ASP.NET对文件的操作，创建文件，判断文件是否存在，判断文件是否存在删除文件夹，获取文件大小。。。
操作文件必须引入using System.IO;命名空间
//获取一个文件的大小
System.IO.FileInfo file = new System.IO.FileInfo("C:\\t.txt");
int fileSize = (int)file.Length / 1024;//把文件大小换算成KB
Response.Write("<script>alert(" + fileSize.ToString() + ");</script>");
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-------创建文件夹using System.IO;
private void button2_Click(object sender, EventArgs e)
{
if (Directory.Exists("\\picture"))//判断一个文件夹是否存在
{
MessageBox.Show("directory exists");
}
else {
//创建一个文件夹
Directory.CreateDirectory("\\picture");
}
}
Directory.Delete(path,true);//删除一个文件夹，其中path是文件夹的绝对路径
---------------------打开一个文件
Process.Start("C:\\t.txt");//打开一个文件
public void Page_Load(Object src,EventArgs e)
{
StreamWriter rw = File.CreateText(Server.MapPath(".")+"[url=file://mytext.txt/]\\myText.txt[/url]");
rw.WriteLine("追逐理想");
rw.WriteLine("kzlll");
rw.WriteLine(".NET笔记");
rw.Flush();
rw.Close();
}
打开文本文件
StreamReader sr = File.OpenText(Server.MapPath(".")+"[url=file://mytext.txt/]\\myText.txt[/url]");
StringBuilder output = new StringBuilder();
string rl;
while((rl=sr.ReadLine())!=null)
{
output.Append(rl+"<br>");
}
lblFile.Text = output.ToString();
sr.Close();
C#追加文件
StreamWriter sw = File.AppendText(Server.MapPath(".")+"[url=file://mytext.txt/]\\myText.txt[/url]");
sw.WriteLine("追逐理想");
sw.WriteLine("kzlll");
sw.WriteLine(".NET笔记");
sw.Flush();
sw.Close();
C#拷贝文件
string OrignFile,NewFile;
OrignFile = Server.MapPath(".")+"[url=file://mytext.txt/]\\myText.txt[/url]";
NewFile = Server.MapPath(".")+"[url=file://mytextcopy.txt/]\\myTextCopy.txt[/url]";
File.Copy(OrignFile,NewFile,true);
C#删除文件
string delFile = Server.MapPath(".")+"[url=file://mytextcopy.txt/]\\myTextCopy.txt[/url]";
File.Delete(delFile);
C#移动文件
string OrignFile,NewFile;
OrignFile = Server.MapPath(".")+"[url=file://mytext.txt/]\\myText.txt[/url]";
NewFile = Server.MapPath(".")+"[url=file://mytextcopy.txt/]\\myTextCopy.txt[/url]";
File.Move(OrignFile,NewFile);
C#创建目录
// 创建目录c:\sixAge
DirectoryInfo d=Directory.CreateDirectory("c:\\sixAge");
// d1指向c:\sixAge\sixAge1
DirectoryInfo d1=d.CreateSubdirectory("sixAge1");
// d2指向c:\sixAge\sixAge1\sixAge1_1
DirectoryInfo d2=d1.CreateSubdirectory("sixAge1_1");
// 将当前目录设为c:\sixAge
Directory.SetCurrentDirectory("c:\\sixAge");
// 创建目录c:\sixAge\sixAge2
Directory.CreateDirectory("sixAge2");
// 创建目录c:\sixAge\sixAge2\sixAge2_1
Directory.CreateDirectory("sixAge2\\sixAge2_1");