关于c＃：自定义配置部分的问题

Problems with custom config section

我正在尝试创建一个相当简单的自定义配置部分。我的班级是：

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namespace NetCenterUserImport
{
public class ExcludedUserList : ConfigurationSection
{
[ConfigurationProperty("name")]
public string Name
{
get { return (string)base["name"]; }
}

[ConfigurationProperty("excludedUser")]
public ExcludedUser ExcludedUser
{
get { return (ExcludedUser)base["excludedUser"]; }
}

[ConfigurationProperty("excludedUsers")]
public ExcludedUserCollection ExcludedUsers
{
get { return (ExcludedUserCollection)base["excludedUsers"]; }
}
}

[ConfigurationCollection(typeof(ExcludedUser), AddItemName ="add")]
public class ExcludedUserCollection : ConfigurationElementCollection
{
protected override ConfigurationElement CreateNewElement()
{
return new ExcludedUserCollection();
}

protected override object GetElementKey(ConfigurationElement element)
{
return ((ExcludedUser)element).UserName;
}
}

public class ExcludedUser : ConfigurationElement
{
[ConfigurationProperty("name")]
public string UserName
{
get { return (string)this["name"]; }
set { this["name"] = value; }
}
}
}

我的app.config是：

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当我尝试使用以下方法获取自定义配置节时：

我有个例外说

我肯定我遗漏了一些简单的东西，但我已经看了上面的十几个例子和答案，似乎找不到哪里出错了。