Develop Reference

All the if statements running in c#? [closed]

Closed. This question needs debugging details. It is not currently accepting answers.
Edit the question to include desired behavior, a specific problem or error, and the shortest code necessary to reproduce the problem. This will help others answer the question.
Closed 1 year ago.
The community reviewed whether to reopen this question 1 year ago and left it closed:
Original close reason(s) were not resolved
Improve this question
I have some code below which is a URL Parser and the if statement doesn't work instead of executing the code when it is true it executes all the code in all the if statements.
public static class var
{ //Global variables
public static string stre = System.Uri.UnescapeDataString(Environment.CommandLine);
public static string[] str = stre.Remove(stre.Length - 1).Split(new string[] { "cmd:" }, StringSplitOptions.None);
}
public CMD()
{ //I suppose this class runs first so all my is statements are here
AClsMsgBox.Show("Parsing...", "CMD Parser", 1000); //msgbox
if (var.stre.Length > 5) { InitializeComponent();} //This executes even if I type "cmd:" which should trigger the statement below. (Always executes) This should run when typing "cmd:echo a command"
else if (var.stre.Length == 4) { Process.Start("cmd.exe"); } //This should run when typing "cmd:"(Never execute)
else { AClsMsgBox.Show("This is a URL Parser use it by typing 'cmd:<command>' in the URL adress bar field of a browsers.","CMD Parser",60000); } //Always executes
}
private void Form1_Load(object sender, EventArgs e)
{
string stra = var.str[1].Replace("&", "&&");
label1.Text += stra;
}
private void button1_Click(object sender, EventArgs e)
{
Process.Start("cmd.exe", " /k " + var.str[1]);
this.Close();
}
private void button2_Click(object sender, EventArgs e)
{
this.Close();
}
private void label1_Click(object sender, EventArgs e) { }
}
This is C# GUI so I am running InitializeComponent() only if I need to display the rest of buttons and stuff. (I think it should stop the GUI)
And there are no errors! But appear after building the code.
On running debugger:
System.IndexOutOfRangeException
HResult=0x80131508
Message=Index was outside the bounds of the array.
Source=CMD Parser GUI
StackTrace:
at CMD_Parser_GUI.CMD.Form1_Load(Object sender, EventArgs e) in D:\bat\CMD Parser GUI\Form1.cs:line 61
line 61 is "string stra = var.str[1].Replace("&", "&&");"

System.FormatException: 'Input string was not in a correct format.' in c# [closed]

Closed. This question needs details or clarity. It is not currently accepting answers.
Want to improve this question? Add details and clarify the problem by editing this post.
Closed 2 years ago.
Improve this question
Hello everyone I'm beginner at programming , and I saw this error in my program and I don't understand what I do.
private void button2_Click(object sender, EventArgs e)
{
double a = Convert.ToDouble(textBox1.Text);
double num = a*10;
MessageBox.Show(num.ToString());
}

It means that your text in a text box can't be converted into double. Maybe there is a some non numeric string value or some characters which are not relevant for double values.
First of all you should check your string if it is really numeric value and if text could not be parsed as double show appropriate message:
private void button2_Click(object sender, EventArgs e)
{
var txt = textBox1.Text;
double a;
if(!double.TryParse(txt, out a)
{
MessageBox.Show("Enter Valid Double Value");
return;
}
double num = a*10;
MessageBox.Show(num.ToString());
}

how do i add +1 to a label each time a button is clicked? [closed]

Closed. This question needs debugging details. It is not currently accepting answers.
Edit the question to include desired behavior, a specific problem or error, and the shortest code necessary to reproduce the problem. This will help others answer the question.
Closed 5 years ago.
Improve this question
protected void btnsubmit_Click(object sender, EventArgs e)
{
int result;
result=Convert.ToInt32(lblresult.Text);
}
this is all I have so far (just the variable)

Convert lblStart.Text value to int every time and assign it to i. Then increase i.
protected void btnsubmit_Click(object sender, EventArgs e)
{
i = Int32.Parse(lblStart.Text);
i++;
lblStart.Text = i.ToString();
}

Int won't increment by 1 [closed]

Closed. This question is not reproducible or was caused by typos. It is not currently accepting answers.
This question was caused by a typo or a problem that can no longer be reproduced. While similar questions may be on-topic here, this one was resolved in a way less likely to help future readers.
Closed 7 years ago.
Improve this question
I'm trying to increment the value of an int: counter by 1 each time the stakebtn is pressed.
Here's what I've tried so far:
private void stakebtn_Click(object sender, EventArgs e)
{
int counter = 0;
counter++;
currentstakes.Text = counter.ToString();
}
However, this only works one time- the currentstakes label will not go above 1.
Is anyone able to see where I am going wrong?

Obviously, it will increase only one time, declare it outside your click,
int counter = 0;
private void stakebtn_Click(object sender, EventArgs e)
{
counter++;
currentstakes.Text = counter.ToString();
}

You are setting it to zero every time before you increment it, move the counter declaration outside the method:
int counter = 0;
private void stakebtn_Click(object sender, EventArgs e)
{
counter++;
currentstakes.Text = counter.ToString();
}

Change height of rectangle with value in textbox [closed]

Closed. This question does not meet Stack Overflow guidelines. It is not currently accepting answers.
Questions asking for code must demonstrate a minimal understanding of the problem being solved. Include attempted solutions, why they didn't work, and the expected results. See also: Stack Overflow question checklist
Closed 9 years ago.
Improve this question
I'm quite new to C# and I'm trying to change the height of a rectangle to the value of the number in my textbox when i press a button.
So when I hardcode it I get
private void btnGrafiek_Click(object sender, RoutedEventArgs e)
{
rct2010.Height = 150;
}
this is without the texbox and worked fine.
I thought I had to do this if I use a textbox:
private void btnGrafiek_Click(object sender, RoutedEventArgs e)
{
rct2010.Height = txt2010.Text;
}
But this doesn't work. Can somebody help me with this?

Height is an integer, but Text is a string. This isn't safe, in case the string can't parse to an integer, but it will work for your simple example.
private void btnGrafiek_Click(object sender, RoutedEventArgs e)
{
rct2010.Height = int.Parse(txt2010.Text);
}
To be really safe you would use TryParse.
private void btnGrafiek_Click(object sender, RoutedEventArgs e)
{
int height;
if(int.TryParse(txt2010.Text,out height))
{
rct2010.Height = height;
}
else
{
rct2010.Height = 150;
}
}

convert it to an int
private void btnGrafiek_Click(object sender, RoutedEventArgs e)
{
rct2010.Height = int.Parse(txt2010.Text);
}
or you can go a step further
private void btnGrafiek_Click(object sender, RoutedEventArgs e)
{
int i = 0;
if(int.TryParse(txt2010.Text, out i)
rct2010.Height = i;
else
MessageBox.Show("That's not a number");
}

Presumably the type of Height is int, and so assigning a value of type string won't work and you'll get a compile-time error stating as such (feel free to clarify); you'll need to convert the type, such as:
int height = 0;
if (int.Parse(txt2010.Text, out height)) {
rct2010.Height = height;
}
The TryParse (as opposed to the otherwise suggested Parse) will ensure your application doesn't encounter an exception if the value cannot be parsed (i.e. it's bad, unexpected input). But then, on the other hand, this means your application apparently does nothing with the input (because it doesn't), so you may wish to use an else case to inform the user.