我有以下工作代码，用于从XML字符串输入创建特定格式的XML文件。
var dc = XElement.Parse(InputXml);
var cd = ContextDate.ToString("yyyyMMdd");
var xc = XNamespace.Get("XmlCache");
var mp = XNamespace.Get("mx.MarketParameters");
var fx = XNamespace.Get("mx.MarketParameters.Forex");
var fxsp = XNamespace.Get("mx.MarketParameters.Forex.Spot");
var xdoc = new XDocument(
new XDeclaration("1.0", "utf-8", "no"),
new XElement(xc + "XmlCache", new XAttribute(XNamespace.Xmlns + "xc", xc),
new XAttribute(XNamespace.Xmlns + "mp", mp),
new XAttribute(XNamespace.Xmlns + "fx", fx),
new XAttribute(XNamespace.Xmlns + "fxsp", fxsp),
new XAttribute(xc + "action", "Update"),
new XElement(xc + "XmlCacheArea", new XAttribute(xc + "value", "MarketParameters"),
new XElement(mp + "nickName", new XAttribute(XNamespace.Xmlns + "mp", mp),
new XAttribute(xc + "value", MpNickName),
new XElement(mp + "date",
new XAttribute(xc + "value", cd),
new XElement(fx + "forex", new XAttribute(XNamespace.Xmlns + "fx", fx),
new XElement(fxsp + "spot",
new XAttribute(XNamespace.Xmlns + "fxsp", fxsp),
from myRow in dc.Elements("row").AsEnumerable()
group myRow by new { ccy = myRow.GetElementValue("Ccy") }
into myGroup
select
new XElement(fxsp + "pair",
new XAttribute(xc + "value", myGroup.Key.ccy),
from myRow in myGroup
select
new XElement(fxsp + "pair",
new XAttribute(xc + "value", myRow.GetElementValue("Identifier")),
new XAttribute(xc + "type", "Fields"),
new XElement(mp + "ask", new XAttribute(xc + "keyFormat", "N"), myRow.GetElementValue("Value")),
new XElement(mp + "bid", new XAttribute(xc + "keyFormat", "N"), myRow.GetElementValue("Value")),
new XElement(mp + "mid", new XAttribute(xc + "keyFormat", "N"), myRow.GetElementValue("Value")),
new XElement(mp + "quotation", new XAttribute(xc + "keyFormat", "C"),
myRow.GetElementValue("Identifier")))))))))));
但现在我需要在表上进行自联接以将2行组合为1.该表包含2个不同的ProductTypes，需要由Identifier列连接。 所以我使用myRow作为类型A，使用shiftRow作为类型B. 我需要将两列Value列的值放在一行中。为了克服我读到的含糊不清的列名，我需要使用如此处所述的join LINQ to SQL: How to handle ambiguous column names when joining tables? 但我不能使用选择新{t1A = t1.ColumnA，t2A = t2.ColumnA，t3A = t3.ColumnA}＆＃39;正如我在LINQ to XML中所建议的那样。 我在下面尝试了但是它没有使用注释行进行编译而没有注释。
xdoc = new XDocument(
new XDeclaration("1.0", "utf-8", "no"),
new XElement(xc + "XmlCache", new XAttribute(XNamespace.Xmlns + "xc", xc),
new XAttribute(XNamespace.Xmlns + "mp", mp),
new XAttribute(XNamespace.Xmlns + "fx", fx),
new XAttribute(XNamespace.Xmlns + "fxsp", fxsp),
new XAttribute(xc + "action", "Update"),
new XElement(xc + "XmlCacheArea", new XAttribute(xc + "value", "MarketParameters"),
new XElement(mp + "nickName", new XAttribute(XNamespace.Xmlns + "mp", mp),
new XAttribute(xc + "value", MpNickName),
new XElement(mp + "date",
new XAttribute(xc + "value", cd),
new XElement(fx + "forex", new XAttribute(XNamespace.Xmlns + "fx", fx),
new XElement(fxsp + "spot",
new XAttribute(XNamespace.Xmlns + "fxsp", fxsp),
from myRow in
dc.Elements("row").AsEnumerable().Where(x => x.GetElementValue("ProductType").Equals("A"))
join shiftRow in
dc.Elements("row").AsEnumerable().Where(x => x.GetElementValue("ProductType").Equals("B")) on
myRow.GetElementValue("Identifier") equals shiftRow.GetElementValue("Identifier")
into joined
from shiftRow in joined.DefaultIfEmpty()
//new { t1A = myRow.GetElementValue("Value"), t2A = shiftRow.GetElementValue("Value") }
group myRow by new { ccy = myRow.GetElementValue("Ccy") }
into myGroup
select
new XElement(fxsp + "pair",
new XAttribute(xc + "value", myGroup.Key.ccy),
from myRow in myGroup
select
new XElement(fxsp + "pair",
new XAttribute(xc + "value", myRow.GetElementValue("Identifier")),
new XAttribute(xc + "type", "Fields"),
new XElement(mp + "ask", new XAttribute(xc + "keyFormat", "N"), myRow.GetElementValue("Value")),
new XElement(mp + "bid", new XAttribute(xc + "keyFormat", "N"), myRow.GetElementValue("Value")),
new XElement(mp + "mid", new XAttribute(xc + "keyFormat", "N"), myRow.GetElementValue("Value")),
new XElement(mp + "quotation", new XAttribute(xc + "keyFormat", "C"),
myRow.GetElementValue("Identifier")))))))))));
怎么解决？ 我需要在group into子句之后使用shiftRow的值，这使得shiftRow不再可访问。对不起冗长的代码...