How to replace whole characters in a string as same characters in c#?

Question

Example:

string input = "super";
string rep = "a";

I want the output same charterers as per given input string length . The output should be " aaaaa ". I dont like to use own FOR or While loops logic, is there any alternatives to accomplish it.

Answer 1

Use the constructor

string output = new string('a', input.Length);

If you want to repeat a real string n-times, you could use Enumerable.Repeat :

string output = string.Join("", Enumerable.Repeat(rep, input.Length));

I use String.Join to concatenate each string with a specified seperator(in this case none).

Answer 2

By Using Regular Expressions

string input = "123";
string rep = "Abc";
string output = Regex.Replace(input , "(.)", rep)

By using LINQ

string output = string.Concat(input.Select(c => rep));

Output

AbcAbcAbc

Answer 3

只是为了好玩，这是另一种方式：

new string(input.Select(c => 'a').ToArray());

Answer 4

another way :

string input = "super";
string rep = "a";
var newStr = input.Select(x => rep);

Answer 5

Of if you want a solution that's way to big but very easy to understand:

string output = "";
foreach(char a in input) {    // == for(int i = 0; i < input.length; i++) {
    output += rep;
}

I didn't know about working with the constructor.
It's a very easy solution, but it'll only work with char's. So you can't repeat strings.

Answer 6

string op = "";
for(int i = 0; i < input.Length; i++)
   op += rep;