Decimal.Equals Method (Decimal)


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Returns a value indicating whether this instance and a specified Decimal object represent the same value.

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

Public Function Equals (
	value As Decimal
) As Boolean


Type: System.Decimal

An object to compare to this instance.

Return Value

Type: System.Boolean

true if value is equal to this instance; otherwise, false.

This method implements the System.IEquatable(Of T) interface, and performs slightly better than Equals because it does not have to convert the value parameter to an object.

If value has fewer bits (is narrower) than the instance type, some programming languages perform an implicit widening conversion that transforms the value of the parameter into a value with more bits.

For example, suppose the instance type is Int32 and the parameter type is Byte. The Microsoft C# compiler generates instructions to represent the value of the parameter as an Int32 object, then generates a Int32.CompareTo method to compare the Int32 instance and parameter representation.

Consult your programming language's documentation to determine whether its compiler performs implicit widening conversions on numeric types.

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))

      Dim short1 As Short = 112
      Console.WriteLine("value = short1: {0,17}", value.Equals(short1))

      Dim int1 As Integer = 112
      Console.WriteLine("value = int1: {0,19}", value.Equals(int1))

      Dim long1 As Long = 112
      Console.WriteLine("value = long1: {0,18}", value.Equals(long1))

      Dim sbyte1 As SByte = 112
      Console.WriteLine("value = sbyte1: {0,17}", value.Equals(sbyte1))

      Dim ushort1 As UShort = 112
      Console.WriteLine("value = ushort1: {0,17}", value.Equals(ushort1))

      Dim uint1 As UInteger = 112
      Console.WriteLine("value = uint1: {0,19}", value.Equals(uint1))

      Dim ulong1 As ULong = 112
      Console.WriteLine("value = ulong1: {0,18}", value.Equals(ulong1))

      Dim sng1 As Single = 112
      Console.WriteLine("value = sng1: {0,21}", value.Equals(sng1))

      Dim dbl1 As Double = 112
      Console.WriteLine("value = dbl1: {0,21}", value.Equals(dbl1))
   End Sub

   Private Sub TestObjectForEquality(obj As Object)
      Console.WriteLine("{0} ({1}) = {2} ({3}): {4}",
                        value, value.GetType().Name,
                        obj, obj.GetType().Name,
   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

Universal Windows Platform
Available since 8
.NET Framework
Available since 2.0
Portable Class Library
Supported in: portable .NET platforms
Available since 2.0
Windows Phone Silverlight
Available since 7.0
Windows Phone
Available since 8.1
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