CallingConventions Enumeration

Members

	Member name	Description
	Standard	Specifies the default calling convention as determined by the common language runtime. Use this calling convention for static methods. For instance or virtual methods use HasThis.
	VarArgs	Specifies the calling convention for methods with variable arguments.
	Any	Specifies that either the Standard or the VarArgs calling convention may be used.
	HasThis	Specifies an instance or virtual method (not a static method). At run-time, the called method is passed a pointer to the target object as its first argument (the this pointer). The signature stored in metadata does not include the type of this first argument, because the method is known and its owner class can be discovered from metadata.
	ExplicitThis	Specifies that the signature is a function-pointer signature, representing a call to an instance or virtual method (not a static method). If ExplicitThis is set, HasThis must also be set. The first argument passed to the called method is still a this pointer, but the type of the first argument is now unknown. Therefore, a token that describes the type (or class) of the this pointer is explicitly stored into its metadata signature.

Imports System.Reflection
Imports System.Runtime.InteropServices

Class Example

   ' Methods to get:

   Public Overloads Sub MethodA(ByVal i As Integer, ByVal l As Long)

   End Sub

   Public Overloads Sub MethodA(ByVal i() As Integer)

   End Sub

   Public Overloads Sub MethodA(ByRef r As Integer)

   End Sub

   ' Method that takes an integer and an out parameter. Note that an
   ' Imports reference is needed to System.Runtime.InteropServices
   ' for the <OutAttribute>, which can be shortened to <Out>.
   Public Overloads Sub MethodA(ByVal i As Integer, <Out()> ByRef o As Integer)
      o = 100
   End Sub

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

      ' Get MethodA(ByVal i As Integer, ByVal l As Long)
      mInfo = GetType(Example).GetMethod("MethodA", _
          BindingFlags.Public Or BindingFlags.Instance, _
          Nothing, _
          CallingConventions.Any, _
          New Type() {GetType(System.Int32), _
          GetType(System.Int64)}, _
          Nothing)
      outputBlock.Text += String.Format("Found method: {0}", mInfo) & vbCrLf

      ' Get  MethodA(ByVal i() As Integer)
      mInfo = GetType(Example).GetMethod("MethodA", _
          BindingFlags.Public Or BindingFlags.Instance, _
          Nothing, _
          CallingConventions.Any, _
          New Type() {GetType(System.Int32())}, _
          Nothing)
      outputBlock.Text += String.Format("Found method: {0}", mInfo) & vbCrLf

      ' Get MethodA(ByRef r As Integer)
      mInfo = GetType(Example).GetMethod("MethodA", _
      BindingFlags.Public Or BindingFlags.Instance, _
      Nothing, _
      CallingConventions.Any, _
      New Type() {GetType(System.Int32).MakeByRefType}, _
      Nothing)
      outputBlock.Text += String.Format("Found method: {0}", mInfo) & vbCrLf

      ' Get MethodA(ByVal i As Integer, <Out()> ByRef o As Integer)
      mInfo = GetType(Example).GetMethod("MethodA", _
      BindingFlags.Public Or BindingFlags.Instance, _
      Nothing, _
      CallingConventions.Any, _
      New Type() {GetType(System.Int32), GetType(System.Int32).MakeByRefType}, _
      Nothing)
      outputBlock.Text += String.Format("Found method: {0}", mInfo) & vbCrLf

   End Sub
End Class

' This method produces the following output:
'
'Found method: Void MethodA(Int32, Int32)
'Found method: Void MethodA(Int32[])
'Found method: Void MethodA(Int32 ByRef)
'Found method: Void MethodA(Int32, Int32 ByRef)

using System;
using System.Reflection;

class Example
{
   // Methods to get:

   public void MethodA(int i, int j) { }

   public void MethodA(int[] i) { }

   public void MethodA(ref int r) { }

   // Method that takes an out parameter:
   public void MethodA(int i, out int o) { o = 100; }


   public static void Demo(System.Windows.Controls.TextBlock outputBlock)
   {
      MethodInfo mInfo;

      // Get MethodA(int i, int j)
      mInfo = typeof(Example).GetMethod("MethodA",
          BindingFlags.Public | BindingFlags.Instance,
          null,
          CallingConventions.Any,
          new Type[] { typeof(int), typeof(int) },
          null);
      outputBlock.Text += String.Format("Found method: {0}", mInfo) + "\n";

      // Get MethodA(int[] i)
      mInfo = typeof(Example).GetMethod("MethodA",
          BindingFlags.Public | BindingFlags.Instance,
          null,
          CallingConventions.Any,
          new Type[] { typeof(int[]) },
          null);
      outputBlock.Text += String.Format("Found method: {0}", mInfo) + "\n";

      // Get MethodA(ref int r)
      mInfo = typeof(Example).GetMethod("MethodA",
          BindingFlags.Public | BindingFlags.Instance,
          null,
          CallingConventions.Any,
          new Type[] { typeof(int).MakeByRefType() },
          null);
      outputBlock.Text += String.Format("Found method: {0}", mInfo) + "\n";

      // Get MethodA(int i, out int o)
      mInfo = typeof(Example).GetMethod("MethodA",
          BindingFlags.Public | BindingFlags.Instance,
          null,
          CallingConventions.Any,
          new Type[] { typeof(int), typeof(int).MakeByRefType() },
          null);
      outputBlock.Text += String.Format("Found method: {0}", mInfo) + "\n";

   }
}

/* This method produces the following output:

Found method: Void MethodA(Int32, Int32)
Found method: Void MethodA(Int32[])
Found method: Void MethodA(Int32 ByRef)
Found method: Void MethodA(Int32, Int32 ByRef)
  */