Copy only selected rows without not-selected rows between in RowHeaderSelect mode

问题

I'm looking for a possibility in C# in Windows Forms Application to be able to:

Select multiple, full rows at a time.
Include unselected rows between the selected ones.
Then copy them to the clipboard without empty spaces (which are left for the unselected rows).

The DataGridViewSelectionMode.FullRowSelect doesn't cut it as I also need to be able to select independent cells. I need to enable the same behaviour in row copying as the DataGridViewSelectionMode.FullRowSelect has but for the DataGridViewSelectionMode.RowHeaderSelect mode. Would that be possible to do?

Thanks in advanced.

回答1:

First, to do this we will be manually removing the empty lines from the default copy results. We will call the following method to do so:

private void StripEmptyFromCopy()
{
    string[] separated = Clipboard.GetText().Split('\n').Where(s => !String.IsNullOrWhiteSpace(s)).ToArray();
    string copy = String.Join("\n", separated);

    if (!String.IsNullOrEmpty(copy))
    {
        Clipboard.SetText(copy);
    }
}

Solutions and Cons

My initial thought was to do this by handling the DataGridView.KeyUp event, checking the user input for Ctrl+C:

private void dataGridView1_KeyUp(object sender, KeyEventArgs e)
{
    if (e.KeyCode == Keys.C && (Control.Modifiers & Keys.Control) == Keys.Control)
    {
        StripEmptyFromCopy();
        e.Handled = true;
    }
}

Works fine if C is released first. If Ctrl is released first, the empty rows are still in the Clipboard.

Create your own class inherting from DataGridView and override ProcessCmdKey:

public class CopyDataGridView : DataGridView
{
    protected override bool ProcessCmdKey(ref Message msg, Keys keyData)
    {
        if (keyData == (Keys.Control | Keys.C))
        {
            StripEmptyFromCopy();
            return false;
        }

        return base.ProcessCmdKey(ref msg, keyData);
    }
}

Returning True after calling StripEmptyFromCopy prevents the Clipboard from getting the copy. Returning False works... but then gets overridden by the default copy and I don't know where this occurs.

Combine these ideas to catch Ctrl+C no matter which key is released first in the KeyUp event handler:

public class CopyDataGridView : DataGridView
{
    public bool Copying { get; set; }

    protected override bool ProcessCmdKey(ref Message msg, Keys keyData)
    {
        Copying = keyData == (Keys.Control | Keys.C);
        return base.ProcessCmdKey(ref msg, keyData);
    }
}

// And in the form:
copyDataGridView1.KeyUp += CopyDataGridView1_KeyUp;

private void CopyDataGridView1_KeyUp(object sender, KeyEventArgs e)
{
    if (copyDataGridView1.Copying)
    {
        StripEmptyFromCopy();
        copyDataGridView1.Copying = false;
        e.Handled = true;
    }
}

It's more work, but it gives consistent results vs. option 1.

来源：https://stackoverflow.com/questions/32863711/copy-only-selected-rows-without-not-selected-rows-between-in-rowheaderselect-mod

标签

datagridview

selection