Linq XML

写得比较啰嗦，自己记载备用

  1 public class XmlFunction

  2     {

  3         private static XDocument _doc = new XDocument();

  4         public static string FilePath = "mydata.xml";

  5         public XmlFunction()

  6         {

  7             _doc = XDocument.Load(FilePath);

  8         }

  9         public XmlFunction(string filepath)

 10             : this()

 11         {

 12             FilePath = filepath;

 13         }

 14 

 15         public static List<DataModel> ReadAll()

 16         {

 17             var list = new List<DataModel>();

 18             var xmllist = _doc.Descendants("datas").Elements("Jijin");

 19             foreach (var element in xmllist)

 20             {

 21                 var dataModel = new DataModel();

 22                 var xElement1 = element.Element("daima");

 23                 if (xElement1 != null)

 24                     dataModel.Daima = xElement1.Value == "" ? "0" : xElement1.Value;

 25                 var xElement2 = element.Element("Chicangliang");

 26                 if (xElement2 != null)

 27                     dataModel.Chicangliang = xElement2.Value == "" ? "0" : xElement2.Value;

 28                 var xElement3 = element.Element("Mairujia");

 29                 if (xElement3 != null)

 30                     dataModel.Mairujia = xElement3.Value == "" ? "0" : xElement3.Value;

 31                 list.Add(dataModel);

 32             }

 33             return list;

 34         }

 35 

 36         public DataModel Readone(string daima)

 37         {

 38             var selectItem = _doc.Descendants("Jijin").FirstOrDefault(p =>

 39             {

 40                 var element = p.Element("daima");

 41                 return element != null && element.Value == daima;

 42             });

 43             var model = new DataModel();

 44             if (selectItem == null) return model;

 45             model.Daima = daima;

 46             var chicangliang = "0";

 47             var mairujia = "0";

 48             var sichicangliang = selectItem.Element("Chicangliang");

 49             var simairujia = selectItem.Element("Mairujia");

 50             if (sichicangliang != null)

 51             {

 52                 if (!string.IsNullOrEmpty(sichicangliang.Value))

 53                     chicangliang = sichicangliang.Value;

 54             }

 55             if (simairujia != null)

 56             {

 57                 if (!string.IsNullOrEmpty(simairujia.Value))

 58                     mairujia = simairujia.Value;

 59             }

 60             model.Chicangliang = chicangliang;

 61             model.Mairujia = mairujia;

 62             return model;

 63         }

 64 

 65         public static bool Insert(DataModel model)

 66         {

 67             var db = new XElement("Jijin",

 68                  new XElement("daima", model.Daima),

 69                    new XElement("Chicangliang", model.Chicangliang),

 70                    new XElement("Mairujia", model.Mairujia)

 71                    );

 72             var element = _doc.Element("datas");

 73             if (element == null) return false;

 74             element.Add(db);

 75             _doc.Save(FilePath);

 76             return true;

 77         }

 78 

 79         public static bool Delete(string path, string node, string daima)

 80         {

 81             var selectItem = _doc.Descendants("Jijin").FirstOrDefault(p =>

 82             {

 83                 var element = p.Element("daima");

 84                 return element != null && element.Value == daima;

 85             });

 86             if (selectItem == null) return false;

 87             selectItem.Remove();

 88             _doc.Save(FilePath);

 89             return true;

 90         }

 91 

 92         public static bool Modify(DataModel model)

 93         {

 94             var selectItem = _doc.Descendants("datas").Elements("Jijin")

 95                 .FirstOrDefault(p =>

 96                 {

 97                     var element = p.Element("daima");

 98                     return element != null && element.Value == model.Daima;

 99                 });

             if (selectItem == null) return false;

             var element1 = selectItem.Element("daima");

             if (element1 != null) element1.Value = model.Daima;

             var element2 = selectItem.Element("Chicangliang");

             if (element2 != null) element2.Value = model.Chicangliang;

             var element3 = selectItem.Element("Mairujia");

             if (element3 != null) element3.Value = model.Mairujia;

             _doc.Save(FilePath);

             return true;

         }

     }