C# WinForm (笨方法)根据不同的样式配置 设置窗体相关控件的背景 以改变窗体风格

//1. 项目下增加相关图片文件夹
------------------------------
--项目WinFormStudy
  --窗体LoginForm.cs
  --窗体MainForm.cs
  --文件夹StyleImage
     --子文件夹StyleA
        --相关图片btnAddUser.JPG及其他   
          (将图片做为 嵌入的资源 进行生成)
     --子文件夹StyleB
        --相关图片btnAddUser.JPG及其他  

//2.  App.config中保存当前窗体的风格
------------------------------------
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <appSettings>
    <add key="CurrentStyle" value="StyleB"/>
  </appSettings>
  ...
</configuration>

//3.  窗体调用
----------------
DrawStylePicture.DrawButtonBackgroundImage(this.btnAddUser, "btnAddUser.JPG");

//4.  DrawStylePicture
-----------------------

using System;
using System.Collections.Generic;
using System.Text;
using System.Windows.Forms;
using System.Reflection;
using System.Drawing;
using System.IO;

namespace WinFormStudy
{
    class DrawStylePicture
    {
        public static void DrawFormBackgroundImage(Object obj, string strPicName)
        {
            Form frm = (Form)obj;
            string strStyleName = AppConfigXMLManage.GetAppConfig("CurrentStyle");
            Assembly assem = Assembly.GetExecutingAssembly();
            System.IO.Stream stream = assem.GetManifestResourceStream("WinFormStudy.StyleImage." + strStyleName + "." + strPicName);
            Image image = Bitmap.FromStream(stream);
            frm.BackgroundImage = image;
            frm.BackgroundImageLayout = ImageLayout.Stretch;
        }

        public static void DrawPanelBackgroundImage(Object obj, string strPicName)
        {
            Panel pnl = (Panel)obj;
            string strStyleName = AppConfigXMLManage.GetAppConfig("CurrentStyle");
            Assembly assem = Assembly.GetExecutingAssembly();
            System.IO.Stream stream = assem.GetManifestResourceStream("WinFormStudy.StyleImage." + strStyleName + "." + strPicName);
            Image image = Bitmap.FromStream(stream);
            pnl.BackgroundImage = image;
            pnl.BackgroundImageLayout = ImageLayout.Stretch;
        }

        public static void DrawButtonBackgroundImage(Object obj, string strPicName)
        {
            Button btn = (Button)obj;
            string strStyleName = AppConfigXMLManage.GetAppConfig("CurrentStyle");
            Assembly assem = Assembly.GetExecutingAssembly();
            System.IO.Stream stream = assem.GetManifestResourceStream("WinFormStudy.StyleImage." + strStyleName + "." + strPicName);
            Image image = Bitmap.FromStream(stream);
            btn.BackgroundImage = image;
            btn.BackgroundImageLayout = ImageLayout.Stretch;
        }
    }
}

//5.  AppConfigXMLManage
-------------------------

using System;
using System.Collections.Generic;
using System.Text;
using System.Xml;
using System.Windows.Forms;

namespace WinFormStudy
{
    class AppConfigXMLManage
    {
        public static string GetAppConfig(string strKey)
        {
            //return System.Configuration.ConfigurationManager.AppSettings[strKey];
            XmlDocument doc = new XmlDocument();
            try
            {
                doc.Load(Application.ExecutablePath + ".config");
                XmlNode node = doc.SelectSingleNode(@"//add[@key='" + strKey + "']");
                XmlElement ele = (XmlElement)node;
                return ele.GetAttribute("value");
            }
            catch
            {
                return string.Empty;
            }
        }

        public static bool UpdateAppConfig(string strKey, string strValue)
        {
            XmlDocument doc = new XmlDocument();
            try
            {
                doc.Load(Application.ExecutablePath + ".config");
                XmlNode node = doc.SelectSingleNode(@"//add[@key='" + strKey + "']");
                XmlElement ele = (XmlElement)node;
                ele.SetAttribute("value", strValue);
                doc.Save(Application.ExecutablePath + ".config");
            }
            catch
            {
                return false;
            }
            return true;
        }
    }
}