ConfigurationElementCollection中的無鍵元素

Question

當您繼承ConfigurationElementCollection時：

public class Directories : ConfigurationElementCollection
{
    ...
}

ConfigurationElementCollection需要GetElementKey(System.Configuration.ConfigurationElement) 。

但是我不在乎密鑰，因為我有一個自定義配置部分，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>

它可以具有多個元素，並且每個元素都是無密鑰的，並且此結構應允許重復（如上所述）。 那么在這種情況下我該怎么辦？

Answer 1

嘗試像這樣使用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);
    }
}