抓取子元素的xml子元素答案

【问题标题】：grab xml child of child element抓取子元素的xml子元素
【发布时间】：2017-10-22 12:28:21
【问题描述】：

我已成功访问项目集合下的 itemId、galleryURL、标题、viewItemURL 值，但问题是我需要访问另一个值，该值不直接位于项目集合下，它位于另一个子项中。请查看这张 XML 的图片以获得更好的想法。请告诉我如何访问listingInfo->watchCount

public ActionResult Search(string OperationName, string calltype, string page, string keywords, string type, string location, string condition, string min, string max, string negative, string minFeedback, string maxFeedback, string drange, string categoryId)
{
    string AppId = "demo-key"; //api configs
    string BaseUrl = "http://svcs.ebay.com/services/search/FindingService/v1?OPERATION-NAME="; //base url api end point

    if (calltype == "categoryClick")
    {
        string Url = BaseUrl + OperationName + "&SERVICE-VERSION=1.0.0&SECURITY-APPNAME=" + AppId + "&RESPONSE-DATA-FORMAT=XML&REST-PAYLOAD&categoryId=" + categoryId + "&paginationInput.entriesPerPage=2&paginationInput.pageNumber=" + page + "";

        var items = new List<EbayDataViewModel>();

        XDocument xdoc = XDocument.Load(Url);

        // Since i am only interested in <item> collections within <searchResult>
        var searchResultItems = xdoc.Descendants()
            .Where(x => x.Name.LocalName == "item");

        foreach (var sri in searchResultItems)
        {
            // Get all child xml elements
            var childElements = sri.Elements();

            var itemId = childElements.FirstOrDefault(x => x.Name.LocalName == "itemId");
            var imageurl = childElements.FirstOrDefault(x => x.Name.LocalName == "galleryURL");
            var title = childElements.FirstOrDefault(x => x.Name.LocalName == "title");
            var url = childElements.FirstOrDefault(x => x.Name.LocalName == "viewItemURL");
           // var numberofwatch = childElements.Where(x => x.Name.LocalName == "listinginfo"); this is one step inside of another element

            //add items from xml data to EbayDataViewModel object
            items.Add(new EbayDataViewModel
            {
                ItemId = itemId == null ? String.Empty : itemId.Value,
                EbayImageUrl = imageurl == null ? String.Empty : imageurl.Value,
                EbayTitle = title == null ? String.Empty : title.Value,
                EbayUrl = url == null ? String.Empty : url.Value,
                //NumberOfWatch = numberofwatch == null ? String.Empty : numberofwatch.Value,
            });
        }
        var e = Json(items);
        return Json(items);

    }else{

    }

    return null;
}

【问题讨论】：

标签： c# asp.net-mvc

【解决方案1】：

您可以使用 XPathSelectElement（请参阅MSDN XPathSelectElement）

string str =
@"<?xml version=""1.0""?>
<sri>
    <item><listingInfo><watchCount>1</watchCount></listingInfo></item>
    <item><listingInfo><watchCount>2</watchCount></listingInfo></item>
</sri>";

XDocument xdoc = XDocument.Parse(str);
var searchResultItems = xdoc.Descendants().Where(x => x.Name.LocalName == "item");
foreach (var item in searchResultItems)
{
    var wc = item.XPathSelectElement("listingInfo/watchCount");
    Console.WriteLine(wc.Value);
}

【讨论】：

【解决方案2】：

我认为这行代码解决了你的问题

var nofwatch = childElements.FirstOrDefault(x => x.Name.LocalName == "listingInfo").Elements().FirstOrDefault(x => x.Name.LocalName == "watchCount");

foreach (var sri in searchResultItems)
                {
                    // Get all child xml elements
                    var childElements = sri.Elements();

                    var itemId = childElements.FirstOrDefault(x => x.Name.LocalName == "itemId");
                    var imageurl = childElements.FirstOrDefault(x => x.Name.LocalName == "galleryURL");
                    var title = childElements.FirstOrDefault(x => x.Name.LocalName == "title");
                    var url = childElements.FirstOrDefault(x => x.Name.LocalName == "viewItemURL");
                    var nofwatch = childElements.FirstOrDefault(x => x.Name.LocalName == "listingInfo").Elements().FirstOrDefault(x => x.Name.LocalName == "watchCount");

                    //add items from xml data to EbayDataViewModel object
                    items.Add(new EbayDataViewModel
                    {
                        ItemId = itemId == null ? String.Empty : itemId.Value,
                        EbayImageUrl = imageurl == null ? String.Empty : imageurl.Value,
                        EbayTitle = title == null ? String.Empty : title.Value,
                        EbayUrl = url == null ? String.Empty : url.Value,
                        NumberOfWatch = nofwatch == null ? String.Empty : nofwatch.Value,
                    });
                }

【讨论】：