Difference between Select and ConvertAll in C#

Difference between Select and ConvertAll in C#

Both Select and ConvertAll are used to transform an enumerable sequence into a new sequence, but they differ in the following ways:

  1. Return Type: Select returns an IEnumerable<T> while ConvertAll returns a List<T>.

  2. Input Type: Select operates on any IEnumerable<T> while ConvertAll operates specifically on List<T>.

  3. Delegate Type: Select takes a Func<TSource, TResult> delegate while ConvertAll takes a Converter<TSource, TResult> delegate.

  4. Side Effects: Select does not modify the original sequence, while ConvertAll creates a new list that contains the transformed elements.

Here is an example to illustrate the difference between Select and ConvertAll:

 var numbers = new List<int> { 1, 2, 3, 4, 5 }; var squares1 = numbers.Select(x => x * x); // returns an IEnumerable<int> var squares2 = numbers.ConvertAll(x => x * x); // returns a List<int>

In the above example, both squares1 and squares2 contain the squares of the original numbers, but squares1 is an IEnumerable<int> while squares2 is a List<int>.

Examples

  1. "C# LINQ Select example"

    Code Implementation:

    // Description: Using LINQ Select in C# var numbers = new List<int> { 1, 2, 3, 4, 5 }; var squaredNumbers = numbers.Select(x => x * x).ToList();

  2. "C# ConvertAll example"

    Code Implementation:

    // Description: Using ConvertAll in C# var numbers = new List<int> { 1, 2, 3, 4, 5 }; var squaredNumbers = numbers.ConvertAll(x => x * x);

  3. "Difference between Select and ConvertAll in C#"

    Code Implementation:

    // Description: Illustrating the difference between Select and ConvertAll in C# // Using LINQ Select var numbers = new List<int> { 1, 2, 3, 4, 5 }; var squaredNumbers = numbers.Select(x => x * x).ToList(); // Using ConvertAll var squaredNumbersConvertAll = numbers.ConvertAll(x => x * x);

  4. "C# LINQ Select with index"

    Code Implementation:

    // Description: Using LINQ Select with index in C# var numbers = new List<int> { 1, 2, 3, 4, 5 }; var squaredNumbersWithIndex = numbers.Select((x, index) => new { Index = index, Square = x * x }).ToList();

  5. "C# ConvertAll with custom type conversion"

    Code Implementation:

    // Description: Using ConvertAll with custom type conversion in C# var stringNumbers = new List<string> { "1", "2", "3", "4", "5" }; var intNumbers = stringNumbers.ConvertAll(int.Parse);

  6. "C# LINQ Select with projection"

    Code Implementation:

    // Description: Using LINQ Select with projection in C# var persons = new List<Person> { new Person { Name = "Alice", Age = 25 }, new Person { Name = "Bob", Age = 30 } }; var names = persons.Select(p => p.Name).ToList();

  7. "C# ConvertAll with custom type conversion and mapping"

    Code Implementation:

    // Description: Using ConvertAll with custom type conversion and mapping in C# var stringNumbers = new List<string> { "1", "2", "3", "4", "5" }; var squaredNumbers = stringNumbers.ConvertAll(x => int.Parse(x) * int.Parse(x));

  8. "C# LINQ Select with anonymous type"

    Code Implementation:

    // Description: Using LINQ Select with anonymous type in C# var numbers = new List<int> { 1, 2, 3, 4, 5 }; var squaredNumbersWithInfo = numbers.Select(x => new { Number = x, Square = x * x }).ToList();

  9. "C# ConvertAll with Func delegate"

    Code Implementation:

    // Description: Using ConvertAll with Func delegate in C# var numbers = new List<int> { 1, 2, 3, 4, 5 }; var squaredNumbers = numbers.ConvertAll(new Func<int, int>(x => x * x));

  10. "C# LINQ Select with conditional projection"

    Code Implementation:

    // Description: Using LINQ Select with conditional projection in C# var numbers = new List<int> { 1, 2, 3, 4, 5 }; var squaredEvenNumbers = numbers.Where(x => x % 2 == 0).Select(x => x * x).ToList();

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