Question

我有以下xml字符串：

<report>
    <item id="4219" Co="6063" LastName="Doe" FirstName="John"/>
    <item id="2571" Co="6063" LastName="Doe" FirstName="Jane"/>
</report>

如何将Linq写入xml查询，按名称=“Jane”过滤并将其写回xml字符串

到目前为止，我有以下代码：

XDocument reportXmlDoc = XDocument.Parse(_report); //This is the string var assigned with data above
var filteredList = from x in fullReportXmlDoc.Descendants("item")
             where x.Attribute("FirstName").Value == "Jane"
             select x;

如何将filteredList转换回xml字符串？

Answer 1

您是否尝试过使用SaveOptions.DisableFormatting来获取XElement的XML字符串？对于你的情况，它看起来像这样：

XDocument reportXmlDoc = XDocument.Parse(_report); //This is the string var assigned with data above
var elementStrings = from x in fullReportXmlDoc.Descendants("item")
    where x.Attribute("FirstName").Value == "Jane"
    select x.ToString(SaveOptions.DisableFormatting);

Answer 2

您可以从现有查询中投影新的XML树：

var filteredList =
    from x in fullReportXmlDoc.Descendants("item")
    where x.Attribute("FirstName").Value == "Jane"
    select new XElement("report", x).ToString();

或许，在更一般的情况下：

string result = new XElement("report",
    from x in fullReportXmlDoc.Descendants("item")
    where x.Attribute("FirstName").Value == "Jane"
    select x).ToString();

编写LINQ to XML查询以过滤xml字符串

2 个答案: