How to combine two list in linq c#?

How to combine two list in linq c#?

var mergedList = list1. Union(list2). ToList(); This will return a List in which the two lists are merged and doubles are removed.

How do you create a union list in C#?

Use of Union

  1. List collectionOne = new List() { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };
  2. List collectionTwo = new List() { 1, 2, 3, 11, 12, 13, 14, 15 };
  3. var unionResult = collectionOne.Union(collectionTwo);
  4. foreach (var item in unionResult)
  5. {
  6. Console.Write(item +” “);
  7. }

Does Linq Union remove duplicates?

Linq, acts upon 2 collections. It returns a new collection that contains the elements that are found. Union removes duplicates. So this method can be thought of as two actions: it combines the two collections and then uses Distinct() on them, removing duplicate elements.

Can we use LINQ query in a list object?

Using LINQ to Objects. The term LINQ to Objects refers to the use of LINQ queries to access in-memory data structures. You can query any type that supports IEnumerable. This means that you can use LINQ queries not only with user-defined lists, arrays, dictionaries, and so on, but also in conjunction with .

How do you sort a list in C#?

C# List Sort method

  1. Sort(Comparison) – Sorts the elements in the entire List using the specified Comparison.
  2. Sort(Int32, Int32, IComparer) – Sorts the elements in a range of elements in List using the specified comparer.
  3. Sort() – Sorts the elements in the entire List using the default comparer.

How do you use select many?

SelectMany() method For example, SelectMany() can turn a two-dimensional array into a single sequence of values, as shown in this example: int[][] arrays = { new[] {1, 2, 3}, new[] {4}, new[] {5, 6, 7, 8}, new[] {12, 14} }; // Will return { 1, 2, 3, 4, 5, 6, 7, 8, 12, 14 } IEnumerable result = arrays.

How does union work C#?

LINQ Union operator is used for finding unique elements between two sequences (Collections). For example, suppose we have two collections A = { 1, 2, 3 }, and B = { 3, 4, 5 }. Union operator will find unique elements in both sequences. So union operator only takes one element in the result.

What is the difference between union and concat in LINQ?

3 Answers. Union removes duplicates. Concat does not. So, they produce different results if the sources either contain any items in common, or have any internal duplicates.

Does concat remove duplicates C#?

This method excludes duplicates from the return set. This is different behavior to the Concat method, which returns all the elements in the input sequences including duplicates.

What is Parallel LINQ?

Parallel LINQ (PLINQ) is a parallel implementation of the Language-Integrated Query (LINQ) pattern. PLINQ implements the full set of LINQ standard query operators as extension methods for the System. PLINQ combines the simplicity and readability of LINQ syntax with the power of parallel programming.

Is LINQ faster than foreach?

4 Answers. LINQ will usually be faster when it can take advantage of deferred execution; as it does here. Use LINQ when you are running queries and operations where deferred execution will get you a performance benefit. When that query returns a collection, use foreach to iterate over it.