Monthly Archives: April 2017

C# code snippet for setting up a FileSystemWatcher on a directory or file

using System;
using System.IO;
FileSystemWatcher watcher = new FileSystemWatcher();
watcher.Path = @"C:filedumps";
/* Watch for changes in LastWrite times, and the renaming of files */
watcher.NotifyFilter = NotifyFilters.LastWrite | NotifyFilters.FileName;
// watch text files
watcher.Filter = "*.txt";
// Add event handlers
watcher.Changed += new FileSystemEventHandler(OnChanged);
watcher.Renamed += new RenamedEventHandler(OnRenamed);

// raise events
watcher.EnableRaisingEvents = true;

private static void OnChanged(object source, FileSystemEventArgs e)
{
Console.WriteLine("File: " + e.FullPath + " " + e.ChangeType);
}

private static void OnRenamed(object source, RenamedEventArgs e)
{
Console.WriteLine("File: {0} renamed to {1}", e.OldFullPath, e.FullPath);
}

using System;

using System.IO;

FileSystemWatcher watcher = new FileSystemWatcher();

watcher.Path = @"C:filedumps";

/* Watch for changes in LastWrite times, and the renaming of files */

watcher.NotifyFilter = NotifyFilters.LastWrite | NotifyFilters.FileName;

// watch text files

watcher.Filter = "*.txt";

// Add event handlers

watcher.Changed += new FileSystemEventHandler(OnChanged);

watcher.Renamed += new RenamedEventHandler(OnRenamed);

// raise events

watcher.EnableRaisingEvents = true;

private static void OnChanged(object source, FileSystemEventArgs e)

{

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

}

private static void OnRenamed(object source, RenamedEventArgs e)

{

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

}

C# code snippet for creating a self hosted WCF service

ServiceHost employeeServiceHost = null;
            try
            {
                //Base Address for EmployeeService
                Uri httpBaseAddress = new Uri("http://localhost:8080/EmployeeService");
//Instantiate ServiceHost
employeeServiceHost = new ServiceHost(typeof(Employee.EmployeeService),httpBaseAddress);

//Add Endpoint to Host
employeeServiceHost.AddServiceEndpoint(typeof(EmployeeService.IEmployeeService),new WSHttpBinding(), "");

//Metadata Exchange
ServiceMetadataBehavior serviceBehavior = new ServiceMetadataBehavior();
serviceBehavior.HttpGetEnabled = true;
employeeServiceHost.Description.Behaviors.Add(serviceBehavior);

//Open
employeeServiceHost.Open();
Console.WriteLine("Employee Service is listening at : {0}", httpBaseAddress);
Console.ReadKey(); 
}
catch (Exception ex)
{
employeeServiceHost = null;
Console.WriteLine(" An error occurred with EmployeeService" + ex.Message);
}

ServiceHost employeeServiceHost = null;

try

{

//Base Address for EmployeeService

Uri httpBaseAddress = new Uri("http://localhost:8080/EmployeeService");

//Instantiate ServiceHost

employeeServiceHost = new ServiceHost(typeof(Employee.EmployeeService),httpBaseAddress);

//Add Endpoint to Host

employeeServiceHost.AddServiceEndpoint(typeof(EmployeeService.IEmployeeService),new WSHttpBinding(), "");

//Metadata Exchange

ServiceMetadataBehavior serviceBehavior = new ServiceMetadataBehavior();

serviceBehavior.HttpGetEnabled = true;

employeeServiceHost.Description.Behaviors.Add(serviceBehavior);

//Open

employeeServiceHost.Open();

Console.WriteLine("Employee Service is listening at : {0}", httpBaseAddress);

Console.ReadKey();

}

catch (Exception ex)

{

employeeServiceHost = null;

Console.WriteLine(" An error occurred with EmployeeService" + ex.Message);

}

C# code snippet for creating, extracting a compressed zip file

using System;
using System.IO;
using System.IO.Compression;

string filePath = @"c:tempEmployeeInfo";
string zipPath = @"c:tempEmployeeInfo.zip";
string extractPath = @"c:tempextract";

ZipFile.CreateFromDirectory(startPath, zipPath);

ZipFile.ExtractToDirectory(zipPath, extractPath);

using System;

using System.IO;

using System.IO.Compression;

string filePath = @"c:tempEmployeeInfo";

string zipPath = @"c:tempEmployeeInfo.zip";

string extractPath = @"c:tempextract";

ZipFile.CreateFromDirectory(startPath, zipPath);

ZipFile.ExtractToDirectory(zipPath, extractPath);

C# program to generate prime numbers from 1 to n

public static void IsPrime(int n)
  {
foreach (var num in Enumerable.Range(2, n-1))
{
if (num == 2)
{
Console.WriteLine(num);
continue;
}
var result = true;
for (int i = 2; i <= (int)Math.Sqrt(num); i++)
{
if (num % i == 0)
{
result = false;
break;
}
}
if (result)
Console.WriteLine(num);
}

}

public static void IsPrime(int n)

{

foreach (var num in Enumerable.Range(2, n-1))

{

if (num == 2)

{

Console.WriteLine(num);

continue;

}

var result = true;

for (int i = 2; i <= (int)Math.Sqrt(num); i++)

{

if (num % i == 0)

{

result = false;

break;

}

if (result)

Console.WriteLine(num);

}

C# program to test a number is prime or not

public static void IsPrime(int number)
  {
if (number == 1 || number == 0)
{
Console.WriteLine(false);
return;
}

if (number == 2)
{
Console.WriteLine(true);
return;
}
for (int i = 2; i <= (int)Math.Sqrt(number); i++)
{
if (number % i == 0)
{
Console.WriteLine(false);
return;
}
}
Console.WriteLine(true);
}

public static void IsPrime(int number)

{

if (number == 1 || number == 0)

{

Console.WriteLine(false);

return;

}

if (number == 2)

{

Console.WriteLine(true);

return;

}

for (int i = 2; i <= (int)Math.Sqrt(number); i++)

{

if (number % i == 0)

{

Console.WriteLine(false);

return;

}

Console.WriteLine(true);

}

C# program to check whether a string is palindromic

 public static bool isPalindromic(string s)  
           {  
                for (int i = 0, j = s.Length - 1; i < j; i++, j--)  
                {  
                     if (s[i] != s[j])  
                     {  
                          return false;  
                     }  
                }  
                return true;  
           }

public static bool isPalindromic(string s)

{

for (int i = 0, j = s.Length - 1; i < j; i++, j--)

{

if (s[i] != s[j])

{

return false;

}

return true;

}

Time complexity: O(n) Space complexity: O(1)