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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)

public bool Equals(
	ulong obj
)

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<T>.Equals(T)

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 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

The following example demonstrates the Equals method.

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

.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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