How to Extract Unique Cars Based on CarCode Using LINQ?

Use LINQ to get vehicles with unique CarCode properties

Suppose you have a collection of cars, represented as List. Each car is uniquely identified by its CarCode property. However, some cars in the collection may have the same CarCode value, causing duplication. The goal is to utilize LINQ to convert this collection into a new list containing only cars with a unique CarCode property.

For this we can use a powerful combination of grouping and selection. The GroupBy operator classifies cars based on their CarCode, effectively splitting the collection into multiple groups where the cars in each group have the same CarCode. Next, we use the Select operator to retrieve the first car from each group. This step ensures that only one car representing each unique CarCode is included.

The following code demonstrates this approach:

<code class="language-c#">List<car> cars = new List<car>();

// 假设cars已初始化，可能包含重复的CarCode值

List<car> distinctCars =
    cars
    .GroupBy(car => car.CarCode)
    .Select(g => g.First())
    .ToList();</code>

By leveraging the power of these LINQ operators, we successfully obtained a list of cars characterized by different CarCode values.

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