根据条件LINQ TO XML C＃选择元素

Question

I am querying XML using LINQ TO XML. I want to query records based on some conditional check here is my XML below: XML will have multiple Orders each order will be in I want to select order which has param node attribute store value is not null and if exists should be 1 and also order with carton information...

    <orders>
        <order>
            <criteria>
                <param name="location">123</param>
                <param name="name">Chicago</param>
                <param name="Store">1</param>
                <param name="Account Number">1212121212</param>
            </criteria>
            <items>
                <item> </item>
                <item> </item>           
            </items>
            <cartons>
                <carton>
                     <size> </size>
                     <weight></weight>
                </carton>
            </cartons>
        </order>
    <Order>
    </Order>
    </orders>

I am able to do till this:

var result = from item in doc.Descendants("order")
                where item.Element("criteria").Element("param").Attribute("name").Value.Contains("store") == true
                && item.Element("cartons") != null
                select item;"

Above works fine if my store (param) attribute is first in the filter node but if I move the store(param) to other position than first it does not filter it

Answer 1

The problem is that you're only looking at one param element - always the first one, because that's what the Element does.

You want to match if any of the parameters is a "Store" element with a value of 1, so you want to use the Any method and use Elements to find all the parameters:

var query = from item in doc.Descendants("order")
            where item.Element("criteria").Elements("param")
                      .Any(p => p.Attribute("name").Value == "Store" &&
                                (int) p == 1)
                  && item.Element("cartons") != null
            select item;

The query expression isn't really helping you here - I'd use:

var query = doc.Descendants("order")
               .Where(item => item.Element("criteria").Elements("param")
                                  .Any(p => p.Attribute("name").Value == "Store" &&
                                            (int) p == 1)
                              && item.Element("cartons") != null);