DateTime.Compare(DateTime, DateTime) 方法

定義

命名空間:

System

組件:

System.Runtime.dll

來源:

DateTime.cs

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

Int32

帶正負號的數字，該數字表示 t1 和 t2 的相對值。

實值類型	條件
小於零	t1 早於 t2。
零	t1 與 t2 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 t2 的 t1 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。

另請參閱

• CompareTo(Object)
• Equals(Object)