本文整理匯總了VB.NET中System.Data.DataSet.EnforceConstraints屬性的典型用法代碼示例。如果您正苦於以下問題：VB.NET DataSet.EnforceConstraints屬性的具體用法？VB.NET DataSet.EnforceConstraints怎麽用？VB.NET DataSet.EnforceConstraints使用的例子？那麽, 這裏精選的屬性代碼示例或許可以為您提供幫助。您也可以進一步了解該屬性所在類System.Data.DataSet的用法示例。
在下文中一共展示了DataSet.EnforceConstraints屬性的1個代碼示例，這些例子默認根據受歡迎程度排序。您可以為喜歡或者感覺有用的代碼點讚，您的評價將有助於係統推薦出更棒的VB.NET代碼示例。
示例1: DemonstrateEnforceConstraints
Private Sub DemonstrateEnforceConstraints()
' Create a DataSet with one table, one column and
' a UniqueConstraint.
Dim dataSet As New DataSet("dataSet")
Dim table As New DataTable("table")
Dim column As New DataColumn("col1")
column.Unique = True
table.Columns.Add(column)
dataSet.Tables.Add(table)
Console.WriteLine("constraints.count: " _
& table.Constraints.Count)
' add five rows.
Dim row As DataRow
Dim i As Integer
For i = 0 To 4
row = table.NewRow()
row("col1") = i
table.Rows.Add(row)
Next
table.AcceptChanges()
dataSet.EnforceConstraints = False
' Change the values of all rows to 1.
Dim thisRow As DataRow
For Each thisRow In table.rows
thisRow("col1") = 1
Next
Try
dataSet.EnforceConstraints = True
Catch e As System.Data.ConstraintException
' Process exception and return.
Console.WriteLine("Exception of type {0} occurred.", _
e.GetType().ToString())
End Try
End Sub