对象耐久化是指将内存中的对象保留到可永远保留的存储装备中(如磁盘)的一种手艺。
本文引见的是除数据库以外的几种对象耐久化体式格局。
详细以下:
保留成文本:行将内存对象以字撙节的体式格局保留到文本中。
序列化成Xml:行将对象以Xml的花样存储。
序列化成Json:行将对象序列化成Json对象,然后存储。
序列化成二进制:行将对象序列化成二进制字撙节保留到文件中。
触及知识点:
序列化与反序列化
文件流的读写
ListView显现复选框,并横向分列
以下图所示【主要功能是将用户输入的信息保留成种种花样,并从各个文档中举行读取出来】:
保留和读取文本文档代码以下:
/// <summary> /// 保留成文本 /// </summary> /// <param name="sender"></param> /// <param name="e"></param> private void btnSaveTxt_Click(object sender, EventArgs e) { Dictionary<string, string> dicInfos = GetDictionaryInfos(); string filePath = "objPerson.txt"; //采纳using关键字,会自动开释 using (FileStream fs = new FileStream(filePath, FileMode.Create)) { using (StreamWriter sw = new StreamWriter(fs, Encoding.Default)) { foreach (var keyPair in dicInfos) { sw.WriteLine(string.Format("{0}={1}", keyPair.Key, keyPair.Value)); } } } } /// <summary> /// 从文本中读取 /// </summary> /// <param name="sender"></param> /// <param name="e"></param> private void btnReadTxt_Click(object sender, EventArgs e) { string filePath = "objPerson.txt"; Dictionary<string, string> dic = new Dictionary<string, string>(); //采纳using关键字,会自动开释 using (FileStream fs = new FileStream(filePath, FileMode.Open)) { using (StreamReader sw = new StreamReader(fs, Encoding.Default)) { while (!sw.EndOfStream) { string lineInfo = sw.ReadLine(); dic.Add(lineInfo.Split('=')[0], lineInfo.Split('=')[1]); } } } this.txtName.Text = dic["Name"]; this.dtBirthday.Text = dic["Birthday"]; if (dic["Gender"] == this.rbBoy.Text) { this.rbBoy.Checked = true; } else { this.rbGirl.Checked = true; } string[] loves = dic["Love"].Split('|'); foreach (var love in loves) { foreach (var item in this.lsvLove.Items) { ListViewItem li = item as ListViewItem; if (li.Text == love) { li.Checked = true; } } } }
保留和读取Xml文档代码以下:
/// <summary> /// 保留成Xml /// </summary> /// <param name="sender"></param> /// <param name="e"></param> private void btnSaveXml_Click(object sender, EventArgs e) { Person p = GetPersonInfos(); string filePath = "objPerson.xml"; using (FileStream fs = new FileStream(filePath, FileMode.Create)) { XmlSerializer serializer = new XmlSerializer(typeof(Person)); serializer.Serialize(fs, p); } } /// <summary> /// 从Xml中读取 /// </summary> /// <param name="sender"></param> /// <param name="e"></param> private void btnReadXml_Click(object sender, EventArgs e) { string filePath = "objPerson.xml"; Person p; using (FileStream fs = new FileStream(filePath, FileMode.Open)) { XmlSerializer serializer = new XmlSerializer(typeof(Person)); object obj= serializer.Deserialize(fs); p = obj as Person; } SetPersonInfos(p); }
保留和读取Json文档以下:
/// <summary> /// 保留成Json /// </summary> /// <param name="sender"></param> /// <param name="e"></param> private void btnSaveJson_Click(object sender, EventArgs e) { Person p = GetPersonInfos(); JavaScriptSerializer jserializer = new JavaScriptSerializer(); string strJson = jserializer.Serialize(p); string strRegex = @"\\/Date\((\d+)\)\\/"; MatchEvaluator evaluator = new MatchEvaluator(ConvertJsonDateToDateString); //对时间举行处置惩罚,须要援用System.Text.RegularExpressions;定名空间 Regex reg = new Regex(strRegex); strJson = reg.Replace(strJson, evaluator); string filePath = "objPerson.json"; using (FileStream fs = new FileStream(filePath, FileMode.Create)) { using (StreamWriter sw = new StreamWriter(fs, Encoding.Default)) { sw.Write(strJson); } } } /// <summary> /// 从Json中读取 /// </summary> /// <param name="sender"></param> /// <param name="e"></param> private void btnReadJson_Click(object sender, EventArgs e) { JavaScriptSerializer jserializer = new JavaScriptSerializer(); string filePath = "objPerson.json"; Person p; using (FileStream fs = new FileStream(filePath, FileMode.Open)) { using (StreamReader sw = new StreamReader(fs, Encoding.Default)) { string strJson = sw.ReadToEnd(); string strRegex = @"\d{4}-\d{2}-\d{2}\s\d{2}:\d{2}:\d{2}"; MatchEvaluator evaluator = new MatchEvaluator(ConvertDateStringToJsonDate); //对时间举行处置惩罚 Regex reg = new Regex(strRegex); strJson = reg.Replace(strJson, evaluator); p = jserializer.Deserialize<Person>(strJson); } } SetPersonInfos(p); }
保留和读取Bin文档以下:
/// <summary> /// 保留成二进制文件 /// </summary> /// <param name="sender"></param> /// <param name="e"></param> private void btnSaveBin_Click(object sender, EventArgs e) { Person p = GetPersonInfos(); string filePath = "objPerson.bin"; using (FileStream fs = new FileStream(filePath, FileMode.Create)) { BinaryFormatter bf = new BinaryFormatter(); bf.Serialize(fs, p); } } /// <summary> /// 读取二进制文件 /// </summary> /// <param name="sender"></param> /// <param name="e"></param> private void btnReadBin_Click(object sender, EventArgs e) { string filePath = "objPerson.bin"; Person p; using (FileStream fs = new FileStream(filePath, FileMode.Open)) { BinaryFormatter bf = new BinaryFormatter(); p= bf.Deserialize(fs) as Person; } SetPersonInfos(p); }
备注:实在对象耐久化和对象序列化是两个差别的观点。二者有关联却差别。
对象耐久化:是使对象能够保留到实体存储介质中,在对象生命周期完毕后能够再现。
对象序列化:是将对象或许数据结构转化成特定的花样,使其可在收集中传输,或许可存储在内存或许文件中。
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