本文整理汇总了VB.NET中System.Data.DataTable.ColumnChanging事件的典型用法代码示例。如果您正苦于以下问题：VB.NET DataTable.ColumnChanging事件的具体用法？VB.NET DataTable.ColumnChanging怎么用？VB.NET DataTable.ColumnChanging使用的例子？那么恭喜您, 这里精选的事件代码示例或许可以为您提供帮助。您也可以进一步了解该事件所在类System.Data.DataTable的用法示例。
在下文中一共展示了DataTable.ColumnChanging事件的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的VB.NET代码示例。
示例1: DataTableColumnChanging
Private Shared Sub DataTableColumnChanging()
Dim custTable As New DataTable("Customers")
' add columns
custTable.Columns.Add("id", Type.GetType("System.Int32"))
custTable.Columns.Add("name", Type.GetType("System.String"))
custTable.Columns.Add("address", Type.GetType("System.String"))
' set PrimaryKey
custTable.Columns("id").Unique = true
custTable.PrimaryKey = New DataColumn() { custTable.Columns("id") }
' add a ColumnChanging event handler for the table.
AddHandler custTable.ColumnChanging, New _
DataColumnChangeEventHandler(AddressOf Column_Changing )
' add ten rows
Dim id As Integer
For id = 1 To 10
custTable.Rows.Add( _
New Object() { id, string.Format("customer{0}", id), _
string.Format("address{0}", id) })
Next
custTable.AcceptChanges()
' change the name column in all the rows
Dim row As DataRow
For Each row In custTable.Rows
row("name") = string.Format("vip{0}", row("id"))
Next
End Sub
Private Shared Sub Column_Changing(sender As Object, _
e As DataColumnChangeEventArgs)
Console.WriteLine( _
"Column_Changing Event: name={0}; Column={1}; proposed name={2}", _
e.Row("name"), e.Column.ColumnName, e.ProposedValue)
End Sub