UInt64.Equals Method (System) (original) (raw)
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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 -> boolPublic Overrides Function Equals (obj As Object) As BooleanParameters
obj
An object to compare to this instance.
Returns
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