asp.net文件读取和修改保存练习

来源：互联网发布：linux jre 环境变量编辑：程序博客网时间：2024/06/06 15:46

cs代码如下：

using System;using System.Collections.Generic;using System.Linq;using System.Web;using System.Web.UI;using System.Web.UI.WebControls;using System.IO;public partial class 文件读取 : System.Web.UI.Page{    protected void Page_Load(object sender, EventArgs e)    {        if (!IsPostBack)        {            string[] arrs = Directory.GetFiles(MapPath("files"), "*.txt");//Directory            ///获取路径            //foreach (string _s in arrs)            //{            //    Response.Write(_s + "<br/>");//读取完整物理路径            //}            //Response.Write("-----------------------------------------------------------------------" + "<br/>");            //foreach (string _s in arrs)            //{            //    string _fname = Path.GetFileName(_s);//path类下的GetFileName            //    Response.Write(_fname + "<br/>");//读取文件名            //}            //Response.Write("-----------------------------------------------------------------------" + "<br/>");            //foreach (string _s in arrs)            //{            //    string _fname1 = Path.GetFileNameWithoutExtension(_s);            //    Response.Write(_fname1 + "<br/>");//不带扩展名的文件名            //}            ListItem li;            foreach (string _s in arrs)            {                li = new ListItem();                string fname = Path.GetFileName(_s);                li.Text = fname;                DropDownList1.Items.Add(li);            }        }            }    protected void btn_read_Click(object sender, EventArgs e)    {        string _fname = DropDownList1.SelectedValue;        //Response.Write(_fname);        string _path =Path.Combine( MapPath("files"),_fname);              if(File.Exists(_path)){//判断是否存在，重要步骤            TextBox1.Text = File.ReadAllText(_path);//读取显示            }    }    protected void btn_save_Click(object sender, EventArgs e)    {        string _fname = DropDownList1.SelectedValue;//获取下拉框选择项        //Response.Write(_fname);        string _path = Path.Combine(MapPath("files"), _fname);//拼路径        string _content = TextBox1.Text;//获取文本框内容        File.WriteAllText(_path,_content);//写入源文件    }}

aspx代码如下：

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="文件读取.aspx.cs" Inherits="文件读取" %><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head runat="server">    <title></title></head><body>    <form id="form1" runat="server">    <div>            <asp:DropDownList ID="DropDownList1" runat="server">        </asp:DropDownList>        <asp:Button ID="btn_read" runat="server" Text="读取" onclick="btn_read_Click" />        <asp:Button ID="btn_save" runat="server" Text="保存" onclick="btn_save_Click" />        <br />        <asp:TextBox ID="TextBox1" runat="server" Height="216px" Width="218px" TextMode="MultiLine"></asp:TextBox>        </div>    </form></body></html>

效果如图：

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