Search a for values in a string

Glenn Patton

Hi All,

I'm looking for a good method of searching a string for a value, if the string was all numbers I would use a Convert.ToInt16() (or 32 depending on value) but this time the string in question is "2.08.08" if this is Converted with a ToInt() method it will error as the decimal is used twice.
The reason I can't use a substring() method to chop off the first is it is a version number so all the digits are important. I could use a foreach loop to remove the stops and then convert the string (2.08.08 would become 20808) and use it like that:

foreach (string subString in USB_Version.Split(Stop))

{

output += subString + ";";

count++;

if (count == 3)

{

Version_Number = subString;

break;

}
Would this be good method or is there (as usual) a method I am not aware of??
Glenn

6 Replies

Know the answer? Post it — somebody with the same question will find it here.

Vulpes14y ago
Accepted answer
If you want to isolate all three components of the version individually, then you can use the String.Split method with '.' as the separator and then convert the resulting array of strings to an array of ints.

However, if you don't need the individual components, then you can simply use String.Replace to replace the dots with empty strings.
Glenn Patton14y ago
That's pretty much my what I had. (I am learning something!!) Thanks Glenn
Glenn Patton14y ago
That's pretty much my what I had. (I am learning something!!) Thanks Glenn
Vulpes14y ago
Yes, here's my suggested code (untested):

private void button1_Click(object sender, EventArgs e)
{
string CheckAgainst = "2.08.08";
const string Stop = ".";
CheckAgainst = CheckAgainst.Replace(Stop, "");
string Checkee = textBox1.Text.Trim().Replace(Stop, "");
int intCheckAgainst = int.Parse(CheckAgainst);
int intCheckee;
int.TryParse(Checkee, out intCheckee); // intCheckee will be 0 if input is invalid

if (intCheckee == intCheckAgainst)
{
MessageBox.Show("Hows that!");
}
else if (intCheckee < intCheckAgainst)
{
MessageBox.Show("Too Low!");
}
else
{
MessageBox.Show("Too High!");
}
}
Glenn Patton14y ago
String.Replace(".",""); gives the required answer, thanks!
Glenn Patton14y ago
Okay....Thanks for that in the mean time I have been hacking to produce the following
(it's test code don't worry!)
private void button1_Click(object sender, EventArgs e)
{
string CheckAgainst = "2.08.08";
string Checkee = null;
int intCheckAgainst = 0;
int intCheckee = 0;
int count = 0;
string output = null;
const char Stop = '.';
string Version_Number = null;

Checkee = textBox1.Text;

foreach (string subString in CheckAgainst.Split(Stop))
{
output += subString;

count++;
if (count == 3)
{
Version_Number = output;
break;
}
}
textBox2.Text = Version_Number;

intCheckAgainst = Convert.ToInt16(textBox2.Text);
intCheckee = Convert.ToInt16(textBox1.Text);

if (intCheckee == intCheckAgainst)
{
MessageBox.Show("Hows that!");
}
else
{
//intCheckee = Convert.ToInt16(textBox1.Text);
//MessageBox.Show(intCheckee.ToString());
if (intCheckAgainst < intCheckee)
{
MessageBox.Show("Too Low!");
}else if (intCheckAgainst > intCheckee)
{
MessageBox.Show("Too High!");
}
else
{
MessageBox.Show("Ooh Dear!");
}

}
}

private void button2_Click(object sender, EventArgs e)
{
string Checkee = "2.08.08";
string output = null;
int count = 0;
//int intCheckAgainst = 0;
string Version_Number = null;

const char Stop = '.';

// MessageBox.Show(CheckAgainst);

foreach (string subString in Checkee.Split(Stop))
{
output += subString;

count++;
if (count == 3)
{
Version_Number = output;
break;
}
}
//MessageBox.Show(Version_Number.ToString());
textBox1.Text = Version_Number;
}
The string.Replace method needs looking at thanks!

Glenn