Join Olivia Chiu Stone for an in-depth discussion in this video Queries that use the source type, part of LINQ with C# Essential Training.
- For LINQ query to compile successfully,…the type of variables used in the query…must be compatible with the types of the source elements…and or the properties of the elements.…When you execute a query, the variable used…in the foreach statement, must also be compatible…with the source data and the LINQ query variables.…In this example query,…there are no transformations to the data.…All it does is take a subset from the source…and returns that subset.…There are three pieces in this query…that lead to no transformation in the resulting sequence.…
First the type of the source, in this case,…a list of customer objects, determines the type…for the range variable cust in the query.…Therefore, the type for the range variable…is the customer object.…Second, the data type of the resulting sequence…determines the type of the query variable.…In this case, the select class…asks to return their customer elements…that satisfy the query above it.…In this case, the customers that reside in Oregon…make up the resulting sequence.…
Author
Olivia Chiu 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
Views
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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: Queries that use the source type