get char position in textBox

Question

I am trying to get the index of a each char in the text "ABCDCEF" (textBox.text). The problem is that the first 'C' index is 2 and the second C index is 4 but the second 'C' index in the result is 2 too.

This is the code:

        foreach (char character in textBox1.Text)
        {
             MessageBox.Show(character + " - " + textBox1.Text.IndexOf(character));
        }

Result:

char - index

A - 0

B - 1

C - 2

D - 3

C - 2

E - 5

F - 6

The correct result should be:

char - index

A - 0

B - 1

C - 2

D - 3

C - 4

E - 5

F - 6

Why it's happening?

Thanks

Its because you need to increase your startIndex in each iteration! — Jesus Angulo, Jun 05 '16 at 03:39
As Jesus said. Have a look at [Get index of next same character](http://stackoverflow.com/questions/23633861/get-index-of-next-same-character) — Tone, Jun 05 '16 at 03:41
@Tone the way said it I thought you meant Christ! I hadn't seen the comment above though... — Angel Politis, Jun 05 '16 at 03:47

score 2 · Answer 1 · answered Jun 05 '16 at 03:42

2

string.IndexOf returns first occurrence of a character, that's why it returns index 2 for c lookup.

MSDN Says,

Reports the zero-based index of the first occurrence of a specified Unicode character or string within this instance. The method returns -1 if the character or string is not found in this instance.

You could convert it to for loop and get index for each character.

for(int i=0;i<textBox1.Text.Length;i++)
{
    MessageBox.Show(textBox1.Text[i] + " - " + i); 
}

answered Jun 05 '16 at 03:42

Hari Prasad

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I tried to insert a separator with for loop but did not work. This is the code: for (int i = 0; i < 10; i++) { if (char.IsUpper(textBox1.Text[i])) textBox1.Text = textBox1.Text.Insert(i, " | "); } – Eduardo Angelim Jun 05 '16 at 13:50

get char position in textBox

1 Answers1