Question

这是我的XML结构

<?xml version="1.0" encoding="utf-8"?>
<Projects xmlns="urn:projects-schema">
    <Project>
        <Name>Project1</Name>
        <Images>
            <Image Path="D:/abc.jpg"></Image>
        </Images>
    </Project>       
</Projects>

我希望能够通过我的代码添加新的项目节点
我希望能够在给定项目名称

到目前为止我的第一项任务是：

try
{
    var filename = Server.MapPath("~/App_Data/Projects.xml");
    var doc = new XmlDocument();

    if (System.IO.File.Exists(filename))
    {
        if (!ProjectExists(projectName))
        {
            doc.Load(filename);
            var root = doc.DocumentElement;
            var newElement = doc.CreateElement("Project");
            root.AppendChild(newElement);

            root = doc.DocumentElement;
            newElement = doc.CreateElement("Name");
            var textNode = doc.CreateTextNode(projectName);

            root.LastChild.AppendChild(newElement);
            root.LastChild.LastChild.AppendChild(textNode);

            doc.Save(filename);
        }
        else
            throw new ApplicationException("Project already exists");
        doc = null;
    }
}
catch (Exception ex)
{
    throw ex;
}

但我正在努力争取第二部分。这就是我到目前为止所做的：

if (System.IO.File.Exists(projectFilename))
{
    doc.Load(projectFilename);
    XmlNode root = doc.DocumentElement;

    XmlNamespaceManager nsManager = new XmlNamespaceManager(doc.NameTable);
    nsManager.AddNamespace("prj", "urn:projects-schema");

    root = root.SelectSingleNode("descendant::prj:Project[prj:Name='" + projectName + "']", nsManager);
}

任何帮助将不胜感激。感谢

Answer 1

XElement projects = XElement.Parse (
@"<Projects xmlns='urn:projects-schema'>
    <Project>
        <Name>Project1</Name>
        <Images>
            <Image Path='D:/abc.jpg'></Image>
        </Images>
    </Project>       
</Projects>");

对于任务1，可以按如下方式完成：

projects.LastNode.AddAfterSelf(new XElement("Project", 
                                 new XElement("Name", "Project2"),
                                 new XElement("Images",
                                    new XElement("Image", "", new XAttribute("Path", "C:/abc.jpg"))
                                 )));

任务2：

projects.Descendants("Name")
    .Where(x => x.Value == projectName).FirstOrDefault()
    .AddAfterSelf(new XElement("Images",
                       new XElement("Image", "", new XAttribute("Path", "C:/def.jpg"))
                    )
                );

编辑：检查是否存在Images元素并添加带有属性的子Image元素

projects.Descendants("Project")
    .Where(x => x.Elements("Images").Any())
    .Descendants("Images").FirstOrDefault()
    .Add(new XElement("Image", "", new XAttribute("Path", "D:/xyz.jpg")));

在特定节点下添加XMLNode

1 个答案: