UInt64.Equals Method

Reference

Definition

Namespace:: System

Assembly:: System.Runtime.dll

Assembly:: mscorlib.dll

Assembly:: netstandard.dll

Important

Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.

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

Overloads

Equals(Object)	Returns a value indicating whether this instance is equal to a specified object.
Equals(UInt64)	Returns a value indicating whether this instance is equal to a specified UInt64 value.

Equals(Object)

Source:: UInt64.cs

Source:: UInt64.cs

Source:: UInt64.cs

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

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

obj: Object

An object to compare to this instance.

Returns

Boolean

true if obj is an instance of UInt64 and equals the value of this instance; otherwise, false.

Examples

The following example demonstrates the Equals method.

using System;

public class Example
{
   public static void Main()
   {
      object[] values = { (short) 10, (short) 20, 10, 20,
                          10L, 20L, 10D, 20D, (ushort) 10,
                          (ushort) 20, 10U, 20U,
                          10ul, 20ul };
      UInt64 baseValue = 20;
      String baseType = baseValue.GetType().Name;
      
      foreach (var value in values)
         Console.WriteLine("{0} ({1}) = {2} ({3}): {4}",
                           baseValue, baseType,
                           value, value.GetType().Name,
                           baseValue.Equals(value));
   }
}
// The example displays the following output:
//       20 (UInt64) = 10 (Int16): False
//       20 (UInt64) = 20 (Int16): False
//       20 (UInt64) = 10 (Int32): False
//       20 (UInt64) = 20 (Int32): False
//       20 (UInt64) = 10 (Int64): False
//       20 (UInt64) = 20 (Int64): False
//       20 (UInt64) = 10 (Double): False
//       20 (UInt64) = 20 (Double): False
//       20 (UInt64) = 10 (UInt16): False
//       20 (UInt64) = 20 (UInt16): False
//       20 (UInt64) = 10 (UInt32): False
//       20 (UInt64) = 20 (UInt32): False
//       20 (UInt64) = 10 (UInt64): False
//       20 (UInt64) = 20 (UInt64): True

let values: obj[] = 
    [| 10s; 20s; 10; 20
       10L; 20L; 10.; 20.; 10us
       20us; 10u; 20u
       10uL; 20uL |]
let baseValue = 20uL
let baseType = baseValue.GetType().Name

for value in values do
    printfn $"{baseValue} ({baseType}) = {value} ({value.GetType().Name}): {value.GetType().Name}"
// The example displays the following output:
//       20 (UInt64) = 10 (Int16): False
//       20 (UInt64) = 20 (Int16): False
//       20 (UInt64) = 10 (Int32): False
//       20 (UInt64) = 20 (Int32): False
//       20 (UInt64) = 10 (Int64): False
//       20 (UInt64) = 20 (Int64): False
//       20 (UInt64) = 10 (Double): False
//       20 (UInt64) = 20 (Double): False
//       20 (UInt64) = 10 (UInt16): False
//       20 (UInt64) = 20 (UInt16): False
//       20 (UInt64) = 10 (UInt32): False
//       20 (UInt64) = 20 (UInt32): False
//       20 (UInt64) = 10 (UInt64): False
//       20 (UInt64) = 20 (UInt64): True

Module Example
   Public Sub Main()
      Dim values() As Object = { 10S, 20S, 10I, 20I, 10L, 20L,
                                 10R, 20R, 10US, 20US, 10UI, 20UI,
                                 10UL, 20UL }
      Dim baseValue As UInt64 = 20
      Dim baseType As String = baseValue.GetType().Name
      
      For Each value In values
         Console.WriteLine("{0} ({1}) = {2} ({3}): {4}",
                           baseValue, baseType,
                           value, value.GetType().Name,
                           baseValue.Equals(value))
      Next
   End Sub
End Module
' The example displays the following output:
'       20 (UInt64) = 10 (Int16): False
'       20 (UInt64) = 20 (Int16): False
'       20 (UInt64) = 10 (Int32): False
'       20 (UInt64) = 20 (Int32): False
'       20 (UInt64) = 10 (Int64): False
'       20 (UInt64) = 20 (Int64): False
'       20 (UInt64) = 10 (Double): False
'       20 (UInt64) = 20 (Double): False
'       20 (UInt64) = 10 (UInt16): False
'       20 (UInt64) = 20 (UInt16): False
'       20 (UInt64) = 10 (UInt32): False
'       20 (UInt64) = 20 (UInt32): False
'       20 (UInt64) = 10 (UInt64): False
'       20 (UInt64) = 20 (UInt64): True

Notes to Callers

Compiler overload resolution may account for an apparent difference in the behavior of the two Equals(UInt64) 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.

using System;

public class Example
{
   static ulong value = 112;
   
   public static void Main()
   {
      byte byte1= 112;
      Console.WriteLine("value = byte1: {0,16}", value.Equals(byte1));
      TestObjectForEquality(byte1);

      short short1 = 112;
      Console.WriteLine("value = short1: {0,17}", value.Equals(short1));
      TestObjectForEquality(short1);

      int int1 = 112;
      Console.WriteLine("value = int1: {0,19}", value.Equals(int1));
      TestObjectForEquality(int1);

      sbyte sbyte1 = 112;
      Console.WriteLine("value = sbyte1: {0,17}", value.Equals(sbyte1));
      TestObjectForEquality(sbyte1);

      ushort ushort1 = 112;
      Console.WriteLine("value = ushort1: {0,16}", value.Equals(ushort1));
      TestObjectForEquality(ushort1);

      uint uint1 = 112;
      Console.WriteLine("value = uint1: {0,18}", value.Equals(uint1));
      TestObjectForEquality(uint1);

      decimal dec1 = 112m;
      Console.WriteLine("value = dec1: {0,21}", value.Equals(dec1));
      TestObjectForEquality(dec1);

      double dbl1 = 112;
      Console.WriteLine("value = dbl1: {0,20}", value.Equals(dbl1));
      TestObjectForEquality(dbl1);
   }

   private static void TestObjectForEquality(Object obj)
   {
      Console.WriteLine("{0} ({1}) = {2} ({3}): {4}\n",
                        value, value.GetType().Name,
                        obj, obj.GetType().Name,
                        value.Equals(obj));
   }
}
// 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

let value = 112uL

let testObjectForEquality (obj: obj) =
    printfn $"{value} ({value.GetType().Name}) = {obj} ({obj.GetType().Name}): {value.Equals obj}\n"

let byte1= 112uy
printfn $"value = byte1: {value.Equals byte1,16}"
testObjectForEquality byte1

let short1 = 112s
printfn $"value = short1: {value.Equals short1,17}"
testObjectForEquality short1

let int1 = 112
printfn $"value = int1: {value.Equals int1,19}"
testObjectForEquality int1

let sbyte1 = 112y
printfn $"value = sbyte1: {value.Equals sbyte1,17}"
testObjectForEquality sbyte1

let ushort1 = 112us
printfn $"value = ushort1: {value.Equals ushort1,16}"
testObjectForEquality ushort1

let uint1 = 112u
printfn $"value = uint1: {value.Equals uint1,18}"
testObjectForEquality uint1

let dec1 = 112m
printfn $"value = dec1: {value.Equals dec1,21}"
testObjectForEquality dec1

let dbl1 = 112.
printfn $"value = dbl1: {value.Equals dbl1,20}"
testObjectForEquality dbl1

// 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

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

Applies to

Equals(UInt64)

Source:: UInt64.cs

Source:: UInt64.cs

Source:: UInt64.cs

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

public:
 virtual bool Equals(System::UInt64 obj);

public bool Equals (ulong obj);

override this.Equals : uint64 -> bool

Public Function Equals (obj As ULong) As Boolean

Parameters

obj: UInt64

A UInt64 value to compare to this instance.

Returns

Boolean

true if obj has the same value as this instance; otherwise, false.

Implements

Equals(T)

Examples

The following example demonstrates the Equals method.

using namespace System;

int main()
{
      UInt64 value1 = 50;
      UInt64 value2 = 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));
}
// The example displays the following output:
//       value1:   Type: UInt64   Value: 50
//       value2:   Type: UInt64   Value: 50
//       value1 and value2 are equal: True

using System;

class Example
{
     public static void Main()
     {
         UInt64 value1 = 50;
         UInt64 value2 = 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));
     }
}
// The example displays the following output:
//       value1:   Type: UInt64   Value: 50
//       value2:   Type: UInt64   Value: 50
//       value1 and value2 are equal: True

let value1 = 50uL
let value2 = 50uL

// Display the values.
printfn $"value1:   Type: {value1.GetType().Name}   Value: {value1}"
printfn $"value2:   Type: {value2.GetType().Name}   Value: {value2}"

// Compare the two values.
printfn $"value1 and value2 are equal: {value1.Equals value2}"
// The example displays the following output:
//       value1:   Type: UInt64   Value: 50
//       value2:   Type: UInt64   Value: 50
//       value1 and value2 are equal: True

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

Remarks

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

Notes to Callers

using System;

public class Example
{
   static ulong value = 112;
   
   public static void Main()
   {
      byte byte1= 112;
      Console.WriteLine("value = byte1: {0,16}", value.Equals(byte1));
      TestObjectForEquality(byte1);

      short short1 = 112;
      Console.WriteLine("value = short1: {0,17}", value.Equals(short1));
      TestObjectForEquality(short1);

      int int1 = 112;
      Console.WriteLine("value = int1: {0,19}", value.Equals(int1));
      TestObjectForEquality(int1);

      sbyte sbyte1 = 112;
      Console.WriteLine("value = sbyte1: {0,17}", value.Equals(sbyte1));
      TestObjectForEquality(sbyte1);

      ushort ushort1 = 112;
      Console.WriteLine("value = ushort1: {0,16}", value.Equals(ushort1));
      TestObjectForEquality(ushort1);

      uint uint1 = 112;
      Console.WriteLine("value = uint1: {0,18}", value.Equals(uint1));
      TestObjectForEquality(uint1);

      decimal dec1 = 112m;
      Console.WriteLine("value = dec1: {0,21}", value.Equals(dec1));
      TestObjectForEquality(dec1);

      double dbl1 = 112;
      Console.WriteLine("value = dbl1: {0,20}", value.Equals(dbl1));
      TestObjectForEquality(dbl1);
   }

   private static void TestObjectForEquality(Object obj)
   {
      Console.WriteLine("{0} ({1}) = {2} ({3}): {4}\n",
                        value, value.GetType().Name,
                        obj, obj.GetType().Name,
                        value.Equals(obj));
   }
}
// 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

let value = 112uL

let testObjectForEquality (obj: obj) =
    printfn $"{value} ({value.GetType().Name}) = {obj} ({obj.GetType().Name}): {value.Equals obj}\n"

let byte1= 112uy
printfn $"value = byte1: {value.Equals byte1,16}"
testObjectForEquality byte1

let short1 = 112s
printfn $"value = short1: {value.Equals short1,17}"
testObjectForEquality short1

let int1 = 112
printfn $"value = int1: {value.Equals int1,19}"
testObjectForEquality int1

let sbyte1 = 112y
printfn $"value = sbyte1: {value.Equals sbyte1,17}"
testObjectForEquality sbyte1

let ushort1 = 112us
printfn $"value = ushort1: {value.Equals ushort1,16}"
testObjectForEquality ushort1

let uint1 = 112u
printfn $"value = uint1: {value.Equals uint1,18}"
testObjectForEquality uint1

let dec1 = 112m
printfn $"value = dec1: {value.Equals dec1,21}"
testObjectForEquality dec1

let dbl1 = 112.
printfn $"value = dbl1: {value.Equals dbl1,20}"
testObjectForEquality dbl1

// 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

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

Applies to

Share via

UInt64.Equals Method

Definition

Overloads

Equals(Object)

Parameters

Returns

Examples

Notes to Callers

See also

Applies to

Equals(UInt64)

Parameters

Returns

Implements

Examples

Remarks

Notes to Callers

Applies to

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