C# LINQ Methods and Anonymous Types

List Object Methods

• The RemoveAt method is used to remove an element at a specific index from a List object.
• The Remove method is used to remove the first occurrence of a specific object from a List object.

List Object Properties

• The Count property returns the number of elements in a List object.
• The Capacity property indicates the number of items a List can hold without needing to grow.

Inserting Elements

• The Insert method is used to insert an element into a List at a specified index.
• The Insert method requires the index as its first argument.

Declaring a New List

• When declaring a new List, the placeholder T represents the type of elements the List will hold.

Modifying a List

• The Add method adds an element to the end of a List.
• When a new element is inserted in a List, the indices of elements after the insertion point are shifted upwards.

Removing Elements

• The Remove method removes the first occurrence of a specific object from a List object.
• The RemoveAt method removes the element at a specific index from a List object.

LINQ

• The Distinct extension method returns a sequence that contains no duplicate elements.
• The select clause is used to specify the type of values to retrieve or to perform a transformation on retrieved values.
• In LINQ, an example of a projection is when you use the select clause to transform or flatten a result set.

Anonymous Types

• Specifying a different name for a property inside an anonymous type definition allows the property to be referred to by that name.
• Implicitly typed local variables are related to using anonymous types, as they can be used to declare variables that will hold anonymous types.

LINQ Example

• A programmer can give all employees a 10% raise using LINQ by using the select clause to transform the employee data, multiplying their salaries by 1.1.