UInt64.Equals Method
Definition
Important
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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
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
See also
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
Returns
true
if obj
has the same value as this instance; otherwise, false
.
Implements
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
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
.NET