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MethodInfo.GetBaseDefinition Method

When overridden in a derived class, returns the MethodInfo object for the method on the direct or indirect base class in which the method represented by this instance was first declared.

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

public abstract MethodInfo GetBaseDefinition ()
public abstract MethodInfo GetBaseDefinition ()
public abstract function GetBaseDefinition () : MethodInfo
Not applicable.

Return Value

A MethodInfo object for the first implementation of this method.

GetBaseDefinition returns the first definition of the specified method in the class hierarchy.

If the method is declared on an interface, GetBaseDefinition returns the method.

If the method is defined in a base class, then GetBaseDefinition works as follows:

  • If a given method overrides a virtual definition in the base class, the virtual definition is returned.

  • If a given method is specified with the new keyword (as in newslot as described in Type Members), the given method is returned.

  • If the method is not defined in the type of the object on which GetBaseDefinition is called, the method definition highest in the class hierarchy is returned.

To get the GetBaseDefinition method, first get the class Type. From the Type, get the MethodInfo. From the MethodInfo, get the GetBaseDefinition.

This code example demonstrates the behavior of GetBaseDefinition.

using System;
using System.Reflection;

public class GetBaseDef {
    public static void Main(String[] args)
    {
    Type t = typeof(B);
    MethodInfo m;

    // Print A Void B().
    m = t.GetMethod("B");
    Console.WriteLine(m.GetBaseDefinition().DeclaringType + " " + m.GetBaseDefinition());

    // Print A Void C().
    m = t.GetMethod("C");
    Console.WriteLine(m.GetBaseDefinition().DeclaringType + " " + m.GetBaseDefinition());

    // Print B Void D().
    m = t.GetMethod("D", (BindingFlags.Public |
                  BindingFlags.Instance |
                  BindingFlags.DeclaredOnly));
    Console.WriteLine(m.GetBaseDefinition().DeclaringType + " " + m.GetBaseDefinition());
    }

}

public class A
{
    public virtual void B() { Console.WriteLine("C"); }
    public virtual void C() { Console.WriteLine("C"); }
    public virtual void D() { Console.WriteLine("E"); }
}

public class B : A
{
    public override void C() { Console.WriteLine("C"); }
    public new void D()  { Console.WriteLine("D"); }
}

import System.*;
import System.Reflection.*;

public class GetBaseDef
{   
    public static void main(String[] args)
    {
        Type t = B.class.ToType();
        MethodInfo m;

        // Print A Void B().
        m = t.GetMethod("B");
        Console.WriteLine((m.GetBaseDefinition().get_DeclaringType() + " " 
            + m.GetBaseDefinition()));

        // Print A Void C().
        m = t.GetMethod("C");
        Console.WriteLine((m.GetBaseDefinition().get_DeclaringType() + " " 
            + m.GetBaseDefinition()));

        // Print B Void D().
        m = t.GetMethod("D",BindingFlags.Public | BindingFlags.Instance
            | BindingFlags.DeclaredOnly);
        Console.WriteLine((m.GetBaseDefinition().get_DeclaringType() + " " 
            + m.GetBaseDefinition()));
    } //main
} //GetBaseDef
 
public class A
{   
    public void B()
    {
        Console.WriteLine("C");
    } //B

    public void C()
    {
        Console.WriteLine("C");
    } //C

    public void D()
    {
        Console.WriteLine("E");
    } //D
} //A
 
public class B extends A
{   
    public void C()
    {
        Console.WriteLine("C");
    } //C

    public void D() 
    {
        Console.WriteLine("D");
    } //D
} //B 

import System;
import System.Reflection;

public class GetBaseDef {
    public static function Main() : void 
    {
    var t : Type = B;
    var m : MethodInfo;

    // Print A Void B().
    m = t.GetMethod("B");
    Console.WriteLine(m.GetBaseDefinition().DeclaringType + " " + m.GetBaseDefinition());

    // Print A Void C().
    m = t.GetMethod("C");
    Console.WriteLine(m.GetBaseDefinition().DeclaringType + " " + m.GetBaseDefinition());

    // Print B Void D().
    m = t.GetMethod("D", (BindingFlags.Public |
                  BindingFlags.Instance |
                  BindingFlags.DeclaredOnly));
    Console.WriteLine(m.GetBaseDefinition().DeclaringType + " " + m.GetBaseDefinition());
    }
}

GetBaseDef.Main();

public class A
{
    public function B() : void  { Console.WriteLine("C"); }
    public function C() : void { Console.WriteLine("C"); }
    public function D() : void { Console.WriteLine("E"); }
}

public class B extends A
{
    public override function C() : void { Console.WriteLine("C"); }
    public hide function D() : void { Console.WriteLine("D"); }
}

Windows 98, Windows Server 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 2.0, 1.0

XNA Framework

Supported in: 1.0

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