节处理程序解释并处理 Web.config 文件特定部分中 XML 配置元素中定义的设置，并根据配置设置返回适当的配置对象。
处理程序类返回的配置对象可以是任何数据结构；它不限于任何基配置类或配置格式。
ASP.NET 使用该配置对象，以对自定义配置元素进行读取和写入。
1、创建自定义配置节处理程序
创建一个继承 System.Configuration.ConfigurationSection 类的公共类
public class MyHandler : ConfigurationSection { public MyHandler() { } public MyHandler(String attribVal) { MyAttrib1 = attribVal; } [ConfigurationProperty("myAttrib1", DefaultValue = "Clowns", IsRequired = true)] [StringValidator(InvalidCharacters = "~!@#$%^&*()[]{}/;'"|\", MinLength = 1, MaxLength = 60)] public String MyAttrib1 { get { return (String)this["myAttrib1"]; } set { this["myAttrib1"] = value; } } [ConfigurationProperty("myChildSection")] public MyChildConfigElement MyChildSection { get { return (MyChildConfigElement)this["myChildSection"]; } set { this["myChildSection"] = value; } } } public class MyChildConfigElement : ConfigurationElement { public MyChildConfigElement() { } public MyChildConfigElement(String a1, String a2) { MyChildAttribute1 = a1; MyChildAttribute2 = a2; } [ConfigurationProperty("myChildAttrib1", DefaultValue = "Zippy", IsRequired = true)] [StringValidator(InvalidCharacters = "~!@#$%^&*()[]{}/;'"|\", MinLength = 1, MaxLength = 60)] public String MyChildAttribute1 { get { return (String)this["myChildAttrib1"]; } set { this["myChildAttrib1"] = value; } } [ConfigurationProperty("myChildAttrib2", DefaultValue = "Michael Zawondy", IsRequired = true)] [StringValidator(InvalidCharacters = "~!@#$%^&*()[]{}/;'"|\", MinLength = 1, MaxLength = 60)] public String MyChildAttribute2 { get { return (String)this["myChildAttrib2"]; } set { this["myChildAttrib2"] = value; } } }
2、向 ASP.NET 配置文件添加自定义节处理程序
<configuration> <configSections> <sectionGroup name="myCustomGroup"> <section name="myCustomSection" type="MyConfigSectionHandler.MyHandler, MyCustomConfigurationHandler, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null" allowLocation="true" allowDefinition="Everywhere" /> </sectionGroup> </configSections> <myCustomGroup> <myCustomSection myAttrib1="Clowns"> <myChildSection myChildAttrib1="Zippy" myChildAttrib2="Michael Zawondy "/> </myCustomSection> </myCustomGroup> </configuration>
3、以编程方式访问自定义配置数据
获取自定义配置对象的一个实例，并使用 GetSection 方法或 GetSection 方法来填充该实例。
下面的 ASPX 页的示例使用前一个示例，以枚举自定义配置节的属性和子元素。
<%@ Page Language="C#" %> <script runat="server"> protected void Button1_Click(object sender, EventArgs e) { MyConfigSectionHandler.MyHandler config = (MyConfigSectionHandler.MyHandler)System.Configuration.ConfigurationManager.GetSection( "myCustomGroup/myCustomSection"); StringBuilder sb = new StringBuilder(); sb.Append("<h2>Attributes in the myCustomSection Element:</h2>"); sb.AppendFormat("myAttrib1 = {0}<br/>", config.MyAttrib1.ToString()); sb.Append("<h2>Attributes in the myChildSection Element:</h2>"); sb.AppendFormat("myChildAttrib1 = {0}<br/>", config.MyChildSection.MyChildAttribute1.ToString()); sb.AppendFormat("myChildAttrib2 = {0}<br/>", config.MyChildSection.MyChildAttribute2.ToString()); Label1.Text = sb.ToString(); Label1.Visible = true; } </script> <html xmlns="http://www.w3.org/1999/xhtml" > <head runat="server"> <title>Untitled Page</title> </head> <body> <form id="form1" runat="server"> <div> <h1>Enumerate MyCustomSection</h1> <asp:Label ID="Label1" runat="server" Text="" /> <br /> <asp:Button ID="Button1" runat="server" Text="Get Custom Config Info" OnClick="Button1_Click" /> </div> </form> </body> </html>