Utilizing List boxes in group box
I tend to get myself thinking in circles. So the assignment is to convert from a selection. Inches, feet, and yards to its selected equivalent. With also if the same is selected on both sides, it will show the exact number. ie, 12 inches will show 12 inches in the converted distance. I am missing something or a step and can't pinpoint how to put the Yards, Inches, and Feet into my commands and they are reading red. Please help me figure this out.
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25 Replies
Look at what variables you have declared, then read the error messages and look where the red squiggles are.
fromGroupBox is declared as int fromGroupBox = 0; (and is never reassigned)
your switch is then having its cases be strings...
you can't compare strings to ints, so that doesnt workso what should i do? The course book shows similar to this so I am a bit confused on how to resolve this
well for one, you'll need to access the actual listbox control and get its value
currently you are not checking what the user has selected
you have a lot of code that seems like it should do that, but its acting on your
0 declared value, not the actual thing the user selectedSo should I remove the string code?
I am sorry this chapter really confused me compared to the other ones
dont delete anything, but lets take a step back
how do we check what the user has selected in the FROM list?
if statements?
one step even further back
how do we access that information?
Declare the variables
wrong
the variables are just variables
they dont magically contain the values from the UI
we must access the control's properties
you are correctly doing it for the distance the user entered
the double.parse
but not for your to/from lists
not the parse itself
what does
double.Parse do?its a string for numeric values
I uh.. don't agree :p
its a method that takes a string in, and returns a double, if the strings content is something that looks like a number
ok
so its taking the numbers from the text box to calculate with it inputed in the commands
The way you used it, yes
but it doesnt magically know what to parse
you have to give it a string, in this case, the text from the textbox
distance = double.Parse(distanceTextBox.Text);
what part of this is the UI control?the Distance Text Box
correct
but we are not looking for the distance right now, we need what the user picked from the "To" box...
how would we go about getting that?
so I need to do the messagebox.show?
nope
you have the UI controls already, I can see them in your screenshot
but your code that you pasted isnt accessing them
Do I need to do the double inches, double feet?
?
Like at the top with the double distance, specifying them at the beginning? I got how to do checked and radio box but this one wasn't explained well in the book
Hm. Want to jump on a screenshare real quick?
Might just be easier to show you
Sure let me switch to my laptop
ok ready
#vc-3