当用户更改单元格值时捕获的 DataGridView 事件

Question

I have a Winforms app written in C#.

In one of my DataGridViews I have set all columns except one called 'Reference' to ReadOnly = true;

I want the application to know when a User has changed anything in the 'Reference' column, but all the events I have tried so far fire a lot more than when a user has made changes. For example CurrentCellChanged fires when the DataGridView is initially rendered and everytime the user simply clicks or tabs along the rows etc.

I'm only interested in catching user changes to data in the 'Reference' column which is the ONLY column where ReadOnly = false;

Which is the best event to use for this?

Answer 1

CellValueChanged is what you need:

private void dataGridView1_CellValueChanged(object sender, DataGridViewCellEventArgs e){
  if(dataGridView1.Columns[e.ColumnIndex].Name == "Reference"){
    //your code goes here
  }
}

I think the event CellEndEdit is also suitable for your want:

private void dataGridView1_CellEndEdit(object sender, DataGridViewCellEventArgs e){
  if(dataGridView1.Columns[e.ColumnIndex].Name == "Reference"){
    //your code goes here
  }
}

Answer 2

In my case CellValueChanged event was also triggering while the DGV was initializing, so I wanted to use CellEndEdit, as King King mentioned in his answer.

To make King King 's second answer more bullet-proof (see JPProgrammer 's comment), ie only react, if a value was entered in the cell, you can do the following:

   private void DataGridView1_CellEndEdit(object sender, DataGridViewCellEventArgs e)
   {
        int? rowIdx = e?.RowIndex;
        int? colIdx = e?.ColumnIndex;
        if (rowIdx.HasValue && colIdx.HasValue)
        {
            var dgv = (DataGridView)sender;
            var cell = dgv?.Rows?[rowIdx.Value]?.Cells?[colIdx.Value]?.Value;
            if (!string.IsNullOrEmpty(cell?.ToString()))
            {
                // your code goes here
            };
        };
   }

Notice the null handling by using ?. and ?[ operators. I have written it so that it can be used in a more general way, but of course you can add the check for the "Reference" column, just replace the inner if statement above by the following:

       if (dgv.Columns[colIdx.Value].Name == "Reference")
       {
          if (!string.IsNullOrEmpty(cell?.ToString()))
          {
               // your code goes here
          };
       };

Answer 3

DataGridView.CurrentCellDirtyStateChanged