SharePoint 2010中对查阅项的能力有了极大的增强，主要包括两个方面：
1、增加了映射字段（Project Field），通俗地说，就是在显示查阅项的时候，同时显示被查阅项目中的其他字段：
在视图中，可以同时显示这多个字段，但是在输入的时候，只选择一个字段即可，SharePoint 会自动将这些字段的值进行同步（没错，本质上他们是多个查阅项字段）。
2、增加了“强制关系行为”：
强制关系行为分为两种：“限制删除”是指，如果在删除主项的时候，发现该列表的条目查阅了这个主项，就不允许删除；“级联删除”是指，在删除主项的时候，同时删除所有该列表中查阅了这个主项的条目。当选中了“强制关系行为”之后，SharePoint会强制对这个字段进行索引，以便提高效率。
这种功能在2007的时代是非常常见的一种需求，当时只能使用一些事件处理程序进行定制开发才能完成，而目前已经成为了SharePoint内置功能。
不过，这里会有一个疑似的bug存在，之所以说是“疑似”，是因为这个问题的产生很有可能是“By Design”的：
假设有一个Sales列表，有一个Orders列表，在Orders列表中包含一个指向Sales的查阅项，并开启了强制删除。这两个表中的数据如下：
Sales：
| 标题 |
| 张三 |
| 李四 |
Orders：
| 标题 | 销售（查阅项） |
| Office 2010 | 张三 |
| SharePoint 2010 | 张三 |
| Windows 2008 R2 | 李四 |
如果先删除了Orders列表中的“Office 2010”，然后再删除Sales列表中的“张三”（这个时候因为设置了级联删除，所以Orders中另外的“SharePoint 2010”也会被删除掉）。此时，在回收站里可以看到“Office 2010”和“张三”这两个条目（其中“张三”是一个级联删除条目，图标略有不同，恢复这个的时候会把所有连带删除的子项也一起恢复）。
此时，在回收站中如果先恢复“Office 2010”的话，页面就会变成一片空白，没有任何报错提示信息，也没有任何内容，并且这个条目并没有被恢复出来。但如果先恢复“张三”、再恢复“Office 2010”就一切正常（两个一起恢复都不行）。
其实这种行为仔细想来也是可以理解的，因为设置了“强制关系”嘛……不过，总归要有一个提示信息吧……
打印 | 张贴于 2010-07-11 11:25:25 | Tag:暂无标签
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