IConfigurationSectionHandler 接口的用法

<script type="text/javascript"> </script> <script src="http://pagead2.googlesyndication.com/pagead/show_ads.js" type="text/javascript"></script>

对asp.net 的配置文件即熟悉又陌生,熟悉的是天天在使用,陌生是实现原理还是个糊涂的概念.
今天终于花了点时间了解一下IConfigurationSectionHandler 接口的用法 ,引以入门.
首先建立一 RobsunConfigSectionHandler 专案,代码如下 :

 

namespace  RobsunConfigSectionHandler
... {
    public class RobsunParaSectionHandler:IConfigurationSectionHandler
    ...{
        IConfigurationSectionHandler 成員#region IConfigurationSectionHandler 成員

        public object Create(object parent, object configContext, XmlNode section)
        ...{
            RobsunPara para = new RobsunPara();

            foreach (XmlNode xn in section.ChildNodes)
            ...{
                switch (xn.Name)
                ...{
                    case "path":
                        para.Path = xn.SelectSingleNode("@value").InnerText;
                        break;
                    case "companyName":
                        para.CompanyName = xn.SelectSingleNode("@value").InnerText;
                        break;
                    case "isPrivate":
                        para.IsPrivate = bool.Parse(xn.SelectSingleNode("@attribute").InnerText);
                        break;
                }
            }

            return para;
        }

        #endregion
    }
}

 

 RobsunParaSectionHandler类实现 IConfigurationSectionHandler 接口.

RobsunPara类(实际就是参数类)的代码如下:

     public   class  RobsunPara
     ... {
        codecode#region code
        private string _path = "";
        private string _companyName = "";
        private bool _isPrivate = false;

        public string Path
        ...{
            get ...{ return _path; }
            set ...{ _path = value; }
        }

        public string CompanyName
        ...{
            get ...{ return _companyName; }
            set ...{ _companyName = value; }
        }

        public bool IsPrivate
        ...{
            get ...{ return _isPrivate; }
            set ...{ _isPrivate = value; }
        }
        #endregion
    }

ConfigurationHander类的创建工作已完成,次handler的工作必须配合如下配置文件的格式(其实的配置文件依赖handler).这里是web.config(三种配置文件任一,web.config,App.config,machine.config ,前两种会覆盖machine.config,当然这里是没法子在App.config配置了 ~Q~ )

< configuration >
  
     < configSections >
         < sectionGroup  name ="robsunGroup" >
             < section  name ="robsunSection"  type ="RobsunConfigSectionHandler.RobsunParaSectionHandler,RobsunConfigSectionHandler" />
         </ sectionGroup >
     </ configSections >
  
     < robsunGroup >
         < robsunSection >
             < path  value ="NONE" />
             < companyName  value ="Robsun" />
             < isPrivate  attribute ="true" />
         </ robsunSection >
     </ robsunGroup >
  
     < appSettings />
     < connectionStrings />
     < system .web >
    ...

准备代码都已完成.剩下的就是拿来用了....
这里为了简单起见,就直接在page_load里实现了:

 

public   partial   class  _Default : System.Web.UI.Page 
... {
    protected void Page_Load(object sender, EventArgs e)
    ...{
        RobsunConfigSectionHandler.RobsunPara para 
            = ConfigurationManager.GetSection("robsunGroup/robsunSection") as RobsunConfigSectionHandler.RobsunPara;

        Response.Write("CompanyName: " + para.CompanyName + "<br>");
        Response.Write("Path: " + para.Path + Environment.NewLine + "<br>");
        Response.Write("isPrivate: " + para.IsPrivate.ToString() + "<br>");
    }
}

以上只是对IConfigurationSectionHandler 接口的简单事例.配置文件的强大也只有在以后的工作中慢慢体会了.