UInt64.MaxValue Field

public: System::UInt64 MaxValue = 18446744073709551615;

public const ulong MaxValue = 18446744073709551615;

val mutable MaxValue : uint64

Public Const MaxValue As ULong = 18446744073709551615

Field Value

Examples

The following example uses the MinValue and MaxValue fields to verify that a Double value is within the range of the UInt64 type before it performs a type conversion. This prevents an OverflowException at run time.

double decimalValue = -1.5;
ulong integerValue; 

// Discard fractional portion of Double value
double decimalInteger = Math.Floor(decimalValue);

if (decimalInteger <= ulong.MaxValue && 
 decimalInteger >= ulong.MinValue)
{ 
 integerValue = (ulong) decimalValue;
 Console.WriteLine("Converted {0} to {1}.", decimalValue, integerValue);
} 
else
{
 ulong rangeLimit;
 string relationship;
 
 if (decimalInteger > ulong.MaxValue)
 {
 rangeLimit = ulong.MaxValue;
 relationship = "greater";
 } 
 else
 {
 rangeLimit = ulong.MinValue;
 relationship = "less";
 } 

 Console.WriteLine("Conversion failure: {0} is {1} than {2}.", 
 decimalInteger, 
 relationship, 
 rangeLimit);
}

open System

let decimalValue = -1.5

// Discard fractional portion of Double value
let decimalInteger = floor decimalValue

if decimalInteger <= float UInt64.MaxValue && decimalInteger >= float UInt64.MinValue then
 let integerValue = uint64 decimalValue
 printfn $"Converted {decimalValue} to {integerValue}."
else
 let rangeLimit, relationship =
 if decimalInteger > float UInt64.MaxValue then
 UInt64.MaxValue, "greater"
 else
 UInt64.MinValue, "less"

 printfn $"Conversion failure: {decimalInteger} is {relationship} than {rangeLimit}."

Dim decimalValue As Double = -1.5
Dim integerValue As ULong 

' Discard fractional portion of Double value
Dim decimalInteger As Double = Math.Floor(decimalValue)

If decimalInteger <= ULong.MaxValue AndAlso _
 decimalInteger >= ULong.MinValue Then
 integerValue = CULng(decimalValue)
 Console.WriteLine("Converted {0} to {1}.", decimalValue, integerValue)
Else
 Dim rangeLimit As ULong
 Dim relationship As String
 
 If decimalInteger > ULong.MaxValue Then
 rangeLimit = ULong.MaxValue
 relationship = "greater"
 Else
 rangeLimit = ULong.MinValue
 relationship = "less"
 End If 

 Console.WriteLine("Conversion failure: {0} is {1} than {2}", _ 
 decimalInteger, _
 relationship, _
 rangeLimit)
End If

Remarks

The value of this constant is 18,446,744,073,709,551,615; that is, hexadecimal 0xFFFFFFFFFFFFFFFF.

See also

• MinValue