[英]How can I read specific elements from XML string using XMLREADER in C#
我有XML字符串:
<GroupBy Collapse=\"TRUE\" GroupLimit=\"30\">
<FieldRef Name=\"Department\" />
</GroupBy>
<OrderBy>
<FieldRef Name=\"Width\" />
</OrderBy>
我是C#的新手。 我試圖讀取兩個元素的FieldRef元素的Name屬性,但我不能。 我用過XMLElement,有沒有辦法選擇這兩個值?
盡管發布了無效的XML(沒有根節點),但是迭代<FieldRef>元素的一種簡單方法是使用XmlReader.ReadToFollowing
方法:
//Keep reading until there are no more FieldRef elements
while (reader.ReadToFollowing("FieldRef"))
{
//Extract the value of the Name attribute
string value = reader.GetAttribute("Name");
}
當然,LINQ to XML提供了一個更靈活,更流暢的界面,如果在你所針對的.NET框架中可用的話,它可能會更容易使用嗎? 代碼然后變成:
using System.Xml.Linq;
//Reference to your document
XDocument doc = {document};
/*The collection will contain the attribute values (will only work if the elements
are descendants and are not direct children of the root element*/
IEnumerable<string> names = doc.Root.Descendants("FieldRef").Select(e => e.Attribute("Name").Value);
試試這個:
string xml = "<GroupBy Collapse=\"TRUE\" GroupLimit=\"30\"><FieldRef Name=\"Department\" /></GroupBy><OrderBy> <FieldRef Name=\"Width\" /></OrderBy>";
xml = "<root>" + xml + "</root>";
XmlDocument doc = new XmlDocument();
doc.LoadXml(xml);
foreach (XmlNode node in doc.GetElementsByTagName("FieldRef"))
Console.WriteLine(node.Attributes["Name"].Value);
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