ConfigurationElementCollection 类
定义
重要
一些信息与预发行产品相关，相应产品在发行之前可能会进行重大修改。 对于此处提供的信息，Microsoft 不作任何明示或暗示的担保。
表示一个配置元素，该元素包含子元素的集合。
public ref class ConfigurationElementCollection abstract : System::Configuration::ConfigurationElement, System::Collections::ICollectionpublic abstract class ConfigurationElementCollection : System.Configuration.ConfigurationElement, System.Collections.ICollectiontype ConfigurationElementCollection = class
inherit ConfigurationElement
interface ICollection
interface IEnumerablePublic MustInherit Class ConfigurationElementCollection
Inherits ConfigurationElement
Implements ICollection- 继承
- 派生
- 实现
示例
以下示例演示如何使用 ConfigurationElementCollection。
第一个示例由三个类组成： UrlsSection、 UrlsCollection 和 UrlConfigElement。 类 UrlsSection 使用 ConfigurationCollectionAttribute 定义自定义配置节。 本部分包含由 UrlsCollection 类) 定义的 URL 元素的类) (定义的 UrlConfigElement URL 集合 (。
using System;
using System.Configuration;
// Define a UrlsSection custom section that contains a
// UrlsCollection collection of UrlConfigElement elements.
public class UrlsSection : ConfigurationSection
{
// Declare the UrlsCollection collection property.
[ConfigurationProperty("urls", IsDefaultCollection = false)]
[ConfigurationCollection(typeof(UrlsCollection),
AddItemName = "add",
ClearItemsName = "clear",
RemoveItemName = "remove")]
public UrlsCollection Urls
{
get
{
UrlsCollection urlsCollection =
(UrlsCollection)base["urls"];
return urlsCollection;
}
set
{
UrlsCollection urlsCollection = value;
}
}
// Create a new instance of the UrlsSection.
// This constructor creates a configuration element
// using the UrlConfigElement default values.
// It assigns this element to the collection.
public UrlsSection()
{
UrlConfigElement url = new UrlConfigElement();
Urls.Add(url);
}
}
// Define the UrlsCollection that contains the
// UrlsConfigElement elements.
// This class shows how to use the ConfigurationElementCollection.
public class UrlsCollection : ConfigurationElementCollection
{
public UrlsCollection()
{
}
public override ConfigurationElementCollectionType CollectionType
{
get
{
return ConfigurationElementCollectionType.AddRemoveClearMap;
}
}
protected override ConfigurationElement CreateNewElement()
{
return new UrlConfigElement();
}
protected override Object GetElementKey(ConfigurationElement element)
{
return ((UrlConfigElement)element).Name;
}
public UrlConfigElement this[int index]
{
get
{
return (UrlConfigElement)BaseGet(index);
}
set
{
if (BaseGet(index) != null)
{
BaseRemoveAt(index);
}
BaseAdd(index, value);
}
}
new public UrlConfigElement this[string Name]
{
get
{
return (UrlConfigElement)BaseGet(Name);
}
}
public int IndexOf(UrlConfigElement url)
{
return BaseIndexOf(url);
}
public void Add(UrlConfigElement url)
{
BaseAdd(url);
// Your custom code goes here.
}
protected override void BaseAdd(ConfigurationElement element)
{
BaseAdd(element, false);
// Your custom code goes here.
}
public void Remove(UrlConfigElement url)
{
if (BaseIndexOf(url) >= 0)
{
BaseRemove(url.Name);
// Your custom code goes here.
Console.WriteLine("UrlsCollection: {0}", "Removed collection element!");
}
}
public void RemoveAt(int index)
{
BaseRemoveAt(index);
// Your custom code goes here.
}
public void Remove(string name)
{
BaseRemove(name);
// Your custom code goes here.
}
public void Clear()
{
BaseClear();
// Your custom code goes here.
Console.WriteLine("UrlsCollection: {0}", "Removed entire collection!");
}
}
// Define the UrlsConfigElement elements that are contained
// by the UrlsCollection.
public class UrlConfigElement : ConfigurationElement
{
public UrlConfigElement(String name, String url, int port)
{
this.Name = name;
this.Url = url;
this.Port = port;
}
public UrlConfigElement()
{
}
[ConfigurationProperty("name", DefaultValue = "Contoso",
IsRequired = true, IsKey = true)]
public string Name
{
get
{
return (string)this["name"];
}
set
{
this["name"] = value;
}
}
[ConfigurationProperty("url", DefaultValue = "http://www.contoso.com",
IsRequired = true)]
[RegexStringValidator(@"\w+:\/\/[\w.]+\S*")]
public string Url
{
get
{
return (string)this["url"];
}
set
{
this["url"] = value;
}
}
[ConfigurationProperty("port", DefaultValue = (int)4040, IsRequired = false)]
[IntegerValidator(MinValue = 0, MaxValue = 8080, ExcludeRange = false)]
public int Port
{
get
{
return (int)this["port"];
}
set
{
this["port"] = value;
}
}
}
Imports System.Configuration
' Define a UrlsSection custom section that contains a
' UrlsCollection collection of UrlConfigElement elements.
Public Class UrlsSection
Inherits ConfigurationSection
' Declare the UrlsCollection collection property.
<ConfigurationProperty("urls", IsDefaultCollection:=False), ConfigurationCollection(GetType(UrlsCollection), AddItemName:="add", ClearItemsName:="clear", RemoveItemName:="remove")>
Public Property Urls() As UrlsCollection
Get
Dim urlsCollection As UrlsCollection = CType(MyBase.Item("urls"), UrlsCollection)
Return urlsCollection
End Get
Set(ByVal value As UrlsCollection)
Dim urlsCollection As UrlsCollection = value
End Set
End Property
' Create a new instance of the UrlsSection.
' This constructor creates a configuration element
' using the UrlConfigElement default values.
' It assigns this element to the collection.
Public Sub New()
Dim url As New UrlConfigElement()
Urls.Add(url)
End Sub
End Class
' Define the UrlsCollection that contains the
' UrlsConfigElement elements.
' This class shows how to use the ConfigurationElementCollection.
Public Class UrlsCollection
Inherits System.Configuration.ConfigurationElementCollection
Public Sub New()
End Sub
Public ReadOnly Property CollectionType() As ConfigurationElementCollectionType
Get
Return ConfigurationElementCollectionType.AddRemoveClearMap
End Get
End Property
Protected Overloads Overrides Function CreateNewElement() As ConfigurationElement
Return New UrlConfigElement()
End Function
Protected Overrides Function GetElementKey(ByVal element As ConfigurationElement) As Object
Return (CType(element, UrlConfigElement)).Name
End Function
Default Public Shadows Property Item(ByVal index As Integer) As UrlConfigElement
Get
Return CType(BaseGet(index), UrlConfigElement)
End Get
Set(ByVal value As UrlConfigElement)
If BaseGet(index) IsNot Nothing Then
BaseRemoveAt(index)
End If
BaseAdd(value)
End Set
End Property
Default Public Shadows ReadOnly Property Item(ByVal Name As String) As UrlConfigElement
Get
Return CType(BaseGet(Name), UrlConfigElement)
End Get
End Property
Public Function IndexOf(ByVal url As UrlConfigElement) As Integer
Return BaseIndexOf(url)
End Function
Public Sub Add(ByVal url As UrlConfigElement)
BaseAdd(url)
' Your custom code goes here.
End Sub
Protected Overloads Sub BaseAdd(ByVal element As ConfigurationElement)
BaseAdd(element, False)
' Your custom code goes here.
End Sub
Public Sub Remove(ByVal url As UrlConfigElement)
If BaseIndexOf(url) >= 0 Then
BaseRemove(url.Name)
' Your custom code goes here.
Console.WriteLine("UrlsCollection: {0}", "Removed collection element!")
End If
End Sub
Public Sub RemoveAt(ByVal index As Integer)
BaseRemoveAt(index)
' Your custom code goes here.
End Sub
Public Sub Remove(ByVal name As String)
BaseRemove(name)
' Your custom code goes here.
End Sub
Public Sub Clear()
BaseClear()
' Your custom code goes here.
Console.WriteLine("UrlsCollection: {0}", "Removed entire collection!")
End Sub
End Class
' Define the UrlsConfigElement elements that are contained
' by the UrlsCollection.
Public Class UrlConfigElement
Inherits ConfigurationElement
Public Sub New(ByVal name As String, ByVal url As String, ByVal port As Integer)
Me.Name = name
Me.Url = url
Me.Port = port
End Sub
Public Sub New()
End Sub
<ConfigurationProperty("name", DefaultValue:="Contoso", IsRequired:=True, IsKey:=True)>
Public Property Name() As String
Get
Return CStr(Me("name"))
End Get
Set(ByVal value As String)
Me("name") = value
End Set
End Property
<ConfigurationProperty("url", DefaultValue:="http://www.contoso.com", IsRequired:=True), RegexStringValidator("\w+:\/\/[\w.]+\S*")>
Public Property Url() As String
Get
Return CStr(Me("url"))
End Get
Set(ByVal value As String)
Me("url") = value
End Set
End Property
<ConfigurationProperty("port", DefaultValue:=CInt(4040), IsRequired:=False), IntegerValidator(MinValue:=0, MaxValue:=8080, ExcludeRange:=False)>
Public Property Port() As Integer
Get
Return CInt(Fix(Me("port")))
End Get
Set(ByVal value As Integer)
Me("port") = value
End Set
End Property
End Class
第二个代码示例使用之前指定的类。 将这两个示例合并到控制台应用程序项目中。
using System;
using System.Configuration;
using System.Text;
class UsingConfigurationCollectionElement
{
// Create a custom section and save it in the
// application configuration file.
static void CreateCustomSection()
{
try
{
// Get the current configuration file.
System.Configuration.Configuration config =
ConfigurationManager.OpenExeConfiguration(
ConfigurationUserLevel.None);
// Add the custom section to the application
// configuration file.
UrlsSection myUrlsSection = (UrlsSection)config.Sections["MyUrls"];
if (myUrlsSection == null)
{
// The configuration file does not contain the
// custom section yet. Create it.
myUrlsSection = new UrlsSection();
config.Sections.Add("MyUrls", myUrlsSection);
// Save the application configuration file.
myUrlsSection.SectionInformation.ForceSave = true;
config.Save(ConfigurationSaveMode.Modified);
}
else
if (myUrlsSection.Urls.Count == 0)
{
// The configuration file contains the
// custom section but its element collection is empty.
// Initialize the collection.
UrlConfigElement url = new UrlConfigElement();
myUrlsSection.Urls.Add(url);
// Save the application configuration file.
myUrlsSection.SectionInformation.ForceSave = true;
config.Save(ConfigurationSaveMode.Modified);
}
Console.WriteLine("Created custom section in the application configuration file: {0}",
config.FilePath);
Console.WriteLine();
}
catch (ConfigurationErrorsException err)
{
Console.WriteLine("CreateCustomSection: {0}", err.ToString());
}
}
static void ReadCustomSection()
{
try
{
// Get the application configuration file.
System.Configuration.Configuration config =
ConfigurationManager.OpenExeConfiguration(
ConfigurationUserLevel.None) as Configuration;
// Read and display the custom section.
UrlsSection myUrlsSection =
config.GetSection("MyUrls") as UrlsSection;
if (myUrlsSection == null)
{
Console.WriteLine("Failed to load UrlsSection.");
}
else
{
Console.WriteLine("Collection elements contained in the custom section collection:");
for (int i = 0; i < myUrlsSection.Urls.Count; i++)
{
Console.WriteLine(" Name={0} URL={1} Port={2}",
myUrlsSection.Urls[i].Name,
myUrlsSection.Urls[i].Url,
myUrlsSection.Urls[i].Port);
}
}
}
catch (ConfigurationErrorsException err)
{
Console.WriteLine("ReadCustomSection(string): {0}", err.ToString());
}
}
// Add an element to the custom section collection.
// This function uses the ConfigurationCollectionElement Add method.
static void AddCollectionElement()
{
try
{
// Get the current configuration file.
System.Configuration.Configuration config =
ConfigurationManager.OpenExeConfiguration(
ConfigurationUserLevel.None);
// Get the custom configuration section.
UrlsSection myUrlsSection = config.GetSection("MyUrls") as UrlsSection;
// Add the element to the collection in the custom section.
if (config.Sections["MyUrls"] != null)
{
UrlConfigElement urlElement = new UrlConfigElement();
urlElement.Name = "Microsoft";
urlElement.Url = "http://www.microsoft.com";
urlElement.Port = 8080;
// Use the ConfigurationCollectionElement Add method
// to add the new element to the collection.
myUrlsSection.Urls.Add(urlElement);
// Save the application configuration file.
myUrlsSection.SectionInformation.ForceSave = true;
config.Save(ConfigurationSaveMode.Modified);
Console.WriteLine("Added collection element to the custom section in the configuration file: {0}",
config.FilePath);
Console.WriteLine();
}
else
{
Console.WriteLine("You must create the custom section first.");
}
}
catch (ConfigurationErrorsException err)
{
Console.WriteLine("AddCollectionElement: {0}", err.ToString());
}
}
// Remove element from the custom section collection.
// This function uses one of the ConfigurationCollectionElement
// overloaded Remove methods.
static void RemoveCollectionElement()
{
try
{
// Get the current configuration file.
System.Configuration.Configuration config =
ConfigurationManager.OpenExeConfiguration(
ConfigurationUserLevel.None);
// Get the custom configuration section.
UrlsSection myUrlsSection = config.GetSection("MyUrls") as UrlsSection;
// Remove the element from the custom section.
if (config.Sections["MyUrls"] != null)
{
UrlConfigElement urlElement = new UrlConfigElement();
urlElement.Name = "Microsoft";
urlElement.Url = "http://www.microsoft.com";
urlElement.Port = 8080;
// Use one of the ConfigurationCollectionElement Remove
// overloaded methods to remove the element from the collection.
myUrlsSection.Urls.Remove(urlElement);
// Save the application configuration file.
myUrlsSection.SectionInformation.ForceSave = true;
config.Save(ConfigurationSaveMode.Full);
Console.WriteLine("Removed collection element from he custom section in the configuration file: {0}",
config.FilePath);
Console.WriteLine();
}
else
{
Console.WriteLine("You must create the custom section first.");
}
}
catch (ConfigurationErrorsException err)
{
Console.WriteLine("RemoveCollectionElement: {0}", err.ToString());
}
}
// Remove the collection of elements from the custom section.
// This function uses the ConfigurationCollectionElement Clear method.
static void ClearCollectionElements()
{
try
{
// Get the current configuration file.
System.Configuration.Configuration config =
ConfigurationManager.OpenExeConfiguration(
ConfigurationUserLevel.None);
// Get the custom configuration section.
UrlsSection myUrlsSection = config.GetSection("MyUrls") as UrlsSection;
// Remove the collection of elements from the section.
if (config.Sections["MyUrls"] != null)
{
myUrlsSection.Urls.Clear();
// Save the application configuration file.
myUrlsSection.SectionInformation.ForceSave = true;
config.Save(ConfigurationSaveMode.Full);
Console.WriteLine("Removed collection of elements from he custom section in the configuration file: {0}",
config.FilePath);
Console.WriteLine();
}
else
{
Console.WriteLine("You must create the custom section first.");
}
}
catch (ConfigurationErrorsException err)
{
Console.WriteLine("ClearCollectionElements: {0}", err.ToString());
}
}
public static void UserMenu()
{
string applicationName =
Environment.GetCommandLineArgs()[0] + ".exe";
StringBuilder buffer = new StringBuilder();
buffer.AppendLine("Application: " + applicationName);
buffer.AppendLine("Make your selection.");
buffer.AppendLine("? -- Display help.");
buffer.AppendLine("Q,q -- Exit the application.");
buffer.Append("1 -- Create a custom section that");
buffer.AppendLine(" contains a collection of elements.");
buffer.Append("2 -- Read the custom section that");
buffer.AppendLine(" contains a collection of custom elements.");
buffer.Append("3 -- Add a collection element to");
buffer.AppendLine(" the custom section.");
buffer.Append("4 -- Remove a collection element from");
buffer.AppendLine(" the custom section.");
buffer.Append("5 -- Clear the collection of elements from");
buffer.AppendLine(" the custom section.");
Console.Write(buffer.ToString());
}
// Obtain user's input and provide
// feedback.
static void Main(string[] args)
{
// Define user selection string.
string selection;
// Get the name of the application.
string appName =
Environment.GetCommandLineArgs()[0];
// Get user selection.
while (true)
{
UserMenu();
Console.Write("> ");
selection = Console.ReadLine();
if (!string.IsNullOrEmpty(selection))
break;
}
while (selection.ToLower() != "q")
{
// Process user's input.
switch (selection)
{
case "1":
// Create a custom section and save it in the
// application configuration file.
CreateCustomSection();
break;
case "2":
// Read the custom section from the
// application configuration file.
ReadCustomSection();
break;
case "3":
// Add a collection element to the
// custom section.
AddCollectionElement();
break;
case "4":
// Remove a collection element from the
// custom section.
RemoveCollectionElement();
break;
case "5":
// Clear the collection of elements from the
// custom section.
ClearCollectionElements();
break;
default:
UserMenu();
break;
}
Console.Write("> ");
selection = Console.ReadLine();
}
}
}
Imports System.Configuration
Imports System.Text
Friend Class UsingConfigurationCollectionElement
' Create a custom section and save it in the
' application configuration file.
Private Shared Sub CreateCustomSection()
Try
' Get the current configuration file.
Dim config As System.Configuration.Configuration = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None)
' Add the custom section to the application
' configuration file.
Dim myUrlsSection As UrlsSection = CType(config.Sections("MyUrls"), UrlsSection)
If myUrlsSection Is Nothing Then
' The configuration file does not contain the
' custom section yet. Create it.
myUrlsSection = New UrlsSection()
config.Sections.Add("MyUrls", myUrlsSection)
' Save the application configuration file.
myUrlsSection.SectionInformation.ForceSave = True
config.Save(ConfigurationSaveMode.Modified)
Else
If myUrlsSection.Urls.Count = 0 Then
' The configuration file contains the
' custom section but its element collection is empty.
' Initialize the collection.
Dim url As New UrlConfigElement()
myUrlsSection.Urls.Add(url)
' Save the application configuration file.
myUrlsSection.SectionInformation.ForceSave = True
config.Save(ConfigurationSaveMode.Modified)
End If
End If
Console.WriteLine("Created custom section in the application configuration file: {0}", config.FilePath)
Console.WriteLine()
Catch err As ConfigurationErrorsException
Console.WriteLine("CreateCustomSection: {0}", err.ToString())
End Try
End Sub
Private Shared Sub ReadCustomSection()
Try
' Get the application configuration file.
Dim config As System.Configuration.Configuration = TryCast(ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None), Configuration)
' Read and display the custom section.
Dim myUrlsSection As UrlsSection = TryCast(config.GetSection("MyUrls"), UrlsSection)
If myUrlsSection Is Nothing Then
Console.WriteLine("Failed to load UrlsSection.")
Else
Console.WriteLine("Collection elements contained in the custom section collection:")
For i As Integer = 0 To myUrlsSection.Urls.Count - 1
Console.WriteLine(" Name={0} URL={1} Port={2}", myUrlsSection.Urls(i).Name, myUrlsSection.Urls(i).Url, myUrlsSection.Urls(i).Port)
Next i
End If
Catch err As ConfigurationErrorsException
Console.WriteLine("ReadCustomSection(string): {0}", err.ToString())
End Try
End Sub
' Add an element to the custom section collection.
' This function uses the ConfigurationCollectionElement Add method.
Private Shared Sub AddCollectionElement()
Try
' Get the current configuration file.
Dim config As System.Configuration.Configuration = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None)
' Get the custom configuration section.
Dim myUrlsSection As UrlsSection = TryCast(config.GetSection("MyUrls"), UrlsSection)
' Add the element to the collection in the custom section.
If config.Sections("MyUrls") IsNot Nothing Then
Dim urlElement As New UrlConfigElement()
urlElement.Name = "Microsoft"
urlElement.Url = "http://www.microsoft.com"
urlElement.Port = 8080
' Use the ConfigurationCollectionElement Add method
' to add the new element to the collection.
myUrlsSection.Urls.Add(urlElement)
' Save the application configuration file.
myUrlsSection.SectionInformation.ForceSave = True
config.Save(ConfigurationSaveMode.Modified)
Console.WriteLine("Added collection element to the custom section in the configuration file: {0}", config.FilePath)
Console.WriteLine()
Else
Console.WriteLine("You must create the custom section first.")
End If
Catch err As ConfigurationErrorsException
Console.WriteLine("AddCollectionElement: {0}", err.ToString())
End Try
End Sub
' Remove element from the custom section collection.
' This function uses one of the ConfigurationCollectionElement
' overloaded Remove methods.
Private Shared Sub RemoveCollectionElement()
Try
' Get the current configuration file.
Dim config As System.Configuration.Configuration = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None)
' Get the custom configuration section.
Dim myUrlsSection As UrlsSection = TryCast(config.GetSection("MyUrls"), UrlsSection)
' Remove the element from the custom section.
If config.Sections("MyUrls") IsNot Nothing Then
Dim urlElement As New UrlConfigElement()
urlElement.Name = "Microsoft"
urlElement.Url = "http://www.microsoft.com"
urlElement.Port = 8080
' Use one of the ConfigurationCollectionElement Remove
' overloaded methods to remove the element from the collection.
myUrlsSection.Urls.Remove(urlElement)
' Save the application configuration file.
myUrlsSection.SectionInformation.ForceSave = True
config.Save(ConfigurationSaveMode.Full)
Console.WriteLine("Removed collection element from he custom section in the configuration file: {0}", config.FilePath)
Console.WriteLine()
Else
Console.WriteLine("You must create the custom section first.")
End If
Catch err As ConfigurationErrorsException
Console.WriteLine("RemoveCollectionElement: {0}", err.ToString())
End Try
End Sub
' Remove the collection of elements from the custom section.
' This function uses the ConfigurationCollectionElement Clear method.
Private Shared Sub ClearCollectionElements()
Try
' Get the current configuration file.
Dim config As System.Configuration.Configuration = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None)
' Get the custom configuration section.
Dim myUrlsSection As UrlsSection = TryCast(config.GetSection("MyUrls"), UrlsSection)
' Remove the collection of elements from the section.
If config.Sections("MyUrls") IsNot Nothing Then
myUrlsSection.Urls.Clear()
' Save the application configuration file.
myUrlsSection.SectionInformation.ForceSave = True
config.Save(ConfigurationSaveMode.Full)
Console.WriteLine("Removed collection of elements from he custom section in the configuration file: {0}", config.FilePath)
Console.WriteLine()
Else
Console.WriteLine("You must create the custom section first.")
End If
Catch err As ConfigurationErrorsException
Console.WriteLine("ClearCollectionElements: {0}", err.ToString())
End Try
End Sub
Public Shared Sub UserMenu()
Dim applicationName As String = Environment.GetCommandLineArgs()(0) & ".exe"
Dim buffer As New StringBuilder()
buffer.AppendLine("Application: " & applicationName)
buffer.AppendLine("Make your selection.")
buffer.AppendLine("? -- Display help.")
buffer.AppendLine("Q,q -- Exit the application.")
buffer.Append("1 -- Create a custom section that")
buffer.AppendLine(" contains a collection of elements.")
buffer.Append("2 -- Read the custom section that")
buffer.AppendLine(" contains a collection of custom elements.")
buffer.Append("3 -- Add a collection element to")
buffer.AppendLine(" the custom section.")
buffer.Append("4 -- Remove a collection element from")
buffer.AppendLine(" the custom section.")
buffer.Append("5 -- Clear the collection of elements from")
buffer.AppendLine(" the custom section.")
Console.Write(buffer.ToString())
End Sub
' Obtain user's input and provide
' feedback.
Shared Sub Main(ByVal args() As String)
' Define user selection string.
Dim selection As String
' Get the name of the application.
Dim appName As String = Environment.GetCommandLineArgs()(0)
' Get user selection.
Do
UserMenu()
Console.Write("> ")
selection = Console.ReadLine()
If selection <> String.Empty Then
Exit Do
End If
Loop
Do While selection.ToLower() <> "q"
' Process user's input.
Select Case selection
Case "1"
' Create a custom section and save it in the
' application configuration file.
CreateCustomSection()
Case "2"
' Read the custom section from the
' application configuration file.
ReadCustomSection()
Case "3"
' Add a collection element to the
' custom section.
AddCollectionElement()
Case "4"
' Remove a collection element from the
' custom section.
RemoveCollectionElement()
Case "5"
' Clear the collection of elements from the
' custom section.
ClearCollectionElements()
Case Else
UserMenu()
End Select
Console.Write("> ")
selection = Console.ReadLine()
Loop
End Sub
End Class
运行控制台应用程序时，会创建 类的 UrlsSection 实例，并在应用程序配置文件中生成以下配置元素：
<configuration>
<configSections>
<section name="MyUrls" type="UrlsSection,
ConfigurationElementCollection, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null" />
</configSections>
<MyUrls>
<urls>
<add name="Contoso" url="http://www.contoso.com" port="4040" />
</urls>
</MyUrls>
</configuration
注解
表示 ConfigurationElementCollection 配置文件中的元素的集合。
注意
配置文件中的元素引用基本 XML 元素或节。 简单元素是具有相关属性的 XML 标记（如果有）。 简单元素构成一个部分。 复杂节可以包含一个或多个简单元素、元素集合和其他节。
使用 ConfigurationElementCollection 来处理 对象的集合 ConfigurationElement 。 实现此类以将自定义 ConfigurationElement 元素的集合添加到 ConfigurationSection。
实施者说明
可以使用编程或声明性 (特性) 编码模型创建自定义配置元素。
编程模型要求为每个元素属性创建一个属性来获取和设置其值，并将其添加到基础 ConfigurationElement 基类的内部属性包。
声明性模型（也称为特性化模型）允许使用 属性定义元素属性，并使用属性对其进行配置。 这些属性指示 ASP.NET 配置系统属性类型及其默认值。 ASP.NET 可以使用反射获取此信息，然后创建元素属性对象并执行所需的初始化。
构造函数
| ConfigurationElementCollection() |
初始化 ConfigurationElementCollection 类的新实例。 |
| ConfigurationElementCollection(IComparer) |
创建 ConfigurationElementCollection 类的新实例。 |
属性
方法
显式接口实现
| ICollection.CopyTo(Array, Int32) |
将 ConfigurationElementCollection 复制到数组。 |
扩展方法
| Cast<TResult>(IEnumerable) |
将 IEnumerable 的元素强制转换为指定的类型。 |
| OfType<TResult>(IEnumerable) |
根据指定类型筛选 IEnumerable 的元素。 |
| AsParallel(IEnumerable) |
启用查询的并行化。 |
| AsQueryable(IEnumerable) |
将 IEnumerable 转换为 IQueryable。 |
