我正在实现一个在计算机之间同步文件的客户端 - 服务器程序。 在某些时候,当客户端连接到服务器时,包含必须与服务器同步的位置的目录结构的XML文件将发送到服务器。 如果它不是客户端第一次连接,则在服务器上存在这样的XML文件,因此必须找到这两个文件之间的差异,并且仅从客户端请求已更改的文件或新文件。 我的问题是......我怎样才能找到XML之间的差异。 我有2个XML样本(一个XML可以有1Gb)。
第一个XML(source.xml):
<?xml version='1.0'?>
<RootDirectory name="New folder" dateCreated="5/20/2013 7:16:32 PM">
<Folder name="New folder1" >
<File name="New Text Document11.txt" />
<File name="New Text Document12.txt" />
</Folder>
<File name="New Text Document1.txt" />
</RootDirectory>
第二个XML(changed.xml):
<?xml version="1.0" encoding="UTF-8"?>
<RootDirectory name="New folder" dateCreated="5/20/2013 7:15:50 PM">
<Folder name="New folder1">
<File name="New Text Document11.txt" />
<File name="New Text Document12.txt" />
</Folder>
<Folder name="New folder2">
<Folder name="New folder21">
<File name="New Text Document211.txt" />
<Folder name="New folder211">
<File name="New Text Document2111.txt" />
<Folder name="New folder2111">
<File name="New Text Document21111.txt" />
</Folder>
</Folder>
</Folder>
<File name="New Text Document21.txt" />
</Folder>
<File name="New Text Document1.txt" />
</RootDirectory>
我找到了一个使用LinQ to XML http://www.codeproject.com/Articles/45233/Diff-in-XML-files-with-LINQ的示例,但是那里使用的XML结构有所不同,而且对我没什么帮助。
鉴于我可以将标记Folder
和File
嵌套在其他节点中。我真的不知道如何找到差异......
有人可以给我一个想法吗?
谢谢!
最诚挚的问候, 瓦娜
答案 0 :(得分:0)
可能的解决方案可能是这样的算法:
示例代码:
var xml1 = @"<?xml version='1.0'?>
<RootDirectory name=""New folder"" dateCreated=""5/20/2013 7:16:32 PM"">
<Folder name=""New folder1"" >
<File name=""New Text Document11.txt"" />
<File name=""New Text Document12.txt"" />
</Folder>
<File name=""New Text Document1.txt"" />
</RootDirectory>";
var xml2 = @"<?xml version=""1.0"" encoding=""UTF-8""?>
<RootDirectory name=""New folder"" dateCreated=""5/20/2013 7:15:50 PM"">
<Folder name=""New folder1"">
<File name=""New Text Document11.txt"" />
<File name=""New Text Document12.txt"" />
<File name=""New Text Document13.txt"" />
</Folder>
<Folder name=""New folder2"">
<Folder name=""New folder21"">
<File name=""New Text Document211.txt"" />
<Folder name=""New folder211"">
<File name=""New Text Document2111.txt"" />
<Folder name=""New folder2111"">
<File name=""New Text Document21111.txt"" />
</Folder>
</Folder>
</Folder>
<File name=""New Text Document21.txt"" />
</Folder>
<File name=""New Text Document1.txt"" />
</RootDirectory>";
var xmlDoc1 = XDocument.Parse(xml1);
var xmlDoc2 = XDocument.Parse(xml2);
var f1 = allFolders(xmlDoc1.Root);
var f2 = allFolders(xmlDoc2.Root);
var newFolders = f2.Except(f1);
var sameFolders = f2.Intersect(f1);
// completely new folders, content is new => no further checks needed!
newFolders.Dump();
// check if content of same folders has changed
foreach (var sameFolder in sameFolders)
{
var oldContent = folderContent(xmlDoc1.Root.Descendants("Folder").Where (r => r.Attribute("name").Value == sameFolder).ToList());
var newContent = folderContent(xmlDoc2.Root.Descendants("Folder").Where (r => r.Attribute("name").Value == sameFolder).ToList());
var newFiles = newContent.Except(oldContent);
}
private List<string> folderContent(IEnumerable<XElement> nodes)
{
var files = new List<String>();
nodes.ToList().ForEach(n => files.AddRange(n.Elements("File").Select (x => x.Attribute("name").Value).ToList()));
return files;
}
private List<string> allFolders(XElement node)
{
var folders = node.Descendants("Folder").ToList().Select (e => e.Attribute("name").Value).ToList();
return folders;
}
输出:
//changed folders
New folder2
New folder21
New folder211
New folder2111
// new files for New folder 1
NewTextDocument13.txt