通过XML迭代？(Iteration through XML?)

我有一个6GB的XML文件，我正在使用XmlReader循环遍历该文件。文件很大但我无能为力。我使用LINQ，但是大小不允许我使用XDocument，因为我得到一个OutOfMemory错误。

我正在使用XmlReader循环遍历整个文件并提取我需要的内容。我正在包含一个示例XML文件。

从本质上讲，这就是我的工作：

查找标签容器。如果找到，则检索属性“ID”。如果“ID”以LOCAL开头，那么这就是我要阅读的内容。读取器循环，直到我找到值为CELL_FD的标签Family 找到后，循环reader.read（）直到找到标签IMPORTANT_VALUE 。找到后，读取IMPORTANT_VALUE的值。我已经完成了这个容器，所以继续循环直到我找到下一个Container （这是休息的地方）。

这是我阅读文件和查找相关值的简化版本。

while (myReader.Read()) { if ((myReader.Name == "CONTAINER")) { if (myReader.HasAttributes) { string Attribute = myReader.GetAttribute("id"); if (Attribute.IndexOf("LOCAL_") >= 0) { while (myReader.Read()) { if (myReader.Name == "FAMILY") { myReader.Read();//read value string Family = myReader.Value; if (Family == "CELL_FDD") { while (myReader.Read()) { if ((myReader.Name == "IMPORTANT_VALUE")) { myReader.Read(); string Counter = myReader.Value; Console.WriteLine(Attribute + " (found: " + Counter + ")"); break; } } } } } } } } }

这是XML：

<es:esFD xmlns:es="File.xsd"> <vs:vsFD xmlns:vs="OTHER_FILE.xsd"> <CONTAINER id="LOCAL_CONTAINER1"> <ATTRIBUTES> <FAMILY>CELL_FDD</FAMILY> <CELL_FDD> <VAL1>1.1.2.3</VAL1> <VAL2>JSMITH</VAL2> <VAL3>320</VAL3> <IMPORTANT_VALUE>VERY</IMPORTANT_VALUE> <VAL4>320</VAL4> </CELL_FDD> <FAMILY>BLAH</FAMILY> <BLAH> <VAL1>1.4.43.3</VAL1> <VAL2>NA</VAL2> <VAL3>349</VAL3> <IMPORTANT_VALUE>NA</IMPORTANT_VALUE> <VAL4>43</VAL4> <VAL5>00</VAL5> <VAL6>12</VAL6> </BLAH> </ATTRIBUTES> </CONTAINER> <CONTAINER id="FOREIGN_ELEMENT1"> <ATTRIBUTES> <FAMILY>CELL_FDD</FAMILY> <CELL_FDD> <VAL1>1.1.2.3</VAL1> <VAL2>JSMITH</VAL2> <VAL3>320</VAL3> <IMPORTANT_VALUE>VERY</IMPORTANT_VALUE> <VAL4>320</VAL4> </CELL_FDD> <FAMILY>BLAH</FAMILY> <BLAH> <VAL1>1.4.43.3</VAL1> <VAL2>NA</VAL2> <VAL3>349</VAL3> <IMPORTANT_VALUE>NA</IMPORTANT_VALUE> <VAL4>43</VAL4> <VAL5>00</VAL5> <VAL6>12</VAL6> </BLAH> </ATTRIBUTES> </CONTAINER> </vs:vsFD> </es:esFD>

如何摆脱最内圈，以便达到最顶层的循环？

I have a 6GB XML file and I'm using XmlReader to loop through the file. The file's huge but there's nothing I can do about that. I use LINQ, but the size doesn't let me use XDocument as I get an OutOfMemory error.

I'm using XmlReader to loop through the whole file and extract what I need. I'm including a sample XML file.

Essentially, this is what I do:

Find tag Container. If found, then retrieve attribute "ID". If "ID" begins with LOCAL, then this is what I'll be reading. Reader loop until I find tag Family with value CELL_FD When found, loop the reader.read() until I find tag IMPORTANT_VALUE. Once found, read value of IMPORTANT_VALUE. I'm done with this container, so continue looping until I find the next Container (that's where the break comes in).

This is the simplified version of how I've been reading the file and finding the relevant values.

And this is the XML:

How can I break from the most inner loop so that I can reach the top-most loop?

最满意答案

使用单独的方法应该可以更容易地控制循环：

while (myReader.Read()) { if ((myReader.Name == "CONTAINER")) { ProcessContainerElement(myReader); } }

在ProcessContainerElement方法中，您可以在确定需要开始查找下一个CONTAINER元素时返回。

private void ProcessContainerElement(XmlReader myReader) { while (whatever) { if ((myReader.Name == "IMPORTANT_VALUE")) { myReader.Read(); string Counter = myReader.Value; Console.WriteLine(Attribute + " (found: " + Counter + ")"); return; } } }

Using svick's comment, I ended up combining LINQ to XML. Once I reached the correct element and checked that the attribute had the correct ID, I dumped it to XElement.Load.

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