private object GetDataSourceValue(
DataGridViewComboBoxExColumn oc, ComboBoxEx di, object key)
{
if (key != null &&
string.IsNullOrEmpty(di.ValueMember) == false &&
string.IsNullOrEmpty(di.DisplayMember) == false)
{
CurrencyManager cm = GetCurrencyManager(oc, di);
if (cm != null)
{
string t = key.ToString();
for (int i = 0; i < cm.List.Count; i++)
{
if (cm.List[i] is DataRowView)
{
DataRowView drView = (DataRowView) cm.List[i];
string s = drView[di.DisplayMember].ToString();
if (t.Equals(s) == true)
return (drView[di.ValueMember]);
}
else if (cm.List[i] is string)
{
if (t.Equals(cm.List[i]) == true)
return (key);
}
else
{
object o = cm.List[i];
object value = o.GetType().GetProperty(di.DisplayMember).GetValue(o, null);
if (value is string)
{
if (t.Equals(value) == true)
{
value = o.GetType().GetProperty(di.ValueMember).GetValue(o, null);
return (value);
}
}
}
}
}
}
return (key);
}
private CurrencyManager GetCurrencyManager(
DataGridViewComboBoxExColumn oc, ComboBoxEx di)
{
if (oc.CurrencyManager == null)
{
if (DataGridView != null && DataGridView.BindingContext != null &&
di.DataSource != null && di.DataSource != Convert.DBNull)
{
oc.CurrencyManager = (CurrencyManager) DataGridView.BindingContext[di.DataSource];
}
}
return (oc.CurrencyManager);
}
/// <summary>
/// DrawControl
/// </summary>
/// <param name="di"></param>
/// <param name="r"></param>
/// <param name="bm"></param>
/// <param name="g"></param>
/// <param name="oc"></param>
/// <param name="s"></param>
private void DrawControl(ComboBoxEx di, Rectangle r,
Bitmap bm, Graphics g, DataGridViewComboBoxExColumn oc, string s)
{
Rectangle t = di.GetThumbRect(new Rectangle(0, 0, r.Width, r.Height));
if (t.IsEmpty == false)
{
// Work around Windows XP and Windows DropDownList
// DrawToBitmap problems
if (MustRenderVisibleControl(di.DropDownStyle) == true)
{
di.Location = oc.DataGridView.Location;
if (di.Parent == null)
{
Form form = oc.DataGridView.FindForm();
if (form != null)
di.Parent = form;
}
di.SendToBack();
di.Visible = true;
}
using (Bitmap bm2 = new Bitmap(bm))
{
di.Bounds = r;
di.DrawToBitmap(bm2, r);
t.X += r.X;
t.Y += r.Y;
g.DrawImage(bm2, t, t, GraphicsUnit.Pixel);
if (t.Left < r.Right)
r.Width -= (r.Right - t.Left - 3);
}
di.Visible = false;
}
DrawText(di, r, g, s);
}
