- With the Lambda syntax in place,…I want to add some functionality that I was not…able to access with comprehension syntax,…to specify an index when filtering.…Let's consider this large sequence…consisting of amount of money customers have spent…in three different currencies.…These are results from a cross product query…where the price properties for each customer…was multiplied with an exchange rate…to give the value in three different currencies:…euro, pound and yen.…I know that every third item in the list…corresponds to the same currency.…
I can use an indexed where query to pull one set…of currency values from the list.…In this case, I'm going to pull out all the values in yen.…I'll scroll back to my main program.…I'll start a new query with the name of my query…in a source sequence.…I'll introduce the range variable and the index variable…to the left of the Lambda symbol.…I know the third element and every third element after that…is also in yen, so I'll set the Lambda expression…to grab every third element in the sequence.…
Author
Released
11/30/2015In LINQ with C# Essential Training, engineer Olivia Chiu introduces techniques for querying, updating, and transforming data with LINQ. She covers standard queries—such as finding overlaps in two datasets and creating hierarchies—as well as complex chained queries. She also shows how to group and join LINQ queries with lambda expressions, and use LINQ to query SQL databases and XML documents. Last but not least, Olivia provides tips for optimizing the performance of your queries.
- Creating and executing a LINQ query
- Returning results
- Changing the data source type
- Performing standard queries
- Working with lambda expressions
- Chaining and complex queries
- Querying SQL and XML
- Performing tree queries
- Using sequences, elements, and scalars
- Allocating memory
Skill Level Intermediate
Duration
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Introduction
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Welcome51s
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Use the exercise files1m 6s
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1. Introduction to LINQ
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Common use cases1m 45s
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2. Basic LINQ Queries
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Select a data source3m 6s
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Create a query1m 33s
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Execute a query1m 56s
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3. Data Transformation
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Return results as a new type1m 39s
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4. Type Relationships
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5. Standard Queries
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Parse basic groups4m 30s
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Create hierachy in a dataset3m 50s
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6. Lambda Expressions
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Lambda expressions3m 25s
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Index and distinct operators2m 22s
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Take and skip operators2m 47s
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7. Complex Queries
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Chaining2m 9s
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Use the into keyword3m 45s
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Use the let keyword3m 4s
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8. LINQ to SQL
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Database setup3m 58s
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Database query1m 48s
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Database updates2m 56s
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9. LINQ to XML
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Tree creation4m 10s
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Tree queries1m 43s
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10. Other Operators
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11. Performance
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Memory allocation1m 54s
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Best practices1m 40s
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Conclusion
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Next steps44s
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Video: Index and distinct operators