Join Olivia Stone for an in-depth discussion in this video Select a data source, part of LINQ with C# Essential Training.
- Every LINQ query has three parts to its basic structure.…LINQ query begins with a data source.…The data source consists of a sequence of elements.…The sequence needs to be something…that can be iterated over using a foreach statement…such as an array or a list.…The elements in the sequence…can be of any type of data.…So an array of integers,…or a series of characters,…or a list of objects can all be…the data source for a LINQ query.…This is a declaration for query called state query.…
I'll go into detail about the type of state query later.…For now, I'll focus on the LINQ query specification.…The from clause is used to introduce the data source…or sequence to use in the query.…In this example, the data source is a list…of customer objects representing…the customers for a company.…Cust acts as a range variable.…This is similar to the interation variable…in a foreach statement.…However, in this case, the sequence will not be…iterated over at this point in the program.…When the query executes,…the range variable will be used to…
Author
Olivia Stone
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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Welcome55s
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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: Select a data source