匹配并选择XML元素并替换兄弟元素的值

时间:2013-03-20 16:01:14

标签: c# linq-to-xml

我有一个XML文档(参见下面的摘录),我有一个方法,我传递3个字符串参数 - 用户名,文件名和状态。我需要程序查看XML文档,将文件名与文件的DMC元素匹配,然后将status和currentUser元素值更改为我传递给my方法的userName和status值。

<dataModule>
    <DMC>DMC-PO-A-49-00-00-00A-012A-C_001.SGM</DMC>
    <techName>Pneumatic and shaft power gas turbine engine</techName>
    <infoName>General warnings and cautions and related safety data</infoName>
    <status>Checked In</status>
    <notes>-</notes>
    <currentUser>-</currentUser>
</dataModule>
<dataModule>
    <DMC>DMC-PO-A-49-00-00-00A-00VA-C_001.SGM</DMC>
    <techName>Pneumatic and shaft power gas turbine engine</techName>
    <infoName>List of Applicable Specifications and Documentation</infoName>
    <status>Checked In</status>
    <notes>-</notes>
    <currentUser>-</currentUser>
</dataModule>
<dataModule>
    <DMC>DMC-PO-A-49-00-00-00A-001A-C_001.SGM</DMC>
    <techName>Pneumatic and shaft power gas turbine engine</techName>
    <infoName>Title page</infoName>
    <status>Checked In</status>
    <notes>-</notes>
    <currentUser>-</currentUser>
</dataModule>

目前我有以下代码。我希望这能说明我正在努力实现的目标。这是一个WinForms项目,我想用Linq做这个。

public static void updateStatus(string user, string file, string status)
{
    XDocument doc = XDocument.Load(Form1.CSDBpath + Form1.projectName + "\\Data.xml");

    var el = from item in doc.Descendants("dataModule")
             where item.Descendants("DMC").First().Value == file
             select item;

    var stat = el.Descendants("status");

    // code here to change the value of the 'status' element text

    var newUser = el.Descendants("currentUser");

    // code here to change the value of the 'currentUser' element text

}

1 个答案:

答案 0 :(得分:0)

您的Linq查询返回IEnumerable<XElement>而不是XElement这一事实可能导致您失误。这是您可以实现目标的一种方式:

public static void updateStatus(string user, string file, string status)
{
    XDocument doc = XDocument.Load(@"C:\Projects\ConsoleApp\XMLDocument.xml");

    var els = from item in doc.Descendants("dataModule")
              where item.Descendants("DMC").First().Value == file
              select item;

    if (els.Count() > 0)
    {
        XElement el = els.First();
        el.SetElementValue("status", status);
        el.SetElementValue("currentUser", user);

        doc.Save(@"C:\Projects\ConsoleApp\XMLDocument.xml");
    }
}