我有两个XML文件需要比较差异，XML非常简单：
文件1：
<?xml version="1.0" encoding="utf-8"?>
<Feeds zone="my zone">
<Feed name="attribDump.json">ac1f07edc491a3d237cdfb1a17fc4551</Feed>
<Feed name="focus_GroupsKV.txt">0f9e0a14a4ffce6ff5065b6e088c1f84</Feed>
<Feed name="NAM_FORMATTED.csv">9e875496cdb072b5e54318d51295fdba</Feed>
<Feed name="BNP\activityTitles.txt">2d27c0f19b71b4b411bcb00011d3f8b0</Feed>
</Feeds>
和文件2：
<?xml version="1.0" encoding="utf-8"?>
<FeedsRequest version="1">
<Feeds zone="my zone">
<Feed name="attribDump.json">ac1f07edc491a3d237cdfb1a17fc4551</Feed>
<Feed name="focus_GroupsKV.txt">0f9e0a14a4ffce6ff5065b6e088c1f84</Feed>
<Feed name="BNP\activityTitles.txt">e54c5b851ee3ff3f43b10d24f2316431</Feed>
</Feeds>
</FeedsRequest>
文件1是我们文件共享上的文件的清单列表，文件2由需要从文件1刷新的断开连接的设备使用。我需要进行的检查是1）确保所有提要文件1位于文件2中，2）确保找到的任何源具有相同的hashCode（长字符串）。一旦检查完成，我需要创建一个响应文件，其中包含所有提要的列表，然后每个提供ok（找到并匹配文件），缺少（找不到文件）的属性，或更新（文件被发现，但它是旧版本）。
所以基本上结果文件看起来像这样：
<?xml version="1.0" encoding="utf-8"?>
<FeedsResponse version="1">
<Feeds zone="my zone">
<Feed name="attribDump.json" status="ok">ac1f07edc491a3d237cdfb1a17fc4551</Feed>
<Feed name="focus_GroupsKV.txt" status="ok">0f9e0a14a4ffce6ff5065b6e088c1f84</Feed>
<Feed name="NAM_FORMATTED.csv" status="missing">afd2c620053ed4f85ab02b4cc5f7a2b2</Feed>
<Feed name="BNP\activityTitles.txt" status="updated">90805b851ee3ff3f43b10d24f2316431</Feed>
我目前正在做的是循环遍历文件1中的所有文件，然后针对文件2检查它们之间的差异。自从我使用XML以来，我遇到了困难，是如何构建响应文档的。
FileInfo feedList = new FileInfo(_feedList);
FileInfo feedRequest = new FileInfo(_feedRequest);
// Load the documents
XmlDocument feedListXmlDoc = new XmlDocument();
feedListXmlDoc.Load(_feedList);
// Load the documents
XmlDocument feedRequestXmlDoc = new XmlDocument();
feedRequestXmlDoc.Load(_feedRequest);
//create response doc
XmlDocument feedResponseXmlDoc = new XmlDocument();
// Define a single node
XmlNode feedListNode;
XmlNode feedRequestNode;
// Get the root Xml element
XmlElement feedListRoot = feedListXmlDoc.DocumentElement;
XmlElement feedRequestRoot = feedRequestXmlDoc.DocumentElement;
// Get a list of all player names
XmlNodeList feedListXml = feedListRoot.GetElementsByTagName("Feed");
XmlNodeList feedRequestXml = feedRequestRoot.GetElementsByTagName("Feed");
// Create an XmlWriterSettings object with the correct options.
XmlWriter writer = null;
XmlWriterSettings settings = new XmlWriterSettings();
settings.Indent = true;
settings.IndentChars = (" ");
settings.OmitXmlDeclaration = false;
// Create the XmlWriter object and write some content.
writer = XmlWriter.Create(_resultPath, settings);
writer.WriteStartElement("FeedsDiff");
// The compare algorithm
bool feedMatch = false;
int j = 0;
try
{
// loop through list of current feeds
for (int i = 0; i < feedListXml.Count; i++)
{
feedListNode = feedListXml.Item(i);
string feedListName = feedListNode.Attributes["name"].Value.ToString();
string feedListHash = feedListXml.Item(i).InnerText.ToString();
//check feed request list for a match
while (j < feedRequestXml.Count && feedMatch == false)
{
feedRequestNode = feedRequestXml.Item(j);
string feedRequestName = feedRequestNode.Attributes["name"].Value.ToString();
//checks to see if feed names match
if (feedListName == feedRequestName)
{
feedMatch = true;
string feedRequestHash = feedRequestXml.Item(j).InnerText.ToString();
//since we found the node, we can remove it from the request list
XmlNode node = feedRequestNode.ParentNode;
node.RemoveChild(feedRequestNode);
//checks to see if hash codes match
if (feedListHash == feedRequestHash)
{
//if name and code match, move to the next one
feedMatch = true;
//add 'status="ok"' attribute to the node
//feedResponseXmlDoc.ImportNode(feedRequestNode,false);
Debug.WriteLine(feedListName + " name and hash match");
j = 0;
}
else
{
feedMatch = true;
//feed has been updated since last device sync
//need to add status='update' attribute and append file to response
Debug.WriteLine(feedListName + " name matched but hash did not");
}
}
else
{
//names didn't match
//add status="missing" to the node
j++;
}
}
feedMatch = false;
}
// end Xml document
writer.WriteEndElement();
writer.Flush();
}
finally
{
if (writer != null)
writer.Close();
}
现在我正在尝试在循环之前实例化响应文档然后只是添加元素，因为我们很难找到一个简洁的方法来完成它。任何帮助表示赞赏。
答案 0 :(得分：0)
在CodePlex上查看我的开源项目differ中的CodeBlocks，它是专为此类情况而设计的。它在Nuget上也可以作为“differ”
答案 1 :(得分：0)
我明白了：
public void CompareXml(string _feedList, string _feedRequest, string _resultPath)
{
FileInfo feedList = new FileInfo(_feedList);
FileInfo feedRequest = new FileInfo(_feedRequest);
// Load the documents
XmlDocument feedListXmlDoc = new XmlDocument();
feedListXmlDoc.Load(_feedList);
// Load the documents
XmlDocument feedRequestXmlDoc = new XmlDocument();
feedRequestXmlDoc.Load(_feedRequest);
// Define a single node
XmlNode feedListNode;
XmlNode feedRequestNode;
// Get the root Xml element
XmlElement feedListRoot = feedListXmlDoc.DocumentElement;
XmlElement feedRequestRoot = feedRequestXmlDoc.DocumentElement;
// Get a list of feeds for the stored list and the request
XmlNodeList feedListXml = feedListRoot.GetElementsByTagName("Feed");
XmlNodeList feedRequestXml = feedRequestRoot.GetElementsByTagName("Feed");
bool feedLocated = false;
int j = 0;
try
{
// loop through list of current feeds
for (int i = 0; i < feedListXml.Count; i++)
{
feedListNode = feedListXml.Item(i);
//create status attribute
XmlAttribute attr = feedListXmlDoc.CreateAttribute("status");
string feedListName = feedListNode.Attributes["name"].Value.ToString();
string feedListHash = feedListXml.Item(i).InnerText.ToString();
//check feed request list for a match
while (j < feedRequestXml.Count && feedLocated == false)
{
feedRequestNode = feedRequestXml.Item(j);
string feedRequestName = feedRequestNode.Attributes["name"].Value.ToString();
//checks to see if feed names match
if (feedRequestName == feedListName)
{
string feedRequestHash = feedRequestXml.Item(j).InnerText.ToString();
//checks to see if hashCodes match
if (feedListHash == feedRequestHash)
{
//if name and code match, set status to ok
attr.Value = "ok";
Debug.WriteLine(feedListName + " name and hash match. Status: 'ok'");
}
else
{
//if hashCodes don't match, set status attribute to updated
attr.Value = "updated";
Debug.WriteLine(feedListName + " name matched but hash did not. Status: 'updated'");
}
feedListNode.Attributes.Append(attr);
feedLocated = true;
}
else
{
//names didn't match, checking to see if we're at the end of the request list
if (j + 1 == feedRequestXml.Count)
{
//file name wasn't found in the request list, set status attribute to missing
attr.Value = "missing";
feedListNode.Attributes.Append(attr);
feedLocated = true;
j = 0;
Debug.WriteLine("Reached the end of the file request list without a match. Status: 'missing'");
}
//file name wasn't located on this pass, move to next record
j++;
}
}
feedLocated = false;
}
}
finally
{
Debug.WriteLine("Result file has been written out at " + _resultPath);
}
feedListXmlDoc.Save(_resultPath);
}