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Guide to NoSQL with Azure Cosmos DB

You're reading from   Guide to NoSQL with Azure Cosmos DB Work with the massively scalable Azure database service with JSON, C#, LINQ, and .NET Core 2

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Product type Paperback
Published in Sep 2018
Publisher Packt
ISBN-13 9781789612899
Length 214 pages
Edition 1st Edition
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Authors (2):
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Gaston C. Hillar Gaston C. Hillar
Author Profile Icon Gaston C. Hillar
Gaston C. Hillar
Daron Yöndem Daron Yöndem
Author Profile Icon Daron Yöndem
Daron Yöndem
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Table of Contents (9) Chapters Close

Preface 1. Introduction to NoSQL in Cosmos DB 2. Getting Started with Cosmos DB Development and NoSQL Document Databases FREE CHAPTER 3. Writing and Running Queries on NoSQL Document Databases 4. Building an Application with C#, Cosmos DB, a NoSQL Document Database, and the SQL API 5. Working with POCOs, LINQ, and a NoSQL Document Database 6. Tuning and Managing Scalability with Cosmos DB 7. Answers 8. Other Books You May Enjoy

Writing LINQ queries that perform operations on arrays


The following lines declare the code for the ListFinishedCompetitionsFirstWinner asynchronous static method. This method builds a LINQ query to retrieve the winner with the first position for all the finished competitions. The competitions are filtered to include only those that allowed the platform received as an argument and that are located in the zip code received as a parameter. The query restricts the location's zip code value, and therefore, it is a single-partition query.

Add the following lines to the existing code of the Program.cs file. The code file for the sample is included in the learning_cosmos_db_05_01 folder in the SampleApp2/SampleApp1/Program.cs file:

private static async Task ListFinishedCompetitionsFirstWinner(GamingPlatform gamingPlatform, string zipCode) 
{ 
    // Retrieve the winner with the first position for all the finished competitions  
    // that allowed the platform received as an argument 
    // and...
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