ValueType.Equals Method (Object)

Indicates whether this instance and a specified object are equal.

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

Public Overrides Function Equals ( _
	obj As Object _
) As Boolean
Dim instance As ValueType
Dim obj As Object
Dim returnValue As Boolean

returnValue = instance.Equals(obj)
public boolean Equals (
	Object obj
public override function Equals (
	obj : Object
) : boolean
Not applicable.



Another object to compare to.

Return Value

true if obj and this instance are the same type and represent the same value; otherwise, false.

The default implementation of the Equals method uses reflection to compare the corresponding fields of obj and this instance. Override the Equals method for a particular type to improve the performance of the method and more closely represent the concept of equality for the type.

The following example demonstrates how the Equals method can be overridden by a derived value type.

Public Structure Complex
   Private m_Re As Double
   Private m_Im As Double
   Public Overloads Function Equals(ob As Object) As Boolean
      If TypeOf ob Is Complex Then
         Dim c As Complex = CType(ob, Complex)
         Return m_Re = c.m_Re And m_Im = c.m_Im
         Return False
      End If
   End Function
   Public Overloads Function GetHashCode() As Integer
      Return m_Re.GetHashCode() ^ m_Im.GetHashCode()
   End Function

End Structure

public class Complex
    public double mRe;
    public double mIm;

    public boolean Equals(Object ob)
        if (ob instanceof Complex) {
            Complex c = (Complex)ob;
            return mRe == c.mRe && mIm == c.mIm;
        else {
            return false;
    } //Equals

    public int GetHashCode()
        return ((System.Double)mRe).GetHashCode() ^ ((System.Double)mIm).
    } //GetHashCode
} //Complex

public class Complex 
    public var m_Re : double;
    public var m_Im : double;

    public override function Equals( ob ) : Boolean{
        if( ob.GetType() == Complex ) {
            var c : Complex = Complex(ob);
            return m_Re==c.m_Re && m_Im==c.m_Im;
        else {
            return false;

    public override function GetHashCode() : int{
        return m_Re.GetHashCode() ^ m_Im.GetHashCode();
            public static function main() {
                   var x : Complex = new Complex();
                   x.m_Re = 1;
                   x.m_Im = 2;
                   var y : Complex = new Complex();
                   y.m_Re = 2;
                   y.m_Im = 1;

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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