Replacing string value in 2d array

Question

I'm trying to replace a string value in a 2d array and tried this codes below but nothing is happening

foreach (string item in Arr)
{
    if (UserInput.Equals(item))
    {
        item.Replace(UserInput, "X ");
    }
}

and the same goes for this codes nothing is happening...

Console.WriteLine("Select a seat that you want to ocupy");
string ln = Console.ReadLine();

if (ln.Equals(Arr))
{
    ln = ln.Replace(ln, "X ");
}

Can you please show the code that defines Arr. Is it a string[][] or a string[,]? — juharr
– juharr, Commented Oct 3, 2014 at 13:23
ln.Equals(Arr) Compares a string with an array and will always return false — vc 74
– vc 74, Commented Oct 3, 2014 at 13:24
here's the code string[,] Arr = new string[4,5] { {"A1" , " A2" , " A3" , " A4" , " A5"}, {"B1" , " B2" , " B3" , " B4" , " B5"}, {"C1" , " C2" , " C3" , " C4" , " C5"}, {"D1" , " D2" , " D3" , " D4" , " D5"}, };` — Josh
– Josh, Commented Oct 3, 2014 at 13:24

Dmitrii Bychenko · Accepted Answer · 2014-10-03 13:27:22Z

3

Your current code

  item.Replace(UserInput, "X ");

creates new String which you then ignore; it could have been something like

  item = item.Replace(UserInput, "X ");

However, that's impossible within foreach loop, so let's try for loops:

  String[,] Arr = new String[,] {
    {"A1", "A2", "A3", "A4"},
    {"B1", "B2", "B3", "B4"}
  };

  String UserInput = "B3";

  for(int line = Arr.GetLowerBound(0); line <= Arr.GetUpperBound(0); ++line)
    for(int column = Arr.GetLowerBound(1); column <= Arr.GetUpperBound(1); ++column)
      if (Arr[line, column].Contains(UserInput)) 
        Arr[line, column] = "X";

answered Oct 3, 2014 at 13:27

Dmitrii Bychenko

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Comments

libik · Accepted Answer · 2014-10-03 13:25:59Z

0

This should do the trick:

   string ln = Console.ReadLine();
   for (int i = 0; i < Arr.length; i++) {
        Arr[i] = Arr[i].Replace(ln, "X ");
   }

answered Oct 3, 2014 at 13:25

libik

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Comments

Sruit A.Suk · Accepted Answer · 2014-10-03 13:26:11Z

0

if (ln.Equals(Arr))
{
    ln = ln.Replace(ln, "X ");
}

What is Arr ? is it Array Object?

If it yes, You can't just make equals with the whole array

you need to check each of it by using for loop or something

for (int i=0, len = Arr.Length; i < len; i++ )
{
    if (ln.Equals(Arr[i]))
    {
        Console.WriteLine("old ln = " + ln);
        ln = ln.Replace(ln, "X ");
        Console.WriteLine("new ln = " + ln);
    }
}

answered Oct 3, 2014 at 13:26

Sruit A.Suk

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Comments

Sybren · Accepted Answer · 2014-10-03 13:30:43Z

0

Try this:

        string[,] Arr = new string[4, 5];
        string textToReplace = "test";
        for(int k=0;k < Arr.GetLength(0);k++)
         for(int l=0;l < Arr.GetLength(1);l++)
             if (Arr[k,l]==textToReplace){
                 Arr[k, l] = "X";
             }

answered Oct 3, 2014 at 13:30

Sybren

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