更改组合框的项目高度

Question

如何设置组合框项的高度？我的 combobox.size=new size(320,40) 和我设置了 combobox.itemheight=18 但它没有用。我希望我的 itemheight 或文本高度为 18，并且组合框的固定大小为 320x40。我也使用了 drawmode 属性，但什么也没发生。

Answer 1

尝试更改组合框的字体大小

Answer 2

好吧，为了防止组合框调整到默认高度，你可以声明它是手动绘制的：

myComboBox.DrawMode = DrawMode.OwnerDrawFixed; // or DrawMode.OwnerDrawVariable;
myComboBox.Height = 18; // <- what ever you want

那你要实现DrawItem事件：

private void myComboBox_DrawItem(object sender, DrawItemEventArgs e) {
  ComboBox box = sender as ComboBox;

  if (Object.ReferenceEquals(null, box))
    return;

  e.DrawBackground();

  if (e.Index >= 0) {
    Graphics g = e.Graphics;

    using (Brush brush = ((e.State & DrawItemState.Selected) == DrawItemState.Selected)
                          ? new SolidBrush(SystemColors.Highlight)
                          : new SolidBrush(e.BackColor)) {
      using (Brush textBrush = new SolidBrush(e.ForeColor)) { 
        g.FillRectangle(brush, e.Bounds);

        g.DrawString(box.Items[e.Index].ToString(), 
                     e.Font,
                     textBrush, 
                     e.Bounds, 
                     StringFormat.GenericDefault);
      }
    }
  }

  e.DrawFocusRectangle();
}

编辑：使组合框拉伸，但不它的下拉列表

   myComboBox.DrawMode = DrawMode.OwnerDrawVariable; 
   myComboBox.Height = 18; // Combobox itself is 18 pixels in height

   ...

   private void myComboBox_MeasureItem(object sender, MeasureItemEventArgs e) {
     e.ItemHeight = 17; // while item is 17 pixels high only
   }