How Can LINQ Be Used to Identify and Select Only Cars with Unique CarCodes?

Use LINQ to filter out cars with unique CarCode

In object collections, we often encounter situations where multiple members have the same attributes. In this case, individual differences need to be maintained and duplication prevented. Consider a collection of Car objects, each uniquely identified by its CarCode property. In a collection of multiple cars, some cars may share the same CarCode.

To obtain different results, LINQ (Language Integrated Query) provides an elegant solution. By using grouping and subsequent selection, it is possible to generate a new collection containing only cars with unique CarCode.

The following code effectively demonstrates this approach:

<code class="language-csharp">List<Car> distinctCars =
  cars
  .GroupBy(car => car.CarCode)
  .Select(g => g.First())
  .ToList();</code>

In this code, we first group the cars based on the CarCode value. This step will generate a collection of groups, each group representing a unique CarCode. Subsequently, we select the first car from each group, ensuring that only the first instance of each CarCode is included in the resulting distinctCars collection. By leveraging the power of LINQ, we can quickly transform our collections, remove duplicates and maintain uniqueness while maintaining data integrity.

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