Frequently Used Extension Methods in LINQ

TAKE () LINQ Method

Used to get the Top "N" items from the list. Note it can be taken in sequence order.

/// <summary>
/// This is used to take Top 'N' items form the list.Like "Top 5" in sql.
/// </summary>
public static void LinqInTake()
{
List<int> list = GetNumberList();

//This takes only the Top two items from the list and eliminate others.
//"2" in param indicates how much item you need.
//ToList() helps to convert IEnumerable to List.
list = list.Take(2).ToList();

//Print
PrintLis<int>(list, "Take Only top two item");
}

TAKEWHILE () LINQ Method

Used to take items from a list based on the given condition. It iterates sequentially and checks each and every item, if a condition

is satisfied then it adds to a collection to the specific count.

/// <summary>
/// This is used to take Top 'N' items based on the given condition.
/// </summary>
public static void LinqInTakeWhile()
{
List<int> list = GetNumberList();

//This takes item if the element is less than 77 and eliminate others.
//ToList() helps to convert IEnumerable to List.
list = list.TakeWhile(i => i < 77).ToList();
//Print
PrintLis<int>(list, "Take items less than 77");
//This takes item if the element is less than 22 and eliminate others.
//ToList() helps to convert IEnumerable to List.
list = list.TakeWhile(i => i < 22).ToList();
//Print
PrintLis<int>(list, "Take items less than 22");
}

SKIP () LINQ Method

Used to skip the top items based on the given count.

/// <summary>
/// This is used to Skip Top 'N' items form the list.
/// </summary>
public static void LinqInSKIP()
{
List<int> list = GetNumberList();
//This SKIPS the Top two items from the list and keep remaining.
//"2" in param indicates how much item you need to skip.
//ToList() helps to convert IEnumerable to List.
list = list.Skip(2).ToList();
//Print
PrintLis<int>(list, "Skips top two item");
}

SKIPWHILE () LINQ Method

Used to skip items from the list based on the given condition.

It checks each and every item sequentially and if a condition is true then it skips the items up to where the condition turns false.

/// <summary
/// This is used to Skip Top 'N' items form the list based on the given conditon.
///</summary>
public static void LinqInSKIPWhile()
{
List<int> list = GetNumberList();
//This SKIPS upo the item equals to 11.
//Sequence check if any item not equal to 11, it return default list.
//ToList() helps to convert IEnumerable to List.
list = list.SkipWhile(i => i == 11).ToList();

//Print
PrintLis<int>(list, "Skips the item upto it equals to 11");
}