Thanx - Nagu
In the TextChanged event of your textbox, use a code that will find all the word in it and see if they start with what you want.
Something like this :
public void textbox1TextChanged(object sender, RoutedEventArgs e)
{
foreach(string word in textbox1.Text.Split(' '))
{
// Use a regular expression to test word
}
}
Here is an example but not the best one: to fit all the possible scenarios, you should use a regular expression:
string
s = "Hello 12rld"; foreach(string word in s.Split(' ')){
char c = Convert.ToChar( word.Substring(0, 1)); int a; if ( Int32.TryParse(c.ToString(), out a)){
Console.WriteLine("Start with number");}
else{
Console.WriteLine("Ok");}
}
HTH
void TextBox_TextChanged(object sender, RoutedEventArgs e)
{
string test = (sender as TextBox).Text;
foreach(char c in test)
{
if((c >= 'A' && c <= 'Z') ||
(c >= 'a' && c <= 'z') || c == ' ')
{
// ok
}
else
{
// not okay
}
}
}
To prevent a bad character from ever showing up in the text box, I think you can process the PreviewTextChanged event instead and, if the character is "bad," set e.Handled = true to prevent it from being processed further.
if(test[0] == "...")
Yeah, you're right: what I said was just a possible idea where to start.
It coule also be interesting to use StartWith, as he wants to check if only the beginning of the text is a number.
