检查XML中是否存在元素

Question

XML:

<CONFIGURATION>
<Files>
    <File>D:\Test\TestFolder\TestFolder1\TestFile.txt</File>
    <File>D:\Test\TestFolder\TestFolder1\TestFile01.txt</File>
    <File>D:\Test\TestFolder\TestFolder1\TestFile02.txt</File>
    <File>D:\Test\TestFolder\TestFolder1\TestFile03.txt</File>
    <File>D:\Test\TestFolder\TestFolder1\TestFile04.txt</File>
</Files>
<SizeMB>3</SizeMB>
<BackupLocation>D:\Log backups\File backups</BackupLocation>
</CONFIGURATION>

码:

private void btnLinq_Click(object sender, EventArgs e)
    {
        queryData(@"D:\WatchMe1\backupconfig1.xml");
    }

static void queryData(string xmlFile)
    {
        var xdoc = XDocument.Load(xmlFile);
        var configuration = xdoc.Element("CONFIGURATION");
        string sizeMB = configuration.Element("SizeMB").Value;
        string backupLocation = configuration.Element("BackupLocation").Value;
        //need a code here to check if element <File> exist before executing the file array
        string[] files = configuration.Element("Files").Elements("File").Select(c => c.Value).ToArray();

        foreach (string file in files)
        {
            Console.WriteLine(file);
        }
    }

我有一个xml编写器程序,编辑上面的xml.Files元素可以更改为Folder元素.我有另一个程序读取值(文件位置)并用它做一些事情,我必须首先检查元素是文件或文件夹元素.

Answer 1

你可以用类似的东西来检查元素是否存在

if(configuration.Elements("...").Any()){...}

但我不确定你在这里问的是什么......