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LINQ in C#
- 1. LINQ in C# Concepts of Programming Languages Course 2016
- 2. What’s LINQ? Language Integrated Query LINQ is a query syntax built in C# and VB.NET used to save and retrieve data from different types of data sources like an Object Collection, SQL server database, XML, web service etc.
- 4. Advantages • Syntax highlighting • Easy debugging • Extensible that means it is possible to query new data source types. • Facility of joining several data sources in a single query • Easy transformation ( like transforming SQL data to XML data.)
- 6. LINQ OPERATORS • Known expressions used for specific purpose • Operators offer a range of query capabilities like filtering, sorting, projection, aggregation, etc.
- 7. LINQ OPERATORS • Filtering Operators • Grouping Operators • Concatenation • Sorting Operators • Join Operators • Equality • Projection Operations
- 8. LINQ OPERATORS Aggregation Quantifier Operations Partition Operations Generation Operations Set Operations Conversions Element Operators
- 9. LINQ Syntax Query Syntax Method Syntax
- 10. Query Syntax • Query syntax is similar to SQL (Structured Query Language) for the database. • It is defined within the C# • Query Syntax starts with from clause and can be end with Select or GroupBy clause.
- 11. Query Syntax Implicitly typed variable - var can be used to hold the result of the LINQ query. We use various operators like filtering, joining, grouping, sorting operators to construct the desired result.
- 14. (lamda) Method Syntax Method Syntax is like calling extension method already included. Implicitly typed variable - var can be used to hold the result of the LINQ query.
- 17. LINQ operators
- 18. Filtering Operators Filtering is an operation to restrict the result set such that it has only selected elements satisfying a particular condition.Where OfType
- 20. Grouping Operations The operators put data into some groups based on a common shared attributeGroupBy ToLookup
- 22. Concatenation Operations Performs concatenation of two sequences and is quite similar to the Union operator in terms of its operation except of the fact that this does not remove duplicates. Concat
- 24. Sorting Operators A sorting operation allows ordering the elements of a sequence on basis of a single or more attributes.OrderBy,OrderByDescending,
- 26. Equality Operations Compares two sentences (enumerable ) and determine are they an exact match or not. SequenceEqual
- 28. LINQ to Objects and Collections
- 29. LINQ to Objects LINQ to Objects offers a fresh approach to collections Before we had to write long coding (foreach loops of much complexity) for retrieval of data from a collection Now we write declarative code which clearly describes the desired data that is required to retrieve.
- 30. LINQ to Objects There are also many advantages of LINQ to Objects over traditional like • Readability • Powerful filtering • Capability of grouping • Enhanced ordering with minimal application coding.
- 31. LINQ to Objects
- 32. LINQ to Objects In the example, an array of strings (tools) is used as the collection of objects Queried using LINQ to Objects. The output will be .. Tablesaw Bandsaw Planer Jointer Drill Sander
- 33. Data Source Transformation (LINQ) is not only about retrieving data. We can use a source sequence as input and modify it in many ways to create a new output sequence.
- 34. Data Source Transformation We Can ... • Merge multiple input sequences into a single output sequence that has a new type. • Create output sequences whose elements consist of only one or several properties of each element in the source sequence. • Create output sequences whose elements consist of the results of operations performed on the source data. • Create output sequences in a different format. For example, you can transform data from SQL rows or text files into XML.
- 35. Joining Multiple Inputs into One Output Sequence
- 36. Joining Multiple Inputs into One Output Sequence
- 37. Joining Multiple Inputs into One Output Sequence
- 38. Joining Multiple Inputs into One Output Sequence Output will be… The following students and teachers live in Seattle: Omelchenko Beebe
- 39. Create output sequences whose elements consist of only one or several properties of each element in the source sequence. Select one member of the source element Create elements that contain more than one property from the source element
- 40. Create output sequences whose elements consist of the results of operations performed on the source data.
- 41. Create output sequences in a different format. We you can transform data from SQL rows or text files into XML.
- 44. Any Questions?
- 45. Thank You! LINQ in C# Presentation Concepts of Programming Languages Course 2016 Faculty of Computers and Information - Cairo University Presented By: Basant Mohamed Medhat - 20130102 Hanan Shaban Abdelmohsen - 20130113 Hager Gamal Hassan - 20130282
Editor's Notes
- #2: LINQ in C# Presentation - Concepts of Programming Languages Course 2016 Faculty of Computers and Information - Cairo University Presented By: Basant Mohamed Medhat - 20130102 Hanan Shaban Abdelmohsen - 20130113 Hager Gamal Hassan – 20130282 December 2016
- #44: http://www.tutorialspoint.com/linq/ https://msdn.microsoft.com/en-us/library/mt693042.aspx https://en.wikipedia.org/wiki/Language_Integrated_Query