C#•10mo ago

Help with Arrays in my code?

https://paste.mod.gg/giovsrlllnke/0 Having a bit of an issue with my code. Working on an assignment where I have to load code in from a textfile and it's supposed to load in blocks. My teacher has detailed some header comments on the process, but I keep getting this error When I load in the file

private void mnuFileLoad_Click(object sender, EventArgs e)
        {
            //todo
            //load the file and store it into the colour array file 
            //set all the colours to be unselected
            //select a file
            OpenFileDialog oFD = new OpenFileDialog();
            if (oFD.ShowDialog() == DialogResult.OK)
            {
                


                //file selected so open to read it
                StreamReader oSR = new StreamReader(oFD.OpenFile());
                int Records = int.Parse(oSR.ReadLine());
                //size Colours array
                Colours = new int[Records];
                //loop through each line to store mark in array
                for (int i = 0; i < Colours.Length; i++)
                {
                    Colours[i] = int.Parse(oSR.ReadLine());
                    

                }



            }

private void mnuFileLoad_Click(object sender, EventArgs e)
        {
            //todo
            //load the file and store it into the colour array file 
            //set all the colours to be unselected
            //select a file
            OpenFileDialog oFD = new OpenFileDialog();
            if (oFD.ShowDialog() == DialogResult.OK)
            {
                


                //file selected so open to read it
                StreamReader oSR = new StreamReader(oFD.OpenFile());
                int Records = int.Parse(oSR.ReadLine());
                //size Colours array
                Colours = new int[Records];
                //loop through each line to store mark in array
                for (int i = 0; i < Colours.Length; i++)
                {
                    Colours[i] = int.Parse(oSR.ReadLine());
                    

                }



            }

looking at this portion, I'm not sure how to set all my code to be unselected

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16 Replies

Angius•10mo ago

Looks like Selected is null I don't see you setting Selected anywhere

ArrayOP•10mo ago

Right !! @ZZZZZZZZZZZZZZZZZZZZZZZZZ

Angius•10mo ago

There you have it, then. A "nothing" cannot have a length

ArrayOP•10mo ago

I have to make the colours un selected, so I have to find a way to sort of use that selected variable and assign it to the colors array and make it false Probably is, I;m not sure how to Or rather, how do I give it a length? Or maybe I can just make selected false? @ZZZZZZZZZZZZZZZZZZZZZZZZZ sorry to ping, but any chance you can hep me out

Angius•10mo ago

You do not give it a length You need to set it to... something if you want to use it That something might have a length, if it's some sort of a collection, for example

ArrayOP•10mo ago

I think I need to create a new array of bool and store it in Selected maybe? I'm a bit lost on how to do this though

ArrayOP•10mo ago

Or any ideas on what I should set it to? The idea is that the blocks on the textfile display

Angius•10mo ago

It really doesn't need like you need any sort of Selected here, judging by the text you sent Like, this seems to be basically it Just gotta hook the Colors array to... something to display them

ArrayOP•10mo ago

I did this and it worked

Angius•10mo ago

It would set all items in the Selected array to false, yes

ArrayOP•10mo ago

Yay I got it to work for this portion Thank you @ZZZZZZZZZZZZZZZZZZZZZZZZZ

Angius•10mo ago

I didn't do much, admittedly, but you're welcome

ArrayOP•10mo ago

You notice how I named it //size colours Array? Do you have any ideas for a better headercomment name

Angius•10mo ago

If I had to have a comment there, it would probably be "initializing the arrays"

ArrayOP•9mo ago

Because I did worked with the Selected thing Gotcha Thank you

private void Form1_MouseClick(object sender, MouseEventArgs e)
        {
            //todo
            //mouse click detects if an array element selected
            //set the element selected in Selected array to true



            //call this.Refresh() if an element is selected
            this.Refresh();
        }

private void Form1_MouseClick(object sender, MouseEventArgs e)
        {
            //todo
            //mouse click detects if an array element selected
            //set the element selected in Selected array to true



            //call this.Refresh() if an element is selected
            this.Refresh();
        }

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Help with Arrays in my code?