What is take in C#?

The Take() extension method returns the specified number of elements starting from the first element. Example: Take() in C#

What is IEnumerable in C sharp?

IEnumerable in C# is an interface that defines one method, GetEnumerator which returns an IEnumerator interface. This allows readonly access to a collection then a collection that implements IEnumerable can be used with a for-each statement.

What is enumerable in VB net?

The IEnumerable interface is implemented by classes that can return a sequence of values one item at a time. The advantage of returning data one item at a time is that you do not have to load the complete set of data into memory to work with it.

What is difference between FirstOrDefault and SingleOrDefault?

FirstOrDefault returns a first item of potentially multiple (or default if none exists). SingleOrDefault assumes that there is a single item and returns it (or default if none exists). Multiple items are a violation of contract, an exception is thrown.

What is a IEnumerator?

IEnumerator is an interface, which when implemented allows you to iterate through the list of controls. To implement it requires that you provide two methods – Reset to go back to the beginning of the list, and MoveNext to move forward, and Current to get the current item.

What is meant by enumerable?

Definitions of enumerable. adjective. that can be counted. synonyms: countable, denumerable, numerable calculable. capable of being calculated or estimated.

What does IEnumerable do in system.collections?

Remarks. IEnumerable is the base interface for all non-generic collections that can be enumerated. For the generic version of this interface see System.Collections.Generic.IEnumerable . IEnumerable contains a single method, GetEnumerator, which returns an IEnumerator. IEnumerator provides the ability to iterate through the collection by

Which is a function in the enumerable method?

The type of the elements of source. An IEnumerable to filter. A function to test each source element for a condition; the second parameter of the function represents the index of the source element. An IEnumerable that contains elements from the input sequence that satisfy the condition.

How does the aggregate method in IEnumerable work?

The Aggregate (IEnumerable , Func ) method makes it simple to perform a calculation over a sequence of values. This method works by calling func one time for each element in source except the first one.

How does the enumerable select method in Visual Basic work?

The query represented by this method is not executed until the object is enumerated either by calling its GetEnumerator method directly or by using foreach in Visual C# or For Each in Visual Basic. This projection method requires the transform function, selector, to produce one value for each value in the source sequence, source.