Int64.Equals Int64.Equals Int64.Equals Int64.Equals Method

Definition

Returns a value indicating whether this instance is equal to a specified object or Int64.

Overloads

Equals(Int64) Equals(Int64) Equals(Int64) Equals(Int64)

Returns a value indicating whether this instance is equal to a specified Int64 value.

Equals(Object) Equals(Object) Equals(Object) Equals(Object)

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

Equals(Int64) Equals(Int64) Equals(Int64) Equals(Int64)

Returns a value indicating whether this instance is equal to a specified Int64 value.

public:
 virtual bool Equals(long obj);
public bool Equals (long obj);
override this.Equals : int64 -> bool
Public Function Equals (obj As Long) As Boolean

Parameters

obj
Int64 Int64 Int64 Int64

An Int64 value to compare to this instance.

Returns

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

Implements

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

Compiler overload resolution may account for an apparent difference in the behavior of the two Equals(Int64) method overloads. If an implicit conversion between the obj argument and an Int64 is defined and the argument is not typed as an Object, compilers perform an implicit conversion and call the Equals(Int64) method. Otherwise, they call the Equals(Object) method, which always returns false if its obj argument is not an Int64 value. The following example illustrates the difference in behavior between the two method overloads. In the case of the Byte, SByte, Int16, UInt16, Int32, and UInt32 values, the first comparison returns true because the compiler automatically performs a widening conversion and calls the Equals(Int64) method, whereas the second comparison returns false because the compiler calls the Equals(Object) method.

using System;

public class Example
{
   static long value = 112;
   
   public static void Main()
   {
      byte byte1= 112;
      Console.WriteLine("value = byte1: {0,15}", value.Equals(byte1));
      TestObjectForEquality(byte1);

      short short1 = 112;
      Console.WriteLine("value = short1: {0,15}", value.Equals(short1));
      TestObjectForEquality(short1);

      int int1 = 112;
      Console.WriteLine("value = int1: {0,17}", value.Equals(int1));
      TestObjectForEquality(int1);

      sbyte sbyte1 = 112;
      Console.WriteLine("value = sbyte1: {0,15}", value.Equals(sbyte1));
      TestObjectForEquality(sbyte1);

      ushort ushort1 = 112;
      Console.WriteLine("value = ushort1: {0,15}", value.Equals(ushort1));
      TestObjectForEquality(ushort1);

      uint uint1 = 112;
      Console.WriteLine("value = uint1: {0,17}", value.Equals(uint1));
      TestObjectForEquality(uint1);

      decimal dec1 = 112m;
      Console.WriteLine("value = dec1: {0,20}", value.Equals(dec1));
      TestObjectForEquality(dec1);

      double dbl1 = 112;
      Console.WriteLine("value = dbl1: {0,19}", 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 (Int64) = 112 (Byte): False
//
//       value = short1:            True
//       112 (Int64) = 112 (Int16): False
//
//       value = int1:              True
//       112 (Int64) = 112 (Int32): False
//
//       value = sbyte1:            True
//       112 (Int64) = 112 (SByte): False
//
//       value = ushort1:            True
//       112 (Int64) = 112 (UInt16): False
//
//       value = uint1:              True
//       112 (Int64) = 112 (UInt32): False
//
//       value = dec1:                False
//       112 (Int64) = 112 (Decimal): False
//
//       value = dbl1:               False
//       112 (Int64) = 112 (Double): False
Module Example
   Dim value As Int64 = 112
   
   Public Sub Main()
      Dim byte1 As Byte = 112
      Console.WriteLine("value = byte1: {0,15}", value.Equals(byte1))
      TestObjectForEquality(byte1)
      
      Dim short1 As Short = 112
      Console.WriteLine("value = short1: {0,15}", value.Equals(short1))
      TestObjectForEquality(short1)

      Dim int1 As Integer = 112
      Console.WriteLine("value = int1: {0,17}", value.Equals(int1))
      TestObjectForEquality(int1)

      Dim sbyte1 As SByte = 112
      Console.WriteLine("value = sbyte1: {0,15}", value.Equals(sbyte1))
      TestObjectForEquality(sbyte1)
      
      Dim ushort1 As UShort = 112
      Console.WriteLine("value = ushort1: {0,15}", value.Equals(ushort1))
      TestObjectForEquality(ushort1)

      Dim uint1 As UInteger = 112
      Console.WriteLine("value = uint1: {0,17}", value.Equals(uint1))
      TestObjectForEquality(uint1)

      Dim dec1 As Decimal = 112d
      Console.WriteLine("value = dec1: {0,20}", value.Equals(dec1))
      TestObjectForEquality(dec1)

      Dim dbl1 As Double = 112
      Console.WriteLine("value = dbl1: {0,19}", 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 (Int64) = 112 (Byte): False
'
'       value = short1:            True
'       112 (Int64) = 112 (Int16): False
'
'       value = int1:              True
'       112 (Int64) = 112 (Int32): False
'
'       value = sbyte1:            True
'       112 (Int64) = 112 (SByte): False
'
'       value = ushort1:            True
'       112 (Int64) = 112 (UInt16): False
'
'       value = uint1:              True
'       112 (Int64) = 112 (UInt32): False
'
'       value = dec1:                False
'       112 (Int64) = 112 (Decimal): False
'
'       value = dbl1:               False
'       112 (Int64) = 112 (Double): False

Equals(Object) Equals(Object) Equals(Object) Equals(Object)

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);
override this.Equals : obj -> bool
Public Overrides Function Equals (obj As Object) As Boolean

Parameters

obj
Object Object Object Object

An object to compare with this instance.

Returns

true if obj is an instance of an Int64 and equals the value of this instance; otherwise, false.

Examples

The following code example illustrates the use of Equals in the context of Int64, comparing two long values and returning true if they represent the same number, or false if they do not.

Int64 myVariable1 = 80;
Int64 myVariable2 = 80;

// Get and display the declaring type.
Console::WriteLine( "\nType of 'myVariable1' is ' {0}' and  value is : {1}", myVariable1.GetType(), myVariable1 );
Console::WriteLine( "Type of 'myVariable2' is ' {0}' and  value is : {1}", myVariable2.GetType(), myVariable2 );

// Compare 'myVariable1' instance with 'myVariable2' Object.
if ( myVariable1.Equals( myVariable2 ) )
      Console::WriteLine( "\nStructures 'myVariable1' and 'myVariable2' are equal" );
else
      Console::WriteLine( "\nStructures 'myVariable1' and 'myVariable2' are not equal" );

   Int64 myVariable1 = 80;
   Int64 myVariable2 = 80;

   // Get and display the declaring type.
   Console.WriteLine("\nType of 'myVariable1' is '{0}' and"+
        " value is :{1}",myVariable1.GetType(), myVariable1); 
   Console.WriteLine("Type of 'myVariable2' is '{0}' and"+
        " value is :{1}",myVariable2.GetType(), myVariable2);

   // Compare 'myVariable1' instance with 'myVariable2' Object.
   if( myVariable1.Equals( myVariable2 ) )
      Console.WriteLine( "\nStructures 'myVariable1' and "+
            "'myVariable2' are equal");
   else
      Console.WriteLine( "\nStructures 'myVariable1' and "+
            "'myVariable2' are not equal");
   
Dim myVariable1 As Int64 = 80
Dim myVariable2 As Int64 = 80

' Get and display the declaring type.
Console.WriteLine(ControlChars.NewLine + "Type of 'myVariable1' is '{0}' and" +  _
            " value is :{1}", myVariable1.GetType().ToString(), myVariable1.ToString())
Console.WriteLine("Type of 'myVariable2' is '{0}' and" +  _
         " value is :{1}", myVariable2.GetType().ToString(), myVariable2.ToString())

' Compare 'myVariable1' instance with 'myVariable2' Object.
If myVariable1.Equals(myVariable2) Then
   Console.WriteLine(ControlChars.NewLine + "Structures 'myVariable1' and " + _
            "'myVariable2' are equal")
Else
   Console.WriteLine(ControlChars.NewLine + "Structures 'myVariable1' and " +  _
         "'myVariable2' are not equal")
End If

Notes to Callers

Compiler overload resolution may account for an apparent difference in the behavior of the two Equals(Int64) method overloads. If an implicit conversion between the obj argument and an Int64 is defined and the argument is not typed as an Object, compilers perform an implicit conversion and call the Equals(Int64) method. Otherwise, they call the Equals(Object) method, which always returns false if its obj argument is not an Int64 value. The following example illustrates the difference in behavior between the two method overloads. In the case of the Byte, SByte, Int16, UInt16, Int32, and UInt32 values, the first comparison returns true because the compiler automatically performs a widening conversion and calls the Equals(Int64) method, whereas the second comparison returns false because the compiler calls the Equals(Object) method.

using System;

public class Example
{
   static long value = 112;
   
   public static void Main()
   {
      byte byte1= 112;
      Console.WriteLine("value = byte1: {0,15}", value.Equals(byte1));
      TestObjectForEquality(byte1);

      short short1 = 112;
      Console.WriteLine("value = short1: {0,15}", value.Equals(short1));
      TestObjectForEquality(short1);

      int int1 = 112;
      Console.WriteLine("value = int1: {0,17}", value.Equals(int1));
      TestObjectForEquality(int1);

      sbyte sbyte1 = 112;
      Console.WriteLine("value = sbyte1: {0,15}", value.Equals(sbyte1));
      TestObjectForEquality(sbyte1);

      ushort ushort1 = 112;
      Console.WriteLine("value = ushort1: {0,15}", value.Equals(ushort1));
      TestObjectForEquality(ushort1);

      uint uint1 = 112;
      Console.WriteLine("value = uint1: {0,17}", value.Equals(uint1));
      TestObjectForEquality(uint1);

      decimal dec1 = 112m;
      Console.WriteLine("value = dec1: {0,20}", value.Equals(dec1));
      TestObjectForEquality(dec1);

      double dbl1 = 112;
      Console.WriteLine("value = dbl1: {0,19}", 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 (Int64) = 112 (Byte): False
//
//       value = short1:            True
//       112 (Int64) = 112 (Int16): False
//
//       value = int1:              True
//       112 (Int64) = 112 (Int32): False
//
//       value = sbyte1:            True
//       112 (Int64) = 112 (SByte): False
//
//       value = ushort1:            True
//       112 (Int64) = 112 (UInt16): False
//
//       value = uint1:              True
//       112 (Int64) = 112 (UInt32): False
//
//       value = dec1:                False
//       112 (Int64) = 112 (Decimal): False
//
//       value = dbl1:               False
//       112 (Int64) = 112 (Double): False
Module Example
   Dim value As Int64 = 112
   
   Public Sub Main()
      Dim byte1 As Byte = 112
      Console.WriteLine("value = byte1: {0,15}", value.Equals(byte1))
      TestObjectForEquality(byte1)
      
      Dim short1 As Short = 112
      Console.WriteLine("value = short1: {0,15}", value.Equals(short1))
      TestObjectForEquality(short1)

      Dim int1 As Integer = 112
      Console.WriteLine("value = int1: {0,17}", value.Equals(int1))
      TestObjectForEquality(int1)

      Dim sbyte1 As SByte = 112
      Console.WriteLine("value = sbyte1: {0,15}", value.Equals(sbyte1))
      TestObjectForEquality(sbyte1)
      
      Dim ushort1 As UShort = 112
      Console.WriteLine("value = ushort1: {0,15}", value.Equals(ushort1))
      TestObjectForEquality(ushort1)

      Dim uint1 As UInteger = 112
      Console.WriteLine("value = uint1: {0,17}", value.Equals(uint1))
      TestObjectForEquality(uint1)

      Dim dec1 As Decimal = 112d
      Console.WriteLine("value = dec1: {0,20}", value.Equals(dec1))
      TestObjectForEquality(dec1)

      Dim dbl1 As Double = 112
      Console.WriteLine("value = dbl1: {0,19}", 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 (Int64) = 112 (Byte): False
'
'       value = short1:            True
'       112 (Int64) = 112 (Int16): False
'
'       value = int1:              True
'       112 (Int64) = 112 (Int32): False
'
'       value = sbyte1:            True
'       112 (Int64) = 112 (SByte): False
'
'       value = ushort1:            True
'       112 (Int64) = 112 (UInt16): False
'
'       value = uint1:              True
'       112 (Int64) = 112 (UInt32): False
'
'       value = dec1:                False
'       112 (Int64) = 112 (Decimal): False
'
'       value = dbl1:               False
'       112 (Int64) = 112 (Double): False
See also

Applies to