其实,建立一个文本文件、写一个文本文件、读取一个文本文件是一件非常容易的事情,但是当你查MSDN的时候,你会发现,有很多的方法,比如,在你第一次做“写文件”操作的时候就可以直接建立一个新的文件等等……
这么多的方法,和构造函数,令我眼花缭乱。
下面将这三个操作独立出来,分别用代码表示:
0、首先写个文件路径,为下面的操作做准备。
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1、建立文件:
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2、写操作:
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using (FileStream fs = new FileStream(LicenseFile, FileMode.Open, FileAccess.Write)) { using(StreamWriter sw = new StreamWriter(fs)) { sw.WriteLine(""); //sw.Flush(); } }
3、读操作:
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using (FileStream fs = new FileStream(LicenseFile, FileMode.Open, FileAccess.Read)) { using (StreamReader sr = new StreamReader(fs)) { if (string.IsNullOrWhiteSpace(str = sr.ReadLine())) { // License file is empty. return false; } } }
例:
private void writeLog(string logString)
{
string file = @"D:\log.txt";
System.IO.FileStream fs = System.IO.File.Create(file);
fs.Close();
using(System.IO.StreamWriter sw = System.IO.File.AppendText(file))
{
sw.WriteLine(logString);
sw.Close();
}
}
{
string file = @"D:\log.txt";
System.IO.FileStream fs = System.IO.File.Create(file);
fs.Close();
using(System.IO.StreamWriter sw = System.IO.File.AppendText(file))
{
sw.WriteLine(logString);
sw.Close();
}
}
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//C#追加文件
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StreamWriter sw = File.AppendText(Server.MapPath(".")+"\\myText.txt");
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sw.WriteLine("追逐理想");
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sw.WriteLine("kzlll");
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sw.WriteLine(".NET笔记");
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sw.Flush();
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sw.Close();
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//C#拷贝文件
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string OrignFile,NewFile;
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OrignFile = Server.MapPath(".")+"\\myText.txt";
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NewFile = Server.MapPath(".")+"\\myTextCopy.txt";
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File.Copy(OrignFile,NewFile,true);
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//C#删除文件
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string delFile = Server.MapPath(".")+"\\myTextCopy.txt";
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File.Delete(delFile);
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//C#移动文件
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string OrignFile,NewFile;
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OrignFile = Server.MapPath(".")+"\\myText.txt";
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NewFile = Server.MapPath(".")+"\\myTextCopy.txt";
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File.Move(OrignFile,NewFile);
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//C#创建目录
26
// 创建目录c:\sixAge
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DirectoryInfo d=Directory.CreateDirectory("c:\\sixAge");
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// d1指向c:\sixAge\sixAge1
29
DirectoryInfo d1=d.CreateSubdirectory("sixAge1");
30
// d2指向c:\sixAge\sixAge1\sixAge1_1
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DirectoryInfo d2=d1.CreateSubdirectory("sixAge1_1");
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// 将当前目录设为c:\sixAge
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Directory.SetCurrentDirectory("c:\\sixAge");
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// 创建目录c:\sixAge\sixAge2
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Directory.CreateDirectory("sixAge2");
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// 创建目录c:\sixAge\sixAge2\sixAge2_1
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Directory.CreateDirectory("sixAge2\\sixAge2_1");
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//递归删除文件夹及文件
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<%@ Page Language=C#%>
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<%@ Import namespace="System.IO"%>
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<Script runat=server>
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public void DeleteFolder(string dir)
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{
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if (Directory.Exists(dir)) //如果存在这个文件夹删除之
46
{
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foreach(string d in Directory.GetFileSystemEntries(dir))
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{
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if(File.Exists(d))
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File.Delete(d); //直接删除其中的文件
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else
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DeleteFolder(d); //递归删除子文件夹
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}
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Directory.Delete(dir); //删除已空文件夹
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Response.Write(dir+" 文件夹删除成功");
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}
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else
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Response.Write(dir+" 该文件夹不存在"); //如果文件夹不存在则提示
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}
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protected void Page_Load (Object sender ,EventArgs e)
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{
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string Dir="D:\\gbook\\11";
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DeleteFolder(Dir); //调用函数删除文件夹
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}
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// ======================================================
// 实现一个静态方法将指定文件夹下面的所有内容copy到目标文件夹下面
// 如果目标文件夹为只读属性就会报错。
// April 18April2005 In STU
// ======================================================
1
public static void CopyDir(string srcPath,string aimPath)
2
{
3
try
4
{
5
// 检查目标目录是否以目录分割字符结束如果不是则添加之
6
if(aimPath[aimPath.Length-1] != Path.DirectorySeparatorChar)
7
aimPath += Path.DirectorySeparatorChar;
8
// 判断目标目录是否存在如果不存在则新建之
9
if(!Directory.Exists(aimPath))
10
Directory.CreateDirectory(aimPath);
11
// 得到源目录的文件列表,该里面是包含文件以及目录路径的一个数组
12
// 如果你指向copy目标文件下面的文件而不包含目录请使用下面的方法
13
// string[] fileList = Directory.GetFiles(srcPath);
14
string[] fileList = Directory.GetFileSystemEntries(srcPath);
15
// 遍历所有的文件和目录
16
foreach(string file in fileList)
17
{
18
// 先当作目录处理如果存在这个目录就递归Copy该目录下面的文件
19
if(Directory.Exists(file))
20
CopyDir(file,aimPath+Path.GetFileName(file));
21
// 否则直接Copy文件
22
else
23
File.Copy(file,aimPath+Path.GetFileName(file),true);
24
}
25
}
26
catch (Exception e)
27
{
28
MessageBox.Show (e.ToString());
29
}
30
}
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// ======================================================
// 实现一个静态方法将指定文件夹下面的所有内容Detele
// 测试的时候要小心操作,删除之后无法恢复。
// April 18April2005 In STU
// ======================================================
1
public static void DeleteDir(string aimPath)
2
{
3
try
4
{
5
// 检查目标目录是否以目录分割字符结束如果不是则添加之
6
if(aimPath[aimPath.Length-1] != Path.DirectorySeparatorChar)
7
aimPath += Path.DirectorySeparatorChar;
8
// 得到源目录的文件列表,该里面是包含文件以及目录路径的一个数组
9
// 如果你指向Delete目标文件下面的文件而不包含目录请使用下面的方法
10
// string[] fileList = Directory.GetFiles(aimPath);
11
string[] fileList = Directory.GetFileSystemEntries(aimPath);
12
// 遍历所有的文件和目录
13
foreach(string file in fileList)
14
{
15
// 先当作目录处理如果存在这个目录就递归Delete该目录下面的文件
16
if(Directory.Exists(file))
17
{
18
DeleteDir(aimPath+Path.GetFileName(file));
19
}
20
// 否则直接Delete文件
21
else
22
{
23
File.Delete (aimPath+Path.GetFileName(file));
24
}
25
}
26
//删除文件夹
27
System.IO .Directory .Delete (aimPath,true);
28
}
29
catch (Exception e)
30
{
31
MessageBox.Show (e.ToString());
32
}
33
}
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