Is there a way to use a bool to detect a false value in a foreach loop so that my method won't execute?

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I would like my application to to check if all 5 textboxes are numeric, and if the values are all true. Display the Talley. If not, I don't want my method to execute and right now it is. The way I have IsValid method coded, to me seems like it should work. I guess if someone could point me in the right direction, I'm sure there is a simple way of doing something such as this but I haven't found it. Thanks in advance to anyway that takes their time to look at this.

I have tried several variations of the example here, but haven't been able to do what it needs to do.

      private void btnCalculate_Click(object sender, EventArgs e)
    {


        if (IsValid()) // if everything passes it will hit this
        {
            double total;
            double hospitalCharge;
            hospitalCharge = CalcStayCharges() * Convert.ToDouble(txtDays.Text);
            total = hospitalCharge + CalcMiscCharges();
            CalcTotalCharges(total);
            lblDisplay.Text = "The total is " + CalcTotalCharges(total).ToString("c");
        }

        //else return;

        // IsNumber(txtDays.Text.ToString()); // testing somehing 

    }

    private double CalcStayCharges()
    {
        double hosipalCharge = 350;
        return hosipalCharge;
    }

    private double CalcMiscCharges()
    {
        double Totalcharges;
        Totalcharges = Convert.ToDouble(txtLab.Text) + Convert.ToDouble(txtMedication.Text) + Convert.ToDouble(txtRehab.Text) + Convert.ToDouble(txtSurgical.Text);
        return Totalcharges;
    }

    private double CalcTotalCharges(double total)
    {
        return total;
    }
    private bool IsNumber(TextBox myNumber)
    {
        if (double.TryParse(Convert.ToString(myNumber), out double n))
        {
           // MessageBox.Show("string");
            return false;

        }
       // MessageBox.Show("number"); // this is how you can test a bool value
        return true; 
    }
    private bool IsValid()
    {
        bool validation = false;
        foreach (Control ctl in this.Controls)
        {
            if (ctl is TextBox)
            {
                TextBox tb = ctl as TextBox;
                IsNumber(tb); 
                if (IsNumber(tb) == true)
                {
                    validation = true;

                }
                else if (IsNumber(tb) == false)
                {
                    validation = false;
                }

            } 

        }
        return validation;

    }

The problem is that your loop will override validation with whatever value it has last. So, as it stands, you code will only really validate the last text box.

The usual way to handle this is to make an assumption that it is valid. Loop through everything, and only set it if it is invalid. like this.

private bool IsValid()
{
    bool validation = true;
    foreach (Control ctl in this.Controls)
    {
        if (ctl is TextBox)
        {
            TextBox tb = ctl as TextBox;
            IsNumber(tb); 
            if (IsNumber(tb) == false)
            {
                validation = false;
            }

        } 

    }
    return validation;

}

PHP Solutions: Dynamic Web Design Made Easy, Edit the email field the same way, using $email instead of $name. needs to be handled slightly differently because <textarea> tags don t have a value attribute. You can check your code with contact_05.php in the ch05 folder. the existing foreach loop: // assume nothing is suspect $suspect = false; // create a pattern to  In PowerShell script, we often use logic to check some value is true or false. In normal case we may need to check if a value is true or not with If statement and in some other cases we may required to compare bool value property in Where object to filter array of values based on some Boolean value attribute.

Nick, please check this answer and you will understand. Basically he is getting all controls from the Page of type DropDownList (in your case TextBox). And then he iterates each control and validates them. If you want something more complex, when iterating the list of controls, you can validate its properties and process the controls with the specified properties that you gave to them, when you declared them in the page.

WSH and ADSI Administrative Scripting, This is used to tell the method that when it searches it is doing so without care for case The last thing we do is to use a ForEach / Next loop to access the value of the For my particular example , I returned only one value as I only have one AD the concept is thought as being the proper way to use something , such as a  Hi there, I'm currently trying to make a script that will set a vehicle seats maxspeed to 0 when it touches a sensor brick which has a bool value inside. The idea is that it would touch the brick and if the bool value inside the brick is false the seats maxspeed will go to 0 and then it would wait until the bool value changes to true at which

I rephrased your IsValid statement. Please check it out

private bool IsValid()
{
    bool validation = true;
    foreach (Control ctl in this.Controls)
    {
        if (ctl is TextBox)
        {
            TextBox tb = ctl as TextBox;
            if (IsNumber(tb) == false)
            {
                validation = false;
                break;
            }

        } 

    }
    return validation;

}

Improved version (basic syntax)

private bool IsValid()
{
    bool validation = true;
    foreach (TextBox tb in this.Controls.OfType<TextBox>())
    {
        if (!IsNumber(tb))
        {
            validation = false;
            break;
        }
    }
    return validation;

}

Android Apps with App Inventor: The Fast and Easy Way to Build , The Fast and Easy Way to Build Android Apps Jörg H. Kloss As the current variable value 9 is still larger than 0, the loop is run again, and the value is reduced to 8, checked again, and so on. in the loop body is reduced from 1 to 0 does the repeat condition check produce a negative result (the Boolean value false). That would be a circular dependency which would break the code that creates the content types (it would get stuck in an infinite loop walking the parent hierarchies..) So before I process the parent/child content types I would like to first detect if there is a circular dependency in the collection and halt the operation if one is detected.

Another variation of IsValid. It uses a pattern matching if and plays logic games to get rid of the validation variable:

 private bool IsValid()
 {
     foreach (var control in this.Controls)
     {
         if (control is TextBox textBox)
         {
             //the first test to fail cause the function to return false
             //no need to test the rest of the controls
             if (!IsNumber(textBox))
             {
                 return false;
             }
         }
     }
     //nothing returned false, so it must be valid
     return true;
 }

Notice that true and false only appear in the return statements. You don't need to test Booleans for truthiness or falsehood, they are true or false all on their own. If you want to test a bool b for true-ness:

if (b) { /* code goes here */ }

of for false-ness

if (!b) { /* other code */ }

The other thing you might do if you have a lot of controls on the page and only a few of them are text boxes is keep a separate collection of textbox controls. You could have a List<TextBox> and populate it once at page load time.

Head First C#, Look The Player and Game classes both use a reference to the multiline TextBox on private Dictionary<Values, Player> books; private Deck stock; private TextBox Using IEnumerable<T> in public class members is a great way to make your player, then use a // foreach loop to call each player's PullOutBooks​() method. }  @Dunk That seems a bit dogmatic. It's actually very rare to need to loop forever, other than at the top level of interactive programs. I see while (true) and instantly assume there's a break, return, or throw somewhere in there.

Why for-each? :) use Linq (more declarative way) programming! More of a condensed form and readable.

private bool IsValid()
    {
        return this.Controls.OfType<TextBox>().Where(t => 
                IsNumber(t.Text)).ToList().Any();
    }

You can use your IsNumber(...) to validate the text box values.

So you can use the validate method as below

if (!IsValid()) return;

Hope this helps.

Cheers!

Head First C#: A Learner's Guide to Real-World Programming with , Look closely at how it's used in the form. private List<Player> players; The Player to the multiline TextBox on the form to print messages private Dictionary<​Values, Using IEnumerable<T> in public class members is a great way to make your player, then use a // foreach loop to call each player's PullOutBooks() method. }  The default numeric value of true is 1 and false is 0. We can use bool type variables or values true and false in mathematical expressions also.For instance, int x = false + true + 6; is valid and the expression on right will evaluate to 7 as false has value 0 and true will have value 1.

foreach script check if boolean is true, obj is the gameobjects that the script with the boolean are attached to. the booleans from each object are set to true before winning the game. Although i do not see why as pcs is an array declared at the top like so. The way it is now, the your last check (T or F) is the one that sticks. Using System. To do what you are asking about the checkbox requires a converter. You would need to convert the value 0/1 to true/false for display and then back again when the value changes. Fortunately WPF and binding allow for this to happen. I noticed the funky way the checked/unchecked happens when you scroll.

Simplify your JavaScript – Use .some() and .find(), Simplify the way you write your JavaScript by using .some() and .find() instead of searching for data using for() and forEach() loops. You'll This array method helps you determine if one or more of its values correspond to The function must return a boolean (although a truthy/falsy value works as well). Instead of getting the SpriteRenderer component in the for loop you'd instead get this custom component and check the boolean. Do as @GroZZleR suggested and have a victory boolean that is true by default, and if any of your custom objects are discovered to have the bool member false (meaning it isn't a "winning" sprite, set victory to false and break out of the for loop.

The List of the 10 Most Common Mistakes That PHP Developers , Not sure how to use foreach loops in PHP? wasn't set and a variable that was set to null ), the array_key_exists() method is a much more robust solution. getValues() returns a COPY of the $values array, so this adds a 'test' element // to a (although it won't itself improve your memory utilization) by instead using the​  A simple very old trick for this is to use a count. And if 5 bools have to be true, you simply count in every validation one.

Comments
  • Your IsValid function can be greatly condensed. Change the if to: if (ctl is TextBox tb) {if (!IsNumber(tb) {return false;}}' Then, after the loop: return true;` (I think I have that right). Use a pattern-matching if, then if IsNumber fails for any of the controls, return false. If you get to the end of the loop, then return true.
  • In addition to the answers posted, I think maybe your code that checks for a number needs to return true for if (double.TryParse(Convert.ToString(myNumber), out double n)) and false if it doesn't parse (the opposite of what you have)