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How to count all characters from a string

    Question

  • Thank-you for all of the help this forum has already given me.

    The summary of what I would like to do is output a character count into a text box from a string, if the character count equals x-amount, then a warning pops up or is displayed elsewhere on the form.

    I've found separate samples of code that shows somewhat how to do this in the console, but when attempted to adapt it to the current project I am working on (for learning purposes, this isn't homework or a work project or anything else that I will be paid for - it's simply to help me learn and understand different aspects of C#). The string is not static.

    As an added bonus, if possible, I would like the count to update any real-time.

    I appreciate any links, code examples, pointers in the right direction you all can provide. I don't want my work done for me, and I don't want to be a bother to the forums as I don't have much to contribute as I'm just learning, but again, I appreciate any help. Thanks. If I haven't explained well enough, let me know and I will try again.



    Shakie
    Friday, October 24, 2008 6:15 PM

Answers

  • string value = "bob";
    Console.WriteLine(value.Length); // outputs "3".

    Now, because strings are immutable, meaning they never change once they've been instantiated, there's no way to get a notification on a string length change.  You could wrap the string somewhere else, and do something like this:

    public class StringHolder   
    {  
        private string value;  
     
        public string Value   
        {      
            get { return _value; }  
            set   
            {  
                if (value.Length == 3)  
                    Console.WriteLine("WARNING: The length of the string is 3 characters!!!");  
                _value = value;  
            }  
        }  

    David Morton - http://blog.davemorton.net/
    Friday, October 24, 2008 6:22 PM
  • Hi Shakie,
    If you have a windows forms project and have a textbox where a user can enter any text he wants and you wish to fire an alert after the text reaches a certain length you can do so by verifying the length of the text that is in the textbox control, you can do this by listening to the TextChanged event of the textbox control, if you're textbox is named textBox1 this is what the code would look like:

    private void textBox1_TextChanged(object sender, EventArgs e)
    {
            if (textBox1.Text.Length > 4)
            {
                
    MessageBox.Show("text should be 4 characters or less!!!");
            }
    }

    with this everytime the user types or deletes a character this condition will be checked, note that instead of using a MessageBox you could show a label or an errorprovider to avoid having the user click 'ok' on the message box.

    Regards,
    Omar

    Friday, October 24, 2008 8:32 PM
  • each control will cause events to happen in your app. for instance if the textboxes text is changed, it will fire a textbox changed event. you can perform a task when the events are fired. if you are using visual studio it is simple. either double click on the textbox in the designer and the handler will be added for you. It shows up as a simple method that you fill with code. you can create handlers for all sorts of events. usually you would create them inside of the constructor. the code would look something like this.

           public Form1()  
            {     
                //this is your constructor           
                InitializeComponent();  
                //here we add our handler to the textchanged event  
                textBox1.TextChanged += new EventHandler(textBox1_TextChanged);   
                  
            }  
            //this is the method that was attached to the handler  
            void textBox1_TextChanged(object sender, EventArgs e)  
            {  
              //count represents a method that you should create to perform all of the counting  
                count();  
            }  
            void count()  
            {   
            //do your counting in here and set label text from here  
            } 

    then just create a handler for each control that will effect the count and call your count method from within each one.
    Sunday, October 26, 2008 6:02 PM
  • Hi Shakie,

    I agree with BradMS... :)

    As earlier you mentioned that you are using some TextBox, CheckBox and RadioButton..
    So just for information the required events will be...

            //For TextBox  
            void textBox2_TextChanged(object sender, System.EventArgs e)  
            {  
                //Write your code here  
            }  
     
            //For Checkbox  
            void cboxOpt1_CheckedChanged(object sender, System.EventArgs e)  
            {  
                //Write your code here  
            }  
     
            //for RadioButton  
            private void radioButton1_CheckedChanged(object sender, EventArgs e)  
            {  
                //Write your code here  
            } 


    Cheers by Anand Ranjan
    Developer
    Monday, October 27, 2008 4:40 AM

All replies

  • string value = "bob";
    Console.WriteLine(value.Length); // outputs "3".

    Now, because strings are immutable, meaning they never change once they've been instantiated, there's no way to get a notification on a string length change.  You could wrap the string somewhere else, and do something like this:

    public class StringHolder   
    {  
        private string value;  
     
        public string Value   
        {      
            get { return _value; }  
            set   
            {  
                if (value.Length == 3)  
                    Console.WriteLine("WARNING: The length of the string is 3 characters!!!");  
                _value = value;  
            }  
        }  

    David Morton - http://blog.davemorton.net/
    Friday, October 24, 2008 6:22 PM
  • string str= "********";

    int count = str.Length;
    AlexB
    Friday, October 24, 2008 6:22 PM
  • Hi Shakie,
    If you have a windows forms project and have a textbox where a user can enter any text he wants and you wish to fire an alert after the text reaches a certain length you can do so by verifying the length of the text that is in the textbox control, you can do this by listening to the TextChanged event of the textbox control, if you're textbox is named textBox1 this is what the code would look like:

    private void textBox1_TextChanged(object sender, EventArgs e)
    {
            if (textBox1.Text.Length > 4)
            {
                
    MessageBox.Show("text should be 4 characters or less!!!");
            }
    }

    with this everytime the user types or deletes a character this condition will be checked, note that instead of using a MessageBox you could show a label or an errorprovider to avoid having the user click 'ok' on the message box.

    Regards,
    Omar

    Friday, October 24, 2008 8:32 PM
  • You could also set the TextBox's MaxLength property to prevent the user from entering more than four characters.
    David Morton - http://blog.davemorton.net/
    Friday, October 24, 2008 9:22 PM
  • Thank-you for all of the advice so far. I think with all of this, it is putting me in the right direction, however, I'm just not there yet. Part of the problem is I've implemented multiple text boxes and a few check boxes and radio buttons, all which have text inserted or assigned and are added to the MyString value and copied to the clipboard for pasting elsewhere. Sounds strange I know. It was the only type of program I could think of that would allow me to keep expanding and see how different components are used between various situations.

    Here is an example of the code:
    private void btnCompile_Click(object sender, EventArgs e) 
            { 
                // Declare MyString as a variable of items 
                string MyString = ""
                                             
                 
                // Does Box1 Text box have text?      
                if (txtBox1.Text.Length > 0)  
                { 
                    // Yes, add text to string 
                    MyString += "**Box1**" + " " + txtBox1.Text + " "; 
                } 
                // Does Box2 Text box have text? 
                if (txtBox2.Text.Length > 0) 
                { 
                    // Yes, add text to string 
                    MyString += "**Box2**" + " " + txtBox2.Text;  // the " " after the first + is to add a space  
                                                                  //  between box1 text and box2 text. 
                } 
     
                // This is where the option strings will go 
                String Opt1 = " **Opt1**"; // the space is to provide a space between text and this option 
                if (cboxOpt1.Checked) 
                { 
                    MyString += Opt1; 
                } 
                 
                // Copy the above items to the clipboard 
                Clipboard.SetData(DataFormats.StringFormat, MyString); 
           } 
                 

    So what I am wanting to do is display the total amount of characters, from all text boxes and options, of which will be put into MyString into a label (or other text box). Does this make more sense?

    Shakie
    Saturday, October 25, 2008 3:44 AM
  • David M Morton said:

    You could also set the TextBox's MaxLength property to prevent the user from entering more than four characters.


    David Morton - http://blog.davemorton.net/


    I don't want to prevent any characters, only count the ones given. Thank-you for the idea though.

    Shakie
    Saturday, October 25, 2008 3:45 AM
  • Hi,

    What I understand is you need all the controls "Text Length"...
    So you can do it like this..

    // Declare MyString as a variable of items    
                string MyString = "";  
                int TotalLength = 0;  
     
                // Does Box1 Text box have text?         
                if (textBox1.Text.Length > 0)  
                {  
                    // Yes, add text to string    
                    MyString += "**Box1**" + " " + textBox1.Text + " ";  
                    TotalLength += textBox1.Text.Length;  
                }  
                // Does Box2 Text box have text?    
                if (textBox2.Text.Length > 0)  
                {  
                    // Yes, add text to string    
                    MyString += "**Box2**" + " " + textBox2.Text;  // the " " after the first + is to add a space     
                    TotalLength += textBox2.Text.Length;  
                    //  between box1 text and box2 text.    
                }  
     
                // This is where the option strings will go    
                String Opt1 = " **Opt1**"; // the space is to provide a space between text and this option    
                if (cboxOpt1.Checked)  
                {  
                    MyString += Opt1;  
                    TotalLength += cboxOpt1.Text.Length; // assumes that you need the length of Checkbox text  
     
                    //If you want to take each checked item as 1 string  
                    //TotalLength += 1;  
                }  
     
                // Copy the above items to the clipboard    
                Clipboard.SetData(DataFormats.StringFormat, MyString);   
     
                label1.Text = MyString + "  Length is : "+ TotalLength;  
     
                //If you want to get the length of Whole new string  
                //label1.Text = MyString + "  Length is : " + MyString.Length; 

    If this is not your requirement let us know ... :)

    Cheers by Anand Ranjan
    Developer
    Saturday, October 25, 2008 7:55 AM
  • Anand,

    Thank-you so much for your reply. This is along the exact lines of what I want to do. I made a slight adjustment to how it outputs with this:
    txtCharCount.Text = MyString.Length.ToString(); 

    instead of this:
    label1.Text = MyString + "  Length is : " + MyString.Length; 

    as I was getting an error about int to string (Cannot implicitly convert type 'int' to 'string'). It's not important, it's working along the lines of what I would like.

    One of the last things I am looking to do is to display this text count in real-time somehow if possible. For instance, if typing in textBox1, is there a way to make txtCharCount.Text increase each time a new character is introduced?

    Again, thank-you for all the help you've provided and your time as well.

    Shakie
    Sunday, October 26, 2008 5:41 PM
  • each control will cause events to happen in your app. for instance if the textboxes text is changed, it will fire a textbox changed event. you can perform a task when the events are fired. if you are using visual studio it is simple. either double click on the textbox in the designer and the handler will be added for you. It shows up as a simple method that you fill with code. you can create handlers for all sorts of events. usually you would create them inside of the constructor. the code would look something like this.

           public Form1()  
            {     
                //this is your constructor           
                InitializeComponent();  
                //here we add our handler to the textchanged event  
                textBox1.TextChanged += new EventHandler(textBox1_TextChanged);   
                  
            }  
            //this is the method that was attached to the handler  
            void textBox1_TextChanged(object sender, EventArgs e)  
            {  
              //count represents a method that you should create to perform all of the counting  
                count();  
            }  
            void count()  
            {   
            //do your counting in here and set label text from here  
            } 

    then just create a handler for each control that will effect the count and call your count method from within each one.
    Sunday, October 26, 2008 6:02 PM
  • Hi Shakie,

    I agree with BradMS... :)

    As earlier you mentioned that you are using some TextBox, CheckBox and RadioButton..
    So just for information the required events will be...

            //For TextBox  
            void textBox2_TextChanged(object sender, System.EventArgs e)  
            {  
                //Write your code here  
            }  
     
            //For Checkbox  
            void cboxOpt1_CheckedChanged(object sender, System.EventArgs e)  
            {  
                //Write your code here  
            }  
     
            //for RadioButton  
            private void radioButton1_CheckedChanged(object sender, EventArgs e)  
            {  
                //Write your code here  
            } 


    Cheers by Anand Ranjan
    Developer
    Monday, October 27, 2008 4:40 AM