Concatenate multiple string using string interpolation in c#

Question

The code I tried:

public void ConcatIntegers() {
  string s = "";

  for (int i = 0; i <= 5; i++) {
    s += i.ToString();
  }

  Console.WriteLine($ "{s}");
  Console.Read();
}

In Above method + is used to concatenate multiple values but I was looking for anyway except join, aggregate, concatenate function, instead of + symbol I want to use string interpolation ($) directly which store concatenated string into a string variable.

string s = "";

for (int i = 0; i <= 5; i++) {
  // Some code which use string interpolation to 
  // concatenat multiple string and that result is stored in s 
  // variable.
}

Console.WriteLine($ "{s}");
Console.Read();

What language is this? I know of no language which has the keyword Public (with that casing!). Please read about how to ask good questions, as well as this question checklist. — Some programmer dude
– Some programmer dude, Commented Oct 2, 2018 at 6:22
@prashant ,We use + operator to concatenate multiple strings which i shown in "The code I tried". Instead of that code I want to use string interpolation which helps concatenate multiple string and my code will be readable. — Beginner
– Beginner, Commented Oct 2, 2018 at 6:43
Use string builder to concat strings due to huge performance difference. — UbuntuCore
– UbuntuCore, Commented Oct 2, 2018 at 6:45
String interpolation doesn't concatenate, it formats a string with parameters. In essense it's an easier way to write String.Format. Since s is a string using interpolation here is meaningless — Panagiotis Kanavos
– Panagiotis Kanavos, Commented Oct 2, 2018 at 7:12

valerysntx · Accepted Answer · 2018-10-02 08:18:29Z

1

except join, aggregate, concatenate function, instead of + symbol I want to use string interpolation ($)

directly which store concatenated string into a string variable...

simply try:

string result = string.Empty;
for (var i = 0; i <= 5; i++) result = $"{result}{i}";

edited Oct 2, 2018 at 8:18

answered Oct 2, 2018 at 8:10

valerysntx

5243 silver badges7 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

Itamar Kerbel · Accepted Answer · 2018-10-02 06:49:27Z

1

Use StringBuilder since if you do that a lot it is much faster Use AppendFormat

StringBuilder sb = new StringBuilder();
string var1   = "abcd";
string var2   = "efgh";
sb.AppendFormat("example: {0}, {1}", var1, var2);

answered Oct 2, 2018 at 6:49

Itamar Kerbel

2,5962 gold badges23 silver badges30 bronze badges

Comments

Dmitrii Bychenko · Accepted Answer · 2018-10-02 07:07:26Z

1

If you want to concatenate, let's try string.Concat or string.Join; with a little help of Linq (in order to get rid of for loop) we'll get

  using System.Linq;

  ...

  // static: we don't use "this" in the method
  public static void ConcatIntegers() {
    // Concatenate range of 0..5 integers: "012345"
    Console.WriteLine(string.Concat(Enumerable
      .Range(0, 6))); // 6 - we want 6 numbers: 0..5

    Console.Read();
  }

In case you want to use some format, string interpolation etc. add Select:

 public static void ConcatIntegers() {
   // "000102030405" since we apply "d2" format (each number reprsented with 2 digits)
   Console.WriteLine(string.Concat(Enumerable
     .Range(0, 6)
     .Select(i => $"{i:d2}"))); // each item in 2 digits format

   Console.Read();
 }

edited Oct 2, 2018 at 7:07

answered Oct 2, 2018 at 7:02

Dmitrii Bychenko

188k20 gold badges178 silver badges231 bronze badges

Comments

Prashant Pimpale · Accepted Answer · 2025-07-23 05:44:40Z

1

I would use StringBuilder to concatenate the string:

Your code after changes:

StringBuilder sb = new StringBuilder();
            
string s = "";
sb.Append(s);
for (int i = 0; i <= 5; i++)
{
   sb.Append(i);
}

Console.WriteLine(sb);
Console.ReadLine();

edited Jul 23 at 5:44

answered Oct 2, 2018 at 6:52

Prashant Pimpale

10.7k10 gold badges52 silver badges88 bronze badges

Comments

AMIT SHELKE · Accepted Answer · 2020-08-12 07:42:34Z

-1

I had a similar issue on using string interpolation in string.join

        string type1 = "a,b,c";
        string[] type2 = new string[3] { "a", "b", "c" };
        
        string result = string.Join(",", $"'{x}'");

In both cases, the output should be 'a','b','c'

how to use string.Join() with string interpolation for array of strings

answered Aug 12, 2020 at 7:42

AMIT SHELKE

5313 gold badges14 silver badges38 bronze badges

Collectives™ on Stack Overflow

Concatenate multiple string using string interpolation in c#

5 Answers 5

Comments

Comments

Comments

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

5 Answers 5

Comments

Comments

Comments

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related