Example of ASP.net C # using a text file as a database

1. DataSet base class

The code is as follows

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<summary> Data set base class </summary> <typeparam name= "T" ></typeparam> Public abstract class Basetb<t> where T:class { private static string _textfile = Path.Combine (configurationmanager.appsettings["Textdbdir"], typeof (T). Name + "TB.txt"); private static list<t> _data = null; <summary> Data containers </summary> Internal Static list<t> Container { Get { if (_data = null) { if (file.exists (_textfile)) { _data = jsonhelper.deserialize<list<t>> (File.readalltext (_textfile)); } Else { _data = new list<t> (); } } return _data; } } <summary> Get Records </summary> <param name= "obj" ></param> <returns></returns> Public abstract t get (t obj); <summary> Property Copy </summary> <param name= "Obj1" ></param> <param name= "Obj2" ></param> public abstract void Copy (t obj1, T obj2); <summary> Add a record </summary> <param name= "obj" ></param> <returns></returns> public bool Add (T obj) { BOOL result = FALSE; T item = Get (obj); if (item = NULL) { Container.add (obj); Save (); result = true; } return result; } <summary> Update records </summary> <param name= "obj" ></param> <returns></returns> public bool Update (T obj) { BOOL result = FALSE; T item = Get (obj); if (item!= NULL) { Copy (item, obj); Save (); result = true; } return result; } <summary> Delete a record </summary> <param name= "obj" ></param> <returns></returns> public bool Remove (T obj) { BOOL result = FALSE; T item = Get (obj); if (item!= NULL) { Container.remove (item); Save (); result = true; } return result; } <summary> Save data </summary> internal void Save () { File.writealltext (_textfile, Jsonhelper.serialize (Container)); } }

2. Entity and DataSet class

The code is as follows

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<summary> Entity classes </summary> public class User { public string Usn {get; set;} public string Pwd {get; set;} } <summary> Data sets </summary> public class Usertb:basetb<user> { #region Implement the Parent class method <summary> Get Object </summary> <param name= "User" ></param> <returns></returns> public override user get (user user) { return get (user. USN); } <summary> Property Copy </summary> <param name= "user1" ></param> <param name= "User2" ></param> public override void Copy (user user1, user user2) { User1. USN = User2. USN; User1. PWD = User2. PWD; } #endregion <summary> Get Object </summary> <param name= "USN" ></param> <returns></returns> Public User Get (string USN) { User result = null; foreach (User item in Container) { if (item. Usn.tolower () = = USN. ToLower ()) { result = Item; Break } } return result; } <summary> Delete a record </summary> <param name= "USN" ></param> public void Remove (string usn) { User user = new user () {USN = USN}; Remove (user); } }

3. Database class

The code is as follows

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///<summary> ///database ///</summary> public static class database {     <summary>    ///initialization    ///</summary>     Static Database ()     {         if (! Directory.Exists (configurationmanager.appsettings["Textdbdir"]))         {             directory.createdirectory ( configurationmanager.appsettings["Textdbdir"]);        }    } private static USERTB _USERTB; <summary> /// </summary> public static USERTB USERTB { Get { if (_USERTB = null) { _USERTB = new USERTB (); } return _USERTB; } } }

Call Example

The code is as follows	Copy Code
User user = new user () {Usn = "Dnawo", Pwd = "666666"}; DATABASE.USERTB.ADD (user); User. PWD = "999999"; Database.UserTB.Update (user);

So in the TXT file is stored by row tab-separated data storage format, so it is also convenient for it to find data oh.