UniqueConstraint.IsPrimaryKey Property
Definition
Important
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Gets a value indicating whether or not the constraint is on a primary key.
public:
property bool IsPrimaryKey { bool get(); };public bool IsPrimaryKey { get; }[System.Data.DataSysDescription("KeyConstraintIsPrimaryKeyDescr")]
public bool IsPrimaryKey { get; }member this.IsPrimaryKey : bool[<System.Data.DataSysDescription("KeyConstraintIsPrimaryKeyDescr")>]
member this.IsPrimaryKey : boolPublic ReadOnly Property IsPrimaryKey As BooleanProperty Value
true, if the constraint is on a primary key; otherwise, false.
- Attributes
Examples
The following example checks the IsPrimaryKey property.
Private Sub GetPrimaryKey()
Dim dataRelation As DataRelation
Dim uniqueConstraint As UniqueConstraint
' Get a DataRelation from a DataSet.
dataRelation = DataSet1.Relations("CustomerOrders")
' Get the ParentKeyConstraint.
uniqueConstraint = dataRelation.ParentKeyConstraint
' Test if the IsPrimaryKey is true.
If uniqueConstraint.IsPrimaryKey Then
Console.WriteLine("IsPrimaryKey=True")
Else
Console.WriteLine("IsPrimaryKey=False")
End If
End Sub
Remarks
A table usually includes a primary key that ensures every row is unique. In some tables, the primary key may be made up of more than one column. For example, a primary key for a table containing names might be made up of both the first and last names as well. To create a primary key with more than one column, set the Columns property to an array of DataColumn objects.
