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Query Shaping - EF Core Practical Data Access Labs | Aporeon

EF Core Practical Data Access Labs

Query Shaping

DTO projections, N plus one fixes, optional filters, keyset pagination, and deliberate split queries.

5 drillsPractice one at a timeOrdered pathCoding problem

Recommended start

Order DTO Projection

Builds a read-only EF Core projection with aggregates, stable ordering, and bounded results instead of loading an entity graph.

Easy~15 minStep 1 of 5

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1Order DTO ProjectionRecommended startBuilds a read-only EF Core projection with aggregates, stable ordering, and bounded results instead of loading an entity graph.Coding problemEasy~15 min.NETASP.NET CoreC#Practice

Practice order

5 drillsOne at a time

1Order DTO ProjectionUp next / Easy / ~15 min
2Refactor N Plus OneMedium / ~25 min
3Composable FiltersEasy / ~15 min

2

Refactor N Plus OneReplaces a parent query plus one status query per row with one server-side projection.Coding problemMedium~25 min.NETASP.NET CoreC#

Practice

3Composable FiltersBuilds optional EF Core predicates while preserving server translation, stable ordering, and a bounded result.Coding problemEasy~15 min.NETASP.NET CoreC#Practice

4EF Keyset PageImplements descending keyset pagination in LINQ using a compound timestamp-and-id cursor.Coding problemMedium~25 min.NETASP.NET CoreC#Practice

5Tracked Split QueryUses `AsSplitQuery` deliberately for a tracked aggregate with multiple collections and explains its consistency boundary.Coding problemMedium~25 min.NETASP.NET CoreC#Practice

4EF Keyset Page

Medium / ~25 min

5Tracked Split QueryMedium / ~25 min