what does the linq for each statement do?

The linq for each statement is an important part of the LINQ language extensions (Language Integrated Query) made available in .NET Framework 3.5 and higher. It provides developers with a convenient way of iterating over a collection of data and performing task on each one, such as modifying the items in the collection or adding items to a separate collection. Working with LINQ for Each enables developers to use concise and readable syntax compared to other looping actions.

Using the LINQ For Each statement, developers can loop over a collection of data and execute a statement or lambda expression on each object. The syntax is as follows:

collection. ForEach(action => { Action });

Where action is either a method that takes an item from the collection as input, or a lambda expression that describes what should be done with each item in the collection using inline code. The lambda expression can include conditionals to do different tasks depending on the item's properties, enabling complex conditional operations within the same loop.

An example of how this works would be to add items from a list into another list:

var originalList = new List {"cat", "dog", "bird"};

var newList = new List();

originalList.ForEach(item => { newList.Add(item); });

//newlist will contain cat,dog,bird

Using LINQ For Each helps increase developer productivity by providing an easy way to ensure that all elements of a loop are performed as expected–as opposed to having explicit loops attached with conditions could introduce errors if written incorrectly. It also enables developers to write less code than having nested loops or separate loops for different operations over a single collection of data.