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DateTime.Compare(DateTime, DateTime) 方法

定義

比較 DateTime 的兩個執行個體,並傳回整數,這個整數表示第一個執行個體早於、同於或晚於第二個執行個體。

public:
 static int Compare(DateTime t1, DateTime t2);
public static int Compare (DateTime t1, DateTime t2);
static member Compare : DateTime * DateTime -> int
Public Shared Function Compare (t1 As DateTime, t2 As DateTime) As Integer

參數

t1
DateTime

要比較的第一個物件。

t2
DateTime

要比較的第二個物件。

傳回

帶正負號的數字,該數字表示 t1t2 的相對值。

實值類型 條件
小於零 t1 早於 t2
t1t2 相同。
大於零 t1 晚於 t2

範例

下列範例示範 Compare 方法。

DateTime date1 = new DateTime(2009, 8, 1, 0, 0, 0);
DateTime date2 = new DateTime(2009, 8, 1, 12, 0, 0);
int result = DateTime.Compare(date1, date2);
string relationship;

if (result < 0)
   relationship = "is earlier than";
else if (result == 0)
   relationship = "is the same time as";
else
   relationship = "is later than";

Console.WriteLine("{0} {1} {2}", date1, relationship, date2);

// The example displays the following output for en-us culture:
//    8/1/2009 12:00:00 AM is earlier than 8/1/2009 12:00:00 PM
let date1 = DateTime(2009, 8, 1, 0, 0, 0)
let date2 = DateTime(2009, 8, 1, 12, 0, 0)
let result = DateTime.Compare(date1, date2)

let relationship =
    if result < 0 then
        "is earlier than"
    elif result = 0 then
        "is the same time as"
    else
        "is later than"

printfn $"{date1} {relationship} {date2}"

// The example displays the following output for en-us culture:
//    8/1/2009 12:00:00 AM is earlier than 8/1/2009 12:00:00 PM
Module Example
   Public Sub Main()
      Dim date1 As Date = #08/01/2009 12:00AM#
      Dim date2 As Date = #08/01/2009 12:00PM#
      Dim result As Integer = DateTime.Compare(date1, date2)
      Dim relationship As String
      
      If result < 0 Then
         relationship = "is earlier than"
      ElseIf result = 0 Then
         relationship = "is the same time as"         
      Else
         relationship = "is later than"
      End If
      
      Console.WriteLine("{0} {1} {2}", date1, relationship, date2)
   End Sub
End Module
' The example displays the following output:
'    8/1/2009 12:00:00 AM is earlier than 8/1/2009 12:00:00 PM

備註

若要判斷 與 的 t1t2 關聯性, Compare 方法會 Ticks 比較 和 t2t1 屬性,但會忽略其 Kind 屬性。 比較 DateTime 物件之前,請確定物件代表相同時區中的時間。

適用於

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