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在DevExpress.XtraEditors.XtraForm中，窗体的样式和皮肤有UseDefaultLookAndFeel属性。设置为false，就可以直接再属性里面修改样式和皮肤了。如果设置为true，可以再里面放控件defaultLookAndFeel，设置 defaultLookAndFeel的样式和皮肤，XtraForm窗体的样式和皮肤就可以随着改变。

我试着定义一个XFrmBase窗体，再窗体上房一个控件：defaultLookAndFeel1，定义为Protected。然后其它窗体都从这个窗体上继承。发现再代码的任何一个地方，修改defaultLookAndFeel1的属性，所有窗体的样式和皮肤跟着改变。然后再把皮肤和样式保存在XML文件中，就实现了所谓的换肤功能。

具体步骤如下：

1. 定义一个XFrmBase窗体，在这个窗体上放defaultLookAndFeel1控件，修改为Protected。在XFrmBase.Designer.cs中，把

//this.defaultLookAndFeel1.LookAndFeel.SkinName = ...;
//this.defaultLookAndFeel1.LookAndFeel.Style = ...;

这两行注释掉，然后其它所有的窗体都从这个窗体继承。

2. 定义两个XML文件：

StyleXML.xml

<?xml version="1.0" encoding="utf-8"?>
<xml>
<Style>
<StyleValue value="">Flat</StyleValue>
<StyleValue value="">UltraFlat</StyleValue>
<StyleValue value="IsSelected">Style3D</StyleValue>
<StyleValue value="">Office2003</StyleValue>
<StyleValue value="">WinXp</StyleValue>
<StyleValue value="">Skin</StyleValue>
</Style>
</xml>

SkinXML.xml

<?xml version="1.0" encoding="utf-8"?>
<xml>
<Skin>
<SkinValue value="IsSelected">Caramel</SkinValue>
<SkinValue value="">Money Twins</SkinValue>
<SkinValue value="">Lilian</SkinValue>
<SkinValue value="">The Asphalt World</SkinValue>
<SkinValue value="">iMaginary</SkinValue>
<SkinValue value="">Black</SkinValue>
<SkinValue value="">Blue</SkinValue>
</Skin>
</xml>

3. 两个操作XML文件的类：

using System;
using System.Collections.Generic;
using System.Text;
using System.Xml;
using System.Data;
using System.IO;

namespace FlowerWin.Classes
{
public class XmlControl
{
protected string strXmlFile;
protected XmlDocument objXmlDoc = new XmlDocument();

public XmlControl(string xmlFile)
{
try
{
objXmlDoc.Load(xmlFile);
}
catch (System.Exception ex)
{
throw ex;
}
strXmlFile = xmlFile;
}

public DataView GetData(string xmlPathNode)
{
DataSet ds = new DataSet();
StringReader read = new StringReader(objXmlDoc.SelectSingleNode(xmlPathNode).OuterXml);
//string test = objXmlDoc.SelectSingleNode(xmlPathNode).OuterXml;
ds.ReadXml(read);
return ds.Tables[0].DefaultView;
}

public DataTable GetData(string xmlPathNode, string attrib)
{
DataTable dt = new DataTable();
dt.Columns.Add("NodeName", typeof(string));
dt.Columns.Add(attrib, typeof(string));

XmlNodeList xnList = objXmlDoc.SelectNodes(xmlPathNode);
foreach (XmlNode xn in xnList)
{
if (xn.Attributes[attrib] != null)
{
DataRow dr = dt.NewRow();
dr[0] = xn.InnerText;
dr[1] = xn.Attributes[attrib].Value;
dt.Rows.Add(dr);
}
}

return dt;
}

public void Replace(string xmlPathNode, string content)
{
objXmlDoc.SelectSingleNode(xmlPathNode).InnerText = content;
}

public void Delete(string node)
{
string mainNode = node.Substring(0, node.LastIndexOf("/"));
objXmlDoc.SelectSingleNode(mainNode).RemoveChild(objXmlDoc.SelectSingleNode(node));
}

public void InsertNode(string mainNode, string childNode, string element, string content)
{
XmlNode objRootNode = objXmlDoc.SelectSingleNode(mainNode);
XmlElement objChildNode = objXmlDoc.CreateElement(childNode);
objRootNode.AppendChild(objChildNode);
XmlElement objElement = objXmlDoc.CreateElement(element);
objElement.InnerText = content;
objChildNode.AppendChild(objElement);
}

public void InsertElement(string mainNode, string element, string attrib, string attribContent, string content)
{
XmlNode objNode = objXmlDoc.SelectSingleNode(mainNode);
XmlElement objElement = objXmlDoc.CreateElement(element);
objElement.SetAttribute(attrib, attribContent);
objElement.InnerText = content;
objNode.AppendChild(objElement);
}

public void InsertElement(string mainNode, string element, string content)
{
XmlNode objNode = objXmlDoc.SelectSingleNode(mainNode);
XmlElement objElement = objXmlDoc.CreateElement(element);
objElement.InnerText = content;
objNode.AppendChild(objElement);
}

public string[] GetNodeList(string xmlPathNode)
{
XmlNodeList xnList = objXmlDoc.SelectNodes(xmlPathNode);
string[] strArr = new string[xnList.Count];
for (int i = 0; i < xnList.Count; i++)
{
strArr[i] = xnList[i].InnerText;
}
return strArr;
}

public string GetNodeStr(string xmlPathNode, string attrib, string attribContent)
{
string xnStr = "";
XmlNodeList xnList = objXmlDoc.SelectNodes(xmlPathNode);
foreach (XmlNode xn in xnList)
{
if (xn.Attributes[attrib] != null)
{
if (xn.Attributes[attrib].Value == attribContent)
{
xnStr = xn.InnerText;
break;
}
}
}
return xnStr;
}

public void SaveNode(string xmlPathNode, string nodeName)
{
XmlNodeList xnList = objXmlDoc.SelectNodes(xmlPathNode);
foreach (XmlNode xn in xnList)
{
XmlElement xe = (XmlElement)xn;
if (xe.GetAttribute("value") == "IsSelected")
{
xe.SetAttribute("value", "");
}
if (xe.InnerText == nodeName)
{
xe.SetAttribute("value", "IsSelected");
}
}

Save();
}

public void Save()
{
try
{
objXmlDoc.Save(strXmlFile);
}
catch (System.Exception ex)
{
throw ex;
}
objXmlDoc = null;
}

}
}
///////////////////////////////////
using System;
using System.Collections.Generic;
using System.Text;
using System.Data;
using System.Windows.Forms;
using DevExpress.LookAndFeel;

namespace FlowerWin.Classes
{
public class StyleSkin
{
private static string xmlStyle = Common.GetXmlDirectory() + "StyleXml.xml";
private static string xmlSkin = Common.GetXmlDirectory() + "SkinXml.xml";

public static string GetSelectedStyle()
{
XmlControl xmlControl = new XmlControl(xmlStyle);
string styleName = xmlControl.GetNodeStr("xml/Style/StyleValue", "value", "IsSelected");
return styleName;
}

public static void GetLookFeelStyle(DevExpress.LookAndFeel.DefaultLookAndFeel dlf, string styleName)
{
string skinName = GetSelectedSkin();
switch (styleName)
{
case "Flat":
dlf.LookAndFeel.SetFlatStyle();
break;
case "UltraFlat":
dlf.LookAndFeel.SetUltraFlatStyle();
break;
case "Style3D":
dlf.LookAndFeel.SetStyle3D();
break;
case "Office2003":
dlf.LookAndFeel.SetOffice2003Style();
break;
case "WinXp":
dlf.LookAndFeel.SetWindowsXPStyle();
break;
case "Skin":
dlf.LookAndFeel.SetSkinStyle(skinName);
break;
default:
dlf.LookAndFeel.SetDefaultStyle();
break;
}
}

public static DevExpress.LookAndFeel.LookAndFeelStyle GetLookFeelStyle(string styleName)
{
DevExpress.LookAndFeel.LookAndFeelStyle lfStyle;
switch (styleName)
{
case "Flat":
lfStyle = LookAndFeelStyle.Flat;
break;
case "UltraFlat":
lfStyle = LookAndFeelStyle.UltraFlat;
break;
case "Style3D":
lfStyle = LookAndFeelStyle.Style3D;
break;
case "Office2003":
lfStyle = LookAndFeelStyle.Office2003;
break;
case "Skin":
lfStyle = LookAndFeelStyle.Skin;
break;
default:
lfStyle = LookAndFeelStyle.Office2003;
break;
}
return lfStyle;
}

public static string GetSelectedSkin()
{
XmlControl xmlControl = new XmlControl(xmlSkin);
string skinName = xmlControl.GetNodeStr("xml/Skin/SkinValue", "value", "IsSelected");
return skinName;
}

public static DataTable GetStytleList()
{
XmlControl xmlControl = new XmlControl(xmlStyle);
DataTable dt = xmlControl.GetData("xml/Style/StyleValue", "value");
return dt;
}

public static DataTable GetSkinList()
{
XmlControl xmlControl = new XmlControl(xmlSkin);
DataTable dt = xmlControl.GetData("xml/Skin/SkinValue", "value");
return dt;
}

public static void SaveSelectedStlye(string styleName)
{
XmlControl xmlControl = new XmlControl(xmlStyle);
xmlControl.SaveNode("xml/Style/StyleValue", styleName);
}

public static void SaveSelectedSkin(string skinName)
{
XmlControl xmlControl = new XmlControl(xmlSkin);
xmlControl.SaveNode("xml/Skin/SkinValue", skinName);
}
}
}
///////////////////////////////////

4. 在最先启动的窗体中设置defaultLookAndFeel1

string styleName = StyleSkin.GetSelectedStyle();
//defaultLookAndFeel1.LookAndFeel.Style = YarnNew.Classes.StyleSkin.GetLookFeelStyle(styleName);
defaultLookAndFeel1.LookAndFeel.SkinName = StyleSkin.GetSelectedSkin();

5.最后是定义一个窗体，设置和保存样式及皮肤。

具体代码略。