本文整理匯總了VB.NET中System.Data.DataTableReader.Item屬性的典型用法代碼示例。如果您正苦於以下問題：VB.NET DataTableReader.Item屬性的具體用法？VB.NET DataTableReader.Item怎麽用？VB.NET DataTableReader.Item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。
在下文中一共展示了DataTableReader.Item屬性的2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: DisplayItems
Private Sub DisplayItems(ByVal reader As DataTableReader)
Dim rowNumber As Integer
While reader.Read()
Console.WriteLine("Row " & rowNumber)
For i As Integer = 0 To reader.FieldCount - 1
Console.WriteLine("{0}: {1}", reader.GetName(i), reader.Item(i))
Next
rowNumber += 1
End While
End Sub示例2: GetValueByName
Private Function GetValueByName( _
ByVal reader As DataTableReader, _
ByVal columnName As String) As Object
' Consider when to use a procedure like this one carefully:
' If you're going to retrieve information from a column
' in a loop, it would be better to retrieve the column
' ordinal once, store the value, and use the methods
' of the DataTableReader class directly.
' Use Item(columnName) sparingly.
Dim columnValue As Object
Try
columnValue = reader.Item(columnName)
Catch ex As ArgumentException
' Throw all other errors back out to the caller.
columnValue = Nothing
End Try
Return columnValue
End Function