Linq list of lists to single list in C#

Linq list of lists to single list in C#

In C#, you can use LINQ to flatten a list of lists into a single list. Here's an example:

 List<List<int>> listOfLists = new List<List<int>>() { new List<int>() { 1, 2, 3 }, new List<int>() { 4, 5, 6 }, new List<int>() { 7, 8, 9 } }; List<int> flattenedList = listOfLists.SelectMany(x => x).ToList();

In this example, we have a list of lists listOfLists containing three inner lists of integers. To flatten this list of lists into a single list, we use the SelectMany method from LINQ. The SelectMany method takes a lambda expression that maps each element in the outer list to a collection of inner elements, and then flattens all of these collections into a single output sequence.

In this case, the lambda expression x => x simply returns each inner list as is, and the SelectMany method flattens all of these lists into a single sequence of integers. We then call the ToList method on the output sequence to create a new list containing all of the flattened elements.

The resulting flattenedList in this example would contain the integers 1 through 9 in order.

Examples

1. "C# LINQ flatten list of lists"

  • Description: Flatten a list of lists into a single list using LINQ in C#.
  • Code:
    List<List<int>> listOfLists = GetListOfLists(); List<int> flattenedList = listOfLists.SelectMany(innerList => innerList).ToList();

2. "LINQ merge nested lists C#"

  • Description: Merge nested lists into a single list using LINQ in C#.
  • Code:
    List<List<int>> nestedLists = GetNestedLists(); List<int> mergedList = nestedLists.SelectMany(innerList => innerList).ToList();

3. "C# LINQ concatenate list of lists"

  • Description: Concatenate a list of lists into a single list using LINQ in C#.
  • Code:
    List<List<string>> listOfLists = GetListOfLists(); List<string> concatenatedList = listOfLists.SelectMany(innerList => innerList).ToList();

4. "LINQ join lists of lists C#"

  • Description: Join multiple lists of lists into a single list using LINQ in C#.
  • Code:
    List<List<char>> listOfLists = GetListOfLists(); List<char> joinedList = listOfLists.SelectMany(innerList => innerList).ToList();

5. "C# LINQ flatten 2D list"

  • Description: Flatten a 2D list into a single list using LINQ in C#.
  • Code:
    List<List<double>> twoDList = GetTwoDList(); List<double> flattenedList = twoDList.SelectMany(innerList => innerList).ToList();

6. "LINQ convert list of arrays to single list C#"

  • Description: Convert a list of arrays into a single list using LINQ in C#.
  • Code:
    List<int[]> listOfArrays = GetListOfArrays(); List<int> flattenedList = listOfArrays.SelectMany(array => array).ToList();

7. "C# LINQ flatten jagged array to list"

  • Description: Flatten a jagged array into a single list using LINQ in C#.
  • Code:
    int[][] jaggedArray = GetJaggedArray(); List<int> flattenedList = jaggedArray.SelectMany(innerArray => innerArray).ToList();

8. "LINQ concatenate nested lists C#"

  • Description: Concatenate nested lists into a single list using LINQ in C#.
  • Code:
    List<List<string>> nestedLists = GetNestedLists(); List<string> concatenatedList = nestedLists.SelectMany(innerList => innerList).ToList();

9. "C# LINQ merge 2D list"

  • Description: Merge a 2D list into a single list using LINQ in C#.
  • Code:
    List<List<int>> twoDList = GetTwoDList(); List<int> mergedList = twoDList.SelectMany(innerList => innerList).ToList();

10. "LINQ combine lists of different types in C#"

  • Description: Combine lists of different types into a single list using LINQ in C#.
  • Code:
    List<List<object>> listOfLists = GetListOfListsOfDifferentTypes(); List<object> combinedList = listOfLists.SelectMany(innerList => innerList).ToList();

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