DateTime.Compare(DateTime, DateTime) 方法
定义
重要
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比较两个实例 DateTime 并返回一个整数，该整数指示第一个实例是早于、与第二个实例相同还是晚于第二个实例。
public:
static int Compare(DateTime t1, DateTime t2);public static int Compare(DateTime t1, DateTime t2);static member Compare : DateTime * DateTime -> intPublic Shared Function Compare (t1 As DateTime, t2 As DateTime) As Integer参数
- t1
- DateTime
要比较的第一个对象。
- t2
- DateTime
要比较的第二个对象。
返回
一个有符号数字，指示其相对值 t1 和 t2。
| 值类型 | 条件 |
|---|---|
| 小于零 |
t1 早于 t2.
|
| 零 |
t1 与 t2.
|
| 大于零 |
t1 晚于 t2.
|
示例
以下示例演示了该方法 Compare 。
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
注解
若要确定其关系t1t2，该方法Compare比较Ticks其属性t1，t2但忽略其Kind属性。 在比较 DateTime 对象之前，请确保对象表示同一时区中的时间。
