Csharp 讀寫文件內容搜索自動彈出 AutoCompleteMode

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using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Windows.Forms; using System.IO;   namespace WindowsFormsStyle {     public partial class LoginForm : Form     {         protected string fileName = "login.dat";         string path = Directory.GetCurrentDirectory();         string file;         /// <summary>         ///         /// </summary>         public LoginForm()         {             InitializeComponent();         }         /// <summary>         /// 2011-11-2 塗聚文         /// 缔友计算机信息技术有限公司         /// 加载窗体         /// </summary>         /// <param name="sender"></param>         /// <param name="e"></param>         private void LoginForm_Load(object sender, EventArgs e)         {             file = path + "\\" + fileName;               textBox1.AutoCompleteMode = AutoCompleteMode.SuggestAppend;             textBox1.AutoCompleteSource = AutoCompleteSource.CustomSource;             if (File.Exists(file))//文件是否存在             {                 StreamReader sr = new StreamReader(file, true);                 string str = sr.ReadLine();                 while (str != null) //判断是否为空                 {                     if (!this.textBox1.AutoCompleteCustomSource.Contains(str))//记录是否存                     {                         this.textBox1.AutoCompleteCustomSource.Add(str);//不存在添加                     }                     str = sr.ReadLine();                 }                 sr.Close();             }         }         /// <summary>         /// 写入         /// 涂聚文         /// 缔友计算机信息技术有限公司         /// </summary>         /// <param name="sender"></param>         /// <param name="e"></param>         private void button1_Click(object sender, EventArgs e)         {             file = path + "\\" + fileName;             textBox1.AutoCompleteMode = AutoCompleteMode.SuggestAppend;             textBox1.AutoCompleteSource = AutoCompleteSource.CustomSource;             if (File.Exists(file))             {                if(!this.textBox1.AutoCompleteCustomSource.Contains(this.textBox1.Text.Trim()))//判断记录是否存在                {                    StreamWriter sw=new StreamWriter(file,true);                    sw.WriteLine(this.textBox1.Text.Trim()); //写入记录                    sw.Close();//关闭文件流                    if(!this.textBox1.AutoCompleteCustomSource.Contains(this.textBox1.Text))                    {                        this.textBox1.AutoCompleteCustomSource.Add(this.textBox1.Text);                    }                }             }             this.Close();           }     } }