dr = skin.Tables["skin"].NewRow();
                    dr[0] = "系统默认";
                    skin.Tables[0].Rows.Add(dr);
                    skin.WriteXml("skin.xml", XmlWriteMode.IgnoreSchema);
                }
                foreach (SkinType st in (SkinType)System.Enum.GetValues(typeof(SkinType)))
                {
                    toolMenu.DropDownItems.Add(new ToolStripMenuItem(st.ToString()));//添加到菜单
                    //MessageBox.Show(st.ToString());
                  
                    toolMenu.DropDownItems[toolMenu.DropDownItems.Count - 1].Click += new EventHandler(frm_Main_Click);
                    if (st.ToString() == skin.Tables[0].Rows[0][0].ToString())//调用skin.xml中的参数skin.Tables[0].Rows[0][0].ToString()
                    {

                        ((ToolStripMenuItem)toolMenu.DropDownItems[toolMenu.DropDownItems.Count - 1]).Checked = true;
                        frm_Main_Click(toolMenu.DropDownItems[toolMenu.DropDownItems.Count - 1], null);

                    }

                }
           
                toolMenu.DropDownItems.Add(new ToolStripMenuItem("系统默认"));
                toolMenu.DropDownItems[toolMenu.DropDownItems.Count - 1].Click += new EventHandler(frm_Main_Click);