Notes

///////////////////////////LinQ////////////////////////
filename: LinQ.cs

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

namespace ConsoleApp2
{
internal class LinQ
{
/* public static void Main(String[] args)
{
String[] names =
{
"Ayan","Raman","Suman","Charles"
};
UsingLinQAnonymous(names);
UsingLinQTOXMLAddRemoveElement();

}*/
private static void UsingLinQ(String[] names)
{
IEnumerable<String> query= from s in names
where s.Length==5
orderby s
select s.ToUpper();

foreach(String s in query)
{
Console.WriteLine(s);
}

}
private static void UsingLinQExtension(String[] names)
{
IEnumerable<String> query = names.Where(s=>s.Length==5)
.OrderBy(s=>s).OrderBy(s=>s.ToUpper());

foreach (String s in query)
{
Console.WriteLine(s);
}

}
private static void UsingLinQFunction(String[] names)
{
Func<string, bool> filter = s => s.Length == 5;
Func<string, string> extract = s => s;
Func<string, string> project = s => s.ToUpper();

IEnumerable<String> query = names.Where(filter)
.OrderBy(extract).OrderBy(project);

foreach (String s in query)
{
Console.WriteLine(s);
}

}
private static void UsingLinQAnonymous(String[] names)
{
Func<string, bool> filter = delegate (string s)
{
return s.Length == 5;

};

Func<string, string> extract = delegate (string s)
{
return s;

}; ;
Func<string, string> project = delegate (string s)
{
return s.ToUpper();

}; ;

IEnumerable<String> query = names.Where(filter)
.OrderBy(extract).OrderBy(project);

foreach (String s in query)
{
Console.WriteLine(s);
}

}
private static void UsingLinQTOXML()
{
string myXML = @"<Departments>
<Department>Account </Department>
<Department>Sales </Department>
<Department>Marketing </Department>
</Departments>";

XDocument xDocument= new XDocument();
xDocument=XDocument.Parse(myXML);
var result = xDocument.Element("Departments").Descendants();
foreach (XElement item in result)
{
Console.WriteLine(item.Value);
}


}
private static void UsingLinQTOXMLAddRemoveElement()
{
string myXML = @"<Departments>
<Department>Account </Department>
<Department>Sales </Department>
<Department>Marketing </Department>
</Departments>";

XDocument xDocument = new XDocument();
xDocument = XDocument.Parse(myXML);
xDocument.Element("Departments").Add(new XElement("Department", "Technology"));
xDocument.Element("Departments").AddFirst(new XElement("Department", "Consulting"));
var result = xDocument.Element("Departments").Descendants();
foreach (XElement item in result)
{
Console.WriteLine(item.Value);
}
xDocument.Descendants().Where(s=>s.Value=="Sales").Remove();
var result1 = xDocument.Element("Departments").Descendants();
foreach (XElement items in result1)
{
Console.WriteLine(items.Value);
}


}
}

}
///////////////////////////LinQ////////////////////////

///////////////////////////////////////////Employee/////////////////////

filename: Employee.cs

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

namespace ConsoleApp2
{
internal class Employee
{
public class Employees
{
public int Id { get; set; }
public string Name { get; set; }
public int Age { get; set; }
}
/* class Program
{
public static void Main()
{
Employees[] empArray =
{
new Employees(){Id=100,Name="John",Age=18 },
new Employees(){Id=101,Name="Charles",Age=21 },
new Employees(){Id=102,Name="Rob",Age=20 },
new Employees(){Id=103,Name="Bill",Age=17 }
};

Employees[] teenAgeEmployee = empArray.Where(s => s.Age > 12 && s.Age < 20).ToArray();
foreach(Employees emp in teenAgeEmployee)
{
Console.WriteLine(emp.Name);
}
Employees bill = empArray.Where(s => s.Name == "Bill").FirstOrDefault();
Console.WriteLine(bill.Name);

Employees emp5 = empArray.Where(s => s.Id == 101).FirstOrDefault();
Console.WriteLine(emp5.Name);

}



}*/
}
}

///////////////////////////////////////////Employee/////////////////////

/////////////////Delegates///////////////////////
filename: Delegate.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApp2
{
delegate void CustomDel(string s);
delegate int SumOperation(int i, int j);

internal class Delegate
{
static void Hello(string s)
{
Console.WriteLine($"Hello, {s}!!");

}
static void goodBye(string s)
{
Console.WriteLine($"Bye, {s}!!");

}
static int add(int i,int j)
{
return i + j;
}
/* static void Main()
{
CustomDel hiDel, byDel, multiDel, multiminus;
SumOperation sum;
hiDel = Hello;
byDel = goodBye;
multiDel = hiDel + byDel;
multiminus = multiDel - hiDel;
Console.WriteLine("Inviking Delegate");
hiDel("Ayan");

Console.WriteLine("Inviking Delegate");
byDel("Ayan");

Console.WriteLine("Inviking Delegate");
multiDel("Ayan");
Console.WriteLine("Inviking Delegate");
multiminus("Ayan");
//Console.Read();

sum = add;
Console.WriteLine("Inviking Delegate");

Console.WriteLine(sum(1, 2));



}*/
}
}

/////////////////Delegates///////////////////////

//////////////////////////Func Keyword////////////////////////
filename: FuncKeyword.cs

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

namespace ConsoleApp2
{
internal class FuncKeyword
{
static int add(int i, int j)
{
return i + j;
}
/* public static void Main()
{
Func<int, int, int> sum = add;
Console.WriteLine(sum(1,2));
}*/
}
}

//////////////////////////Func Keyword////////////////////////

//////////////////////////Action Keyword////////////////////////////
Filename: Action.cs

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

namespace ConsoleApp2
{
internal class Action
{
static void add(int i, int j)
{
Console.WriteLine(i + j);
}
public static void Main()
{
Action<int,int> sum=add;
sum(1,2);
}
}
}

//////////////////////////Action Keyword////////////////////////////