本文整理匯總了VB.NET中System.Data.DataColumn.Expression屬性的典型用法代碼示例。如果您正苦於以下問題：VB.NET DataColumn.Expression屬性的具體用法？VB.NET DataColumn.Expression怎麽用？VB.NET DataColumn.Expression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.DataColumn的用法示例。
在下文中一共展示了DataColumn.Expression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: CalcColumns
Private Sub CalcColumns()
Dim rate As Single = .0862
Dim table As New DataTable()
' Create the first column.
Dim priceColumn As New DataColumn()
With priceColumn
.DataType = System.Type.GetType("System.Decimal")
.ColumnName = "price"
.DefaultValue = 50
End With
' Create the second, calculated, column.
Dim taxColumn As New DataColumn()
With taxColumn
.DataType = System.Type.GetType("System.Decimal")
.ColumnName = "tax"
.Expression = "price * 0.0862"
End With
' Create third column
Dim totalColumn As New DataColumn()
With totalColumn
.DataType = System.Type.GetType("System.Decimal")
.ColumnName = "total"
.Expression = "price + tax"
End With
' Add columns to DataTable
With table.Columns
.Add(priceColumn)
.Add(taxColumn)
.Add(totalColumn)
End With
Dim row As DataRow= table.NewRow
table.Rows.Add(row)
Dim view As New DataView
view.Table = table
DataGrid1.DataSource = view
End Sub