# Decimal.ToUInt64(Decimal) 方法

## 定义

``````public:
static System::UInt64 ToUInt64(System::Decimal d);``````
``````[System.CLSCompliant(false)]
public static ulong ToUInt64 (decimal d);``````
``````[<System.CLSCompliant(false)>]
static member ToUInt64 : decimal -> uint64``````
``Public Shared Function ToUInt64 (d As Decimal) As ULong``

d
Decimal

#### 返回

UInt64

`d` 的值等效的 64 位无符号整数。

#### 例外

`d` 为负值或大于 UInt64.MaxValue

## 示例

``````using System;

class Example
{
public static void Main( )
{
decimal[] values = { 123m, new Decimal(123000, 0, 0, false, 3),
123.999m, 18446744073709551615.999m,
18446744073709551616m, 9223372036854775807.999m,
9223372036854775808m, -0.999m, -1m,
-9223372036854775808.999m,
-9223372036854775809m };

foreach (var value in values) {
try {
ulong number = Decimal.ToUInt64(value);
Console.WriteLine("{0} --> {1}", value, number);
}
catch (OverflowException e)
{
Console.WriteLine("{0}: {1}", e.GetType().Name, value);
}
}
}
}
// The example displays the following output:
//     123 --> 123
//     123.000 --> 123
//     123.999 --> 123
//     18446744073709551615.999 --> 18446744073709551615
//     OverflowException: 18446744073709551616
//     9223372036854775807.999 --> 9223372036854775807
//     9223372036854775808 --> 9223372036854775808
//     -0.999 --> 0
//     OverflowException: -1
//     OverflowException: -9223372036854775808.999
//     OverflowException: -9223372036854775809
``````
``````open System

let values =
[ 123m; Decimal(123000, 0, 0, false, 3uy)
123.999m; 18446744073709551615.999m
18446744073709551616m; 9223372036854775807.999m
9223372036854775808m; -0.999m; -1m
-9223372036854775808.999m
-9223372036854775809m ]

for value in values do
try
let number = Decimal.ToUInt64 value
printfn \$"{value} --> {number}"
with :? OverflowException as e ->
printfn \$"{e.GetType().Name}: {value}"

// The example displays the following output:
//     123 --> 123
//     123.000 --> 123
//     123.999 --> 123
//     18446744073709551615.999 --> 18446744073709551615
//     OverflowException: 18446744073709551616
//     9223372036854775807.999 --> 9223372036854775807
//     9223372036854775808 --> 9223372036854775808
//     -0.999 --> 0
//     OverflowException: -1
//     OverflowException: -9223372036854775808.999
//     OverflowException: -9223372036854775809
``````
``````Module Example
Public Sub Main()
Dim values() As Decimal = { 123d, New Decimal(123000, 0, 0, false, 3),
123.999d, 18446744073709551615.999d,
18446744073709551616d, 9223372036854775807.999d,
9223372036854775808d, -0.999d, -1d,
-9223372036854775808.999d,
-9223372036854775809d }

For Each value In values
Try
Dim number As ULong = Decimal.ToUInt64(value)
Console.WriteLine("{0} --> {1}", value, number)
Catch e As OverflowException
Console.WriteLine("{0}: {1}", e.GetType().Name, value)
End Try
Next
End Sub
End Module
' The example displays the following output:
'     123 --> 123
'     123.000 --> 123
'     123.999 --> 123
'     18446744073709551615.999 --> 18446744073709551615
'     OverflowException: 18446744073709551616
'     9223372036854775807.999 --> 9223372036854775807
'     9223372036854775808 --> 9223372036854775808
'     -0.999 --> 0
'     OverflowException: -1
'     OverflowException: -9223372036854775808.999
'     OverflowException: -9223372036854775809
``````