LINQ Query
Duration : 00:01:00
The Data Source
The data source in ASP.NET Core is the origin of data, typically a database, collection, or external service, from which data is retrieved and manipulated.Example
var dbContext = new MyDbContext(); // Replace with your DbContext
var data = dbContext.MyEntities; // Represents the data source
The Query
A query in ASP.NET Core defines a set of operations to retrieve, transform, and filter data from a data source using LINQ (Language-Integrated Query).Example
var query = from item in data
where item.Price > 50
select item; // Defines a query
Query Execution
Query execution in ASP.NET Core involves invoking the actual data retrieval or processing from the data source, typically triggered by methods like ToList(), First(), or Single().Example
var result = query.ToList(); // Executes the query and retrieves data
Deferred Execution
In ASP.NET Core, LINQ queries are lazily executed, which means they are not executed until an operation like enumeration or materialization is performed, allowing for optimized performance.Example
var deferredQuery = data.Where(item => item.Quantity > 10); // Query is not executed here
foreach (var item in deferredQuery) { } // Query is executed when enumerating
Forcing Immediate Execution
To force immediate execution of a query and retrieve results, you can use methods like ToList(), ToArray(), or First().Example
var immediateQuery = data.Where(item => item.Category == "Electronics").ToList(); // Executes and retrieves data immediately
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