关于C#：自定义app.config部分，包含一个简单的”add”元素列表

Custom app.config section with a simple list of “add” elements

如何创建一个自定义app.config节，它只是一个简单的add元素列表？

我找到了几个例子(例如，如何在app.config中创建自定义配置节？)对于如下所示的自定义节：

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但如何避免额外的收集元素("公司")，使其看起来与appSettings和connectionStrings部分相同？换句话说，我想：

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相关讨论

基于op-config文件的代码的完整示例：

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下面是实现具有折叠集合的自定义配置节的示例代码

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using System.Configuration;
namespace My {
public class MyConfigSection : ConfigurationSection {
[ConfigurationProperty("", IsRequired = true, IsDefaultCollection = true)]
public MyConfigInstanceCollection Instances {
get { return (MyConfigInstanceCollection)this[""]; }
set { this[""] = value; }
}
}
public class MyConfigInstanceCollection : ConfigurationElementCollection {
protected override ConfigurationElement CreateNewElement() {
return new MyConfigInstanceElement();
}

protected override object GetElementKey(ConfigurationElement element) {
//set to whatever Element Property you want to use for a key
return ((MyConfigInstanceElement)element).Name;
}
}

public class MyConfigInstanceElement : ConfigurationElement {
//Make sure to set IsKey=true for property exposed as the GetElementKey above
[ConfigurationProperty("name", IsKey = true, IsRequired = true)]
public string Name {
get { return (string) base["name"]; }
set { base["name"] = value; }
}

[ConfigurationProperty("code", IsRequired = true)]
public string Code {
get { return (string) base["code"]; }
set { base["code"] = value; }
} } }

下面是一个如何从代码访问配置信息的示例。

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相关讨论

不需要自定义配置节。

App.CONFIG

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<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<configSections>
<section name="YourAppSettings" type="System.Configuration.AppSettingsSection, System.Configuration, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" />
</configSections>

<YourAppSettings>

</YourAppSettings>
</configuration>

检索

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// This casts to a NameValueCollection because the section is defined as a
/// AppSettingsSection in the configSections.
NameValueCollection settingCollection =
(NameValueCollection)ConfigurationManager.GetSection("YourAppSettings");

var items = settingCollection.Count;
Debug.Assert(items == 4); // no duplicates... the last one wins.
Debug.Assert(settingCollection["duplicate"] =="bb");

// Just keys as per original question? done... use em.
string[] allKeys = settingCollection.AllKeys;

// maybe you did want key/value pairs. This is flexible to accommodate both.
foreach (string key in allKeys)
{
Console.WriteLine(key +" :" + settingCollection[key]);
}

相关讨论

基于Jay Walker上面的答案，这是一个完整的工作示例，它增加了索引的能力：

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下面是实现具有折叠集合的自定义配置节的示例代码

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using System.Configuration;
using System.Linq;
namespace My
{
public class MyConfigSection : ConfigurationSection
{
[ConfigurationProperty("", IsRequired = true, IsDefaultCollection = true)]
public MyConfigInstanceCollection Instances
{
get { return (MyConfigInstanceCollection)this[""]; }
set { this[""] = value; }
}
}
public class MyConfigInstanceCollection : ConfigurationElementCollection
{
protected override ConfigurationElement CreateNewElement()
{
return new MyConfigInstanceElement();
}

protected override object GetElementKey(ConfigurationElement element)
{
//set to whatever Element Property you want to use for a key
return ((MyConfigInstanceElement)element).Name;
}

public new MyConfigInstanceElement this[string elementName]
{
get
{
return this.OfType<MyConfigInstanceElement>().FirstOrDefault(item => item.Name == elementName);
}
}
}

public class MyConfigInstanceElement : ConfigurationElement
{
//Make sure to set IsKey=true for property exposed as the GetElementKey above
[ConfigurationProperty("name", IsKey = true, IsRequired = true)]
public string Name
{
get { return (string)base["name"]; }
set { base["name"] = value; }
}

[ConfigurationProperty("code", IsRequired = true)]
public string Code
{
get { return (string)base["code"]; }
set { base["code"] = value; }
}
}
}

下面是一个如何从代码访问配置信息的示例。

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MyConfigSection config =
ConfigurationManager.GetSection("registerCompanies") as MyConfigSection;

Console.WriteLine(config.Instances["Honda Motors"].Code);
foreach (MyConfigInstanceElement e in config.Instances)
{
Console.WriteLine("Name: {0}, Code: {1}", e.Name, e.Code);
}

相关讨论

根据JayWalker的回答，需要通过迭代"实例"集合来访问元素。IE.

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var config = ConfigurationManager.GetSection("registerCompanies")
as MyConfigSection;

foreach (MyConfigInstanceElement e in config.Instances) {
Console.WriteLine("Name: {0}, Code: {1}", e.Name, e.Code);
}

配置中的.assembly给出了异常，因为我将项目命名为"my"而不是"my.assembly"。如果使用此示例，请小心！