DateTime.Equality(DateTime, DateTime) 運算子
重要
部分資訊涉及發行前產品，在發行之前可能會有大幅修改。 Microsoft 對此處提供的資訊，不做任何明確或隱含的瑕疵擔保。
判斷 DateTime 的兩個指定執行個體是否相等。
public:
static bool operator ==(DateTime d1, DateTime d2);C#
public static bool operator == (DateTime d1, DateTime d2);static member ( = ) : DateTime * DateTime -> boolPublic Shared Operator == (d1 As DateTime, d2 As DateTime) As Boolean- d1
- DateTime
要比較的第一個物件。
- d2
- DateTime
要比較的第二個物件。
當 true 和 d1 代表相同的日期和時間時為 d2，否則為 false。
下列範例示範等號比較運算子。
System::DateTime april19( 2001, 4, 19 );
System::DateTime otherDate( 1991, 6, 5 );
// areEqual gets false.
bool areEqual = april19 == otherDate;
otherDate = DateTime( 2001, 4, 19 );
// areEqual gets true.
areEqual = april19 == otherDate;
C#
System.DateTime april19 = new DateTime(2001, 4, 19);
System.DateTime otherDate = new DateTime(1991, 6, 5);
// areEqual gets false.
bool areEqual = april19 == otherDate;
otherDate = new DateTime(2001, 4, 19);
// areEqual gets true.
areEqual = april19 == otherDate;
Dim april19 As New DateTime(2001, 4, 19)
Dim otherDate As New DateTime(1991, 6, 5)
Dim areEqual As Boolean
' areEqual gets false.
areEqual = DateTime.op_Equality(april19, otherDate)
otherDate = New DateTime(2001, 4, 19)
' areEqual gets true.
areEqual = System.DateTime.op_Equality(april19, otherDate)
Equality運算子 DateTime 會藉由比較它們的刻度數目來判斷兩個值是否相等。 在比較 DateTime 物件之前，請確定物件代表相同時區的時間。 只要比較其 Kind 屬性的值，即可做到這一點。
這個運算子的對等方法是 DateTime.Equals(Object)
| 產品 | 版本 |
|---|---|
| .NET | Core 1.0, Core 1.1, Core 2.0, Core 2.1, Core 2.2, Core 3.0, Core 3.1, 5, 6, 7 |
| .NET Framework | 1.1, 2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8 |
| .NET Standard | 1.0, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 2.0, 2.1 |
| UWP | 10.0 |