我正在尝试为 .NET4 应用程序编写一个非常简单的自定义配置部分。我的目标是:

<configuration>
  <configSections>
    <section name="myServices" type="My.ConfigSection, My.Assembly" />
  </configSections>
  <myServices>
    <add name="First" />
    <add name="Second" />
  </myServices>
</configuration>

但是，当我调用 ConfigurationManager.GetSection("myServices") 时，我不断收到 ConfigurationErrorsException: 'Unrecognized element 'add''。我已经盯着它看了一段时间了，但还没有弄清楚我做错了什么。下面是我的代码。它包含三个类:ConfigSection、MyServiceSettingsCollection 和 MyServiceSettings。

首先是代表整个配置部分的类。它有一个类型为 MyServiceSettingsCollection 的无名默认集合。 IsDefaultCollection属性应该允许我从根元素直接“添加”到我的集合。

public sealed class ConfigSection : ConfigurationSection
{
  private static readonly ConfigurationProperty _propMyServices;

  private static readonly ConfigurationPropertyCollection _properties;

  public static ConfigSection Instance { get { return _instance; } }

  static ConfigSection()
  {
    _propMyServices = new ConfigurationProperty(
          null, typeof(MyServiceSettingsCollection), null,
          ConfigurationPropertyOptions.IsDefaultCollection);
    _properties = new ConfigurationPropertyCollection { _propMyServices };
  }

  [ConfigurationProperty("", IsDefaultCollection = true)]
  public MyServiceSettingsCollection MyServices
  {
    get { return (MyServiceSettingsCollection) base[_propMyServices]; }
    set { base[_propMyServices] = value; }
  }

  protected override ConfigurationPropertyCollection Properties
  { get { return _properties; } }
}

接下来是集合类本身。它的类型是 AddRemoveClearMap .

[ConfigurationCollection(typeof(MyServiceSettings),
    CollectionType = ConfigurationElementCollectionType.AddRemoveClearMap)]
public sealed class MyServiceSettingsCollection : ConfigurationElementCollection
{
  public MyServiceSettings this[int index]
  {
    get { return (MyServiceSettings) BaseGet(index); }
    set
    {
      if (BaseGet(index) != null) { BaseRemoveAt(index); }
      BaseAdd(index, value);
    }
  }

  public new MyServiceSettings this[string key]
  {
    get { return (MyServiceSettings) BaseGet(key); }
  }

  protected override ConfigurationElement CreateNewElement()
  {
    return new MyServiceSettings();
  }

  protected override object GetElementKey(ConfigurationElement element)
  {
    return ((MyServiceSettings) element).Key;
  }
}

最后是集合中元素的类。目前，此类只有一个属性，但以后会有更多属性(这使我无法使用 NameValueSectionHandler )。

public class MyServiceSettings : ConfigurationElement
{
  private static readonly ConfigurationProperty _propName;

  private static readonly ConfigurationPropertyCollection properties;

  static MyServiceSettings()
  {
    _propName = new ConfigurationProperty("name", typeof(string), null, null,
                                          new StringValidator(1),
                                          ConfigurationPropertyOptions.IsRequired |
                                          ConfigurationPropertyOptions.IsKey);
    properties = new ConfigurationPropertyCollection { _propName };
  }

  [ConfigurationProperty("name", DefaultValue = "",
        Options = ConfigurationPropertyOptions.IsRequired |
                  ConfigurationPropertyOptions.IsKey)]
  public string Name
  {
      get { return (string) base[_propKey]; }
      set { base[_propKey] = value; }
  }

  protected override ConfigurationPropertyCollection Properties
  { get { return properties; } }
}

最佳答案

好的，我找到了看似随机的修复程序。而不是这个:

[ConfigurationProperty("", IsDefaultCollection = true)]
public ProvisiorServiceSettingsCollection ProvisiorServices
{ ... }

你应该使用:

[ConfigurationProperty("", Options = ConfigurationPropertyOptions.IsDefaultCollection)]
public ProvisiorServiceSettingsCollection ProvisiorServices
{ ... }

不知道两者有什么区别。对我来说，它们看起来惊人地相似……或者至少，没有任何地方表明为什么一个比另一个更受欢迎。

关于c# - .NET4 中带有集合的简单自定义配置部分，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/7066274/