UniqueConstraint.Equals(Object) 方法

定义

命名空间:

System.Data

程序集:

System.Data.Common.dll

Source:

UniqueConstraint.cs

将此约束与第二个约束比较以确定两个约束是否相同。

public:
 override bool Equals(System::Object ^ key2);

public override bool Equals (object? key2);

override this.Equals : obj -> bool

Public Overrides Function Equals (key2 As Object) As Boolean

参数

key2

Object

此 UniqueConstraint 将与之比较的对象。

返回

Boolean

如果约束相同，则为 true；否则为 false。

示例

以下示例比较两个 UniqueConstraint 对象。

Private Sub CompareConstraints()
    Dim constraintCustomerOrders As UniqueConstraint
    Dim constraintOrderDetails As UniqueConstraint
    Dim relationCustomerOrders As DataRelation
    Dim relationOrderDetails As DataRelation

    ' Get a DataRelation from a DataSet.
    relationCustomerOrders = DataSet1.Relations("CustomerOrders")

    '  Get a constraint.
    constraintCustomerOrders = relationCustomerOrders.ParentKeyConstraint

    ' Get a second relation and constraint.
    relationOrderDetails = DataSet1.Relations("OrderDetails")
    constraintOrderDetails = relationOrderDetails.ParentKeyConstraint

    ' Compare the two.
    Console.WriteLine( _
        constraintCustomerOrders.Equals(constraintOrderDetails).ToString())
 End Sub

注解

如果两个约束约束相同的列，则它们相等。

另请参阅

• ParentKeyConstraint
• 向表添加约束