[英]Loop through two XElements based on Condition
我想循环一个XML树并测试两个条件,并发现了一些问题。
我的XML文件:(用于蛋白质)
<?xml version="1.0" encoding="utf-8"?>
<ProteinStructure>
<SecondaryStructure>
<StName>HELX_P1</StName>
<StType>alphaHelix</StType>
<AmAcidStart>1</AmAcidStart>
<AmAcidEnd>2</AmAcidEnd>
</SecondaryStructure>
<SecondaryStructure>
<StName>HELX_P2</StName>
<StType>alphaHelix</StType>
<AmAcidStart>43</AmAcidStart>
<AmAcidEnd>53</AmAcidEnd>
</SecondaryStructure>
我的XML文件:(用于atom)
<?xml version="1.0" encoding="utf-8"?>
<Molecule>
<Atom>
<AtNum>1</AtNum>
<AmAcSeq>2</AmAcSeq>
<AtType>N</AtType>
<StType>turn</StType>
</Atom>
<Atom>
<AtNum>2</AtNum>
<AmAcSeq>2</AmAcSeq>
<AtType>CA</AtType>
<StType>turn</StType>
</Atom>
<Atom>
<AtNum>2</AtNum>
<AmAcSeq>2</AmAcSeq>
<AtType>C</AtType>
<StType>turn</StType>
</Atom>
<Atom>
<AtNum>1</AtNum>
<AmAcSeq>3</AmAcSeq>
<AtType>N</AtType>
<StType>turn</StType>
</Atom>
到目前为止,我的代码:
XDocument atom = XDocument.Load (@"C:\\Users\\RuiGarcia\\Documents\\MIB\\INESC\\C#Tutorial\\ProjectC#\\Molecule_00\\PDBLibary_00\\Data\\__3Q26.xml"); XDocument protein = XDocument.Load (@"C:\\Users\\RuiGarcia\\Documents\\MIB\\INESC\\C#Tutorial\\ProjectC#\\Molecule_00\\PDBLibary_00\\Data\\_3Q26.xml"); //Change secondary structure tag type "turn" to helixAlpha or betaSheet foreach (XElement amAc in protein.Descendants ("SecondaryStructure")) { atom.Element ("Molecule") .Elements ("Atom") .Where (x => (int?)x.Element("AmAcSeq") >= (int?)amAc.Element("AmAcidStart") && x => (int?)ToInt16.x.Element ("AmAcSeq") <= (int?)amAc.Element("AmAcidEnd")) .Select (x => x.Element("StType")).FirstOrDefault().SetValue(amAc.Element("StType")); // Console.WriteLine (amAc.Element("AmAcidStart").Value); // .Where (x => Convert.ToInt16(x.Element("AmAcSeq").Value) <= Convert.ToInt16(amAc.Element("AmAcidStart").Value) && x => Convert.ToInt16(x.Element ("AmAcSeq").Value) >= Convert.ToInt16(amAc.Element("AmAcidStart"))) // .Where (x => (int?)x.Element("AmAcSeq") >= (int?)amAc.Element("AmAcidStart") && x => (int?)ToInt16.x.Element ("AmAcSeq") <= (int?)amAc.Element("AmAcidStart")) } atom.Save(@"C:\\Users\\RuiGarcia\\Documents\\MIB\\INESC\\C#Tutorial\\ProjectC#\\Molecule_00\\PDBLibary_00\\Data\\__3Q26.xml");
PS-如何正确格式化代码而不在代码示例中将其分开?
提前致谢。
您需要第二个foreach
来遍历结果。 我提出了一些价值观,并在下面举例说明了这一点。
XDocument atom = XDocument.Load (@"...\__3Q26.xml");
XDocument protein = XDocument.Load (@"...\_3Q26.xml");
//Change secondary structure tag type "turn" to helixAlpha or betaSheet
foreach (XElement amAc in protein.Descendants ("SecondaryStructure"))
{
int? start = (int?)amAc.Element("AmAcidStart");
int? end = (int?)amAc.Element("AmAcidEnd");
string stType = (string)amAc.Element("StType");
IEnumerable<XElement> atoms = atom.Element("Molecule").Elements("Atom");
// Here we are iterating again in each matching result
foreach (XElement atomElement in atoms.Where(elem => (int?)elem.Element("AmAcSeq") >= start && (int?)elem.Element("AmAcSeq") <= end))
{
atomElement.SetValue(stType);
}
}
我在这里看到几个问题:
foreach
循环,而不是FirstOrDefault()
。 (int?)ToInt16.x.Element ("AmAcSeq") <= (int?)amAc.Element("AmAcidStart")
甚至都不会编译,并且几乎应该像(int?)x.Element ("AmAcSeq") <= (int?)amAc.Element("AmAcidEnd"))
从而:
foreach (XElement secondaryStructure in protein.Descendants ("SecondaryStructure"))
{
foreach (var atomStType in atom.Element ("Molecule")
.Elements ("Atom")
.Where(a => (int?)a.Element("AmAcSeq") >= (int?)secondaryStructure.Element("AmAcidStart") && (int?)a.Element("AmAcSeq") <= (int?)secondaryStructure.Element("AmAcidEnd"))
.Select (a => a.Element("StType")))
{
atomStType.SetValue((string)secondaryStructure.Element("StType"));
}
}
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