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Type.GetMethod Method (String, BindingFlags, Binder, CallingConventions, Type[], ParameterModifier[])

.NET Framework 1.1

Searches for the specified method whose parameters match the specified argument types and modifiers, using the specified binding constraints and the specified calling convention.

[Visual Basic]
Overloads Public Function GetMethod( _
   ByVal name As String, _
   ByVal bindingAttr As BindingFlags, _
   ByVal binder As Binder, _
   ByVal callConvention As CallingConventions, _
   ByVal types() As Type, _
   ByVal modifiers() As ParameterModifier _
) As MethodInfo
[C#]
public MethodInfo GetMethod(
 string name,
 BindingFlags bindingAttr,
 Binder binder,
 CallingConventions callConvention,
 Type[] types,
 ParameterModifier[] modifiers
);
[C++]
public: MethodInfo* GetMethod(
 String* name,
 BindingFlags bindingAttr,
 Binder* binder,
 CallingConventions callConvention,
 Type* types[],
 ParameterModifier modifiers[]
);
[JScript]
public function GetMethod(
   name : String,
 bindingAttr : BindingFlags,
 binder : Binder,
 callConvention : CallingConventions,
 types : Type[],
 modifiers : ParameterModifier[]
) : MethodInfo;

Parameters

name
The String containing the name of the method to get.
bindingAttr
A bitmask comprised of one or more BindingFlags that specify how the search is conducted.

-or-

Zero, to return a null reference (Nothing in Visual Basic).

binder
A Binder object that defines a set of properties and enables binding, which can involve selection of an overloaded method, coercion of argument types, and invocation of a member through reflection.

-or-

A null reference (Nothing in Visual Basic), to use the DefaultBinder.

callConvention
The CallingConventions object that specifies the set of rules to use regarding the order and layout of arguments, how the return value is passed, what registers are used for arguments, and how the stack is cleaned up.
types
An array of Type objects representing the number, order, and type of the parameters for the method to get.

-or-

An empty array of the type Type (that is, Type[] types = new Type[0]) to get a method that takes no parameters.

modifiers
An array of ParameterModifier objects representing the attributes associated with the corresponding element in the types array. The default binder does not process this parameter.

Return Value

A MethodInfo object representing the method that matches the specified requirements, if found; otherwise, a null reference (Nothing in Visual Basic).

Exceptions

Exception Type Condition
AmbiguousMatchException More than one method is found with the specified name and matching the specified binding constraints.
ArgumentNullException name is a null reference (Nothing in Visual Basic).

-or-

types is a null reference (Nothing).

-or-

One of the elements in types is a null reference (Nothing).

ArgumentException types is multidimensional.

-or-

modifiers is multidimensional.

-or-

types and modifiers do not have the same length.

Remarks

Although the default binder does not process ParameterModifier (the modifiers parameter), you can use the abstract System.Reflection.Binder class to write a custom binder that does process modifiers. ParameterModifier is only used when calling through COM interop, and only parameters that are passed by reference are handled.

The following table shows what members of a base class are returned by the GetXXX methods when reflecting on a type.

Member Type Static Non-Static
Constructor No No
Field No Yes. A field is always hide-by-name-and-signature.
Event Not applicable The common type system rule is that the inheritance is the same as that of the methods that implement the property. Reflection treats properties as hide-by-name-and-signature. See note 2 below.
Method No Yes. A method (both virtual and non-virtual) can be hide-by-name or hide-by-name-and-signature.
Nested Type No No
Property Not applicable The common type system rule is that the inheritance is the same as that of the methods that implement the property. Reflection treats properties as hide-by-name-and-signature. See note 2 below.
  1. Hide-by-name-and-signature considers all of the parts of the signature, including custom modifiers, return types, parameter types, sentinels, and unmanaged calling conventions. This is a binary comparison.
  2. For reflection, properties and events are hide-by-name-and-signature. If you have a property with both a get and a set accessor in the base class, but the derived class has only a get accessor, the derived class property hides the base class property, and you will not be able to access the setter on the base class.
  3. Custom attributes are not part of the common type system.

The types array and the modifiers array have the same length. A parameter specified in the types array can have the following attributes, which are specified in the modifiers array: pdIn, pdOut, pdLcid, pdRetval, pdOptional, and pdHasDefault, which represent [In], [Out], [lcid], [retval], [optional], and a value specifying whether the parameter has a default value. A parameter's associated attributes are stored in the metadata and enhance interoperability.

The following BindingFlags filter flags can be used to define which methods to include in the search:

  • You must specify either BindingFlags.Instance or BindingFlags.Static in order to get a return.
  • Specify BindingFlags.Public to include public methods in the search.
  • Specify BindingFlags.NonPublic to include non-public methods (that is, private and protected members) in the search.
  • Specify BindingFlags.FlattenHierarchy to include static methods up the hierarchy.

The following BindingFlags modifier flags can be used to change how the search works:

  • BindingFlags.IgnoreCase to ignore the case of name.
  • BindingFlags.DeclaredOnly to search only the methods declared on the Type, not methods that were simply inherited.

See System.Reflection.BindingFlags for more information.

If the requested type is non-public and the caller does not have ReflectionPermission to reflect non-public objects outside the current assembly, this method returns a null reference (Nothing in Visual Basic).

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

Example

[Visual Basic, C#, C++] The following example displays information about a method named MyFunc in the class MyClass.

[Visual Basic] 

Imports System
Imports System.Reflection
Imports Microsoft.VisualBasic

Public Class [MyClass]
    Public i As Integer = 10
    Public j As Integer = 2
    Public Function MyFunc(ByVal i As Integer, ByVal j As Integer) As Integer
        Dim k As Integer
        k = i * 10 - j
        Return k
    End Function 'MyFunc
End Class '[MyClass]

Public Class Type_GetMethod
    Public Shared Sub Main()
        Try
            ' Get the type of MyClass.
            Dim myType As Type = GetType([MyClass])
            ' Get information for MyFunc(int, int).
            Dim myMemberInfo As MemberInfo = myType.GetMethod("MyFunc", BindingFlags.Public Or BindingFlags.Instance, Nothing, CallingConventions.Any, New Type() {GetType(Integer), GetType(Integer)}, Nothing)
            Console.WriteLine(ControlChars.NewLine + "Displaying method MyFunc: " + ControlChars.NewLine)
            ' Display the method information.
            Console.WriteLine("{0}", myMemberInfo)
        Catch e As Exception
            Console.WriteLine("Exception : {0}", e.Message.ToString())
        End Try
    End Sub 'Main '
End Class 'Type_GetMethod

[C#] 

using System;
using System.Reflection;

public class MyClass
{
    public int i = 10;
    public int j = 2;
    public int MyFunc(int i , int j)
    {
        int k;
        k = i * 10 - j;
        return k;
    }
}
public class Type_GetMethod
{
    public static void Main()
    {
        try
        {
            // Get the type of MyClass.
            Type myType = typeof(MyClass);
            // Get the method information for MyFunc(int, int).
            MemberInfo myMemberInfo = myType.GetMethod("MyFunc", BindingFlags.Public |
                BindingFlags.Instance, 
                null, 
                CallingConventions.Any,  
                new Type[] {typeof(int),typeof(int)}, 
                null);
            Console.WriteLine("\nDisplaying information for MyFunc: \n");
            // Display the method information.
            Console.WriteLine("{0}", myMemberInfo);
        }
        catch(Exception e)
        {
            Console.WriteLine("Exception : {0}", e.Message);
        }
    }
}

[C++] 

#using <mscorlib.dll>

using namespace System;
using namespace System::Reflection;

public __gc class MyClass {
public:
   int  i;
   int  j;
   int MyFunc(int i , int j) {
      int k;
      k = i * 10 - j;
      return k;
   }
};

int main() {
   try {
      // Get the type of MyClass.
      Type*  myType = __typeof(MyClass);
      // Get the method information for MyFunc(int, int).
      Type* temp0 [] = {__typeof(int), __typeof(int)};
      MemberInfo*  myMemberInfo = myType->GetMethod(S"MyFunc",
         static_cast<BindingFlags>(BindingFlags::Public | BindingFlags::Instance),
         0,
         CallingConventions::Any,
         temp0,
         0);
      Console::WriteLine(S"\nDisplaying information for MyFunc: \n");
      // Display the method information.
      Console::WriteLine(S"{0}", myMemberInfo);
   } catch (Exception* e) {
      Console::WriteLine(S"Exception : {0}", e->Message);
   }
}

[JScript] No example is available for JScript. To view a Visual Basic, C#, or C++ example, click the Language Filter button Language Filter in the upper-left corner of the page.

Requirements

Platforms: Windows 98, Windows NT 4.0, Windows Millennium Edition, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 family, .NET Compact Framework

.NET Framework Security: 

See Also

Type Class | Type Members | System Namespace | Type.GetMethod Overload List | MethodInfo | String | BindingFlags | Binder | DefaultBinder | CallingConventions | ParameterModifier | ReflectionPermission | GetMethodImpl | GetMethods

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