Error when i try to add my control to form1 - C# Discussion Boards

OriginalGriff29-Jul-19 22:06

OriginalGriff

29-Jul-19 22:06

Start with Google: Creating a struct dynamically C# - Google Search[^]
Loads of examples there ...

Sent from my Amstrad PC 1640
Never throw anything away, Griff
Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...
AntiTwitter: @DalekDave is now a follower!

BillWoodruff31-Jul-19 14:28

BillWoodruff

31-Jul-19 14:28

Because of the constraints that make using instances of run-time defined Types difficult, I'd recommend you look at an alternative like System.Dynamic ExpandoObject.

You create a Struct on-the-fly: any instance of it is going to be boxed, and right there you may have lost the potential benefits of using a Struct.

The few cases I've seen that needed to cook up some run-time bag of mixed Types could all be handled using System.Dynamic (or, even the now deprecated 'ArrayList).

Rick Strahl has done some very interesting work with ExpandoObject that I think could be relevant to your concerns: [^].

Describe your use case in detail, maybe you'll get more specific feedback.

«Where is the Life we have lost in living? Where is the wisdom we have lost in knowledge? Where is the knowledge we have lost in information?» T. S. Elliot

modified 1-Aug-19 14:45pm.

Richard Deeming1-Aug-19 1:40

Richard Deeming

1-Aug-19 1:40

BillWoodruff wrote:
or, even the now deprecated ArrayList

I'm not sure you'd ever need to use ArrayList, when you could just use List<object> instead. Smile | :)

"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer

Error when i try to add my control to form1

BillWoodruff1-Aug-19 8:47

BillWoodruff

1-Aug-19 8:47

Amen ! Wish I could say I was thinking of those doomed to use .NET pre-Linq, but I wasn't WTF | :WTF:

«Where is the Life we have lost in living? Where is the wisdom we have lost in knowledge? Where is the knowledge we have lost in information?» T. S. Elliot

_Q12_29-Jul-19 8:30

29-Jul-19 8:30

- I get this error when i try to add my control (named 'tab') to the form1:
https://images-wixmp-ed30a86b8c4ca887773594c2.wixmp.com/f/281c49f0-e874-4b83-bff6-9bc6b8526d42/ddctbbc-1dc0bf33-d2a3-4c8c-b6f5-c88acb2bf200.jpg?token=eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJzdWIiOiJ1cm46YXBwOjdlMGQxODg5ODIyNjQzNzNhNWYwZDQxNWVhMGQyNmUwIiwiaXNzIjoidXJuOmFwcDo3ZTBkMTg4OTgyMjY0MzczYTVmMGQ0MTVlYTBkMjZlMCIsIm9iaiI6W1t7InBhdGgiOiJcL2ZcLzI4MWM0OWYwLWU4NzQtNGI4My1iZmY2LTliYzZiODUyNmQ0MlwvZGRjdGJiYy0xZGMwYmYzMy1kMmEzLTRjOGMtYjZmNS1jODhhY2IyYmYyMDAuanBnIn1dXSwiYXVkIjpbInVybjpzZXJ2aWNlOmZpbGUuZG93bmxvYWQiXX0.BbYanI4o_JGUrbacjktRwbF20pjWI8KkmdUKJ6zs0x8[^]

and my custom tab control code is here:
"

public tab()
{
    InitializeComponent();
}


Image img = new Bitmap("google.png");
Rectangle rect = new Rectangle(5, 5, 22, 22);

private void tab_Paint(object sender, PaintEventArgs e)
{
    e.Graphics.DrawImage(img, rect);
}

"
the image "google.png" is in this folder:
D:\Programe\Info\Visual Studio 2010\Projects\Web\FFtabs\FFtabs\bin\Debug\
from the same folder where the executable is running!
Why is doing this? Please help me. I fight with this problem for years and I always had problems with loading images in VS.
I think is a root problem of some sort. Is there a rule that i missed it? I searched on all the internet (in time) for this problem but i never find a solution.
- My solution is NOT to load any image!!, and the code is running fine again, control is adding fine to form1,etc.
Thank you.

Richard Deeming29-Jul-19 9:10

Richard Deeming

29-Jul-19 9:10

The problem is that when the code runs in the design view, the current directory is the Visual Studio application directory, not your project's directory. The file C:\Program Files (x86)\Microsoft Visual Studio\2019\Professional\Common7\IDE\google.png doesn't exist, so the Bitmap constructor throws an exception.

You can use the DesignMode property[^] to test whether your control is in design mode. You should probably also check that the file hasn't been deleted:

Image img;

public tab()
{
    InitializeComponent();
    
    if (!DesignMode && File.Exists("google.png"))
    {
        img = new Bitmap("google.png");
    }
}

private void tab_Paint(object sender, PaintEventArgs e)
{
    if (img != null)
    {
        e.Graphics.DrawImage(img, rect);
    }
}

You should be able to adapt the code from this SO answer[^] to resolve the image path at design time, if you need to see the image in the designer:

private string ResolveImagePath()
{
    string path = "google.png";
    if (DesignMode)
    {
        var typeResolver = (ITypeResolutionService)GetService(typeof(ITypeResolutionService));
        if (typeResolver != null)
        {
            AssemblyName name = System.Reflection.Assembly.GetExecutingAssembly().GetName();
            string basePath = typeResolver.GetPathOfAssembly(name);
            path = Path.Combine(basePath, path);
        }
    }
    
    return path;
}

public tab()
{
    InitializeComponent();
    
    string imagePath = ResolveImagePath();
    if (File.Exists(imagePath))
    {
        img = new Bitmap(imagePath);
    }
}

"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer

_Q12_29-Jul-19 10:10

29-Jul-19 10:10

___The bug is thrown at the initialization of the image. As you can see in the code below:

public tab()
{
    InitializeComponent();
}


Image img = new Bitmap(@"google.png");
Rectangle rect = new Rectangle(5, 5, 22, 22);

private void tab_Paint(object sender, PaintEventArgs e)
{
    e.Graphics.DrawImage(img, rect);
}

___ NEXT, i initialize it in the constructor, following your helping code like this:

public partial class tab : UserControl
{
    public tab()
    {
        InitializeComponent();
        if (!DesignMode && File.Exists("google.png"))
        {
            img = new Bitmap("google.png");
        }
    }


    Image img;
    Rectangle rect = new Rectangle(5, 5, 22, 22);

    private void tab_Paint(object sender, PaintEventArgs e)
    {
        e.Graphics.DrawImage(img, rect);
    }

but another Error appear:
https://images-wixmp-ed30a86b8c4ca887773594c2.wixmp.com/f/281c49f0-e874-4b83-bff6-9bc6b8526d42/ddctlq3-8c112b8d-5685-4a43-a96e-21046443ef9a.jpg?token=eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJzdWIiOiJ1cm46YXBwOjdlMGQxODg5ODIyNjQzNzNhNWYwZDQxNWVhMGQyNmUwIiwiaXNzIjoidXJuOmFwcDo3ZTBkMTg4OTgyMjY0MzczYTVmMGQ0MTVlYTBkMjZlMCIsIm9iaiI6W1t7InBhdGgiOiJcL2ZcLzI4MWM0OWYwLWU4NzQtNGI4My1iZmY2LTliYzZiODUyNmQ0MlwvZGRjdGxxMy04YzExMmI4ZC01Njg1LTRhNDMtYTk2ZS0yMTA0NjQ0M2VmOWEuanBnIn1dXSwiYXVkIjpbInVybjpzZXJ2aWNlOmZpbGUuZG93bmxvYWQiXX0.1fkgpeEVDKRy30I70lftNt0WfbpoFl8LACty1N_fzsc[^]

Now what?
_ Your '!DesignMode' solution, is really nice and i didnt know it at all !
Awesome so far.

Richard Deeming30-Jul-19 1:52

Richard Deeming

30-Jul-19 1:52

_Q12_ wrote:
another Error appear

You missed the update to the tab_Paint event handler: Smile | :)

private void tab_Paint(object sender, PaintEventArgs e)
{
    if (img != null)
    {
        e.Graphics.DrawImage(img, rect);
    }
}

"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer

_Q12_30-Jul-19 7:58

30-Jul-19 7:58

Thank you for all your help - you really inspired me.
It was a very very old problem and now you 'confirmed' it to me. Thats why im so thankful. And pointing that was more a design issue and not a compile issue, cemented it for me.
Thumbs Up | :thumbsup:

_Q12_29-Jul-19 10:34

29-Jul-19 10:34

Are you sure the root is correct?
What i did: I created a new alb.jpg file into (your specified folder root):
"c:\Program Files (x86)\Microsoft Visual Studio 10.0\Common7\IDE
and the code now checks if in 'DesignMode', then load the default alb.jpg image.
Else, is runtime and load the normal image.
here is my code:

public tab()
{
    InitializeComponent();
    //if (!DesignMode && File.Exists("google.png"))
    //{
    //    img = new Bitmap("google.png");
    //}
    string alb = @"c:\Program Files (x86)\Microsoft Visual Studio 10.0\Common7\IDE\alb.jpg";
    if (DesignMode==true)
    {
        img = new Bitmap(alb);
    }
    else
    {
        img = new Bitmap("google.png");
    }
}


Image img;
Rectangle rect = new Rectangle(5, 5, 22, 22);

private void tab_Paint(object sender, PaintEventArgs e)
{
    e.Graphics.DrawImage(img, rect);
}

string mytext;
public string tab_Text
{
    get { return mytext; }
    set
    {
        label1.Text = mytext = value;
    }
}

I get the same error as the first time, not finding the png file.

_Q12_29-Jul-19 22:10

29-Jul-19 22:10

I find another solution but all thanks to your support, so many many thanks - it really helped me !!!

control code:

public tab()
{
    InitializeComponent();
}


Image img;
Rectangle rect = new Rectangle(3, 3, 22, 22);

private void tab_Paint(object sender, PaintEventArgs e)
{
    if (img!=null)
    {
        e.Graphics.DrawImage(img, rect);
    }
    else
    {
        e.Graphics.FillRectangle(new SolidBrush(Color.Black), rect);
    }
}

public Image tab_Image
{
    get { return img; }
    set
    {
        img = value;
    }
}

and in design mode i set the property for image. And the image is seen in the design mode this way with no apparent errors. I will see in time how good solution is this one.

.

UnauthorizedAccessException Access to the remote share path

Dave Kreskowiak29-Jul-19 9:16

Dave Kreskowiak

29-Jul-19 9:16

On top of what Richard said, for custom controls where you have images that don't change and are a mandatory part of your control, you should probably move the images to Resources instead of leaving them in files. You can then load the image from your controls Resource and you won't have any problems with managing files on the drive.

Load image from resources area of project in C# - Stack Overflow[^]

Asking questions is a skill
CodeProject Forum Guidelines
Google: C# How to debug code
Seriously, go read these articles.

Dave Kreskowiak

Member 1158435626-Jul-19 0:09

Member 11584356

26-Jul-19 0:09

Hello,
We faced a the remote share folder issues using the C#.
1. We used C# to build up a windows service to copy the file to the remote share folder.
2. There is a AD domain account which can be accessed to the share folder: \\server\path which on a remote server.
Issues:
If the server was be reboot, we will got the error when the Windows service tried to access to the share folder \\server\path on remote server.
But if I sign to Windows with the AD domain account and re-open the remote share folder using the authorized account without any password. Then the Windows service can access to the remote share folder.

So, is there any way to use the C# to access without sign in to Windows?

Thanks,
Jowvid.

Re: UnauthorizedAccessException Access to the remote share path

#realJSOP26-Jul-19 0:44

#realJSOP

26-Jul-19 0:44

Create a service account that the windows service runs as.

Service Accounts (Windows 10) | Microsoft Docs[^]

".45 ACP - because shooting twice is just silly" - JSOP, 2010
-----
You can never have too much ammo - unless you're swimming, or on fire. - JSOP, 2010
-----
When you pry the gun from my cold dead hands, be careful - the barrel will be very hot. - JSOP, 2013

c# app design

Member 1454172825-Jul-19 13:31

Member 14541728

25-Jul-19 13:31

I designed a CBT questions and answer using c# I have connected to the database using my sqlconne,but I don't know where to begin to start the code so the app can. Run or be active.or to function
Am stuck.
I don't know if u r getting this

Gerry Schmitz25-Jul-19 14:42

Gerry Schmitz

25-Jul-19 14:42

1) Get Visual Studio Community Edition
2)

Hello World -- Your first program - C# Programming Guide | Microsoft Docs

The Master said, 'Am I indeed possessed of knowledge? I am not knowing. But if a mean person, who appears quite empty-like, ask anything of me, I set it forth from one end to the other, and exhaust it.'
― Confucian Analects

Mycroft Holmes25-Jul-19 14:43

Mycroft Holmes

25-Jul-19 14:43

Now you need to decide on the client, so your options are Web or desktop and do you include mobile options?

If your clients in house and behind the firewall then WPF or winforms are your options. If you want it on the web then pick one of thousands of web frameworks to use.

I would leave any mobile options for a future date.

Never underestimate the power of human stupidity -
RAH
I'm old. I know stuff - JSOP

#realJSOP26-Jul-19 0:47

#realJSOP

26-Jul-19 0:47

Although, he could also do a web site that is restricted to the company's intranet as well.

Mycroft Holmes26-Jul-19 11:52

Mycroft Holmes

26-Jul-19 11:52

Yah but I'm a desktop developer and have never liked the web stack since they killed off Silverlight.

Never underestimate the power of human stupidity -
RAH
I'm old. I know stuff - JSOP

MSBassSinger30-Jul-19 7:33

MSBassSinger

30-Jul-19 7:33

Blazor brings the web app option back to within reason. No JavaScript needed. Just HTML and C#.

BillWoodruff25-Jul-19 15:10

BillWoodruff

25-Jul-19 15:10

Member 14541728 wrote:
I designed a CBT questions and answer using c#

Then tell us how you did this. If you actually wrote code, describe it.

We can't read your mind.

«Where is the Life we have lost in living? Where is the wisdom we have lost in knowledge? Where is the knowledge we have lost in information?» T. S. Elliot