将数据表行的行状态设置为已删除

Question

I have an UltraGrid in my project, and I have an update function on the form to update the data in the database where the data is matching.

The data in the grid is being stored as a DataTable . If a row of existing data is deleted from the UltraGrid , I want to be able to set the RowState of that row in the DataTable to 'RowState.Deleted , so that in the Update function I can check the RowState`, and if it's a deleted row, then deleted it, otherwise, update the data.

How can I go about doing this? So far, I have the code below, but the count of rows being returned is 1 (or, the current number of rows in the grid) and not 2 (the number there was before I deleted one row).

How and where in the code, do I set the RowState of the deleted row to be RowState.Deleted ? Is there an alternative way of doing it using the UltraGrid ?

dsProducts.Tables.Add(commDt.Copy) -- commDt is the DataTable linked to the UltraGrid
tr = con.BeginTransaction(

  For Each dr As DataRow In dsProducts.Tables(0).Rows
    If dr.RowState = DataRowState.Deleted Then
     Try

Answer 1

The grid will call mark the row as deleted (setting the RowState) and if you are using a TableAdapter then you can simply call Update on the table adapter passing the DataTable to the TableAdapter and it will do the updates in the database. For example:

ultraGrid1.UpdateData()
Me.dbRowsTableAdapter.Update(Me.testDataSet)

If you must manually handle updates and you want to get the deleted rows, you could call Select on the DataTable passing in DataViewRowState .Deleted for the third parameter.

Answer 2

Solved it.

• Declare a DataTable at the top of the class

• On the BeforeRowsUpdate method, insert a new row into the DataTable , which are the values of the row being deleted.

• Optionally, include a confirmation box to ensure they wish to delete the row. If they cancel the deletion, remove the row from the DataTable .

• This DataTable can then be used for deleting rows in the UPDATE query, whilst the grid DataSource can handle the UPSERTS