Newbie! Search a string for a specific character?

hristo1977

Hi! This dont seem to work, any ideas? (Im sure you have lots of ideas, but remember Im a newbie) label1.Text += "."; string k = label1.Text; int r; r = label1.Text.IndexOf(k); if (r > 0) { MessageBox.Show("bla"); } so, r is never above 0 despite that the string contains a "."

Newbie untill I die! :-)

Ranjan Banerji

IndexOf returns a 0 based index. "." is not in position 1, it is in position 0. If nothing is found -1 is returned. Your code should be if( r != -1 )

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hristo1977

hi, and thanks for your fast answer. Im trying to program a calculator and you should not be able to hit "." multiple times in a row. So if I take this code: string k = label1.Text; int r; r = label1.Text.IndexOf(k); if (r != -1) { label1.Text += "."; MessageBox.Show("bla"); } And paste in under, for example, the button 9, I still get the msgbox! That should not happend, shouild it? Because now, there are no "." in the string...or Im missing someting here?

Newbie untill I die! :-)

Lost User

hristo1977 wrote:

string k = label1.Text; int r; r = label1.Text.IndexOf(k);

Wait, you take the contents of your textbox (k) and test (IndexOf(k)), if it exists? This will always return the index 0. What you probably want is IndexOf(".") regards

Judah Gabriel Himango

hristo1977 wrote:

Im trying to program a calculator and you should not be able to hit "."

Here's a simple way to determine if the period character exists multiple times in a string:

string text = label1.Text;
int periodCount = 0;
foreach(char character in text)
{
if(character == '.')
{
periodCount++;
}
}

if(periodCount > 1)
{
// There are multiple period characters in the string.
}

Tech, life, family, faith: Give me a visit. I'm currently blogging about: For Christians: The Significance of Yom Teruah The apostle Paul, modernly speaking: Epistles of Paul Judah Himango

hristo1977

Thanks a lot, Himango!

Newbie untill I die! :-)