本文整理汇总了VB.NET中System.Data.DataTableReader.Item属性的典型用法代码示例。如果您正苦于以下问题：VB.NET DataTableReader.Item属性的具体用法？VB.NET DataTableReader.Item怎么用？VB.NET DataTableReader.Item使用的例子？那么, 这里精选的属性代码示例或许可以为您提供帮助。
在下文中一共展示了DataTableReader.Item属性的2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: 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