asp.net 4.5 práctica ~ test14-5 escribir archivos

webform1.aspx

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm1.aspx.cs" Inherits="test14_5.WebForm1" %>

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
        <asp:Button ID="Button1" runat="server" Text="添加" OnClick="Button1_Click" />
        <br />
        <asp:Label ID="Label1" runat="server" Text=""></asp:Label>
    </div>
    </form>
</body>
</html>

webform1.aspx.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

namespace test14_5
{
    public partial class WebForm1 : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            string fileName = System.IO.Path.Combine(Request.PhysicalApplicationPath, @"test.txt");
            if (System.IO.File.Exists(fileName))
            {
                Label1.Text = readText();
            }
            else
            {
                string s = "The First Line!";
                appendText(s);
                Label1.Text = s;
            }
        }

        protected void Button1_Click(object sender, EventArgs e)
        {
            string str1 = TextBox1.Text.Trim();
            if (str1.Length > 0)
            {
                appendText(str1);
                Label1.Text = readText();
            }
        }

        //写文件
        private void appendText(string addText)
        {
            string fileName = System.IO.Path.Combine(Request.PhysicalApplicationPath, @"test.txt");
            System.IO.FileStream streamWrite = System.IO.File.Open(fileName, System.IO.FileMode.Append, System.IO.FileAccess.Write, System.IO.FileShare.None);
            byte[] data1 = System.Text.Encoding.ASCII.GetBytes(addText);
            streamWrite.Write(data1, 0, data1.Length);
            streamWrite.Flush();
            streamWrite.Close();
        }
        //读文件
        private string readText()
        {
            string fileName = System.IO.Path.Combine(Request.PhysicalApplicationPath, @"test.txt");
            System.IO.FileStream streamReader = System.IO.File.Open(fileName, System.IO.FileMode.Open, System.IO.FileAccess.Read, System.IO.FileShare.Read);
            byte[] data2 = new byte[streamReader.Length];
            streamReader.Read(data2, 0, (int)streamReader.Length);
            streamReader.Close();
            return System.Text.Encoding.ASCII.GetString(data2) ;
        }
    }
}

asp.net 4.5 práctica ~ test14-5 escribir archivos

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