vb.net MissingPrimaryKeyException 即使 PK 已设置

Question

我正在尝试在 table SPOT 中查找主键 1 的行号。pk 已在 table 设计中设置（旁边有一个键名为 ID 的列），但出现 MissingPrimaryKeyException 错误。我是否需要添加更多代码行来说明哪一列是 pk？

     Public Class Form1
    Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click

        Dim table As DataTable = New DataTable("SPOT")
        Dim foundRow As DataRow = table.Rows.Find("1")

    End Sub
End Class

Answer 1

你需要这样的东西：

Private Sub SetPrimaryKeys()
   ' Create a new DataTable and set two DataColumn objects as primary keys.
   Dim table As DataTable = new DataTable()
   Dim keys(2) As DataColumn
   Dim column  As DataColumn

   ' Create column 1.
   column = New DataColumn()
   column.DataType = System.Type.GetType("System.String")
   column.ColumnName= "FirstName"

   ' Add the column to the DataTable.Columns collection.
   table.Columns.Add(column)
   ' Add the column to the array.
   keys(0) = column

   ' Create column 2 and add it to the array.
   column = New DataColumn()
   column.DataType = System.Type.GetType("System.String")
   column.ColumnName = "LastName"
   table.Columns.Add(column)

   ' Add the column to the array.
   keys(1) = column

   ' Set the PrimaryKeys property to the array.
   table.PrimaryKey = keys
End Sub`enter code here`

来自MSDN

vb.net MissingPrimaryKeyException 即使 PK 已设置

vb.net MissingPrimaryKeyException even though PK is set

vb.net

rows

primary-key