Concat all strings inside a List<string> using LINQ

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Is there any easy LINQ expression to concatenate my entire List<string> collection items to a single string with a delimiter character?

What if the collection is of custom objects instead of string? Imagine I need to concatenate on object.Name.

By using LINQ, this should work;

string delimiter = ",";
List<string> items = new List<string>() { "foo", "boo", "john", "doe" };
Console.WriteLine(items.Aggregate((i, j) => i + delimiter + j));

class description:

public class Foo
{
    public string Boo { get; set; }
}

Usage:

class Program
{
    static void Main(string[] args)
    {
        string delimiter = ",";
        List<Foo> items = new List<Foo>() { new Foo { Boo = "ABC" }, new Foo { Boo = "DEF" },
            new Foo { Boo = "GHI" }, new Foo { Boo = "JKL" } };

        Console.WriteLine(items.Aggregate((i, j) => new Foo{Boo = (i.Boo + delimiter + j.Boo)}).Boo);
        Console.ReadKey();

    }
}

And here is my best :)

items.Select(i => i.Boo).Aggregate((i, j) => i + delimiter + j)

Python: Concatenate all elements in a list into a string and return it , Python Exercises, Practice and Solution: Write a Python program to concatenate all elements in a list into a string and return it. Home » c# » Concat all strings inside a List<string> using LINQ Concat all strings inside a List<string> using LINQ Posted by: admin November 9, 2017 Leave a comment

In .NET 4.0 or later versions:

String.Join(delimiter, list);

is sufficient.

Python String join() method, The join() method provides a flexible way to create strings from iterable objects. It joins each element of an iterable (such as list, string and tuple) by a string separator (the string on which the join() method is called) and returns the concatenated string. How to Concatenate strings inside a List using Lambda Expression in C# ? June 7, 2015 Senthil Kumar B CSharp No comments If you have a Generic list of type string in C# and you wish to concatenate the items of the list to a single string along with the delimiter character , one of the easiest way to do it is using LINQ or Lambda Expression .

This is for a string array:

string.Join(delimiter, array);

This is for a List<string>:

string.Join(delimiter, list.ToArray());

And this is for a list of custom objects:

string.Join(delimiter, list.Select(i => i.Boo).ToArray());

Python String join(), How do you concatenate strings in a list in Python? In this article, several methods to concatenate multiple lists in Java into a single list are discussed using plain Java, Java 8, Guava Library and Apache Commons Collections. 1. List.addAll() List.addAll(Collection) method concatenates all elements of the specified collection to the end of the list. We can use it inside a for-each loop to concatenate multiple lists as shown below:

using System.Linq;

public class Person
{
  string FirstName { get; set; }
  string LastName { get; set; }
}

List<Person> persons = new List<Person>();

string listOfPersons = string.Join(",", persons.Select(p => p.FirstName));

Splitting, Concatenating, and Joining Strings in Python – Real Python, How do I convert a string to a list of strings? Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. Concat all strings inside a List<string> using LINQ

Good question. I've been using

List<string> myStrings = new List<string>{ "ours", "mine", "yours"};
string joinedString = string.Join(", ", myStrings.ToArray());

It's not LINQ, but it works.

Python, Concatenating and Joining Strings. Concatenating With the + Operator; Going From a List to a String in Python With .join(). Tying It All Together. Watch Now This  To produce grammatical output in English there are 3 cases to consider when concatenating a list of strings: "A" "A and B" "A, B, and C. This can be accomplished using standard Java or Guava like below.

Python, Let's see how to concatenate two lists using different methods in Python. in the first list, so that first list would have all the elements in both lists and hence would numpy.concatenate() function | Python · Python - Concatenate string rows in  Concatenate list of string into single string using LINQ in c# More often you will need a list of strings from a single string with a Split method, not so often you need to get a single string from an IEnumerable of strings, but still those requirements exist form time to time.

Python Join Two Lists, Sometimes we come across this type of problem in which we require to leave each The task of zip function is concatenating the resultant string into a single list 

Concatenate strings in Python (+ operator, join, etc.), There are several ways to join, or concatenate, two or more lists in Python. Another way to join two lists are by appending all the items from list2 into list1, one 

Comments
  • Why linq and not string.Join() ?
  • string.Join is better but I think linq makes your code fun, that could be the why!
  • String.Join is better because it uses a StringBuilder and avoids the inherrent O(n^2) performance of repeated concatenation.
  • performance issues using LINQ ?
  • O(n^2) time strikes again.
  • If you can't see the Aggregate method, you need to add using System.Linq;
  • Problem is that above LinQ method does not work with empty or single-element list.
  • it will throw an InvalidOperationException in case items is empty.
  • why not just use string.join? Please accept Sedat's answer so that anyone in a rush doesn't choose this solution when Sedat's is the better choice.
  • I am all for LINQ solutions but this is more efficient than LINQ and the Aggregate() method.
  • much cleaner! worked great for me! string.Join(", ", accs.Select(x => x.AccountID).ToArray()),
  • @KonstantinSalavatov I had posted my answer before OP had clarified that it had to be in LINQ. It is still perfectly valid for anyone who bumps into this answer while looking for a "not-necessarily-LINQ" solution on Google. Regarding this answer "not useful" in that context is unfair.
  • This can also be used for things other than List<String>s and will call the ToString() method.