Question

我正在尝试编写一个代码，用于以这种格式从.config文件中获取元素：

    <?xml version="1.0" encoding="utf-8" ?>
    <configuration>
      <configSections>
        <section name="unity" type="Microsoft.Practices.Unity.Configuration.UnityConfigurationSection, Microsoft.Practices.Unity.Configuration"/>
      </configSections>

      <unity xmlns="http://schemas.microsoft.com/practices/2010/unity">

        <alias alias="singleton" type="Microsoft.Practices.Unity.ContainerControlledLifetimeManager, Microsoft.Practices.Unity" />
        <alias alias="hierarchical" type="Microsoft.Practices.Unity.HierarchicalLifetimeManager, Microsoft.Practices.Unity" />
        <alias alias="session" type="Microsoft.Practices.Unity.SessionLifetimeManager, TelventDMS.Web.Common" />
        <alias alias="IReportService" type="Web.Common.Interfaces.IReportService, Web.Common" />
        <alias alias="ReportServiceImpl" type="Web.Common.Services.ReportServiceImpl`1, Web.Common" />
        <alias alias="TAReport" type="Web.WebClient.Areas.Reports.Services.TopologyAnalyzerServiceImpl, Web.WebClient" />
        <alias alias="TAReportJobParam" type="UI.ServiceProxies.TAReportJobParam, UI.ServiceProxies.ServiceProxies" />
        <alias alias="ViolationsReport" type="Web.WebClient.Areas.Reports.Services.ViolationsServiceImpl, Web.WebClient.TDMSWebApp" />
        <alias alias="ViolationsJobParam" type="UI.ServiceProxies.ViolationsJobParam, UI.ServiceProxies.ServiceProxies" />
        <assembly name="Web.WebClient.TDMSWebApp" />
        <container name="container">
           <register name="configService" type="Web.Common.Interfaces.IConfigService, Web.Common"
            mapTo="Web.Common.Services.ConfigServiceImpl, Web.Common">
            <lifetime type="singleton" />
            <constructor>
              <param name="res" value="Resources.ClientStrings"> </param>
              <param name="configFile" value="webclient.config"> </param>
            </constructor>
          </register>

          <register name="scaleCoefConfigService" type="Web.WebClient.Services.IScaleCoefConfigService, Web.WebClient.TDMSWebApp"
                         mapTo="Web.WebClient.Services.Implementations.ScaleCoefConfigServiceImpl, Web.WebClient.TDMSWebApp">
           <lifetime type="singleton" />
           <constructor>
              <param name="configService">
              <dependency name="configService"/>
              </param>
            </constructor>
        </register>

        <register name="sessionService" type="Web.Common.Interfaces.ISessionService, Web.Common" 
        mapTo="Web.Common.Services.SessionServiceImpl, Web.Common">
        <lifetime type="singleton" />
        </register>

        <register name="licenseManagerService" type="Web.Common.Interfaces.ILicenseManagementService, Web.Common"
                          mapTo="Web.Common.Services.LicenseManagementServiceImpl, Web.Common">
          <lifetime type="singleton" />
        </register>
      </container>
     </unity>
  </configuration>

获取寄存器后，我想将寄存器类型和mapTo的值放在单独的列表中，使用以下代码：

private void ReadAdvancedConfigFile()
 {
   XElement root = null;
   root = XElement.Load(new XmlTextReader(@"C:\Users\nemanja.mosorinski\Downloads\__Research-master\__Research-master\SEDMSVSPackage\VisualStudioPackage\AppRes\ConfigFiles\Unity.config"));

    if (root != null)
    {
      var registers = root.Element("unity").Element("container").Descendants("register");
      List<string> tipList = new List<string>();
      List<string> mapToList = new List<string>();

      if (registers.Count() > 0)
      {
        foreach (var reg in registers)
        { 
            tipList.Add(root.Attribute("type").Value); 
            mapToList.Add(root.Attribute("mapTo").Value);

        }
      }
   }
}

但是在调试过程中，我在这行代码中得到了NullReferenceException（）：

var registers = root.Element("unity").Element("container").Descendants("register");

好像.config没有一些元素。我已经多次检查.config文件结构了，我确信它必须像那样，但是我尝试的所有内容都没有用。我总是以“统一”的空值结束。

P.S。我在根变量中获得了.config文件的副本，所以这不是问题。只是因为root的元素不存在或找不到。

任何人都有一些想法或如何解决这个问题？

Answer 1

XElement root = XElement.Load(new XmlTextReader(@"C:\Users\nemanja.mosorinski\Downloads\__Research-master\__Research-master\SEDMSVSPackage\VisualStudioPackage\AppRes\ConfigFiles\Unity.config");

if(root != null)
{
    XNamespace ns = "http://schemas.microsoft.com/practices/2010/unity";

    var registers = root
        .Element(ns + "unity")
        .Element(ns + "container")
        .Descendants(ns + "register");

    var tipList = registers.Select(x => x.Attribute("type").Value);
    var mapToList = registers.Select(x => x.Attribute("mapTo").Value);
}

通过XElement访问Unity（.config）文件的元素

1 个答案: