C＃通過XElement從XML文件中讀取取決於值的內容

Question

我必須在C＃中讀出所有依賴於用戶名的設置（參數：'name'和'visible'），並按照'name'的順序將其存儲到列表中然後「可見」等。

所以列表的內容應該是（在客戶端的用戶名：「服務」）：

Name-of-Service-Setting-1 
True1S 
Name-of-Service-Setting-2 
True2S 
Name-of-Service-Setting-3 
True3S 

但我只得到了第一個孩子（在客戶端的用戶名：「服務」）：

Name-of-Service-Setting-1 
True1S 

這裏是我的C＃-code：

using System; 
using System.Collections.Generic; 
using System.Linq; 
using System.Xml; 
using System.Xml.Linq; 
using System.Reflection; 

namespace LinqToXML_Example 
{ 
    public class Program 
    { 
     public static bool IsUsernameExisting(string username, XElement clients) 
     { 
      var userName = from p in clients.Elements() 
          where p.Element("Username").Value == username 
          select p.Element("Username").Value; 

      foreach (var p in userName) 
      { 
       return true; 
      } 

      return false; 
     } 



     public static List<string> ReadUserSettings(string username, XElement clients) 
     { 

      List<string> settingsList = new List<string>(); 


      if (IsUsernameExisting(username, clients)) 
      { 
       var setting = from s in clients.Elements() 
           where s.Element("Username").Value == username 
           select s.Element("Settings"); 

       foreach (var p in setting) 
       { 
        settingsList.Add(p.Element("Setting").Element("Name").Value); 
        settingsList.Add(p.Element("Setting").Element("Visible").Value); 
       } 

       return settingsList; 
      } 


      var errorMsg = "Cannot get the username's settings, because of a wrong Username!"; 
      settingsList.Add(errorMsg); 

      return settingsList; 
     } 





     public static void Query(string username, XElement clients) 
     { 
      // Readout the Settings of Client: 
      Console.WriteLine("Readout all the settings of client " + "'" + username + "':"); 

      List<string> resultList1 = new List<string>(); 
      resultList1 = ReadUserSettings(username, clients); 

      if (resultList1.Count != 1) 
      { 
       for (int i = 0; i < resultList1.Count(); i++) 
       { 
        Console.WriteLine(resultList1.ElementAt(i)); 
       } 
      } 

      else Console.WriteLine(resultList1.ElementAt(0)); 


      Console.WriteLine("\n- - - - - End-Of-File- - - - - "); 
      Console.Read(); 
     } 




     static void Main() 
     { 

      var asm = Assembly.GetExecutingAssembly(); 
      var textStream = asm.GetManifestResourceStream("LinqToXML_Example.AccessData.xml"); 
      var xmlReader = new XmlTextReader(textStream); 

      XElement clients = XElement.Load(xmlReader); 


      Query("Service", clients); 
     } 
    } 
} 

這是我AccessData.xml文件：

<Client> 

    <Username>Administrator</Username> 

    <Password>Admin-Password</Password> 

    <Settings> 

    <Setting> 
     <Name>Name-of-Admin-Setting-1</Name> 
     <Visible>True1A</Visible> 
    </Setting> 

    <Setting> 
     <Name>Name-of-Admin-Setting-2</Name> 
     <Visible>True2A</Visible> 
    </Setting> 

    <Setting> 
     <Name>Name-of-Admin-Setting-3</Name> 
     <Visible>True3A</Visible> 
    </Setting> 

    </Settings> 

</Client> 



<Client> 

    <Username>Service</Username> 

    <Password>Service-Password</Password> 

    <Settings> 

    <Setting> 
     <Name>Name-of-Service-Setting-1</Name> 
     <Visible>True1S</Visible> 
    </Setting> 

    <Setting> 
     <Name>Name-of-Service-Setting-2</Name> 
     <Visible>True2S</Visible> 
    </Setting> 

    <Setting> 
     <Name>Name-of-Service-Setting-3</Name> 
     <Visible>True3S</Visible> 
    </Setting> 

    </Settings> 

</Client> 



<Client> 

    <Username>Customer</Username> 

    <Password>Customer-Password</Password> 

    <Settings> 

    <Setting> 
     <Name>Name-of-Customer-Setting-1</Name> 
     <Visible>True1C</Visible> 
    </Setting> 

    <Setting> 
     <Name>Name-of-Customer-Setting-2</Name> 
     <Visible>True2C</Visible> 
    </Setting> 

    <Setting> 
     <Name>Name-of-Customer-Setting-3</Name> 
     <Visible>True3C</Visible> 
    </Setting> 

    </Settings> 

</Client> 

Answer 1

更改此foreach循環：

foreach (var p in setting) 
{ 
    settingsList.Add(p.Element("Setting").Element("Name").Value); 
    settingsList.Add(p.Element("Setting").Element("Visible").Value); 
} 

要：

foreach (var p in setting.Elements("Setting")) 
{ 
    settingsList.Add(p.Element("Name").Value); 
    settingsList.Add(p.Element("Visible").Value); 
} 

只有一個Settings下的每個Client。所以一週時間運行的迴路元件和你正在使用p.Element("Setting")的第一個項目，而應該遍歷Settings。還有的子元素，而不是List<string>你可能要考慮使用Dictionary。