DateTime.MaxValue 欄位

定義

命名空間:
System
組件:
mscorlib.dll, System.Runtime.dll
組件:
mscorlib.dll
組件:
System.Runtime.dll
組件:
netstandard.dll

代表 的最大 DateTime可能值。 此欄位僅供讀取。

public: static initonly DateTime MaxValue;
public static readonly DateTime MaxValue;
 staticval mutable MaxValue : DateTime
Public Shared ReadOnly MaxValue As DateTime

欄位值

DateTime

範例

以下範例透過傳遞一個代表若干tick的建構子Int64值來實例化一個DateTime物件。 在呼叫建構子之前，範例會確保此值大於或等 DateTime.MinValue.Ticks 於 ，且小於或等於 DateTime.MaxValue.Ticks。 如果沒有，則會拋出一個 ArgumentOutOfRangeException。

// Attempt to assign an out-of-range value to a DateTime constructor.
long numberOfTicks = Int64.MaxValue;
DateTime validDate;

// Validate the value.
if (numberOfTicks >= DateTime.MinValue.Ticks &&
    numberOfTicks <= DateTime.MaxValue.Ticks)
   validDate = new DateTime(numberOfTicks);
else if (numberOfTicks < DateTime.MinValue.Ticks)
   Console.WriteLine("{0:N0} is less than {1:N0} ticks.",
                     numberOfTicks,
                     DateTime.MinValue.Ticks);
else
   Console.WriteLine("{0:N0} is greater than {1:N0} ticks.",
                     numberOfTicks,
                     DateTime.MaxValue.Ticks);
// The example displays the following output:
//   9,223,372,036,854,775,807 is greater than 3,155,378,975,999,999,999 ticks.

// Attempt to assign an out-of-range value to a DateTime constructor.
let numberOfTicks = Int64.MaxValue

// Validate the value.
if numberOfTicks >= DateTime.MinValue.Ticks &&
   numberOfTicks <= DateTime.MaxValue.Ticks then
    let validDate = DateTime numberOfTicks
    ()
elif numberOfTicks < DateTime.MinValue.Ticks then
    printfn $"{numberOfTicks:N0} is less than {DateTime.MinValue.Ticks:N0} ticks."
else
    printfn $"{numberOfTicks:N0} is greater than {DateTime.MaxValue.Ticks:N0} ticks."
// The example displays the following output:
//   9,223,372,036,854,775,807 is greater than 3,155,378,975,999,999,999 ticks.

' Attempt to assign an out-of-range value to a DateTime constructor.
Dim numberOfTicks As Long = Int64.MaxValue
Dim validDate As Date

' Validate the value.
If numberOfTicks >= Date.MinValue.Ticks And _
   numberOfTicks <= Date.MaxValue.Ticks Then
   validDate = New Date(numberOfTicks)
ElseIf numberOfTicks < Date.MinValue.Ticks Then
   Console.WriteLine("{0:N0} is less than {1:N0} ticks.", 
                     numberOfTicks, 
                     DateTime.MinValue.Ticks)      
Else                                                   
   Console.WriteLine("{0:N0} is greater than {1:N0} ticks.", 
                     numberOfTicks, 
                     DateTime.MaxValue.Ticks)     
End If
' The example displays the following output:
'   9,223,372,036,854,775,807 is greater than 3,155,378,975,999,999,999 ticks.

備註

此常數的值相當於格里曆 9999 年 12 月 31 日 23：59：59.99999999 UTC，正好是 10000 年 1 月 1 日 00：00：00 UTC 前一個 100 奈秒的刻度。

有些曆法，如 ThaiBuddhistCalendar，支持一個比 MaxValue早於 的上日期範圍。 在這些情況下，嘗試存取 MaxValue 變數指派或格式化與解析操作時，可能會拋出一個 ArgumentOutOfRangeException。 你可以從該屬性取得指定文化最新有效日期值Calendar.MaxSupportedDateTime，而不必取得 的值DateTime.MaxValue。

適用於

另請參閱