Conversions, Operators, Aggregations & Quantifiers in LINQ C# 11 | Advance LINQ Course | Lecture 9

Описание: Language-Integrated Query (LINQ) is a powerful feature in C# 11 that allows developers to query data from various sources using a common syntax. LINQ operates on objects that implement IEnumerable or IQueryable interfaces, which includes collections such as arrays, lists, and dictionaries. In LINQ, there are several important concepts to understand, including conversions, operators, aggregations, and quantifiers.

Conversions refer to the process of transforming one data type into another. Conversions are achieved using conversion operators in LINQ. Some of the commonly used conversion operators include Cast, OfType, ToArray, ToList, and ToDictionary. Cast operator converts a collection of objects to a collection of a specified type. OfType filters the elements of a collection based on a specified type. ToArray converts a collection to an array. ToList converts a collection to a list, and ToDictionary converts a collection to a dictionary.

Operators in LINQ are used to perform operations on data sets, such as filtering, sorting, and grouping. Some of the commonly used operators include Where, OrderBy/OrderByDescending, Select, GroupBy, and Join. Where operator filters a collection based on a specified condition. OrderBy/OrderByDescending sorts a collection in ascending or descending order. Select operator projects a collection into a new form. GroupBy operator groups a collection based on a specified key. Join operator combines two collections based on a specified condition.

Aggregations in LINQ are used to calculate summary values from a collection of data. Some of the commonly used aggregations include Count, Sum, Average, Min, and Max. Count aggregation returns the number of elements in a collection. Sum aggregation calculates the sum of a collection of numeric values. Average aggregation calculates the average of a collection of numeric values. Min aggregation returns the minimum value in a collection, and Max aggregation returns the maximum value in a collection.

Quantifiers in LINQ are used to check if any element in a collection satisfies a specified condition. Some of the commonly used quantifiers include Any and All. Any quantifier checks if any element in a collection satisfies a specified condition. All quantifier checks if all elements in a collection satisfy a specified condition.

In summary, LINQ in C# 11 provides developers with a powerful and efficient way to query data from various sources using a common syntax. Conversions, operators, aggregations, and quantifiers are essential concepts in LINQ that enable developers to manipulate and transform data sets efficiently.



Chapters:
0:00 Introduction
0:07 Conversion Functions
3:07 Element Operators
5:19 Aggregation Functions
6:22 Quantifiers




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