Decimal.Equals Method (Object)
Returns a value indicating whether this instance and a specified Object represent the same type and value.
Assembly: mscorlib (in mscorlib.dll)
Parameters
- value
-
Type:
System.Object
The object to compare with this instance.
Return Value
Type: System.Booleantrue if value is a Decimal and equal to this instance; otherwise, false.
Notes to Callers:
Compiler overload resolution may account for an apparent difference in the behavior of the two Equals method overloads. If an implicit conversion between the obj argument and a Decimal is defined and the argument is not typed as an Object, compilers may perform an implicit conversion and call the Equals(Decimal) method. Otherwise, they call the Equals(Object) method, which always returns false if its obj argument is not a Decimal value. The following example illustrates the difference in behavior between the two method overloads. In the case of all primitive integral types, including both signed and unsigned types, the first comparison returns true because the compiler automatically performs a widening conversion and calls the Equals(Decimal) method, whereas the second comparison returns false because the compiler calls the Equals(Object) method.
Module Example Dim value As Decimal = 112d Public Sub Main() Dim byte1 As Byte = 112 Console.WriteLine("value = byte1: {0,17}", value.Equals(byte1)) TestObjectForEquality(byte1) Dim short1 As Short = 112 Console.WriteLine("value = short1: {0,17}", value.Equals(short1)) TestObjectForEquality(short1) Dim int1 As Integer = 112 Console.WriteLine("value = int1: {0,19}", value.Equals(int1)) TestObjectForEquality(int1) Dim long1 As Long = 112 Console.WriteLine("value = long1: {0,18}", value.Equals(long1)) TestObjectForEquality(long1) Dim sbyte1 As SByte = 112 Console.WriteLine("value = sbyte1: {0,17}", value.Equals(sbyte1)) TestObjectForEquality(sbyte1) Dim ushort1 As UShort = 112 Console.WriteLine("value = ushort1: {0,17}", value.Equals(ushort1)) TestObjectForEquality(ushort1) Dim uint1 As UInteger = 112 Console.WriteLine("value = uint1: {0,19}", value.Equals(uint1)) TestObjectForEquality(uint1) Dim ulong1 As ULong = 112 Console.WriteLine("value = ulong1: {0,18}", value.Equals(ulong1)) TestObjectForEquality(ulong1) Dim sng1 As Single = 112 Console.WriteLine("value = sng1: {0,21}", value.Equals(sng1)) TestObjectForEquality(sng1) Dim dbl1 As Double = 112 Console.WriteLine("value = dbl1: {0,21}", value.Equals(dbl1)) TestObjectForEquality(dbl1) End Sub Private Sub TestObjectForEquality(obj As Object) Console.WriteLine("{0} ({1}) = {2} ({3}): {4}", value, value.GetType().Name, obj, obj.GetType().Name, value.Equals(obj)) Console.WriteLine() End Sub End Module ' The example displays the following output: ' value = byte1: True ' 112 (Double) = 112 (Byte): False ' ' value = short1: True ' 112 (Double) = 112 (Int16): False ' ' value = int1: True ' 112 (Double) = 112 (Int32): False ' ' value = long1: True ' 112 (Double) = 112 (Int64): False ' ' value = sbyte1: True ' 112 (Double) = 112 (SByte): False ' ' value = ushort1: True ' 112 (Double) = 112 (UInt16): False ' ' value = uint1: True ' 112 (Double) = 112 (UInt32): False ' ' value = ulong1: True ' 112 (Double) = 112 (UInt64): False ' ' value = dec1: True ' 112 (Double) = 112 (Decimal): False ' ' value = sng1: True ' 112 (Double) = 112 (Single): False
The following code example compares several Decimal and other objects to a reference Decimal value using the Equals method.
' Example of the Decimal.CompareTo and Decimal.Equals instance methods. Imports System Imports Microsoft.VisualBasic Module DecCompToEqualsObjDemo ' Get the exception type name; remove the namespace prefix. Function GetExceptionType( ex As Exception ) As String Dim exceptionType As String = ex.GetType( ).ToString( ) Return exceptionType.Substring( _ exceptionType.LastIndexOf( "."c ) + 1 ) End Function ' Compare the Decimal to the Object parameters, ' and display the Object parameters with the results. Sub CompDecimalToObject( Left as Decimal, Right as Object, _ RightText as String ) Console.WriteLine( "{0,-46}{1}", "Object: " & RightText, _ Right ) Console.WriteLine( "{0,-46}{1}", "Left.Equals( Object )", _ Left.Equals( Right ) ) Console.Write( "{0,-46}", "Left.CompareTo( Object )" ) ' Catch the exception if CompareTo( ) throws one. Try Console.WriteLine( "{0}" & vbCrLf, _ Left.CompareTo( Right ) ) Catch ex As Exception Console.WriteLine( "{0}" & vbCrLf, _ GetExceptionType( ex ) ) End Try End Sub Sub Main( ) Console.WriteLine( _ "This example of the Decimal.Equals( Object ) " & _ "and " & vbCrLf & "Decimal.CompareTo( Object ) " & _ "methods generates the " & vbCrLf & _ "following output. It creates several different " & _ "Decimal " & vbCrLf & "values and compares them " & _ "with the following reference value." & vbCrLf ) ' Create a reference Decimal value. Dim Left as New Decimal( 987.654 ) Console.WriteLine( "{0,-46}{1}" & vbCrLf, _ "Left: Decimal( 987.654 )", Left ) ' Create objects to compare with the reference. CompDecimalToObject( Left, New Decimal( 9.8765400E+2 ), _ "Decimal( 9.8765400E+2 )" ) CompDecimalToObject( Left, 987.6541D, "987.6541D" ) CompDecimalToObject( Left, 987.6539D, "987.6539D" ) CompDecimalToObject( Left, _ New Decimal( 987654000, 0, 0, false, 6 ), _ "Decimal( 987654000, 0, 0, false, 6 )" ) CompDecimalToObject( Left, 9.8765400E+2, _ "Double 9.8765400E+2" ) CompDecimalToObject( Left, "987.654", _ "String ""987.654""" ) End Sub End Module ' This example of the Decimal.Equals( Object ) and ' Decimal.CompareTo( Object ) methods generates the ' following output. It creates several different Decimal ' values and compares them with the following reference value. ' ' Left: Decimal( 987.654 ) 987.654 ' ' Object: Decimal( 9.8765400E+2 ) 987.654 ' Left.Equals( Object ) True ' Left.CompareTo( Object ) 0 ' ' Object: 987.6541D 987.6541 ' Left.Equals( Object ) False ' Left.CompareTo( Object ) -1 ' ' Object: 987.6539D 987.6539 ' Left.Equals( Object ) False ' Left.CompareTo( Object ) 1 ' ' Object: Decimal( 987654000, 0, 0, false, 6 ) 987.654000 ' Left.Equals( Object ) True ' Left.CompareTo( Object ) 0 ' ' Object: Double 9.8765400E+2 987.654 ' Left.Equals( Object ) False ' Left.CompareTo( Object ) ArgumentException ' ' Object: String "987.654" 987.654 ' Left.Equals( Object ) False ' Left.CompareTo( Object ) ArgumentException
Available since 8
.NET Framework
Available since 1.1
Portable Class Library
Supported in: portable .NET platforms
Silverlight
Available since 2.0
Windows Phone Silverlight
Available since 7.0
Windows Phone
Available since 8.1