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我读到 Outlook 使用对话索引来显示对话中电子邮件的层次结构。我正在尝试在我的应用程序中实现相同的功能。为此,我试图让会话索引实现对会话索引的值(或特定字段的值)的排序功能。问题是,我无法将对话索引转换为一些可排序的字符串值??