CODEWITHSUNDEEP
c#.netwinformsdatagridview
Mahdi Tahsildari
Mahdi Tahsildari

Reputation: 13602

How to disable the ability to select in a DataGridView?

I want to use my DataGridView only to show things, and I want the user not to be able to select any row, field or anything from the DataGridView.

How can I do this?

Upvotes: 72

Views: 168553

Answers (12)

edhubbell
edhubbell

Reputation: 2258

I'd go with this:

private void myDataGridView_SelectionChanged(Object sender, EventArgs e)
{
     myDataGridView.ClearSelection();  
}

I don't agree with the broad assertion that no DataGridView should be unselectable. Some UIs are built for tools or touchsreens, and allowing a selection misleads the user to think that selecting will actually get them somewhere.

Setting ReadOnly = true on the control has no impact on whether a cell or row can be selected. And there are visual and functional downsides to setting Enabled = false.

Another option is to set the control selected colors to be exactly what the non-selected colors are, but if you happen to be manipulating the back color of the cell, then this method yields some nasty results as well.

Upvotes: 150

IV.
IV.

Reputation: 9471

Here's what has always worked for me to disable the default selection in a class inherited from DataGridView:

// REQUIRES: SelectionMode = DataGridViewSelectionMode.FullRowSelect
protected override void SetSelectedRowCore(int rowIndex, bool selected)
{       
    base.SetSelectedRowCore(rowIndex, selected && ALLOW_DEFAULT_SELECTION);
}
bool ALLOW_DEFAULT_SELECTION = false;

Usually the goal is to disable it entirely (in order to implement our own custom selection and drawing process). When the goal is to allow the default selection only at specific times the boolean can be wrapped like so:

public void SelectRowExplicitly(int index, bool selected = true)
{
    try
    {
        ALLOW_DEFAULT_SELECTION = true;
        Rows[index].Selected = selected;
    }
    finally
    {
        ALLOW_DEFAULT_SELECTION = false;
    }
}

Upvotes: 1

Werner
Werner

Reputation: 135

Its in VB, but shouldnt be difficult to translate to C#: If you want to lock datagridview, use dg.ReadOnly == True;

If you want to prevent user from selecting another row, just remember old selection and based on condition set or not set the row which shall be selected. Assuming, that multiselection is turned off:

    Private Sub dg_SelectionChanged(sender As Object, e As EventArgs) Handles dg.SelectionChanged
    Static OldSelection As Integer
      If dg.Rows.Count > 0 Then
          If dg.SelectedRows(0).Index <> OldSelection And YOURCONDITION Then
            dg.Rows(OldSelection).Selected = True
          End If

        OldSelection = dg.SelectedRows(0).Index
      End If
    End Sub

Upvotes: 0

PWCoder
PWCoder

Reputation: 113

If you don't need to use the information in the selected cell then clearing selection works but if you need to still use the information in the selected cell you can do this to make it appear there is no selection and the back color will still be visible.

private void dataGridView_SelectionChanged(object sender, EventArgs e)
    {
        foreach (DataGridViewRow row in dataGridView.SelectedRows)
        {
            dataGridView.RowsDefaultCellStyle.SelectionBackColor = row.DefaultCellStyle.BackColor;
        }
    }

Upvotes: 3

Jannik Svensson
Jannik Svensson

Reputation: 31

you have to create a custom DataGridView

`

namespace System.Windows.Forms
{
    class MyDataGridView : DataGridView
    {
        public bool PreventUserClick = false;

        public MyDataGridView()
        {

        }
        protected override void OnMouseDown(MouseEventArgs e)
        {
            if (PreventUserClick) return;

            base.OnMouseDown(e);
        }
    }
}

` note that you have to first compile the program once with the added class, before you can use the new control.

then go to The .Designer.cs and change the old DataGridView to the new one without having to mess up you previous code.

private System.Windows.Forms.DataGridView dgv; // found close to the bottom

…

private void InitializeComponent() {
    ...
    this.dgv = new System.Windows.Forms.DataGridView();
    ...
}

to (respective)

private System.Windows.Forms.MyDataGridView dgv;

this.dgv = new System.Windows.Forms.MyDataGridView();

Upvotes: 2

Bengineer
Bengineer

Reputation: 21

I liked user4101525's answer best in theory but it doesn't actually work. Selection is not an overlay so you see whatever is under the control

Ramgy Borja's answer doesn't deal with the fact that default style is not actually a color at all so applying it doesn't help. This handles the default style and works if applying your own colors (which may be what edhubbell refers to as nasty results)

dgv.RowsDefaultCellStyle.SelectionBackColor = dgv.RowsDefaultCellStyle.BackColor.IsEmpty ? System.Drawing.Color.White : dgv.RowsDefaultCellStyle.BackColor;
dgv.RowsDefaultCellStyle.SelectionForeColor = dgv.RowsDefaultCellStyle.ForeColor.IsEmpty ? System.Drawing.Color.Black : dgv.RowsDefaultCellStyle.ForeColor;

Upvotes: 0

Ramgy Borja
Ramgy Borja

Reputation: 2458

Enabled property to false

or

this.dataGridView1.DefaultCellStyle.SelectionBackColor = this.dataGridView1.DefaultCellStyle.BackColor;
this.dataGridView1.DefaultCellStyle.SelectionForeColor = this.dataGridView1.DefaultCellStyle.ForeColor;

Upvotes: 15

Paddy
Paddy

Reputation: 21

This worked for me like a charm:

row.DataGridView.Enabled = false;

row.DefaultCellStyle.BackColor = Color.LightGray;

row.DefaultCellStyle.ForeColor = Color.DarkGray;

(where row = DataGridView.NewRow(appropriate overloads);)

Upvotes: 2

user4101525
user4101525

Reputation: 211

You may set a transparent background color for the selected cells as following:

DataGridView.RowsDefaultCellStyle.SelectionBackColor = System.Drawing.Color.Transparent;

Upvotes: 21

SharpC
SharpC

Reputation: 7474

I found setting all AllowUser... properties to false, ReadOnly to true, RowHeadersVisible to false, ScollBars to None, then faking the prevention of selection worked best for me. Not setting Enabled to false still allows the user to copy the data from the grid.

The following code also cleans up the look when you want a simple display grid (assuming rows are the same height):

int width = 0;
for (int i = 0; i < dataGridView1.Columns.Count; i++)
{
    width += dataGridView1.Columns[i].Width;
}

dataGridView1.Width = width;
dataGridView1.Height = dataGridView1.Rows[0].Height*(dataGridView1.Rows.Count+1);

Upvotes: 1

Rick
Rick

Reputation: 49

I fixed this by setting the Enabled property to false.

Upvotes: 4

Angshuman Agarwal
Angshuman Agarwal

Reputation: 4866

Use the DataGridView.ReadOnly property

The code in the MSDN example illustrates the use of this property in a DataGridView control intended primarily for display. In this example, the visual appearance of the control is customized in several ways and the control is configured for limited interactivity.

Observe these settings in the sample code:

// Set property values appropriate for read-only
// display and limited interactivity
dataGridView1.AllowUserToAddRows = false;
dataGridView1.AllowUserToDeleteRows = false;
dataGridView1.AllowUserToOrderColumns = true;
dataGridView1.ReadOnly = true;
dataGridView1.SelectionMode = DataGridViewSelectionMode.FullRowSelect;
dataGridView1.MultiSelect = false;
dataGridView1.AutoSizeRowsMode = DataGridViewAutoSizeRowsMode.None;
dataGridView1.AllowUserToResizeColumns = false;
dataGridView1.ColumnHeadersHeightSizeMode = 
DataGridViewColumnHeadersHeightSizeMode.DisableResizing;
dataGridView1.AllowUserToResizeRows = false;
dataGridView1.RowHeadersWidthSizeMode = 
DataGridViewRowHeadersWidthSizeMode.DisableResizing;

Upvotes: -3

Related Questions