C# 将子节点附加到空节点列表。（内存不足异常）

我有一个类似于以下内容的xml：

<root>
   <car name="Honda">
    <part name="part1" />
    <part name="part2" />
    <part name="part3" />
   </car>
   <car name="Ford" />
   <car name="Subaru" />
   <car name="VW" />
   <car name="Chevy">
    <part name="part5" />
    <part name="part6" />
    <part name="part7" />
   </car>
   <car name="BMW" />
</root>

现在，在我的实际数据文件中，我有大约600个空节点，我想在其中附加10个子节点

我不应该因此而出现内存不足的异常

---

如何解决此错误？

您的listcars有一个问题，因为它不会提供确切的空车。 试试这段代码，它正在工作

using (StreamReader sr = new StreamReader(@"C:\myfile.xml", true))
        {
            XDocument xDoc = XDocument.Load(sr);

            var allCars = xDoc.Root.Elements();

            var carToUse = allCars.Where(x => x.Attribute("name").Value == "Honda").FirstOrDefault();
            var listCars = carToUse.Descendants("part").ToList();

            var fullCars = allCars.Where(x => x.Descendants("part").Any()).ToList();
            var emptyPermissions = allCars.Where(x => x.Descendants("part").Any() == false).ToList();

            foreach (var perm in emptyPermissions)
            {
                perm.Add(listCars);
            }
        }

---

与Ankit的答案几乎相同：

    private void DoIt()
    {
        using (StreamReader sr = new StreamReader(@"M:\StackOverflowQuestionsAndAnswers\XMLStuff_42582050\XMLStuff_42582050\sample.xml", true))
        {
            XDocument xDoc = XDocument.Load(sr);//load your xml
            var allCars = xDoc.Root.Elements("car");//get a list of all the cars
            var carToUse = allCars.Where(x => x.Attribute("name").Value == "Honda").FirstOrDefault();//pick the one car to use
            var hondaParts = carToUse.Descendants("part");//get the parts of the car to use
            var carswithNoparts = allCars.Where(x => x.HasElements == false).ToList();//get all the cars with no parts
            foreach (var car in carswithNoparts)//iterate through the cars with no parts
            {
                car.Add(hondaParts);//add the honda parts
            }
            xDoc.Save(@"M:\StackOverflowQuestionsAndAnswers\XMLStuff_42582050\XMLStuff_42582050\out.xml");//save output
        }
    }

---

xDoc.substands（“root”）.substands（）

表示所有子体（包括部分）都是

xDoc.substands（“root”）.Elements（）

。我不知道这是否能解决任何问题，但首先要解决你的代码。您的

listCars

变量与示例一起也是空的。。。提问前调试这与我在评论中所说的完全相同。@Ankit基本相同，尽管我列出的没有零件的汽车略有不同

var carswithNoparts=allCars.Where（x=>x.HasElements==false.ToList（），一些变量名更能代表它们所承载的内容。英雄所见略同！
    private void DoIt()
    {
        using (StreamReader sr = new StreamReader(@"M:\StackOverflowQuestionsAndAnswers\XMLStuff_42582050\XMLStuff_42582050\sample.xml", true))
        {
            XDocument xDoc = XDocument.Load(sr);//load your xml
            var allCars = xDoc.Root.Elements("car");//get a list of all the cars
            var carToUse = allCars.Where(x => x.Attribute("name").Value == "Honda").FirstOrDefault();//pick the one car to use
            var hondaParts = carToUse.Descendants("part");//get the parts of the car to use
            var carswithNoparts = allCars.Where(x => x.HasElements == false).ToList();//get all the cars with no parts
            foreach (var car in carswithNoparts)//iterate through the cars with no parts
            {
                car.Add(hondaParts);//add the honda parts
            }
            xDoc.Save(@"M:\StackOverflowQuestionsAndAnswers\XMLStuff_42582050\XMLStuff_42582050\out.xml");//save output
        }
    }