Develop Reference

How can I connect multiple TextBoxes with a ProgressBar?

I just started with the programming language C# a week ago and used the program Visual Studio with win Forms. I've had a problem for a few days.
I want to connect a ProgressBar to different TextBoxes. So that with each filled textBox the ProgressBar increases. When the text is removed, the progressBar should go down again.
So far I've only managed to get the progressBar to increase in general or that the progress bar increases with each letter in a textBox.
Textboxes are Vorname,Nachname,PLZ,Wohnort,Hausnummer,Straße
ProgressBar is Fortschrittsanzeige
private void button1_Click(object sender, EventArgs e)
{
Fortschrittsanzeige.Dock = DockStyle.Bottom;
Fortschrittsanzeige.Maximum = 60;
Fortschrittsanzeige.Minimum = 0;
Fortschrittsanzeige.Style = ProgressBarStyle.Continuous;
if (
Vorname.Text.Length <= 0 ||
Nachname.Text.Length <= 0 ||
PLZ.Text.Length < 4 ||
Wohnort.Text.Length <= 0 ||
Hausnummer.Text.Length <= 0 ||
Straße.Text.Length <= 0
)
{
textBox7.Text = ("Bitte überprüfe deine Eingabe");
}
else
{
Sendebutton.Text = "Gesendet";
textBox7.Text = "Vielen Dank" + Vorname.Text + " " + Nachname.Text + ", wir
haben deine Daten erhalten.";
}
if (Vorname.Text.Length <= 0)
{
Vorname.BackColor = Color.IndianRed;
}
else
{
Vorname.BackColor = Color.White;
Fortschrittsanzeige.Value += 10;
}
if (Nachname.Text.Length <= 0)
{
Nachname.BackColor = Color.IndianRed;
}
else
{
Nachname.BackColor = Color.White;
Fortschrittsanzeige.Step += 10;
}
if (PLZ.Text.Length < 4)
{
PLZ.BackColor = Color.IndianRed;
}
else
{
PLZ.BackColor = Color.White;
Fortschrittsanzeige.Step += 10;
}
if (Wohnort.Text.Length <= 0)
{
Wohnort.BackColor = Color.IndianRed;
}
else
{
Wohnort.BackColor = Color.White;
Fortschrittsanzeige.Step += 10;
}
if (Hausnummer.Text.Length <= 0)
{
Hausnummer.BackColor = Color.IndianRed;
}
else
{
Hausnummer.BackColor = Color.White;
Fortschrittsanzeige.Step += 10;
}
if (Straße.Text.Length <= 0)
{
Straße.BackColor = Color.IndianRed;
}
else
{
Straße.BackColor = Color.White;
Fortschrittsanzeige.Step += 10;
}
}

You can handle the TextChanged event on each TextBox like so
private void textBox1_TextChanged(object sender, EventArgs e)
{
if (textBox1.Text.Length > 0 && _textbox1IsEmpty)
{
progressBar1.Value += 10;
_textbox1IsEmpty = false;
}
else if (textBox1.Text.Length <= 0)
{
progressBar1.Value -= 10;
_textbox1IsEmpty = true;
}
}
and add a private property in your class
private bool _textbox1IsEmpty = true;
You can make a function to optimize it and don't have duplicate code

Here are a few tips to get you started with WinForms and make it easier to connect multiple TextBoxes with a ProgressBar.
The textboxes (and other controls) that are on a Form can be found in the Controls collection of the form.
All of the textboxes on the form can be obtained with a simple query.
For example, in the form Constructor you could go though all the textboxes and attach a TextChanged handler to each.
public MainForm()
{
InitializeComponent();
foreach (TextBox textBox in Controls.OfType<TextBox>())
{
textBox.TextChanged += onAnyTextChanged;
onAnyTextChanged(textBox, EventArgs.Empty); // Initialize
}
ActiveControl = Fortschrittsanzeige;
}
Multiple text boxes can all point to a common event handler.
System.Linq reduces the amount of code needed for things like matching and sorting.
What we're able to do is perform a validation based on all the textboxes whenever any textbox changes.
const int TEXTBOX_COUNT = 6;
private void onAnyTextChanged(object? sender, EventArgs e)
{
if(sender is TextBox textbox)
{
bool isValid;
if(textbox.PlaceholderText == "PLZ")
{
isValid = textbox.TextLength > 3;
}
else
{
isValid = !string.IsNullOrWhiteSpace(textbox.Text);
}
textbox.BackColor = isValid ? Color.White : Color.LightSalmon;
}
// Use System.Linq to count the number of valid textboxes (based on BackColor).
float countValid =
Controls
.OfType<TextBox>()
.Count(_=>_.BackColor== Color.White);
var pct = countValid / TEXTBOX_COUNT;
Fortschrittsanzeige.Value = (int)(pct * Fortschrittsanzeige.Maximum);
Sendebutton.Enabled = countValid.Equals(TEXTBOX_COUNT);
Fortschrittsanzeige.Visible = !Sendebutton.Enabled;
}
The handler allows for "special cases" and will make the Fortschrittsanzeige go backwards if the changed value is no longer valid.
When all textboxes are valid hide Fortschrittsanzeige and enable Sendebutton.

Stopping the calculations because of predicted error

I am unsure how to ask this question as I can't quite well translate it.
I am currently working on my own Windows Form Application that will calculate the dimensions of a given package in inches (written all together in string format) and calculate the dimensions in centimeters, milimeters or even meters and at this point I was wondering what if someone entered wrong dimensions and given measures can not be parsed.
Something like Environment.Exit(), but without closing the application just stopping calculations and writing a message that an error has occured.
If there is a question like this answered, please do link it because I haven't been able to find it.
namespace PretvaranjeDimenzija
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
public double mjera = 1;
public bool pogreska = false;
public string mjeraKratica = " cm";
public string dimenzijeIspis = "";
private void buttonIzracunaj_Click(object sender, EventArgs e)
{
string dim = textBoxDimenzije.Text;
if (dim.Contains('.'))
{
dim = dim.Replace('.', ',');
}
if (dim.Length != 0)
{
if (dim.IndexOf('x') != -1)
{
string[] multiDim = dim.Split('x');
double[] multiDimCentimetara = new double[multiDim.Length];
bool[] uspjeh = new bool[multiDim.Length];
for (int i = 0; i < multiDim.Length; i++)
{
uspjeh[i] = double.TryParse(multiDim[i], out multiDimCentimetara[i]);
if (uspjeh[i] == false)
{
pogreska = true;
goto kraj;
}
}
kraj:
if (pogreska == true)
{
MessageBox.Show("Doslo je do pogreske!");
pogreska = false;
}
else
{
double[] dimenzije = new double[multiDim.Length];
for (int i = 0; i < dimenzije.Length; i++)
{
dimenzije[i] = multiDimCentimetara[i] * 2.54 * mjera;
if (i == dimenzije.Length - 1)
{
dimenzijeIspis += dimenzije[i].ToString() + mjeraKratica;
}
else
{
dimenzijeIspis += dimenzije[i].ToString() + "x";
}
}
textBoxIspisDimenzija.Text = dimenzijeIspis;
dimenzijeIspis = "";
}
}
else
{
double dimCentimetara;
if(double.TryParse(dim, out dimCentimetara))
{
double dimenzija = dimCentimetara * 2.54 * mjera;
dimenzijeIspis = dimenzija.ToString() + mjeraKratica;
textBoxIspisDimenzija.Text = dimenzijeIspis;
dimenzijeIspis = "";
}
else
{
MessageBox.Show("Doslo je do pogreske!");
return;
}
}
}
}
private void radioButton1_CheckedChanged(object sender, EventArgs e)
{
mjera = 0.01;
mjeraKratica = " m";
if (radioButton2.Checked == true)
{
radioButton2.Checked = false;
radioButton1.Checked = true;
}
if (radioButton3.Checked == true)
{
radioButton3.Checked = false;
radioButton1.Checked = true;
}
}
private void radioButton2_CheckedChanged(object sender, EventArgs e)
{
mjera = 1;
mjeraKratica = " cm";
if (radioButton1.Checked == true)
{
radioButton1.Checked = false;
radioButton2.Checked = true;
}
if (radioButton3.Checked == true)
{
radioButton3.Checked = false;
radioButton2.Checked = true;
}
}
private void radioButton3_CheckedChanged(object sender, EventArgs e)
{
mjera = 10;
mjeraKratica = " mm";
if (radioButton2.Checked == true)
{
radioButton2.Checked = false;
radioButton3.Checked = true;
}
if (radioButton1.Checked == true)
{
radioButton1.Checked = false;
radioButton3.Checked = true;
}
}
}

It should be pretty simple, depending on your requirements. For example, you could just use a basic if block in your method.
void CalculateStuff()
{
// Get input. Do stuff.
if (IsInvalid)
{
MessageBox.Show("You did a bad thing.");
return; // exit the method.
}
// now that we know the input is good, do other stuff.
}
Substitute IsInvalid with whatever check condition you want that will return true if the input is not valid.

How to check if "Count equals 50 then"?

Edited question totally for more understanding.
I have a count function, and I have a label who checks the current count
Here is the label
private void currentCountLabel_TextChanged(object sender, EventArgs e)
{
}
How do I make so once the label reaches as example 50, a function starts. like play sound?
//////////////////////////////
Here is the current one that #btc sources, gave me
private void currentCountLabel_Click(object sender, EventArgs e)
{
if (String.Compare(currentCountLabel.Text, "5") == 0)
{
System.Media.SoundPlayer player = new System.Media.SoundPlayer(#"sound.wav");
player.Play();
}
}
But it wont play automaticly, how do I make it to play when it reaches the number?
///////////////////////////////////////////////////////////////////////////////
private void currentCountLabel_TextChanged(object sender, EventArgs e)
{
if (String.Compare(currentCountLabel.Text, "5") == 0)
{
System.Media.SoundPlayer player = new System.Media.SoundPlayer(#"meme.wav");
player.Play();
}
}
private void writeToFile()
{
if (Properties.Settings.Default.OBSToggle)
{
if (Properties.Settings.Default.ReverseOrder)
{
File.WriteAllText(#"Count.txt", String.Format("{0} {1}", Count.ToString(), Message));
}
else
{
File.WriteAllText(#"Count.txt", String.Format("{0} {1}", Message, Count.ToString()));
}
}
private void KeyBoardHook_KeyUp(object sender, KeyEventArgs e)
{
if (Properties.Settings.Default.HotKeyEnabled && e.KeyCode == Properties.Settings.Default.HotKeyIn)
{
if (Properties.Settings.Default.SaveCount)
{
Count = Count + 1;
Properties.Settings.Default.Count = Count;
currentCountLabel.Text = Properties.Settings.Default.Count.ToString();
}
else
{
Count = Count + 1;
currentCountLabel.Text = Count.ToString();
}
Message = messageTextBox.Text;
writeToFile();
e.Handled = true;
}
if (Properties.Settings.Default.HotKeyEnabled && e.KeyCode == Properties.Settings.Default.HotKeyDe && Count != 0)
{
if (Properties.Settings.Default.SaveCount)
{
Count = Count - 1;
Properties.Settings.Default.Count = Count;
currentCountLabel.Text = Properties.Settings.Default.Count.ToString();
}
else
{
Count = Count - 1;
currentCountLabel.Text = Count.ToString();
}
Message = messageTextBox.Text;
writeToFile();
e.Handled = true;
}
}

You need a static variable to hold the current count. Initialized to zero. Then increment it each time the function executes.
Then an if statement to evaluate the count and take whatever action.

DispatcherTimer class tick event issue

I don't know how to explain this clearly but I will try my best.
I'm using a DispatcherTimer class in my windows phone 8 project. I've got some check boxes and when a check box is checked and the button is pressed the countdown from a bus schedule starts. Everything works perfectly here but when I uncheck the check box and when I check another one, the same bus time starts and it goes down(countdown) by 2 seconds now. If I uncheck the check box and check another again the same time starts to countdown and the countdown goes by 3 seconds... I don't understand how, because on the click_event there is always a new instance of the class.
The only thing that solves the problem is to reload my wp8 page and check something again and press the button for the countdown to start.
Note: I'm reading my times from a .txt file which are store on a folder within my project (using streamreader).
Any suggestions?
Here is some code:
CheckBox[] listchekbox;
DispatcherTimer timer;
private void Button_Click(object sender, RoutedEventArgs e)//BUTTON CLICK
{
timer = new DispatcherTimer();
listchekbox = new CheckBox[4] { Check1, Check2, Check3, Check4 };
if (Onlyoneclick(listchekbox, 0)) { Gettingbustime(path_names[0]); }
else if (Onlyoneclick(listchekbox, 1)) { Gettingbustime(path_names[1]); }
timer.Interval = new TimeSpan(0,0,1);
timer.Tick += onclick;
timer.Start();
}
private void onclick(object sender, EventArgs e) // TIMER EVENT COUNT
{
Countdown(bus1); // the parameter is the textbox where the result is displayed
Countdown(bus2);
}
private bool Onlyoneclick(CheckBox[] itemselected,int id) // this is not so important
{
int itemcounter = 0;
int falsecounter = 0;
for (int i = 0; i < listchekbox.Length; i++)
{
if (itemselected[i].IsChecked == true && id == i)
{
itemcounter++;
}
else if (itemselected[i].IsChecked == true) { falsecounter++; }
}
if (itemcounter == 1 && falsecounter==0) { return true; }
else { return false; }
}
public void Countdown(TextBlock tx)
{
string minute = tx.Text.Substring(0, 2);
string sekunde = tx.Text.Substring(3, 2);
int minute1 = Convert.ToInt32(minute);
int sekunde1 = Convert.ToInt32(sekunde);
sekunde1 = sekunde1 - 1;
if (sekunde1 < 0)
{
minute1 = minute1 - 1;
sekunde1 = 59;
}
if (minute1 < 0)
{
timer.Stop();
MessageBox.Show("Autobus left!");
}
if (sekunde1 < 10) { tx.Text = minute1.ToString() + ":0" + sekunde1.ToString(); }
else { tx.Text = minute1.ToString() + ":" + sekunde1.ToString(); }
if (minute1 < 10) { tx.Text = "0" + minute1.ToString() + ":" + sekunde1.ToString(); }
if (minute1 < 10 && sekunde1 < 10) { tx.Text = "0" + minute1.ToString() + ":0" + sekunde1.ToString(); }
}

Try removing this code from Button_Click:
timer = new DispatcherTimer();
timer.Interval = new TimeSpan(0,0,1);
timer.Tick += onclick;
And add it instead to your constructor.

C# On keypress - exit program

My program opens a series of forms all over the screen, am I able to code in an escape method, so on typing of the word "test" the program will close?
I was looking at the msdn keypress and how they use a switch, would I use something similar to check for the pressed key and if the correct key is pressed, a counter will increment of the correct key presses until, for "test", 4 will be reached, and if the pressed key is incorrect reset the counter and start over until the right order of keys are entered.
I hope that makes sense :P
public partial class TrollFrm : Form
{
int number = 1; //change to 2 and have the first instance of troll count = number - 1
System.Windows.Forms.Timer myTimer = new System.Windows.Forms.Timer();
public TrollFrm()
{
InitializeComponent();
this.Text = "Trololol - Troll Count: " + number;
startTimer();
}
private void TrollFrm_Load(object sender, EventArgs e)
{
//this.Enabled = false;
}
private void TrollFrm_FormClosing(object sender, FormClosingEventArgs e)
{
e.Cancel = true;
}
public void startTimer()
{
myTimer.Tick += new EventHandler(createForm);
//myTimer.Interval = 500;
myTimer.Start();
}
public void createForm(Object myObject, EventArgs myEventArgs)
{
Form frm = new TrollChildFrm();
Random randomX = new Random();
Random randomY = new Random();
frm.Text = "Trololol - Troll Count: " + number;
int xValue;
int yValue;
number++;
if (number % 2 == 0) //number is even.
{
xValue = (Convert.ToInt32(randomX.Next(1, 1920))) + 200;
yValue = (Convert.ToInt32(randomY.Next(1, 1080))) - 200;
}
else //number is not even.
{
xValue = (Convert.ToInt32(randomX.Next(1, 1920))) - 200;
yValue = (Convert.ToInt32(randomY.Next(1, 1080))) + 200;
}
frm.Show();
frm.Location = new Point(xValue, yValue);
if (number == 20)
{
myTimer.Stop();
}
}

It is an implementation you could use for scenario you described (not tested though):
int exitKeysCount = 0;
private void TrollFrm_KeyDown(object sender, KeyEventArgs e)
{
if (exitKeysCount == 0 && e.KeyCode == Keys.T)
exitKeysCount = 1;
else if (exitKeysCount == 1 && e.KeyCode == Keys.E)
exitKeysCount = 2;
else if (exitKeysCount == 2 && e.KeyCode == Keys.S)
exitKeysCount = 3;
else if (exitKeysCount == 3 && e.KeyCode == Keys.T)
this.Close();
else exitKeysCount = 0;
}
I assumed TrollFrm is your parent form, if they are all invoked somewhere else replace this.Close() with some function in main program function, also TrollFrm needs focus during key presses.

try this parent on your parent form.
int trollCount = 0;
private void TrollFrm_KeyDown(object sender, KeyEventHandler e)
{
if (trollCount == 0 && e.KeyCode == Keys.T)
{
trollCount = 1;
frm.Text = "Trololol - Troll Count:" + trollCount
}
else if (trollCount == 1 && e.KeyCode== Keys.E)
{
trollCount = 2;
frm.Text = "Trololol - Troll Count:" + trollCount
}
else if (trollCount == 2 && e.KeyCode== Keys.S)
{
trollCount = 3;
frm.Text = "Trololol - Troll Count:" + trollCount
}
else if (trollCount == 4 && e.KeyCode== Keys.T)
{
trollCount = 4;
this.Close();
}
else
trollCount = 0;
tell me if you need anything else.