随便写的，非常之简陋，也算是刚接触linq to xml的学习笔记吧
GuestBook.Core项目是数据访问、逻辑层,所有的留言的增、删、改、查都实现IDataProvider接口，本例是用的LinqXmlProvider类来实现
有些东东没写完，如管理员模式、回复留言等。
[code:c#]
public interface IDataProvider
{
void InsertMessage(GuestBookEntry msg);
List<GuestBookEntry> GetData();
List<GuestBookEntry> GetData(int StartIndex, int PageSize);
void Reply(GuestBookEntry msg);
void DeleteMessage(string id);
}
[/code]
InsertMessage的部分代码
[code:c#]
XElement doc = XDocument.Load(DataFile).Root;
doc.Add(new XElement("Message",
new XElement("ID", msg.ID),
new XElement("content", new XCData(msg.Content)),
new XElement("createdate", msg.CreateDate.ToString("yyyy-MM-dd HH:mm:ss")),
new XElement("Reply", msg.Reply),
new XElement("Author",msg.Author),
new XElement("IP", msg.IP)));
doc.Save(DataFile);
[/code]
获取
[code:c#]
public List<GuestBookEntry> GetData(int StartIndex, int PageSize)
{
List<GuestBookEntry> List = new List<GuestBookEntry>();
if (File.Exists(DataFile))
{
XDocument doc = XDocument.Load(DataFile);
try
{
var list = from a in
(from c in doc.Descendants("Message")
select new GuestBookEntry
{
Author = c.Element("Author").Value,
Content = c.Element("content").Value,
CreateDate = DateTime.Parse(c.Element("createdate").Value),
ID = c.Element("ID").Value,
IP = c.Element("IP").Value,
Reply = c.Element("Reply").Value
})
orderby a.CreateDate descending
select a;
List = new List<GuestBookEntry>(list.Skip(StartIndex).Take(PageSize));
}
catch { }
}
return List;
}
[/code]
删除:
[code:c#]
public void DeleteMessage(string id)
{
XElement doc = XElement.Load(DataFile);
var a = doc.Descendants("Message").Single(p => p.Element("ID").Value == id);
a.Remove();
doc.Save(DataFile);
}
[/code]
guestbook.rar (53.67 kb)