("Attributes for parameter {0}, ""{1}"": {2} ({3})", _ 
            param.Position, param.Name, param.Attributes, CInt(param.Attributes))

         If param.ParameterType.IsByRef Then
            outputBlock.Text &= "; the parameter type is ByRef" & vbLf
         Else
            outputBlock.Text &= vbLf
         End If
      Next
   End Sub
End Class

' This code produces the following output:
'
'MethodInfo.ToString(): Void mymethod(System.String, System.String ByRef, System.String ByRef)
'Attributes for parameter 0, "str1": None (0)
'Attributes for parameter 1, "str2": None (0); the parameter type is ByRef
'Attributes for parameter 2, "str3": Out (2); the parameter type is ByRef
'Attributes for parameter 3, "str4": In (1)

using System;
using System.Reflection;
using System.Runtime.InteropServices;

class Example
{
   public static void mymethod(string str1, ref string str2, out string str3,
      [In] string str4)
   {
      // Concatenate str1 to str2, which is ref.
      str2 += str1;
      // When mymethod is called, str3 has no value. Give it one.
      str3 = "new value";
   }

   public static void Demo(System.Windows.Controls.TextBlock outputBlock)
   {
      MethodInfo mm = typeof(Example).GetMethod("mymethod");

      // Display the method.
      outputBlock.Text += "MethodInfo.ToString(): " + mm.ToString() + "\n";

      // Get and display the attributes for the second parameter.
      foreach (ParameterInfo param in mm.GetParameters())
      {
         outputBlock.Text += String.Format("Attributes for parameter {0}, \"{1}\": {2} ({3})",  
            param.Position, param.Name, param.Attributes, (int)param.Attributes);

         if (param.ParameterType.IsByRef)
         {
            outputBlock.Text += "; the parameter type is ref\n";
         }
         else
         {
            outputBlock.Text += "\n";
         }
      }
   }
}

/* This code produces the following output:

MethodInfo.ToString(): Void mymethod(System.String, System.String ByRef, System.String ByRef)
Attributes for parameter 0, "str1": None (0)
Attributes for parameter 1, "str2": None (0); the parameter type is ByRef
Attributes for parameter 2, "str3": Out (2); the parameter type is ByRef
Attributes for parameter 3, "str4": In (1)
 */