配置集合 - 无法识别的元素“条目”

我希望有人能帮我弄清楚我在这里做错了什么。我的 web.config 中有一个自定义部分：

<invalidCharactorGroup>
 <entries>
   <entry name="entry1" oldChar="É" newChar="E"/>
   <entry name="entry2" oldChar="B" newChar="C"/>
 </entries>
</invalidCharactorGroup>

声明

<sectionGroup name="invalidCharactorGroup">
  <section name="entries" 
           type="WSTG.Config.InvalidCharactorSection, WSTGEcomLibrary, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null" 
           allowLocation="true" 
           allowDefinition="Everywhere" />          
</sectionGroup>

它得到这个错误：

Unrecognized element 'entry'.

以下是我的课程：

public class InvalidCharactorSection : ConfigurationSection
{
    [ConfigurationProperty("entries")]
    [ConfigurationCollection(typeof(InvalidEntryElementCollection), AddItemName = "entry")]
    public InvalidEntryElementCollection Entries
    {
        get { return ((InvalidEntryElementCollection)(base["entries"])); }
        set { base["entries"] = value; }
    }
}

public class InvalidEntryElementCollection : ConfigurationElementCollection
{
    internal const string PropertyName = "Entry";
    public override ConfigurationElementCollectionType CollectionType
    {
        get
        {
            return ConfigurationElementCollectionType.BasicMapAlternate;
        }
    }
    protected override string ElementName
    {
        get
        {
            return PropertyName;
        }
    }
    protected override bool IsElementName(string elementName)
    {
        return elementName.Equals(PropertyName, StringComparison.InvariantCultureIgnoreCase);
    }

    public override bool IsReadOnly()
    {
        return false;
    }

    protected override ConfigurationElement CreateNewElement()
    {
        return new Entry();
    }
    protected override object GetElementKey(ConfigurationElement element)
    {
        return ((Entry)(element)).name;
    }
    public Entry this[int idx]
    {
        get
        {
            return (Entry)BaseGet(idx);
        }
    }
}

public class Entry : ConfigurationElement
{
    [ConfigurationProperty("name", DefaultValue = "", IsKey = true, IsRequired = true)]
    public string name
    {
        get { return (string)base["name"]; }
        set { base["name"] = value; }
    }
    [ConfigurationProperty("oldChar", DefaultValue = "", IsKey = false, IsRequired = true)]
    public string oldChar
    {
        get { return (string)base["oldChar"]; }
        set { base["oldChar"] = value; }
    }

    [ConfigurationProperty("newChar", DefaultValue = "", IsKey = false, IsRequired = true)]
    public string newChar
    {
        get { return (string)base["newChar"]; }
        set { base["newChar"] = value; }
    }
}