How do I convert a single char to a string?
C#StringCastingCharC# Problem Overview
I'd like to enumerate a string
and instead of it returning chars
I'd like to have the iterative variable be of type string
. This probably isn't possible to have the iterative type be a string
so what is the most efficient way to iterate through this string?
Do I need to create a new string
object with each iteration of the loop or can I perform a cast somehow?
String myString = "Hello, World";
foreach (Char c in myString)
{
// what I want to do in here is get a string representation of c
// but I can't cast expression of type 'char' to type 'string'
String cString = (String)c; // this will not compile
}
C# Solutions
Solution 1 - C#
Use the .ToString() Method
String myString = "Hello, World";
foreach (Char c in myString)
{
String cString = c.ToString();
}
Solution 2 - C#
You have two options. Create a string
object or call ToString
method.
String cString = c.ToString();
String cString2 = new String(c, 1); // second parameter indicates
// how many times it should be repeated
Solution 3 - C#
With C# 6 interpolation:
char ch = 'A';
string s = $"{ch}";
This shaves a few bytes. :)
Solution 4 - C#
It seems that the obvious thing to do is this:
String cString = c.ToString()
Solution 5 - C#
Create a new string from the char.
String cString = new String(new char[] { c });
or
String cString = c.ToString();
Solution 6 - C#
Create an extension method:
public static IEnumerable<string> GetCharsAsStrings(this string value)
{
return value.Select(c =>
{
//not good at all, but also a working variant
//return string.Concat(c);
return c.ToString();
});
}
and loop through strings:
string s = "123456";
foreach (string c in s.GetCharsAsStrings())
{
//...
}
Solution 7 - C#
Did you try:
String s = new String(new char[] { 'c' });
Solution 8 - C#
String cString = c.ToString();
Solution 9 - C#
Why not this code? Won't it be faster?
string myString = "Hello, World";
foreach( char c in myString )
{
string cString = new string( c, 1 );
}
Solution 10 - C#
> probably isn't possible to have the iterative type be a string
Sure it is:
foreach (string str in myString.Select(c => c.ToString())
{
...
}
Any of the suggestions in the other answers can be substituted for c.ToString()
. Probably the most efficient by a small hair is c => new string(c, 1)
, which is what char.ToString()
probably does under the hood.
Solution 11 - C#
you can use + with empty string ""
, please check the below code:
char a = 'A';
//a_str is a string, the value of which is "A".
string a_str = ""+a;