C#文件操作
文件操作
File类，FileInfo类.using System.IO命名空间
(一)创建
方法一:
1 private string path = @"F:\Text\aaa.txt";
2 private void CreateFile_Click(object sender, EventArgs e)
3 {
4 FileStream fs = File.Create(path);
5 fs.Close();//返回FileStream必须释放流
6 }
方法二:
1 private string path = @"F:\Text\aaa.txt";
2 private void CreateFile_Click(object sender, EventArgs e)
3 {
4 FileInfo CreateFile = new FileInfo(path);
5 FileStream stream = CreateFile.Create();
6 stream.Close();//返回FileStream类型必须释放流
7 }
(二)删除
方法一:
1 private string path = @"F:\Text\aaa.txt";
2 private void DeleteFile_Click(object sender, EventArgs e)
3 {
4 File.Delete(path);
5 }
方法二:
1 private string path = @"F:\Text\aaa.txt";
2 private void DeleteFile_Click(object sender, EventArgs e)
3 {
4 FileInfo DeleteFile = new FileInfo(path);
5 DeleteFile.Delete();
6 }
(三)是否存在
方法一:
1 private string path = @"F:\Text\aaa.txt";
2 private void ExistFile_Click(object sender, EventArgs e)
3 {
4 bool ex = File.Exists(path);
5 if (ex)
6 {
7 MessageBox.Show("存在");
8 }
9 else
10 {
11 MessageBox.Show("不存在");
12 }
13 }
方法二:
1 private string path = @"F:\Text\aaa.txt";
2 private void ExistFile_Click(object sender, EventArgs e)
3 {
4 FileInfo ExistFile = new FileInfo(path);
5 bool ex = ExistFile.Exists;
6 if (ex)
7 {
8 MessageBox.Show("存在");
9 }
10 else
11 {
12 MessageBox.Show("不存在");
13 }
14 }
(四)复制---不能跨盘符
方法一:
1 private string path = @"F:\Text\aaa.txt";
2 private void CopyFile_Click(object sender, EventArgs e)
3 {
4 File.Copy(path, @"F:\Text\bbb.txt");//复制的同时里面的内容也和复制
5 }
方法二:
1 private void CopyFile_Click(object sender, EventArgs e)
2 {
3 FileInfo CopyFile = new FileInfo(path);
4 CopyFile.CopyTo(@"F:\Text\bbb.txt"); //复制的同时里面的内容也和复制
5 }
(五)移动(改名)---不能跨盘符
注:Move()或MoveTo(): 1.路径不同名字相同(相当于--剪切),
2.路径不同名字不同(相当于--剪切+重命名),
3.路径相同名字不同(相当于--重命名).
且移动是同时将文件夹内的所有对象,移动.
方法一:
1 private string path = @"F:\Text\aaa.txt";
2 private void MoveFile_Click(object sender, EventArgs e)
3 {
4 File.Move(path, @"F:\Test\bbb.txt");
5 }
方法二:
1 private string path = @"F:\Text\aaa.txt";
2 private void MoveFile_Click(object sender, EventArgs e)
3 {
4 FileInfo MoveFIle = new FileInfo(path);
5 MoveFIle.MoveTo(@"F:\Test\ccc.txt");
6 }
(六)获得文件名
注:只有FileInfo()类一种方法
1.只获取文件名(貌似没什么用--下面show()的内容就是aaa.txt)
1 private string path = @"F:\Text\aaa.txt";
2 private void FileName_Click(object sender, EventArgs e)
3 {
4 FileInfo FileName = new FileInfo(path);
5 string name = FileName.Name;
6 MessageBox.Show(name);
7 }
2.或取文件全名(包括路径)
1 private string path = @"F:\Text\aaa.txt";
2 private void FileName_Click(object sender, EventArgs e)
3 {
4 FileInfo FileName = new FileInfo(path);
5 string name = FileName.FullName;
6 MessageBox.Show(name);
7 }
(七)获得扩展名
注:只有FileInfo()类一种方法
1 private string path = @"F:\Text\aaa.txt";
2 private void ExtensionName_Click(object sender, EventArgs e)
3 {
4 FileInfo ExtensionName = new FileInfo(path);
5 string exname = ExtensionName.Extension;
6 MessageBox.Show(exname);
7 }
(八)获取辅助属性
注:只有File()类一种方法
1 private string path = @"F:\Text\aaa.txt";
2 private void GetAttribute_Click(object sender, EventArgs e)
3 {
4 FileAttributes Attributes = File.GetAttributes(path);
5 DateTime CreateTime = File.GetCreationTime(path);
6 DateTime LastAccessTime = File.GetLastAccessTime(path);
7 DateTime GetLastWriteTime = File.GetLastWriteTime(path);
8 MessageBox.Show(Attributes.ToString()+"\n"+CreateTime.ToString()+"\n"+LastAccessTime.ToString()+"\n"+GetLastWriteTime.ToString());
9 }
(九)修改辅助属性
注:只有File()类一种方法
private string path = @"F:\Text\aaa.txt";
private void button1_Click(object sender, EventArgs e)
{
FileAttributes Attributes = new FileAttributes();
Attributes = FileAttributes.Hidden;
File.SetAttributes(path, Attributes);
File.SetCreationTime(path, DateTime.Now);
File.SetLastAccessTime(path, DateTime.Now);
File.SetLastWriteTime(path, DateTime.Now);
}
(十)打开保存
文件读写
注:所有打开new一个新类之后先写 类名.close()
FileStream类：比较通用。
打开
1 private string path = @"F:\Text\aaa.txt";
2 private void Open_Stream_Click(object sender, EventArgs e)
3 {
4 FileStream stream = new FileStream(path, FileMode.Open);//读出的数据是以二进制代码形式存储
5 byte[] nr = new byte[stream.Length];
6 stream.Read(nr,0,nr.Length);
7 stream.Close();
8 //把byte[]的内容变成字符串放在文本框中。
9 string s = System.Text.Encoding.Default.GetString(nr);
10 textBox1.Text = s;
11 }
保存
1 private string path = @"F:\Text\aaa.txt";
2 private void Save_Stream_Click(object sender, EventArgs e)
3 {
4 //把文本框的字符串变成二进制数组
5 byte[] nr = System.Text.Encoding.Default.GetBytes(textBox1.Text);
6 //送到文件中去
7 FileStream stream = new FileStream(path, FileMode.OpenOrCreate);
8 stream.Write(nr, 0, nr.Length);
9 stream.Close();
10 }
StreamReader类：
打开
1 private string path = @"F:\Text\aaa.txt";
2 private void Open_Reader_Click(object sender, EventArgs e)
3 {
4 StreamReader reader = new StreamReader(path, Encoding.Default);
5 string s = reader.ReadToEnd();
6 reader.Close();
7 textBox1.Text = "";
8 textBox1.Text = s;
9 }
或
1 private string path = @"F:\Text\aaa.txt";
2 private void Open_Writer_Click(object sender, EventArgs e)
3 {
4 FileStream stream = new FileStream(path, FileMode.Open);
5 StreamReader reader = new StreamReader(stream, Encoding.Default);
6 string s = reader.ReadToEnd();
7 reader.Close();
8 stream.Close();
9 textBox1.Text = s;
10 }
StreamWriter类：
1 private string path = @"F:\Text\aaa.txt";
2 private void Save_Writer_Click(object sender, EventArgs e)
3 {
4 StreamWriter writer = new StreamWriter(path, false, Encoding.Default);
5 writer.WriteLine(textBox1.Text);
6 writer.Close();
7 }
或
1 private string path = @"F:\Text\aaa.txt";
2 private void Save_Writer_Click(object sender, EventArgs e)
3 {
4 FileStream stream = new FileStream(path, FileMode.OpenOrCreate);
5 StreamWriter writer = new StreamWriter(stream);
6 writer.WriteLine(textBox1.Text);
7 writer.Close();
8 stream.Close();
9 }
10
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