Common methods for C # file streams

Open File Select Picture

private void Btnchoseimage_click (object sender, EventArgs e)
{
OpenFileDialog Objfiledialog = new OpenFileDialog ();
DialogResult result= Objfiledialog.showdialog ();
if (Result==dialogresult.ok)
{
This.pbStu.Image = Image.FromFile (objfiledialog.filename);
}
}

Write file
private void Btnwriteall_click (object sender, EventArgs e)
{
"1" Create a file stream
FileStream fs = new FileStream ("C:\\myfile.txt", FileMode.Create);

"2" Create writer
StreamWriter SW = new StreamWriter (Fs,encoding.default);

"3" writes data in a stream way
Sw. Write (This.txtContent.Text.Trim ());

"4" closes the writer
Sw. Close ();

"5" closes the file stream
Fs. Close ();
}
Read file
private void Btnreadall_click (object sender, EventArgs e)
{
"1" Create a file stream
FileStream fs = new FileStream ("C:\\myfile.txt", FileMode.Open);

"2" Create reader
StreamReader sr = new StreamReader (FS, Encoding.default);

"3" reads data in a stream
This.txtContent.Text = Sr. ReadToEnd ();

"4" Closes the reader
Sr. Close ();

"5" closes the file stream
Fs. Close ();
}
Simulating write system logs
private void Btnwriteline_click (object sender, EventArgs e)
{
"1" creates a file stream (file mode: Append)
FileStream fs = new FileStream ("C:\\myfile.txt", filemode.append);

"2" Create writer
StreamWriter SW = new StreamWriter (FS);

"3" writes data "line by row" in a stream
Sw. WriteLine (DateTime.Now.ToString () + "File operation OK! ");

"4" closes the writer
Sw. Close ();

"5" closes the file stream
Fs. Close ();
}
deleting files
private void Btndel_click (object sender, EventArgs e)
{
File.delete (This.txtFrom.Text.Trim ());
}
Copying files
private void Btncopy_click (object sender, EventArgs e)
{
if (File.exists (This.txtTo.Text.Trim ()))//First determine if the file exists (if the file exists, direct copy will cause an error)
{
File.delete (This.txtTo.Text.Trim ());//delete files
}
File.Copy (This.txtFrom.Text.Trim (), This.txtTo.Text.Trim ()); Copying files
}
Moving files
private void Btnremove_click (object sender, EventArgs e)
{
First determine if the destination path file exists (if the file exists, the direct copy will be error)
if (File.exists (This.txtTo.Text.Trim ()))
{
File.delete (This.txtTo.Text.Trim ());//delete files
}
if (File.exists (This.txtFrom.Text.Trim ()))//If the current file exists then move
{
Moving files
File.move (This.txtFrom.Text.Trim (), This.txtTo.Text.Trim ());
}
Else
{
MessageBox.Show ("file does not exist!) ");
}
}
Get the files in the current directory
private void Btnshowallfiles_click (object sender, EventArgs e)
{
string[] files = Directory.GetFiles ("C:\\myfiles");
This.txtContent.Clear ();
foreach (string item in files)
{
This.txtContent.Text + = Item + "\ r \ n";
}
}
Get all subdirectories under the specified directory
private void Btnshowsubdir_click (object sender, EventArgs e)
{
string[] dirs = directory.getdirectories ("C:\\drivers");
This.txtContent.Clear ();
foreach (string item in dirs)
{
This.txtContent.Text + = Item + "\ r \ n";
}
}

Create a Directory
private void Btncreate_click (object sender, EventArgs e)
{
Directory.CreateDirectory ("C:\\myfiles\\newfiles");
}

Delete all subdirectories and files under the specified directory
private void Btndelallfiles_click (object sender, EventArgs e)
{
Directory.delete ("C:\\myfiles");//require directory to be empty

You can delete a directory that is not empty by using the DirectoryInfo object
DirectoryInfo dir = new DirectoryInfo ("C:\\myfiles");
Dir. Delete (TRUE);
}

Common methods for C # file streams