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序列化哈希表到文件

2011-6-18 18:28:16 3540

0 序列化哈希表到文件 using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Text; using System.Windows.Forms; using System.IO; using System.Runtime.Serialization.Formatters.Binary; using System.Collections; namespace HashtableTest { public partial class Form1 : Form { private string strFile = "c:\student.dat"; public Form1() { InitializeComponent(); InitListviewData(); } //从文件读取数据到列表 private void InitListviewData() { Hashtable ht = BinarySerialize.DeSerialize(strFile);//反序列化文件 if (ht != null) { IDictionaryEnumerator dic = ht.GetEnumerator(); while (dic.MoveNext()) { Student s = (Student)dic.Value; this.listView1.Items.AddRange(new System.Windows.Forms.ListViewItem[] { new ListViewItem(new string[]{s.Name,s.Number,s.Classes,s.Love})}); } } } private void button1_Click(object sender, EventArgs e) { Hashtable ht = new Hashtable(); string number = this.textBox2.Text.Trim(); if (number != "" && number != null) { ht = GetListviewData(); //获取列表数据 if (!ht.Contains(number)) //把新添加的学生信息添加到列表并写入文件 { Student s = new Student(this.textBox1.Text, this.textBox2.Text, this.textBox3.Text, this.textBox4.Text); ht.Add(number, s); this.listView1.Items.AddRange(new System.Windows.Forms.ListViewItem[] { new ListViewItem(new string[]{s.Name,s.Number,s.Classes,s.Love})}); BinarySerialize.Serialize(strFile, ht); } } } //获取列表数据,并把列表数据预装到哈希表 private Hashtable GetListviewData() { Hashtable ht = new Hashtable(); ListView.ListViewItemCollection lvc = this.listView1.Items; if (lvc.Count > 0) { for (int i = 0; i < lvc.Count; i++) { Student st=new Student(lvc[i].SubItems[0].Text, lvc[i].SubItems[1].Text, lvc[i].SubItems[2].Text, lvc[i].SubItems[3].Text); ht.Add(st.Number, st); } return ht; } return null; } } #region 学生信息类 [Serializable] public class Student { private String name, number, classes, love; public Student(String name, string number, string classes, string love) { this.name = name; this.number = number; this.classes = classes; this.love = love; } public string Name { get { return name; } } public string Number { get { return number; } } public string Classes { get { return classes; } } public string Love { get { return love; } } } #endregion #region 序列化哈希表到文件 public class BinarySerialize { //把哈希表对象序列化到文件 public static void Serialize(String strFile, Hashtable ht) { using (FileStream fs = new FileStream(strFile, FileMode.Create)) { BinaryFormatter formatter = new BinaryFormatter(); formatter.Serialize(fs, ht); } } //反序列化文件成哈希表对象 public static Hashtable DeSerialize(String strFile) { Hashtable hta = null; using (FileStream fs = new FileStream(strFile, FileMode.Open)) { BinaryFormatter formatter = new BinaryFormatter(); hta = (Hashtable)formatter.Deserialize(fs); } return hta; } } #endregion } 复制代码 0
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