本文整理汇总了VB.NET中System.Data.DataRow.IsNull方法的典型用法代码示例。如果您正苦于以下问题：VB.NET DataRow.IsNull方法的具体用法？VB.NET DataRow.IsNull怎么用？VB.NET DataRow.IsNull使用的例子？那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类System.Data.DataRow的用法示例。
在下文中一共展示了DataRow.IsNull方法的3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: PrintRows
Private Sub PrintRows(dataSet As DataSet)
Dim table As DataTable
Dim column As DataColumn
Dim row As DataRow
For Each table In dataSet.Tables
For Each row In table.Rows
For Each column In table.Columns
If Not row.IsNull(column) Then
Console.WriteLine(row(column).ToString())
End If
Next column
Next row
Next table
End Sub示例2: IsValNull
Private Sub IsValNull()
' Assuming the DataGrid is bound to a DataTable.
Dim table As DataTable = CType(DataGrid1.DataSource, DataTable)
Dim row As DataRow = table.Rows(datagrid1.CurrentCell.RowNumber)
row.BeginEdit
row(1) = System.DBNull.Value
row.EndEdit
row.AcceptChanges
Console.WriteLine(row.IsNull(1))
End Sub示例3: IsValNull
Private Sub IsValNull()
' Assuming the DataGrid is bound to a DataTable.
Dim table As DataTable = CType(DataGrid1.DataSource, DataTable)
Dim row As DataRow = table.Rows(datagrid1.CurrentCell.RowNumber)
row.BeginEdit
row("FirstName") = System.DBNull.Value
row.EndEdit
row.AcceptChanges
Console.WriteLine(row.IsNull("FirstName"))
End Sub