Uploaded byMD. Shohag Mia
Understanding LINQ in C#
The document provides an introduction to LINQ (Language Integrated Query) in C#, highlighting its purpose in retrieving data from various data sources such as databases and XML. It discusses the advantages of using LINQ, including quick development turnaround and ease of debugging, as well as its limitations like overhead for creating queries. Additionally, it covers lambda expressions and standard query operators while detailing LINQ to SQL integration for object management.
More Related Content
Similar to Understanding LINQ in C#
Understanding LINQ in C#
- 1. Understanding LINQLINQ inC# MD. Shohag Mia mdshohagmia14@outlook.com .NET Trainee at LICT Project, World Bank
- 2. Index • Introduction toLINQ • Why should we use LINQ? • LINQ architecture • Lambda Expression • Getting started with standard query operators • LINQ to objects • Getting started with LINQ to SQL integration
- 3. Introduction to LINQ •LINQ stands for Language Integrated Query • A query is an expression that retrieves data from a data source or database. • Retrieve data from different data source like an object collection, sql server database, xml & web service etc. • Syntax like- var students = dbContext.Students.ToList();
- 4. Why should weuse LINQ? LINQ enables us to work with different data sources using similar types of code styles like SQL Database, XML Documents and in-memory objects. Another benefit of using LINQ is that it provides intellisense and compile time error checking .
- 5. Advantage • Quick turnaround for development • Queries can be dynamically generated • Tables are automatically created into class • Columns are automatically created into properties • Relationship are automatically appeaded to classes • Lambda expressions are awesome • Data is easy to setup and use • Easy debugging & transformation (SQL Data to XML Data)
- 6. Limitations • There isan overhead for creating queries • Small data sets will take longer to build the query than execute • Table joins are very slow • Hard to understand advance queries using Expressions
- 7.
- 8. Lambda Expression C# 3.0(.NET3.5) introduced the lambda expression along with LINQ. In C# a lambda is a function that uses clear and short syntax like Parameters => Expression Example: var customers = dbContext.Customers.Where(c => c.City == "London");
- 9. There are over50 standard query operators available in LINQ that provide different functionalities like filtering, sorting, grouping, aggregation, concatenation, etc. Getting started with standard query operators
- 10. Standard Query Operatorsin Query Syntax
- 11. Three Parts ofa Query Operation
- 12. LINQ to Object •Native query syntax in C# , VB etc with IntelliSence Autocompletion. • Query operator can be used against any .net collection (Innumerable<T>) such as Select, Where, GroupBy, Join etc. • Lamda Expression.
- 13. Getting started withLINQ to SQL integration LINQ to SQL offers an infrastructure (run-time) for the management of relational data as objects. It is a component of version 3.5 of the .NET Framework and ably does the translation of language-integrated queries of the object model into SQL.
- 14.
- 15. Resources • https://docs.microsoft.com/en-us/dotnet/csharp/programming-guide/concepts/linq/getting-started-with- linq • https://msdn.microsoft.com/en-us/library/bb308959.aspx •https://docs.microsoft.com/en-us/dotnet/framework/data/adonet/sql/linq/
- 16.