A comprehensive guide to querying DynamoDB using the .NET SDK, covering core concepts like partition keys, sort keys, and GSIs. Explains the November 2025 multi-attribute composite key GSI feature that replaces brittle synthetic key patterns. Covers the three C# SDK abstraction levels (low-level client, document model, object persistence), Query vs Scan trade-offs, FilterExpression pitfalls, and cursor-based pagination. Includes practical C# code examples for each approach and guidance on when to use each.
Table of contents
PrerequisitesTable Of ContentsCore DynamoDB ConceptsSynthetic Keys — The Old WayMulti-Attribute GSIs — The New WayC# SDK OptionsQuerying a Multi-Attribute GSI From C#Query vs ScanFilter ExpressionsPaging Results and User InterfacesFinal Thoughts & ConclusionSort: