初始化combox

            comboBox1.DropDownStyle = ComboBoxStyle.DropDownList;comboBox1.ItemHeight = 25;     // 设置 combox 的行高comboBox1.DrawMode = DrawMode.OwnerDrawVariable;

添加 DrawItem 事件

        private void comboBox1_DrawItem(object sender, DrawItemEventArgs e){if (e.Index < 0)return;e.DrawBackground();e.DrawFocusRectangle();// 调整文字文字位置， 主要调整 Y   （e.Bounds.Y）e.Graphics.DrawString(comboBox1.Items[e.Index].ToString(), e.Font, new SolidBrush(e.ForeColor), e.Bounds.X, e.Bounds.Y + 5);}

效果