Question

C# -- Disable edit/delete on existing ?

Asked by: finance_teacher

How can I setup the attached so users can
"Add New Items" but not edit/delete existing ?
-----------------------------------------------
Steps I did:
 1. click on "gML_COMPONENTSDataGridView"
 2. Properties
      ** AllowUserToDeleteRows = False
 3. go into "EditModeChanged" EVENT
 4. add something to below ?
        private void gML_COMPONENTSDataGridView_EditModeChanged(object sender, EventArgs e)
        {
            if (new, then allow save)
        }

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Asked On
2009-11-05 at 12:25:10ID24875946
Tags

C# -- Disable edit/delete on existing ?

Topics

Microsoft Visual C#.Net

,

.NET

,

C# Programming Language

Participating Experts
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Points
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Answers

 

by: mas_oz2003Posted on 2009-11-05 at 12:40:01ID: 25753758

YOu need the following properties in your datagridview set to:
AllowUserToAddRows =true;
AllowUserToDeleteRows = false;
ReadOnly=true;

You do not need the event as you are not editing the existing cells.

 

by: finance_teacherPosted on 2009-11-05 at 12:44:58ID: 25753807

I already had
  AllowUserToAddRows =true;
  AllowUserToDeleteRows = false;

Adding
  ReadOnly=true;
allows user to click "+" so it looks like they can add a row, however it still remains ReadOnly so users cannot add a row (attached)

I am using dotNet 2.0

How can I get this to work ?

 

by: x77Posted on 2009-11-05 at 12:56:53ID: 25753920

In this sample I use RowEnter event.
You can use a For Each and set all rows readonly when you load data.
The Trick is set ReadOnly Row Based.

    Private Sub Dgv_RowEnter(ByVal sender As Object, ByVal e As System.Windows.Forms.DataGridViewCellEventArgs) Handles Dgv.RowEnter
       Dim r = Dgv.Rows(e.RowIndex)
       If r.IsNewRow = False Then r.ReadOnly = True
    End Sub
                                              
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by: finance_teacherPosted on 2009-11-05 at 13:16:18ID: 25754136

Below gives errors
What is the correct C# syntax ?
----------------------------------------------------------------------------------------------------
        private void gML_COMPONENTSDataGridView_RowEnter(object sender, DataGridViewCellEventArgs e)
        {
            var vGridRow = gML_COMPONENTSDataGridView.Rows(e.RowIndex);
            if (vGridRow.IsNewRow == false)
            {
                  vGridRow.ReadOnly = true;;
            }
        }

 

by: x77Posted on 2009-11-05 at 13:36:48ID: 25754312

You are using Vs.2005
I Use Implicit, (Vs.2008).

I send the two methods,
First - Row Enter.
   User add a row, then other, Can not modify the first Row.
Second ForEach
  User can modify all rows added.

private void Dgv_RowEnter(object sender, DataGridViewCellEventArgs e)
{
    DataGridViewRow r = this.Dgv.Rows[e.RowIndex];
    if (!r.IsNewRow)
    {
        r.ReadOnly = true;
    }
}
 
 
 
foreach(r as DataGridViewRow in Dgv.Rows)
   if (!r.IsNewRow) r.ReadOnly = true;
   
                                              
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Select allOpen in new window

 

by: finance_teacherPosted on 2009-11-05 at 13:58:00ID: 25754508

Changed DataGridView
 ** AllowUserToAddRows = true;
 ** AllowUserToDeleteRows = false;
 ** ReadOnly = true;
---------------------------------------------------
Added below
** fails, makes everything readonly,
   even when doing "+" sign

        private void gML_COMPONENTSDataGridView_RowEnter(object sender, DataGridViewCellEventArgs e)
        {
            DataGridViewRow r = this.gML_COMPONENTSDataGridView.Rows[e.RowIndex];
            if (r.IsNewRow)
            {
                  r.ReadOnly = false;
            }
        }
---------------------------------------------------
How can I fix ?

 

by: x77Posted on 2009-11-05 at 14:04:22ID: 25754556

No, If you declare  ReadOnly = true at DataGridView level, can not edit data on new row.

 

by: x77Posted on 2009-11-05 at 14:10:24ID: 25754607

Also, you Write if (r.IsNewRow), Attention to ! sign, is negation in c#

if (!r.IsNewRow)

 

by: finance_teacherPosted on 2009-11-05 at 14:10:41ID: 25754610

Doing below works, thanks.
-----------------------------------------
 ** AllowUserToAddRows = true;
 ** AllowUserToDeleteRows = false;
 ** ReadOnly = false;

        private void gML_COMPONENTSDataGridView_RowEnter_1(object sender, DataGridViewCellEventArgs e)
        {
            DataGridViewRow r = this.gML_COMPONENTSDataGridView.Rows[e.RowIndex];
            if (!r.IsNewRow)
            {
                r.ReadOnly = true;
            }
        }

 

by: x77Posted on 2009-11-05 at 14:13:04ID: 25754635

Sorry, You think that is possible set ReaOnly to a row when Dgv is ReadOnly.

20120131-EE-VQP-002

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