ValueType.Equals(Object) Method

public:
 override bool Equals(System::Object ^ obj);

public override bool Equals(object obj);

public override bool Equals(object? obj);

override this.Equals : obj -> bool

Public Overrides Function Equals (obj As Object) As Boolean

Parameters

Returns

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

Examples

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

public struct Complex
{
 public double m_Re;
 public double m_Im;

 public override bool Equals( object ob ){
 if( ob is Complex ) {
 Complex c = (Complex) ob;
 return m_Re==c.m_Re && m_Im==c.m_Im;
 }
 else {
 return false;
 }
 }

 public override int GetHashCode(){
 return m_Re.GetHashCode() ^ m_Im.GetHashCode();
 }
}

type Complex() =
 member val m_Re = 0. with get, set
 member val m_Im = 0. with get, set

 override this.Equals(ob) =
 match ob with
 | :? Complex as c ->
 this.m_Re = c.m_Re && this.m_Im = c.m_Im
 | _ -> false
 
 override this.GetHashCode() =
 this.m_Re.GetHashCode() ^^^ this.m_Im.GetHashCode()

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
 Else
 Return False
 End If
 End Function
 
 
 Public Overloads Function GetHashCode() As Integer
 Return m_Re.GetHashCode() ^ m_Im.GetHashCode()
 End Function

End Structure

Remarks

The ValueType.Equals(Object) method overrides Object.Equals(Object) and provides the default implementation of value equality for all value types in .NET.

The default implementation calls Object.Equals(Object) on each field of the current instance and obj and returns true if all fields are equal.

.NET 9 and later, the default implementation of ValueType.Equals(Object) throws NotSupportedException if InlineArrayAttribute is applied to the type.

Notes for the Windows Runtime

When you call the Equals method on a Windows Runtime structure, it provides the default behavior for value types that don't override Equals. This is part of the support that .NET provides for the Windows Runtime (see .NET Support for Windows Store Apps and Windows Runtime). Windows Runtime structures can't override Equals, even if they're written with C# or Visual Basic, because they can't have methods. (In addition, structures in the Windows Runtime itself don't inherit ValueType.) However, they appear to have ToString, Equals, and GetHashCode methods when you use them in your C# or Visual Basic code, and .NET provides the default behavior for these methods.