Fastest way to convert List<int> to List<int?> in C#

Fastest way to convert List<int> to List<int?> in C#

To convert a List<int> to a List<int?>, you can use LINQ's Select method and the Nullable<int> constructor. Here is an example:

List<int> intList = new List<int> { 1, 2, 3, 4, 5 }; List<int?> nullableIntList = intList.Select(i => (int?)i).ToList();

In this example, the Select method takes a lambda expression that converts each int in the intList to a nullable int using the (int?) constructor. The resulting sequence of nullable ints is then converted to a List<int?> using the ToList method.

Examples

  1. "C# convert List<int> to List<int?> using LINQ"

    List<int> intList = /* your List<int> */; List<int?> nullableIntList = intList.Select(i => (int?)i).ToList();

    Description: Utilizes LINQ to project each element in the List<int> to a nullable integer (int?).

  2. "Fastest way to convert List<int> to List<int?> with For Loop in C#"

    List<int> intList = /* your List<int> */; List<int?> nullableIntList = new List<int?>(intList.Count); for (int i = 0; i < intList.Count; i++) { nullableIntList.Add(intList[i]); }

    Description: Uses a traditional for loop to iterate through the List<int> and populate a new List<int?>.

  3. "C# convert List<int> to List<int?> with ConvertAll"

    List<int> intList = /* your List<int> */; List<int?> nullableIntList = intList.ConvertAll(i => (int?)i);

    Description: Uses the ConvertAll method to convert each element in the List<int> to a nullable integer (int?).

  4. "Optimized way to convert List<int> to List<int?> in C#"

    List<int> intList = /* your List<int> */; List<int?> nullableIntList = new List<int?>(intList.Count); nullableIntList.AddRange(intList.Select(i => (int?)i));

    Description: Optimized approach using AddRange to efficiently add elements to the new List<int?>.

  5. "C# convert List<int> to List<int?> with Select and ToList"

    List<int> intList = /* your List<int> */; List<int?> nullableIntList = intList.Select(i => (int?)i).ToList();

    Description: Uses Select to project each element and then ToList to create the new List<int?>.

  6. "C# convert List<int> to List<int?> with ForEach Loop"

    List<int> intList = /* your List<int> */; List<int?> nullableIntList = new List<int?>(intList.Count); intList.ForEach(i => nullableIntList.Add(i));

    Description: Applies a ForEach loop to iterate through the List<int> and populate the new List<int?>.

  7. "Convert List<int> to List<int?> with C# Nullable"

    List<int> intList = /* your List<int> */; List<int?> nullableIntList = intList.ConvertAll(i => new int?(i));

    Description: Uses the Nullable constructor to explicitly create nullable integers during the conversion.

  8. "C# convert List<int> to List<int?> with Select and Nullable"

    List<int> intList = /* your List<int> */; List<int?> nullableIntList = intList.Select(i => new int?(i)).ToList();

    Description: Utilizes Select and the Nullable constructor to perform the conversion.

  9. "C# convert List<int> to List<int?> with Parallel.ForEach"

    List<int> intList = /* your List<int> */; List<int?> nullableIntList = new List<int?>(intList.Count); System.Threading.Tasks.Parallel.ForEach(intList, i => nullableIntList.Add(i));

    Description: Leverages Parallel.ForEach for parallel processing during the conversion of each element.

  10. "C# convert List<int> to List<int?> with Expression Trees"

    List<int> intList = /* your List<int> */; List<int?> nullableIntList = intList.Select(i => (int?)i).ToList();

    Description: Uses LINQ and expression trees to project each element in the List<int> to a nullable integer (int?).

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