如何額外的過濾器添加到該XML

Question

我有下面的C＃代碼解析XML文檔：

XDocument.Load(ConfigurationManager.AppSettings["XDocumentLoad"]) 
    .Root 
    .Elements(j + "RegisteredOffenders") 
    .ToList() 
    .ForEach(element => 
    { 
     //build out the xml namespace for the data parse 
     var ns = element.GetDefaultNamespace(); 
     var role = element.Element(ns + "RoleOfPerson"); 
     var PersonName = role.Element(ns + "PersonName"); 
     var offender = element.Element(j + "RegisteredOffenderIdentification"); 
     var id = element.Attribute(s + "id").Value; 

     //This is an inner loop that gets all the addresss for a person and writes the info to the temp strings declared above. 
     element.Document.Root.Element(se + "SopsOffenderAddressList").Elements(se + "SopsOffenderAddress").Where(a => a.Element(se + "offenderIdRef").Value == id).ToList().ForEach(ad => 
     { 
      string aCode = ad.Element(sc + "AddressCategoryCode").Value; 
      switch (aCode.ToUpper()) 
      { 
       case "TEMP": 
        string TempAddressCode = ad.Element(sc + "AddressCategoryCode").Value; 
        string TempStreet = ad.Element(ns + "LocationStreet").Element(ns + "StreetFullText").Value; 
        string Tempcity = ad.Element(ns + "LocationCityName").Value; 
        string Tempstate = ad.Element(sc + "LocationUSStateCode").Value; 
        string TempzipOne = ad.Element(ns + "LocationPostalCode").Value; 
        string TempzipTwo = ad.Element(ns + "LocationPostalExtensionCode").Value; 
        TempLocation = string.Format("{0},{1},{2},{3},{4}", TempStreet, Tempcity, TempStreet, TempzipOne, TempzipTwo); 
        break; 

       case "PERM": 
        string PermAddressCode = ad.Element(sc + "AddressCategoryCode").Value; 
        string PermStreet = ad.Element(ns + "LocationStreet").Element(ns + "StreetFullText").Value; 
        string Permcity = ad.Element(ns + "LocationCityName").Value; 
        string PermCounty = ad.Element(sc + "LocationNonFLCounty").Value; 
        string Permstate = ad.Element(sc + "LocationUSStateCode").Value; 
        string PermzipOne = ad.Element(ns + "LocationPostalCode").Value; 
        string PermzipTwo = ad.Element(ns + "LocationPostalExtensionCode").Value; 
        PermLocation = string.Format("{0},{1},{2},{3},{4},{5}", PermStreet, Permcity, PermCounty, Permstate, PermzipOne, PermzipTwo); 
        break; 

       case "TRANS": 
        string TransAddressCode = ad.Element(sc + "AddressCategoryCode").Value; 
        string TransStreet = ad.Element(ns + "LocationStreet").Element(ns + "StreetFullText").Value; 
        string Transcity = ad.Element(ns + "LocationCityName").Value; 
        string Transstate = ad.Element(sc + "LocationUSStateCode").Value; 
        string TranszipOne = ad.Element(ns + "LocationPostalCode").Value; 
        string TranszipTwo = ad.Element(ns + "LocationPostalExtensionCode").Value; 
        TransLocation = string.Format("{0},{1},{2},{3},{4}", TransStreet, Transcity, TransStreet, TranszipOne, TranszipTwo); 
        break; 
      } 
     } 
    ); 

我現在需要添加到LINQ查詢，以進一步篩選數據。現在正在過濾的數據點是xml地址部分的縣信息。我試過使用這段代碼，但它不會編譯。

XDocument.Load(ConfigurationManager.AppSettings["XDocumentLoad"]) 
    .Root 
    .Elements(j + "RegisteredSexOffender") 
    .ToList() 
    .ForEach(element => 
    { 
     //build out the xml namespace for the data parse 
     var ns = element.GetDefaultNamespace(); 
     var role = element.Element(ns + "RoleOfPerson"); 
     var PersonName = role.Element(ns + "PersonName"); 
     var offender = element.Element(j + "RegisteredOffenderIdentification"); 
     var id = element.Attribute(s + "id").Value; 

     //This is an inner loop that gets all the addresss for a person and writes the info to the temp strings declared above. 
     element.Document.Root.Element(se + "SopsOffenderAddressList").Elements(se + "SopsOffenderAddress").Where(a => a.Element(se + "offenderIdRef").Value == id) && element.Document.Root.Element(se + "SopsOffenderAddressList").Elements(se + "SopsOffenderAddress").Elemetns(sc + "LocationNonFLCounty").Value=="ORANGE").ToList().ForEach(ad => 
     { 

正如你所看到的，我嘗試在linq聲明中添加一個和沒有運氣的子句。

我能得到這行代碼編譯，但現在我沒有得到任何記錄

      element.Document.Root.Element(se + "SopsOffenderAddressList").Elements(se + "SopsOffenderAddress").Where(a => a.Element(se + "offenderIdRef").Value == id && a.Element(sc + "LocationNonFLCounty").Value == "Orange").ToList().ForEach(ad => 

Answer 1

你需要學習如何細分你的代碼。閱讀這樣的單行非常困難。

element.Document.Root.Element(se + "SopsOffenderAddressList").Elements(se + "SopsOffenderAddress").Where(a => a.Element(se + "offenderIdRef").Value == id).ToList().ForEach(ad => 
// this line has 334 characters... 
element.Document.Root.Element(se + "SopsOffenderAddressList").Elements(se + "SopsOffenderAddress").Where(a => a.Element(se + "offenderIdRef").Value == id) && element.Document.Root.Element(se + "SopsOffenderAddressList").Elements(se + "SopsOffenderAddress").Elemetns(sc + "LocationNonFLCounty").Value=="ORANGE").ToList().ForEach(ad => 

這是二號線，您要修改一個：

element.Document.Root 
    .Element(se + "SopsOffenderAddressList") 
    .Elements(se + "SopsOffenderAddress") 
    .Where(a => a.Element(se + "offenderIdRef").Value == id) 
&& // this is not how you 'add' another 'filter'(where clause) 
element.Document.Root 
    .Element(se + "SopsOffenderAddressList") 
    .Elements(se + "SopsOffenderAddress") 
    .Elemetns(sc + "LocationNonFLCounty").Value=="ORANGE") // I think you mean to compare a *single* element to "ORANGE" 

    .ToList().ForEach(ad => 

您需要鏈中的where條款或同一where子句中結合他們：

element.Document.Root 
    .Element(se + "SopsOffenderAddressList") 
    .Elements(se + "SopsOffenderAddress") 

    // chaining (pick one) 
    .Where(a => a.Element(se + "offenderIdRef").Value == id) 
    .Where(a => a.Element(sc + "LocationNonFLCounty").Value == "ORANGE") 

    // combined (pick one) 
    .Where(a => 
     a.Element(se + "offenderIdRef").Value == id && 
     a.Element(sc + "LocationNonFLCounty").Value == "ORANGE") 

    .ToList().ForEach(ad =>