Linq to XML 增删改查

Linq to XML同样是对原C#访问XML文件的方法的封装，简化了用xpath进行xml的查询以及增加，修改，删除xml元素的操作。
C#访问XML文件的常用类：XmlDocument，XmlElement，XmlAttribute，XmlNode，XmlText等;

Linq to XML 中的常用类：XDocument，XElement，XAttribute。废话不多说了，直接上代码： xml文件数据格式如下

public class DataBaseInfo

{

public string ID { get; set; }

public string Company { get; set; }

public string Server { get; set; }

public string DataBase { get; set; }

public string UserName { get; set; }

public string Password { get; set; }

private static XDocument doc = new XDocument();

public static string filePath = ".\\DataBaseInfo.xml";

public DataBaseInfo() {

doc = XDocument.Load(filePath);

}

public DataBaseInfo(string filepath):this()

{

filePath = filepath;

}

/// <summary>

/// 增

/// </summary>

/// <returns></returns>

public bool Add()

{

XElement db = new XElement("DataBase",

new XAttribute("id", ID),

new XElement("company", new XAttribute("value",Company)),

new XElement("server", new XAttribute("value",Server)),

new XElement("database", new XAttribute("value",DataBase)),

new XElement("username", new XAttribute("value",UserName)),

new XElement("password", new XAttribute("value", Password))

);

try

{

//用XElement的Add方法

//XElement doc = XElement.Load(filePath);

//doc.Add(db);

//用XDocument的Add方法

doc.Element("DataBases").Add(db);

doc.Save(filePath);

return true;

}

catch

{

return false;

}

/// <summary>

/// 删

/// </summary>

/// <param name="id"></param>

/// <returns></returns>

public static bool Remove(string id)

{

XElement xe = (from db in doc.Element("DataBases").Elements("DataBase") where db.Attribute("id").Value == id select db).Single() as XElement;

try

{

xe.Remove();

doc.Save(filePath);

return true;

}

catch

{

return false;

}

/// <summary>

/// 改

/// </summary>

/// <returns></returns>

public bool Modify()

{

XElement xe = (from db in doc.Element("DataBases").Elements("DataBase") where db.Attribute("id").Value.ToString() == ID select db).Single();

try

{

xe.Element("company").Attribute("value").Value = Company;

xe.Element("server").Attribute("value").Value = Server;

xe.Element("database").Attribute("value").Value = DataBase;

xe.Element("username").Attribute("value").Value = UserName;

xe.Element("password").Attribute("value").Value = Password;

doc.Save(filePath);

return true;

}

catch

{

return false;

}

/// <summary>

/// 查

/// </summary>

/// <returns></returns>

public List<DataBaseInfo> GetAll()

{

List<DataBaseInfo> dbs = (from db in doc.Element("DataBases").Elements("DataBase")

select new DataBaseInfo

{

ID = db.Attribute("id").Value.ToString(),

Company = db.Element("company").Attribute("value").Value.ToString(),

Server = db.Element("server").Attribute("value").Value.ToString(),

DataBase = db.Element("database").Attribute("value").Value.ToString(),

UserName = db.Element("username").Attribute("value").Value.ToString(),

Password = db.Element("password").Attribute("value").Value.ToString()

}).ToList();

return dbs;

}

怎么样，如何对之前DOM方式访问XML熟悉的话，是不是发现简单了不少呢？

巴特西

Linq to XML 增删改查

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