Comparing Japanese Characters in C#

Question

I am checking a Japanese string for spaces and replace them with "_". This is what I am doing:

string input1="abc  dfg";
string input2="尾え　れ";
if(input1.Contains(" "))
{
  Console.WriteLine(input1.Replace(" ","_"));
}
Console.WriteLine("------------------");
if(input2.Contains(" "))
{
  Console.WriteLine(input2.Replace(" ","_"));
}

Here is the Output on this code

abc__dfg
------------------

It replaces spaces with "_" in the simple English string but in the Japanese string it does not.

Answer 1

because the look-like-space in your input2 is not really a space, just check the ascii code of it

Console.WriteLine(Convert.ToInt32('　')); // output: 12288
Console.WriteLine(Convert.ToInt32(' ')); // output: 32

string input1 = "abc  dfg";
string input2 = "尾え　れ"; // a space
string input3 = "尾え れ"; // not a space
if (input1.Contains(" "))
{
    Console.WriteLine(input1.Replace(" ", "_"));
}
Console.WriteLine("------------------");
if (input2.Contains("　"))
{
    Console.WriteLine(input2.Replace("　", "_"));
}
Console.WriteLine("------------------");
if (input3.Contains(" "))
{
    Console.WriteLine(input3.Replace(" ", "_"));
}

---

@Ronan Thibaudau's original explanation:

Because it's not a space, it's not the same character, copy what you call a "space" from the input 2 string and paste it in the input2.replace method and it will work, it's just not the same character as the space you typed (even when i try to select it here on stackoverflow it's twice as large as the spaces in your input1 so it can't be the same character)

Answer 2

If you don't want to worry yourself with ASCII code or copy-pasting characters you don't know how to expect, just do something like this:

//using System.Linq;
string input1 = "abc  dfg";
string input2 = "尾え　れ";
if (input1.Any(char.IsWhiteSpace))
{

   Console.WriteLine(new string(input1.Select(x=> char.IsWhiteSpace(x) ? '_' : x).ToArray()));
}
Console.WriteLine("------------------");
if (input2.Any(char.IsWhiteSpace))
{

     Console.WriteLine(new string(input2.Select(x => char.IsWhiteSpace(x) ? '_' : x).ToArray()));
}