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UInt64.Equals Method (UInt64)

Returns a value indicating whether this instance is equal to a specified UInt64 value.

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

'Declaration
Public Function Equals ( _
	obj As ULong _
) As Boolean

Parameters

obj
Type: System.UInt64

A UInt64 value to compare to this instance.

Return Value

Type: System.Boolean
true if obj has the same value as this instance; otherwise, false.

Implements

IEquatable(Of T).Equals(T)

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

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 UInt64 is defined and the argument is not typed as an Object, compilers perform an implicit conversion and call the Equals(UInt64) method. Otherwise, they call the Equals(Object) method, which always returns false if its obj argument is not a UInt64 value. The following example illustrates the difference in behavior between the two method overloads. In the case of the Byte, UInt16, and UInt32 values, the first comparison returns true because the compiler automatically performs a widening conversion and calls the Equals(UInt64) method, whereas the second comparison returns false because the compiler calls the Equals(Object) method.

Module Example
   Dim value As UInt64 = 112

   Public Sub Main()
      Dim byte1 As Byte = 112
      Console.WriteLine("value = byte1: {0,16}", 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 sbyte1 As SByte = 112
      Console.WriteLine("value = sbyte1: {0,17}", value.Equals(sbyte1))
      TestObjectForEquality(sbyte1)

      Dim ushort1 As UShort = 112
      Console.WriteLine("value = ushort1: {0,16}", value.Equals(ushort1))
      TestObjectForEquality(ushort1)

      Dim uint1 As UInteger = 112
      Console.WriteLine("value = uint1: {0,18}", value.Equals(uint1))
      TestObjectForEquality(uint1)

      Dim dec1 As Decimal = 112d
      Console.WriteLine("value = dec1: {0,21}", value.Equals(dec1))
      TestObjectForEquality(dec1)

      Dim dbl1 As Double = 112
      Console.WriteLine("value = dbl1: {0,20}", 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 (UInt64) = 112 (Byte): False 

'       value = short1:             False 
'       112 (UInt64) = 112 (Int16): False 

'       value = int1:               False 
'       112 (UInt64) = 112 (Int32): False 

'       value = sbyte1:             False 
'       112 (UInt64) = 112 (SByte): False 

'       value = ushort1:             True 
'       112 (UInt64) = 112 (UInt16): False 

'       value = uint1:               True 
'       112 (UInt64) = 112 (UInt32): False 

'       value = dec1:                 False 
'       112 (UInt64) = 112 (Decimal): False 

'       value = dbl1:                False 
'       112 (UInt64) = 112 (Double): False

The following example demonstrates the Equals method.

Class Example
   Public Shared Sub Main()
      Dim value1 As UInt64 = 50
      Dim value2 As UInt64 = 50

      'Display the values.
      Console.WriteLine("value1:   Type: {0}   Value: {1}",
                        value1.GetType().Name, value1)
      Console.WriteLine("value2:   Type: {0}   Value: {1}",
                        value2.GetType().Name, value2)

      ' Compare the two values.
      Console.WriteLine("value1 and value2 are equal: {0}",
                        value1.Equals(value2))
   End Sub 
End Class  
' The example displays the following output: 
'       value1:   Type: UInt64   Value: 50 
'       value2:   Type: UInt64   Value: 50 
'       value1 and value2 are equal: True

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

XNA Framework

Supported in: 3.0, 2.0, 1.0

Portable Class Library

Supported in: Portable Class Library

Supported in: Windows Phone 8.1

Supported in: Windows Phone Silverlight 8.1

Supported in: Windows Phone Silverlight 8
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