Linq到xml更新通過xelement

Question

我有一個xml文檔，我想用linq到xml來更新totalGrade到列表中的值。有任何想法嗎？

<?xml version="1.0" encoding="utf-8"?> 
<EmpFinanceList> 
    <EmployeeFinance> 
    <EmpEmployId>122</EmpEmployId> 
    <EmpPersonalId>23000</EmpPersonalId> 
    <dateofApp>2011-10-31T00:00:00</dateofApp> 
    <dateofEmpl>2013-02-15T00:00:00</dateofEmpl> 
    <dateofTerm /> 
    <grade_id>73</grade_id> 
    <position_id>2065</position_id> 
    <startDate>2013-02-14T00:00:00</startDate> 
    <endDate>2013-02-21T00:00:00</endDate> 
    <Exchange_rate>200</Exchange_rate> 
    <housing>45000</housing> 
    <base_pay>150000</base_pay> 
    <totalGrade>0</totalGrade> 
    <toalPosition>0</toalPosition> 
    </EmployeeFinance> 

EDITED -------------

這是我建立了我的XML文件，請告訴我，如果我錯了，做些什麼

private static void getEmployeeForEmpFinance(List<BasicPay> EmployeeEmployList) 
     { 
      var employeeFinance = new List<BasicPay>(); 
      var context = new SSPModel.sspEntities(); 
      for (int i = 0; i < EmployeeEmployList.Count; i++) 
      { 
        int empID = EmployeeEmployList.ElementAt(i).employee_personal_id; 
        //var dateOfTermination = EmployeeEmployList.ElementAt(i).dateofTerm; 
        // Debug.WriteLine(dateOfTermination); 
        var query = from c in context.Employee_Financial 
           where c.Employee_Personal_InfoEmp_id == empID 
           //orderby c.Employee_Personal_InfoEmp_id ascending 
           select new BasicPay 
           { 
            base_pay= c.Base_Pay, 
            housing= c.Housing_Allowance, 
            Base_pay_currency = c.Base_Pay_Currency 
           }; 
        var empfinance = query.ToList(); 
        foreach (var x in empfinance) 
        { 
         EmployeeEmployList.ElementAt(i).housing = x.housing; 
         EmployeeEmployList.ElementAt(i).base_pay = x.base_pay; 
        }          
      } 

      try 
      { 
          var xEle = new XElement("EmpFinanceList", 
          from emp in EmployeeEmployList 
          select new XElement("EmployeeFinance", 
             new XElement("EmpEmployId", emp.emp_employID), 
              new XElement("EmpPersonalId", emp.employee_personal_id), 
              new XElement("dateofApp", emp.dateofApp), 
              new XElement("dateofEmpl", emp.dateofEmpl), 
              new XElement("dateofTerm", emp.dateofTerm), 
              new XElement("grade_id", emp.grade_id), 
              new XElement("position_id", emp.position_id), 
              new XElement("startDate", emp.startDate), 
              new XElement("endDate", emp.endDate), 
              new XElement("Exchange_rate", emp.Exchange_rate), 
              new XElement("housing", emp.housing), 
              new XElement("base_pay", emp.base_pay), 
              new XElement("totalGrade", 0), 
              new XElement("toalPosition",0) 
             )); 
       string path1 = AppDomain.CurrentDomain.GetData("DataDirectory").ToString(); 
       string un = "\\"+GlobalClass.GlobalVar + "empFinance.xml"; 
       GlobalClass.GlobalUrl = path1 + un; 
       xEle.Save(GlobalClass.GlobalUrl); 
       Debug.WriteLine("Converted to XML " + GlobalClass.GlobalUrl); 
      } 
      catch (Exception ex) 
      { 
       Debug.WriteLine(ex.Message); 
      } 
      getFromAllBenGrade(); 
      //getFromAllBenGrade(EmployeeEmployList); 
     } 
     public static void getFromAllBenGrade() 
     { 
      var totalGrade = new List<BasicPay>(); 
      var context = new SSPModel.sspEntities(); 
      XElement xelement = XElement.Load(GlobalClass.GlobalUrl); 

      var query = from nm in xelement.Elements("EmployeeFinance") 
         select new BasicPay 
         { 
          employee_personal_id = (int)nm.Element("EmpPersonalId"), 
          grade_id = (int)nm.Element("grade_id"), 
          totalGrade = (int)nm.Element("totalGrade") 
         }; 
      var x = query.ToList(); 

      Debug.WriteLine("Taken from xml:"); 
      foreach (var xEle in x) 
      { 
       var query1 = from ee in context.Employee_Employ 
          join abg in context.All_Inc_Ben_Grade 
          on ee.Grade_Id equals abg.GradeID 
          join abl in context.All_Inc_Ben_Listing 
          on abg.All_Inc_Ben_ListingID equals abl.ID 
          where ee.Employee_Personal_InfoEmp_id == xEle.employee_personal_id && abl.Part_of_basic == "Y" && abl.Status == "A" 
          select new BasicPay 
          { 
           all_ben_listID = abl.ID, 
           amount = abl.Amount 

          }; 
       var y = query1.ToList(); 
       int? calculation; 
       int? total = 0; 
       foreach (var xyz in y) 
       { 
        calculation = xyz.amount; 
        total = total + calculation; 

       } 
       xEle.totalGrade = total; 
       // totalGrade.Add(xEle); 

       //var doc = XDocument.Load(GlobalClass.GlobalUrl); 
       //var hhhh = doc.Root.Element("EmployeeFinance") 
       //     .SetElementValue("totalGrade", total); 

      } 


      for (int i = 0; i < totalGrade.Count(); i++) 
      { 
       Debug.WriteLine(totalGrade.ElementAt(i).employee_personal_id); 
       xelement.Elements("EmployeeFinance").Where(d => int.Parse(d.Attribute("EmpPersonalId").Value) == totalGrade.ElementAt(i).employee_personal_id).SingleOrDefault().SetAttributeValue("totalGrade", totalGrade.ElementAt(i).totalGrade); 
      } 

     } 

Answer 1

XDocument doc = XDocument.Load(path); 
     var result = from element in doc.Descendants("EmployeeFinance") 
        select element; 
     foreach (var ele in result) 
     { 
      ele.SetElementValue("totalGrade", newvalue); 

     } 
     doc.Save(path); 

1. 加載文檔
2. 選擇結果
3. 循環每一個XML塊（如果您有多個記錄）
4. 設置新值
5. 保存XML文檔

Answer 2

首先，你要加載的文件：

var doc = XDocument.Load(filePath); 

之後，你就可以改變<totalGrade>元素值：

doc.Root.Element("EmployeeFinance") 
     .SetElementValue("totalGrade", newValue); 

UPDATE

如果你想在生成的XML更改了該行以設置值：

       new XElement("totalGrade", 0), 

改變0到你的列表項屬性/字段：

       new XElement("totalGrade", emp.totalGrade),