ConfigurationElementCollection中的无键元素

Question

当您继承ConfigurationElementCollection时：

public class Directories : ConfigurationElementCollection
{
    ...
}

ConfigurationElementCollection需要GetElementKey(System.Configuration.ConfigurationElement) 。

但是我不在乎密钥，因为我有一个自定义配置部分，如下所示：

<directorySection>
  <directories>
    <directory pickUpDirectory="C:\Users\User\Documents\PickUp\0" dropOffDirectory="C:\Users\User\Documents\DropOff\0"/>
    <directory pickUpDirectory="C:\Users\User\Documents\PickUp\0" dropOffDirectory="C:\Users\User\Documents\DropOff\0"/>
    <directory pickUpDirectory="C:\Users\User\Documents\PickUp\1" dropOffDirectory="C:\Users\User\Documents\DropOff\1"/>
    <directory pickUpDirectory="C:\Users\User\Documents\PickUp\2" dropOffDirectory="C:\Users\User\Documents\DropOff\2"/>
  </directories>
</directorySection>

它可以具有多个元素，并且每个元素都是无密钥的，并且此结构应允许重复（如上所述）。 那么在这种情况下我该怎么办？

Answer 1

尝试像这样使用ObjectIDGenerator

[ConfigurationCollection(typeof(SchedulerTaskItem), AddItemName = "Task")]
public class SchedulerTaskCollection: ConfigurationElementCollection
{
    private static readonly ObjectIDGenerator idGenerator = new ObjectIDGenerator();

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

    protected override object GetElementKey(ConfigurationElement element)
    {
        bool firstTime;
        return idGenerator.GetId(element, out firstTime);
    }
}