Was this page helpful?
Your feedback about this content is important. Let us know what you think.
Additional feedback?
1500 characters remaining
Export (0) Print
Expand All

Decimal.Equals Method (Decimal)

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

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

public bool Equals(
	decimal value
)

Parameters

value
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.

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 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.

using System;

public class Example
{
   static decimal value = 112m;

   public static void Main()
   {
      byte byte1= 112;
      Console.WriteLine("value = byte1: {0,17}", 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);

      long long1 = 112;
      Console.WriteLine("value = long1: {0,18}", value.Equals(long1));
      TestObjectForEquality(long1);

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

      ushort ushort1 = 112;
      Console.WriteLine("value = ushort1: {0,17}", value.Equals(ushort1));
      TestObjectForEquality(ushort1);

      uint uint1 = 112;
      Console.WriteLine("value = uint1: {0,19}", value.Equals(uint1));
      TestObjectForEquality(uint1);

      ulong ulong1 = 112;
      Console.WriteLine("value = ulong1: {0,18}", value.Equals(ulong1));
      TestObjectForEquality(ulong1);

      float sng1 = 112;
      Console.WriteLine("value = sng1: {0,21}", value.Equals(sng1));
      TestObjectForEquality(sng1);

      double dbl1 = 112;
      Console.WriteLine("value = dbl1: {0,21}", 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 (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:                 False 
//       112 (Double) = 112 (Decimal): False 
// 
//       value = sng1:                True 
//       112 (Double) = 112 (Single): False

.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

.NET for Windows Phone apps

Supported in: Windows Phone 8.1, Windows Phone Silverlight 8.1, Windows Phone Silverlight 8

Portable Class Library

Supported in: Portable Class Library
Show:
© 2015 Microsoft