IConfigurationSectionHandler 接口的用法

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
    {
        code#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.

转载于:https://www.cnblogs.com/Robsun/archive/2007/01/18/624040.html