Type.GetMethod Method (String, array<Type>[]()[])

[ This article is for Windows Phone 8 developers. If you’re developing for Windows 10, see the latest documentation. ]

Searches for the specified public method whose parameters match the specified argument types.

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

Syntax

Public Function GetMethod ( _
    name As String, _
    types As Type() _
) As MethodInfo
public MethodInfo GetMethod(
    string name,
    Type[] types
)

Parameters

  • types
    Type: array<System..::.Type>[]()[]
    An array of Type objects representing the number, order, and type of the parameters for the method to get.
    -or-
    An empty array of Type objects (as provided by the EmptyTypes field) to get a method that takes no parameters.

Return Value

Type: System.Reflection..::.MethodInfo
A MethodInfo object representing the public method whose parameters match the specified argument types, if found; otherwise, nullNothingnullptra null reference (Nothing in Visual Basic).

Exceptions

Exception Condition
AmbiguousMatchException

More than one method is found with the specified name and specified parameters.

ArgumentNullException

name is nullNothingnullptra null reference (Nothing in Visual Basic).

-or-

types is nullNothingnullptra null reference (Nothing in Visual Basic).

-or-

One of the elements in types is nullNothingnullptra null reference (Nothing in Visual Basic).

ArgumentException

types is multidimensional.

Remarks

The search for name is case-sensitive. The search includes public static and public instance methods.

Note

You cannot omit parameters when looking up constructors and methods. You can only omit parameters when invoking.

If the current T:System.Type represents a constructed generic type, this method returns the MethodInfo with the type parameters replaced by the appropriate type arguments.

If the current Type represents a type parameter in the definition of a generic type or generic method, this method searches the methods of the class constraint, or the methods of Object if there is no class constraint.

Note

The name parameter cannot include type arguments. For example, the C# code GetMethod("MyGenericMethod<int>") searches for a method with the text name "MyGenericMethod<int>", rather than for a method named MyGenericMethod that has one generic argument of type int. Instead, use GetMethod("MyGenericMethod") with the appropriate parameter in the types array.

Examples

The following example finds specific overloads of MethodA, specifying a variety of argument types.


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 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(i As Integer i, l As Long)
      mInfo = GetType(Example).GetMethod("MethodA", New Type() {GetType(Integer), GetType(Long)})
      outputBlock.Text += String.Format("Found method: {0}", mInfo) & vbCrLf

      ' Get  MethodA(i As Integer())
      mInfo = GetType(Example).GetMethod("MethodA", New Type() {GetType(Integer())})
      outputBlock.Text += String.Format("Found method: {0}", mInfo) & vbCrLf

      ' Get MethodA(ByRef r As Integer)
      mInfo = GetType(Example).GetMethod("MethodA", New Type() {GetType(Integer).MakeByRefType})
      outputBlock.Text += String.Format("Found method: {0}", mInfo) & vbCrLf

      ' Get MethodA(i As Integer, ByRef r As Integer)
      mInfo = GetType(Example).GetMethod("MethodA", New Type() {GetType(Integer), _
          GetType(Integer).MakeByRefType})
      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 i)
      mInfo = typeof(Example).GetMethod("MethodA",
          new Type[] { typeof(int), typeof(int) });
      outputBlock.Text += String.Format("Found method: {0}", mInfo) + "\n";

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

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

      // Get MethodA(int i, out int o)
      mInfo = typeof(Example).GetMethod("MethodA",
          new Type[] { typeof(int), typeof(int).MakeByRefType() });
      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)
  */

Version Information

Windows Phone OS

Supported in: 8.1, 8.0, 7.1, 7.0

Platforms

Windows Phone

See Also

Reference

Type Class

GetMethod Overload

System Namespace

MethodInfo

String

DefaultBinder

GetMethodImpl

GetMethods