Application.startup path error in designer

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I have this problem for many years but I never address it.
I have this custom control:

C#

using System.IO;
...............
    public partial class VIRxC : UserControl
    {
        public VIRxC()
        {
            InitializeComponent();
            image01 = Bitmap.FromFile(root + "Ohms Law Pie Chart.gif");
        }

        Image image01;
        string root = @"D:\Programe\Info\Visual Studio 2010\Projects\Electronics\ElectronicTool\ElectronicTool v4\ElectronicTool\bin\Debug\";
        //string root = Application.StartupPath;

What I have tried:

If I want to use

string root = Application.StartupPath;

, it is throwing me one or more errors in Form1 design window, see the picture here:
https://i.imgur.com/DRIZ5Qp.jpg[^]

To correct it, I write the DIRECT image ROOT, and everything goes back to normal. All the errors disappear and the designer is rendering the Form and its controls.
Can you help me understand and repair this issue?
Thank you very much !

Posted 18-Jul-21 5:45am

_Q12_

Updated 18-Jul-21 10:02am

v2

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3 solutions

Solution 2

The answer here will shed some light on this problem: vb.net - Defining path to executable for a custom control - Stack Overflow[^]
Although this is about VB.NET, it is the same for C#.

Posted 18-Jul-21 6:04am

RickZeeland

Solution 3

Hello,

Application.path is a ENV constant.

reWriting this constant in .Net is useless.

It's ENV about your application,
and except for reallocation ( when you use "string root =.. " ),
or renaming the same path;

Application.path is located in the folder the .exe exists.

( with the App not loaded , the Application.path is "NULL/UNDEFINED". )

Posted 18-Jul-21 10:02am

User 14076552

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Dave Kreskowiak · Accepted Answer · 2021-07-18T05:59:00

Solution 1

You cannot use Application.Startup at design-time. It doesn't exist until run-time.

Though, you can move the image to Resources and load it from there at design-time.

Posted 18-Jul-21 5:59am

Dave Kreskowiak

Comments

_Q12_ 18-Jul-21 12:29pm

Thank you very much!
Now I understand it.