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