.Net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";
         private void CreateFile_Click(object sender, EventArgs e)
         {
             FileStream fs = File.Create(path);
             fs.Close();//返回FileStream必须释放流
         }

方法二:

         private string path = @"F:\Text\aaa.txt";
         private void CreateFile_Click(object sender, EventArgs e)
         {
             FileInfo CreateFile = new FileInfo(path);
             FileStream stream = CreateFile.Create();
             stream.Close();//返回FileStream类型必须释放流
         }

(二)删除

方法一:

         private string path = @"F:\Text\aaa.txt";
         private void DeleteFile_Click(object sender, EventArgs e)
         {
             File.Delete(path);
         }

方法二:

         private string path = @"F:\Text\aaa.txt";
         private void DeleteFile_Click(object sender, EventArgs e)
         {
             FileInfo DeleteFile = new FileInfo(path);
             DeleteFile.Delete();
         }

(三)是否存在

方法一:

         private string path = @"F:\Text\aaa.txt";
         private void ExistFile_Click(object sender, EventArgs e)
         {
              bool ex = File.Exists(path);
              if (ex)
              {
                  MessageBox.Show("存在");
              }
              else
              {
                  MessageBox.Show("不存在");
              }
         }

方法二:

         private string path = @"F:\Text\aaa.txt";
         private void ExistFile_Click(object sender, EventArgs e)
         {
              FileInfo ExistFile = new FileInfo(path);
              bool ex = ExistFile.Exists;
              if (ex)
              {
                  MessageBox.Show("存在");
              }
              else
              {
                  MessageBox.Show("不存在");
              }
         }

(四)复制---不能跨盘符

方法一:

         private string path = @"F:\Text\aaa.txt";
         private void CopyFile_Click(object sender, EventArgs e)
         {
             File.Copy(path, @"F:\Text\bbb.txt");//复制的同时里面的内容也和复制
         }

方法二:

  private void CopyFile_Click(object sender, EventArgs e)
         {
             FileInfo CopyFile = new FileInfo(path);
             CopyFile.CopyTo(@"F:\Text\bbb.txt"); //复制的同时里面的内容也和复制
         }

(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:

         private string path = @"F:\Text\aaa.txt";
         private void MoveFile_Click(object sender, EventArgs e)
         {
             File.Move(path, @"F:\Test\bbb.txt");
         }

方法二:

         private string path = @"F:\Text\aaa.txt";
         private void MoveFile_Click(object sender, EventArgs e)
         {
             FileInfo MoveFIle = new FileInfo(path);
             MoveFIle.MoveTo(@"F:\Test\ccc.txt");
         }

(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)

         private string path = @"F:\Text\aaa.txt";
         private void FileName_Click(object sender, EventArgs e)
         {
             FileInfo FileName = new FileInfo(path);
             string name = FileName.Name;
             MessageBox.Show(name);
         }

　　2.或取文件全名(包括路径)

         private string path = @"F:\Text\aaa.txt";
         private void FileName_Click(object sender, EventArgs e)
         {
             FileInfo FileName = new FileInfo(path);
             string name = FileName.FullName;
             MessageBox.Show(name);
         }

(七)获得扩展名

注:只有FileInfo()类一种方法

         private string path = @"F:\Text\aaa.txt";
         private void ExtensionName_Click(object sender, EventArgs e)
         {
             FileInfo ExtensionName = new FileInfo(path);
             string exname = ExtensionName.Extension;
             MessageBox.Show(exname);
         }

(八)获取辅助属性

注:只有File()类一种方法

         private string path = @"F:\Text\aaa.txt";
         private void GetAttribute_Click(object sender, EventArgs e)
         {
             FileAttributes Attributes = File.GetAttributes(path);
             DateTime CreateTime = File.GetCreationTime(path);
             DateTime LastAccessTime = File.GetLastAccessTime(path);
             DateTime GetLastWriteTime =  File.GetLastWriteTime(path);
             MessageBox.Show(Attributes.ToString()+"\n"+CreateTime.ToString()+"\n"+LastAccessTime.ToString()+"\n"+GetLastWriteTime.ToString());
         }

(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

         private string path = @"F:\Text\aaa.txt";
         private void Open_Stream_Click(object sender, EventArgs e)
         {
             FileStream stream = new FileStream(path, FileMode.Open);//读出的数据是以二进制代码形式存储
             byte[] nr = new byte[stream.Length];
             stream.Read(nr,,nr.Length);
             stream.Close();
             //把byte[]的内容变成字符串放在文本框中。
             string s = System.Text.Encoding.Default.GetString(nr);
             textBox1.Text = s;
         }

　　　　保存

         private string path = @"F:\Text\aaa.txt";
         private void Save_Stream_Click(object sender, EventArgs e)
         {
             //把文本框的字符串变成二进制数组
             byte[] nr = System.Text.Encoding.Default.GetBytes(textBox1.Text);
             //送到文件中去
             FileStream stream = new FileStream(path, FileMode.OpenOrCreate);
             stream.Write(nr, , nr.Length);
             stream.Close();
         }

　　StreamReader类：

　　　　打开

         private string path = @"F:\Text\aaa.txt";
         private void Open_Reader_Click(object sender, EventArgs e)
         {
             StreamReader reader = new StreamReader(path, Encoding.Default);
             string s = reader.ReadToEnd();
             reader.Close();
             textBox1.Text = "";
             textBox1.Text = s;
         }

或

         private string path = @"F:\Text\aaa.txt";
         private void Open_Writer_Click(object sender, EventArgs e)
         {
             FileStream stream = new FileStream(path, FileMode.Open);
             StreamReader reader = new StreamReader(stream, Encoding.Default);
             string s = reader.ReadToEnd();
             reader.Close();
             stream.Close();
             textBox1.Text = s;
         }

　　StreamWriter类：

         private string path = @"F:\Text\aaa.txt";
         private void Save_Writer_Click(object sender, EventArgs e)
         {
             StreamWriter writer = new StreamWriter(path, false, Encoding.Default);
             writer.WriteLine(textBox1.Text);
             writer.Close();
         }

或

        private string path = @"F:\Text\aaa.txt";
        private void Save_Writer_Click(object sender, EventArgs e)
        {
            FileStream stream = new FileStream(path, FileMode.OpenOrCreate);
            StreamWriter writer = new StreamWriter(stream);
            writer.WriteLine(textBox1.Text);
            writer.Close();
            stream.Close();
        }