.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:Textaaa.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:Textaaa.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:Textaaa.txt";
        private void DeleteFile_Click(object sender, EventArgs e)
        {
            File.Delete(path);
        }

方法二:

        private string path = @"F:Textaaa.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:Textaaa.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:Textaaa.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:Textaaa.txt";
        private void CopyFile_Click(object sender, EventArgs e)
        {
            File.Copy(path, @"F:Textbb.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:Textbb.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:Textaaa.txt";
        private void MoveFile_Click(object sender, EventArgs e)
        {
            File.Move(path, @"F:Testbb.txt");            
        }

方法二:

        private string path = @"F:Textaaa.txt";
        private void MoveFile_Click(object sender, EventArgs e)
        {           
            FileInfo MoveFIle = new FileInfo(path);
            MoveFIle.MoveTo(@"F:Testccc.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:Textaaa.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:Textaaa.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:Textaaa.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:Textaaa.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()+"
"+CreateTime.ToString()+"
"+LastAccessTime.ToString()+"
"+GetLastWriteTime.ToString());
        }

(九)修改辅助属性

注:只有File()类一种方法

        private string path = @"F:Textaaa.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:Textaaa.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,0,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:Textaaa.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, 0, nr.Length);
            stream.Close();
        }

　　StreamReader类：

　　　　打开

        private string path = @"F:Textaaa.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:Textaaa.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:Textaaa.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:Textaaa.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();
       }