Category Archives: C#

C#. SystemIO. FileSystemWatcher

Posted on 06.09.2017 by Stanislav_Panteleev

MSDN Allows to watch if files where changed, rename, so on…

using System;
using System.IO;
using System.Security.Permissions;

public class Watcher
{

    public static void Main()
    {
    Run();

    }

    [PermissionSet(SecurityAction.Demand, Name="FullTrust")]
    public static void Run()
    {
        string[] args = System.Environment.GetCommandLineArgs();

        // If a directory is not specified, exit program.
        if(args.Length != 2)
        {
            // Display the proper way to call the program.
            Console.WriteLine("Usage: Watcher.exe (directory)");
            return;
        }

        // Create a new FileSystemWatcher and set its properties.
        FileSystemWatcher watcher = new FileSystemWatcher();
        watcher.Path = args[1];
        /* Watch for changes in LastAccess and LastWrite times, and
           the renaming of files or directories. */
        watcher.NotifyFilter = NotifyFilters.LastAccess | NotifyFilters.LastWrite
           | NotifyFilters.FileName | NotifyFilters.DirectoryName;
        // Only watch text files.
        watcher.Filter = "*.txt";

        // Add event handlers.
        watcher.Changed += new FileSystemEventHandler(OnChanged);
        watcher.Created += new FileSystemEventHandler(OnChanged);
        watcher.Deleted += new FileSystemEventHandler(OnChanged);
        watcher.Renamed += new RenamedEventHandler(OnRenamed);

        // Begin watching.
        watcher.EnableRaisingEvents = true;

        // Wait for the user to quit the program.
        Console.WriteLine("Press \'q\' to quit the sample.");
        while(Console.Read()!='q');
    }

    // Define the event handlers.
    private static void OnChanged(object source, FileSystemEventArgs e)
    {
        // Specify what is done when a file is changed, created, or deleted.
       Console.WriteLine("File: " +  e.FullPath + " " + e.ChangeType);
    }

    private static void OnRenamed(object source, RenamedEventArgs e)
    {
        // Specify what is done when a file is renamed.
        Console.WriteLine("File: {0} renamed to {1}", e.OldFullPath, e.FullPath);
    }
}

using System;

using System.IO;

using System.Security.Permissions;

public class Watcher

{

public static void Main()

{

Run();

}

[PermissionSet(SecurityAction.Demand, Name="FullTrust")]

public static void Run()

{

string[] args = System.Environment.GetCommandLineArgs();

// If a directory is not specified, exit program.

if(args.Length != 2)

{

// Display the proper way to call the program.

Console.WriteLine("Usage: Watcher.exe (directory)");

return;

}

// Create a new FileSystemWatcher and set its properties.

FileSystemWatcher watcher = new FileSystemWatcher();

watcher.Path = args[1];

/* Watch for changes in LastAccess and LastWrite times, and

the renaming of files or directories. */

watcher.NotifyFilter = NotifyFilters.LastAccess | NotifyFilters.LastWrite

| NotifyFilters.FileName | NotifyFilters.DirectoryName;

// Only watch text files.

watcher.Filter = "*.txt";

// Add event handlers.

watcher.Changed += new FileSystemEventHandler(OnChanged);

watcher.Created += new FileSystemEventHandler(OnChanged);

watcher.Deleted += new FileSystemEventHandler(OnChanged);

watcher.Renamed += new RenamedEventHandler(OnRenamed);

// Begin watching.

watcher.EnableRaisingEvents = true;

// Wait for the user to quit the program.

Console.WriteLine("Press \'q\' to quit the sample.");

while(Console.Read()!='q');

}

// Define the event handlers.

private static void OnChanged(object source, FileSystemEventArgs e)

{

// Specify what is done when a file is changed, created, or deleted.

Console.WriteLine("File: " + e.FullPath + " " + e.ChangeType);

}

private static void OnRenamed(object source, RenamedEventArgs e)

{

// Specify what is done when a file is renamed.

Console.WriteLine("File: {0} renamed to {1}", e.OldFullPath, e.FullPath);

}

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C#. BinaryWriter and BinaryReader

Posted on 06.09.2017 by Stanislav_Panteleev

MSDN

using System;
using System.IO;

class ConsoleApplication
{
    const string fileName = "AppSettings.dat";

    static void Main()
    {
        WriteDefaultValues();
        DisplayValues();
    }

    public static void WriteDefaultValues()
    {
        using (BinaryWriter writer = new BinaryWriter(File.Open(fileName, FileMode.Create)))
        {
            writer.Write(1.250F);
            writer.Write(@"c:\Temp");
            writer.Write(10);
            writer.Write(true);
        }
    }

    public static void DisplayValues()
    {
        float aspectRatio;
        string tempDirectory;
        int autoSaveTime;
        bool showStatusBar;

        if (File.Exists(fileName))
        {
            using (BinaryReader reader = new BinaryReader(File.Open(fileName, FileMode.Open)))
            {
                aspectRatio = reader.ReadSingle();
                tempDirectory = reader.ReadString();
                autoSaveTime = reader.ReadInt32();
                showStatusBar = reader.ReadBoolean();
            }

            Console.WriteLine("Aspect ratio set to: " + aspectRatio);
            Console.WriteLine("Temp directory is: " + tempDirectory);
            Console.WriteLine("Auto save time set to: " + autoSaveTime);
            Console.WriteLine("Show status bar: " + showStatusBar);
        }
    }
}

using System;

using System.IO;

class ConsoleApplication

{

const string fileName = "AppSettings.dat";

static void Main()

{

WriteDefaultValues();

DisplayValues();

}

public static void WriteDefaultValues()

{

using (BinaryWriter writer = new BinaryWriter(File.Open(fileName, FileMode.Create)))

{

writer.Write(1.250F);

writer.Write(@"c:\Temp");

writer.Write(10);

writer.Write(true);

}

public static void DisplayValues()

{

float aspectRatio;

string tempDirectory;

int autoSaveTime;

bool showStatusBar;

if (File.Exists(fileName))

{

using (BinaryReader reader = new BinaryReader(File.Open(fileName, FileMode.Open)))

{

aspectRatio = reader.ReadSingle();

tempDirectory = reader.ReadString();

autoSaveTime = reader.ReadInt32();

showStatusBar = reader.ReadBoolean();

}

Console.WriteLine("Aspect ratio set to: " + aspectRatio);

Console.WriteLine("Temp directory is: " + tempDirectory);

Console.WriteLine("Auto save time set to: " + autoSaveTime);

Console.WriteLine("Show status bar: " + showStatusBar);

}

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C#. SystemIO. Filestream

Posted on 06.09.2017 by Stanislav_Panteleev

MSDN

using System;
using System.IO;
using System.Text;

class Test
{

    public static void Main()
    {
        string path = @"c:\temp\MyTest.txt";

        // Delete the file if it exists.
        if (File.Exists(path))
        {
            File.Delete(path);
        }

        //Create the file.
        using (FileStream fs = File.Create(path))
        {
            AddText(fs, "This is some text");
            AddText(fs, "This is some more text,");
            AddText(fs, "\r\nand this is on a new line");
            AddText(fs, "\r\n\r\nThe following is a subset of characters:\r\n");

            for (int i=1;i < 120;i++)
            {
                AddText(fs, Convert.ToChar(i).ToString());

            }
        }

        //Open the stream and read it back.
        using (FileStream fs = File.OpenRead(path))
        {
            byte[] b = new byte[1024];
            UTF8Encoding temp = new UTF8Encoding(true);
            while (fs.Read(b,0,b.Length) > 0)
            {
                Console.WriteLine(temp.GetString(b));
            }
        }
    }

    private static void AddText(FileStream fs, string value)
    {
        byte[] info = new UTF8Encoding(true).GetBytes(value);
        fs.Write(info, 0, info.Length);
    }
}

using System;

using System.IO;

using System.Text;

class Test

{

public static void Main()

{

string path = @"c:\temp\MyTest.txt";

// Delete the file if it exists.

if (File.Exists(path))

{

File.Delete(path);

}

//Create the file.

using (FileStream fs = File.Create(path))

{

AddText(fs, "This is some text");

AddText(fs, "This is some more text,");

AddText(fs, "\r\nand this is on a new line");

AddText(fs, "\r\n\r\nThe following is a subset of characters:\r\n");

for (int i=1;i < 120;i++)

{

AddText(fs, Convert.ToChar(i).ToString());

}

//Open the stream and read it back.

using (FileStream fs = File.OpenRead(path))

{

byte[] b = new byte[1024];

UTF8Encoding temp = new UTF8Encoding(true);

while (fs.Read(b,0,b.Length) > 0)

{

Console.WriteLine(temp.GetString(b));

}

private static void AddText(FileStream fs, string value)

{

byte[] info = new UTF8Encoding(true).GetBytes(value);

fs.Write(info, 0, info.Length);

}

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C#. SystemIO. StreamWriter and StreamReader

Posted on 06.09.2017 by Stanislav_Panteleev

Example from Troelsen

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.IO;

namespace StringWriterReaderExample
{
    class Program
    {
        static void Main(string[] args)
        {
            using (StringWriter sw = new StringWriter())
            {
                sw.WriteLine("someLine");
                StringBuilder sb = sw.GetStringBuilder();
                sb.Insert(0, "Hey!");
                Console.WriteLine("->{0}", sb.ToString());
                sb.Remove(0, "Hey!".Length);
                Console.WriteLine("->{0}", sb.ToString());



                using (StringReader sr = new StringReader(sw.ToString()))
                {
                    string input = null;
                    while ((input=sr.ReadLine())!=null)
                    {
                        Console.WriteLine();
                    }
                }

                Console.ReadLine();



            }




        }
    }


}

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using System.IO;

namespace StringWriterReaderExample

{

class Program

{

static void Main(string[] args)

{

using (StringWriter sw = new StringWriter())

{

sw.WriteLine("someLine");

StringBuilder sb = sw.GetStringBuilder();

sb.Insert(0, "Hey!");

Console.WriteLine("->{0}", sb.ToString());

sb.Remove(0, "Hey!".Length);

Console.WriteLine("->{0}", sb.ToString());

using (StringReader sr = new StringReader(sw.ToString()))

{

string input = null;

while ((input=sr.ReadLine())!=null)

{

Console.WriteLine();

}

Console.ReadLine();

}

MSDN

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;

namespace StreamReadWrite
{
    class Program
    {
        static void Main(string[] args)
        {
            // Get the directories currently on the C drive.
            DirectoryInfo[] cDirs = new DirectoryInfo(@"c:\").GetDirectories();

            // Write each directory name to a file.
            using (StreamWriter sw = new StreamWriter("CDriveDirs.txt"))
            {
                foreach (DirectoryInfo dir in cDirs)
                {
                    sw.WriteLine(dir.Name);

                }
            }

            // Read and show each line from the file.
            string line = "";
            using (StreamReader sr = new StreamReader("CDriveDirs.txt"))
            {
                while ((line = sr.ReadLine()) != null)
                {
                    Console.WriteLine(line);
                }
            }
        }
    }
}

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.IO;

namespace StreamReadWrite

{

class Program

{

static void Main(string[] args)

{

// Get the directories currently on the C drive.

DirectoryInfo[] cDirs = new DirectoryInfo(@"c:\").GetDirectories();

// Write each directory name to a file.

using (StreamWriter sw = new StreamWriter("CDriveDirs.txt"))

{

foreach (DirectoryInfo dir in cDirs)

{

sw.WriteLine(dir.Name);

}

// Read and show each line from the file.

string line = "";

using (StreamReader sr = new StreamReader("CDriveDirs.txt"))

{

while ((line = sr.ReadLine()) != null)

{

Console.WriteLine(line);

}

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C#. SystemIO.File

Posted on 06.09.2017 by Stanislav_Panteleev

MSDN

using System;
using System.IO;

class Test
{
    public static void Main()
    {
        string path = @"c:\temp\MyTest.txt";
        if (!File.Exists(path))
        {
            // Create a file to write to.
            using (StreamWriter sw = File.CreateText(path))
            {
                sw.WriteLine("Hello");
                sw.WriteLine("And");
                sw.WriteLine("Welcome");
            }
        }

        // Open the file to read from.
        using (StreamReader sr = File.OpenText(path))
        {
            string s = "";
            while ((s = sr.ReadLine()) != null)
            {
                Console.WriteLine(s);
            }
        }
    }
}

using System;

using System.IO;

class Test

{

public static void Main()

{

string path = @"c:\temp\MyTest.txt";

if (!File.Exists(path))

{

// Create a file to write to.

using (StreamWriter sw = File.CreateText(path))

{

sw.WriteLine("Hello");

sw.WriteLine("And");

sw.WriteLine("Welcome");

}

// Open the file to read from.

using (StreamReader sr = File.OpenText(path))

{

string s = "";

while ((s = sr.ReadLine()) != null)

{

Console.WriteLine(s);

}

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C#.SystemIO.FileInfo

Posted on 06.09.2017 by Stanislav_Panteleev

MSDN Следующий пример демонстрирует некоторые из основных членов FileInfo класса. Если сначала получить свойства FileInfo вызовов Refresh метод и кэши сведения о файле. При последующих вызовах, необходимо вызвать метод Refresh для получения самой последней копии сведений.

using System;
using System.IO;

class Test 
{

    public static void Main() 
    {
        string path = Path.GetTempFileName();
        FileInfo fi1 = new FileInfo(path);

        //Create a file to write to.
        using (StreamWriter sw = fi1.CreateText()) 
        {
            sw.WriteLine("Hello");
            sw.WriteLine("And");
            sw.WriteLine("Welcome");
        }	

        //Open the file to read from.
        using (StreamReader sr = fi1.OpenText()) 
        {
            string s = "";
            while ((s = sr.ReadLine()) != null) 
            {
                Console.WriteLine(s);
            }
        }

        try 
        {
            string path2 = Path.GetTempFileName();
            FileInfo fi2 = new FileInfo(path2);

            //Ensure that the target does not exist.
            fi2.Delete();

            //Copy the file.
            fi1.CopyTo(path2);
            Console.WriteLine("{0} was copied to {1}.", path, path2);

            //Delete the newly created file.
            fi2.Delete();
            Console.WriteLine("{0} was successfully deleted.", path2);

        } 
        catch (Exception e) 
        {
            Console.WriteLine("The process failed: {0}", e.ToString());
        }
    }
}

using System;

using System.IO;

class Test

{

public static void Main()

{

string path = Path.GetTempFileName();

FileInfo fi1 = new FileInfo(path);

//Create a file to write to.

using (StreamWriter sw = fi1.CreateText())

{

sw.WriteLine("Hello");

sw.WriteLine("And");

sw.WriteLine("Welcome");

}

//Open the file to read from.

using (StreamReader sr = fi1.OpenText())

{

string s = "";

while ((s = sr.ReadLine()) != null)

{

Console.WriteLine(s);

}

try

{

string path2 = Path.GetTempFileName();

FileInfo fi2 = new FileInfo(path2);

//Ensure that the target does not exist.

fi2.Delete();

//Copy the file.

fi1.CopyTo(path2);

Console.WriteLine("{0} was copied to {1}.", path, path2);

//Delete the newly created file.

fi2.Delete();

Console.WriteLine("{0} was successfully deleted.", path2);

}

catch (Exception e)

{

Console.WriteLine("The process failed: {0}", e.ToString());

}

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C#.SystemIO.DriveInfo

Posted on 06.09.2017 by Stanislav_Panteleev

MSDN

using System;
using System.IO;

class Test
{
    public static void Main()
    {
        DriveInfo[] allDrives = DriveInfo.GetDrives();

        foreach (DriveInfo d in allDrives)
        {
            Console.WriteLine("Drive {0}", d.Name);
            Console.WriteLine("  Drive type: {0}", d.DriveType);
            if (d.IsReady == true)
            {
                Console.WriteLine("  Volume label: {0}", d.VolumeLabel);
                Console.WriteLine("  File system: {0}", d.DriveFormat);
                Console.WriteLine(
                    "  Available space to current user:{0, 15} bytes", 
                    d.AvailableFreeSpace);

                Console.WriteLine(
                    "  Total available space:          {0, 15} bytes",
                    d.TotalFreeSpace);

                Console.WriteLine(
                    "  Total size of drive:            {0, 15} bytes ",
                    d.TotalSize);
            }
        }
    }
}
/* 
This code produces output similar to the following:

Drive A:\
  Drive type: Removable
Drive C:\
  Drive type: Fixed
  Volume label: 
  File system: FAT32
  Available space to current user:     4770430976 bytes
  Total available space:               4770430976 bytes
  Total size of drive:                10731683840 bytes 
Drive D:\
  Drive type: Fixed
  Volume label: 
  File system: NTFS
  Available space to current user:    15114977280 bytes
  Total available space:              15114977280 bytes
  Total size of drive:                25958948864 bytes 
Drive E:\
  Drive type: CDRom

The actual output of this code will vary based on machine and the permissions
granted to the user executing it.
*/

using System;

using System.IO;

class Test

{

public static void Main()

{

DriveInfo[] allDrives = DriveInfo.GetDrives();

foreach (DriveInfo d in allDrives)

{

Console.WriteLine("Drive {0}", d.Name);

Console.WriteLine(" Drive type: {0}", d.DriveType);

if (d.IsReady == true)

{

Console.WriteLine(" Volume label: {0}", d.VolumeLabel);

Console.WriteLine(" File system: {0}", d.DriveFormat);

Console.WriteLine(

" Available space to current user:{0, 15} bytes",

d.AvailableFreeSpace);

Console.WriteLine(

" Total available space: {0, 15} bytes",

d.TotalFreeSpace);

Console.WriteLine(

" Total size of drive: {0, 15} bytes ",

d.TotalSize);

}

This code produces output similar to the following:

Drive A:\

Drive type: Removable

Drive C:\

Drive type: Fixed

Volume label:

File system: FAT32

Available space to current user: 4770430976 bytes

Total available space: 4770430976 bytes

Total size of drive: 10731683840 bytes

Drive D:\

Drive type: Fixed

Volume label:

File system: NTFS

Available space to current user: 15114977280 bytes

Total available space: 15114977280 bytes

Total size of drive: 25958948864 bytes

Drive E:\

Drive type: CDRom

The actual output of this code will vary based on machine and the permissions

granted to the user executing it.

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C#.SystemIO.Directory

Posted on 06.09.2017 by Stanislav_Panteleev

MSDN The following example shows how to retrieve all the text files from a directory and move them to a new directory. After the files are moved, they no longer exist in the original directory.

using System;
using System.IO;

namespace ConsoleApplication
{
    class Program
    {
        static void Main(string[] args)
        {
            string sourceDirectory = @"C:\current";
            string archiveDirectory = @"C:\archive";

            try
            {
                var txtFiles = Directory.EnumerateFiles(sourceDirectory, "*.txt");

                foreach (string currentFile in txtFiles)
                {
                    string fileName = currentFile.Substring(sourceDirectory.Length + 1);
                    Directory.Move(currentFile, Path.Combine(archiveDirectory, fileName));
                }
            }
            catch (Exception e)
            {
                Console.WriteLine(e.Message);
            }
        }
    }
}

using System;

using System.IO;

namespace ConsoleApplication

{

class Program

{

static void Main(string[] args)

{

string sourceDirectory = @"C:\current";

string archiveDirectory = @"C:\archive";

try

{

var txtFiles = Directory.EnumerateFiles(sourceDirectory, "*.txt");

foreach (string currentFile in txtFiles)

{

string fileName = currentFile.Substring(sourceDirectory.Length + 1);

Directory.Move(currentFile, Path.Combine(archiveDirectory, fileName));

}

catch (Exception e)

{

Console.WriteLine(e.Message);

}

The following example demonstrates … Continue reading →

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C#.SystemIO.DirectoryInfo

Posted on 06.09.2017 by Stanislav_Panteleev

MSDN Example from Troelsen everywhere using SystemIO;

        static void ShowWindowsDirectoryInfo()
        {
            DirectoryInfo dir = new DirectoryInfo(@"C:\WIndows");
            Console.WriteLine("Fullname {0}",dir.FullName);
            Console.WriteLine("Name {0}", dir.Name);
            Console.WriteLine("Parent {0}", dir.Parent);
            Console.WriteLine("Creation {0}", dir.CreationTime);
            Console.WriteLine("Attributes {0}", dir.Attributes);
            Console.WriteLine("Root {0}", dir.Root);
            

        }

static void ShowWindowsDirectoryInfo()

{

DirectoryInfo dir = new DirectoryInfo(@"C:\WIndows");

Console.WriteLine("Fullname {0}",dir.FullName);

Console.WriteLine("Name {0}", dir.Name);

Console.WriteLine("Parent {0}", dir.Parent);

Console.WriteLine("Creation {0}", dir.CreationTime);

Console.WriteLine("Attributes {0}", dir.Attributes);

Console.WriteLine("Root {0}", dir.Root);

}

Enum image files example

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C#. Threading useful posts

Posted on 05.09.2017 by Stanislav_Panteleev

Многопоточность. Что использовать [закрыт] Работа с контролами из фонового потока

Posted in C# | Comments Off

Category Archives: C#

C#. SystemIO. FileSystemWatcher

C#. BinaryWriter and BinaryReader

C#. SystemIO. Filestream

C#. SystemIO. StreamWriter and StreamReader

C#. SystemIO.File

C#.SystemIO.FileInfo

C#.SystemIO.DriveInfo

C#.SystemIO.Directory

C#.SystemIO.DirectoryInfo

C#. Threading useful posts

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