Databases
StackOverflow2013
Postsdbo
POUnexpected result in deleting DataGridView Columns
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POUnexpected result in deleting DataGridView Columns
    primarykey
    data
    text
    <pre><code> DataTable dt = new DataTable(); dt.Columns.Add("col1"); dt.Columns.Add("col2"); dt.Columns.Add("col3"); dt.Columns.Add("col4"); dt.Columns.Add("col5"); dataGridView1.DataSource = dt; dataGridView1.Columns.RemoveAt(3); dataGridView1.Columns.RemoveAt(2); dataGridView1.Columns.RemoveAt(0); </code></pre> <p>In this program, I created a DataTable with 5 columns. This will be the DataSource of the DataGridView. Some columns in the DataTable doesn't need to be seen by the user, but will be used by the program later on.</p> <p>After the last line, the columns are arranged as : col2, col5, col1, col3, col4. Why does it appear like this? Shouldn't it be removed from the DataGridView? What should I do to make it appear as "col2, col5"?</p> <p>EDIT: I want to <em>remove</em> some Columns from the DataGridView, yet still be available in the DataTable. Also, it works inside an event (like Button_Click)</p> <p>EDIT: I <strong>still</strong> haven't figured out why this is happening. I have no choice but to create another thread (BackgroundWorker) to do this...</p> <pre><code> private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e) { DataTable dt = new DataTable(); int i; dataGridView1.Invoke((MethodInvoker)delegate { dt.Columns.Add("col1"); dt.Columns.Add("col2"); dt.Columns.Add("col3"); dt.Columns.Add("col4"); dt.Columns.Add("col5"); dataGridView1.DataSource = dt; dataGridView1.Columns.RemoveAt(3); dataGridView1.Columns.RemoveAt(2); dataGridView1.Columns.RemoveAt(0); }); } </code></pre> <p>As far as I can tell, Haris Hasan was right; that the Form containing the DataGridView should appear at least once. But I'm still confused why...</p>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USGerald Torres
    1. USGerald Torres
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    2. PO
      singulars
      1. PTAnswer
    3. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. POUnexpected result in deleting DataGridView Columns
      1. This table or related slice is empty.
      1. VTApproveEditSuggestion
    1. This table or related slice is empty.
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload