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                 });
100             if (selectItem == null) return false;
101             var element1 = selectItem.Element("daima");
102             if (element1 != null) element1.Value = model.Daima;
103             var element2 = selectItem.Element("Chicangliang");
104             if (element2 != null) element2.Value = model.Chicangliang;
105             var element3 = selectItem.Element("Mairujia");
106             if (element3 != null) element3.Value = model.Mairujia;
107             _doc.Save(FilePath);
108             return true;
109         }
110     }

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原文地址：https://www.cnblogs.com/hotss/p/4372270.html