将工具提示添加到数据网格视图上的特定列

Question

I have a Data Grid View like:

if (this.dgv.Rows.Count < 1)
                {
                    this.dgv.DataSource = null;
                    this.dgv.DataBindings.Clear();
                    if (this.dgv.Columns.Count == 0) this.dgv.ColumnCount = 15;
                    this.dgv.ColumnHeadersVisible = true;

                    this.dgv.Columns[4].Name = "Added By";
                    this.dgv.Columns[5].Name = "AddedByFullName";
                }

as you can see I have column 4 called Added By

 this.dgv.Columns[4].Name = "Added By";

and column 5 called AddedByFullName

 this.dgv.Columns[5].Name = "AddedByFullName";

I want to know how can I use AddedByFullName column as a tooltip for Added By column then I will just remove AddedByFullName column , is that possible? Regards

Answer 1

You can do this using the CellMouseEnter or CellToolTipTextNeeded event for the DataGridView . Hide the column you want to use as the source, then replace the control name in the sample to match your DataGridView .

private void dgv_CellMouseEnter(object sender, DataGridViewCellEventArgs e)
{
    if ((e.ColumnIndex == dgv.Columns["Added By"].Index)
        && (e.RowIndex > -1))
    {
        dgv.Rows[e.RowIndex].Cells[e.ColumnIndex].ToolTipText = dgv.Rows[e.RowIndex].Cells[dgv.Columns["AddedByFullName"].Index].Value.ToString();
    }
}

Answer 2

Using CellMouseEnter event can be a posibility to achieve this but it also can be done with CellFormatting event as Microsoft REFERENCE

  private void dgJobNotes_CellFormatting(object sender, DataGridViewCellFormattingEventArgs e)
        {
            if ((e.ColumnIndex == this.dgJobNotes.Columns["Added By"].Index)
            && e.Value != null)
            {
   dgJobNotes.Rows[e.RowIndex].Cells[e.ColumnIndex].ToolTipText = dgJobNotes.Rows[e.RowIndex].Cells[5].Value.ToString();
            }

Answer 3

The DataGridViewColumn class has a ToolTipText property. If you set it on the column, you will get a tool tip for the column header. If you want a tool tip to show up on every cell, you can implement a CellFormatting event handler, pull out the right cell (from the column) and set the cell's ToolTipText property. Something like:

 private const int InterestingColumnNumber = 5;
 private const string InterestingColumnToolTipText = "This Space For Rent";

 private void dataGridView1_CellFormatting(object sender, DataGridViewCellFormattingEventArgs e)
 {
     var senderGridView = sender as DataGridView;
     if (senderGridView != null)
     {
         if (e.ColumnIndex == InterestingColumnNumber) 
         {
             var cell = senderGridView.Rows[e.RowIndex].Cells[InterestingColumnNumber];
             cell.ToolTipText = InterestingColumnToolTipText;
         }
     }
 }

Answer 4

There is a CellToolTipTextNeeded event which is created specifically for setting tooltip text. You don't need to use use CellFormatting or CellMouseEnter . If you are going to show text of column 5 as tooltip of column 4, you can write:

private void g_CellToolTipTextNeeded(object sender, DataGridViewCellToolTipTextNeededEventArgs e)
{
    if (e.ColumnIndex == 4 && e.RowIndex >= 0)
    {
        e.ToolTipText = $"{dataGridView1[5, e.RowIndex].Value}";
    }
}