Question

If this sounds too impossible, pls dont down vote 🙂 Just my quirk that I wonder if ever I can pass a property as the parameter to a function to get some result.

For eg.

void delete_button_click ()
{
    foreach (DataGridViewRow row in dgvRecords.SelectedRows)
        dgvRecords.Rows.Remove(row);
}

And suppose

void delete_all_button click ()
{
    foreach (DataGridViewRow row in dgvRecords.Rows)
        dgvRecords.Rows.Remove(row);
}

Can I write the above two codes in one function since the only difference is SelectedRows and Rows. Something like this:

void button_click (/*DataGridView property rows*/)
{
    foreach (DataGridViewRow row in dgvRecords.rows)
        dgvRecords.Rows.Remove(row);
}

And call it

{
   button_click(DataGridView.Rows);
   //and
   button_click(DataGridView.SelectedRows);
}

Another eg.,

decimal GetAmount1(User usr)
{
    decimal sum = 0;
    foreach (DataGridViewRow row in dgvRecords.Rows)
    {
        Tuple<User, User, Notification, Acknowledgment> tup = (Tuple<User, User, Notification, Acknowledgment>)row.Tag;
        if (tup.Item1 == usr)
            sum += tup.Item4.Sum;

    }
    return sum;
}

and

decimal GetAmount2(User usr)
{
    decimal sum = 0;
    foreach (DataGridViewRow row in dgvRecords.Rows)
    {
        Tuple<User, User, Notification, Acknowledgment> tup = (Tuple<User, User, Notification, Acknowledgment>)row.Tag;
        if (tup.Item2 == usr)
            sum += tup.Item4.Sum;

    }
    return sum;
}

The only difference in above codes are just a property. So is this available:

decimal GetAmount(User usr, Tuple<User, User, Notification, Acknowledgment>.Property Item)
{
    decimal sum = 0;
    foreach (DataGridViewRow row in dgvRecords.Rows)
    {
        Tuple<User, User, Notification, Acknowledgment> tup = (Tuple<User, User, Notification, Acknowledgment>)row.Tag;
        if (tup.Item == usr)
            sum += tup.Item4.Sum;

    }
    return sum;
}

And call :

{ 
     GetAmount(usr, Tuple<User, User, Notification, Acknowledgment>.Item1)
     //and
     GetAmount(usr, Tuple<User, User, Notification, Acknowledgment>.Item2)   
}

??

Answer 1

Your first example is can be solved by just using a normal parameter:

The signature of a method to remove rows would be:

void RemoveRows (IList rows)
{
    foreach (var row in rows)
        dgvRecords.Rows.Remove(row);
}

and call it with:

RemoveRows (DataGridView.Rows);
//or
RemoveRows (DataGridView.SelectedRows);

The second example requires the use of a Func<T, TResult> which allows you to define what property you want to select.

So your GetAmount() method siganture becomes:

decimal GetAmount(User usr, Func<Tuple<User, User, Notification, Acknowledgment>, User> selector)
{
    decimal sum = 0;
    foreach (DataGridViewRow row in dgvRecords.Rows)
    {
        Tuple<User, User, Notification, Acknowledgment> tup = (Tuple<User, User, Notification, Acknowledgment>)row.Tag;
        if (selector(tup) == usr)
            sum += tup.Item4.Sum;

    }
    return sum;
}

and you would call it:

GetAmount(usr, tuple => tuple.Item1);
//or
GetAmount(usr,  tuple => tuple.Item1);