C#•7mo ago

DrawString doesn't update text / Windows Forms

Hi. I'm new to C# development. I create a control on a form and want to print its ClientRectangle. Whenever I resize the parent form, OnPaint gets called but text doesn't change. Yet the console message is of course changing. Why it happens?

        protected override void OnPaint(PaintEventArgs e)
        {
            base.OnPaint(e);
            e.Graphics.FillRectangle(Brushes.Black, ClientRectangle);
            Console.WriteLine($"-->{ClientRectangle}");
            e.Graphics.DrawString($"==>{ClientRectangle}", Font, Brushes.White, ClientRectangle);
        }

        protected override void OnPaint(PaintEventArgs e)
        {
            base.OnPaint(e);
            e.Graphics.FillRectangle(Brushes.Black, ClientRectangle);
            Console.WriteLine($"-->{ClientRectangle}");
            e.Graphics.DrawString($"==>{ClientRectangle}", Font, Brushes.White, ClientRectangle);
        }

13 Replies

OnkelTemOP•7mo ago

I should clarify, that the text is getting printed one time, displaying the initial size, but it won't change aftewards

OnkelTemOP•7mo ago

Memw•7mo ago

https://learn.microsoft.com/en-us/dotnet/api/system.windows.forms.control.resize?view=windowsdesktop-8.0

Control.Resize Event (System.Windows.Forms)

Occurs when the control is resized.

Memw•7mo ago

I'd assume you need to use this because OnDraw seems to only be called when drawing for the first time and then you'd need to use the Resize event to change whatever you want to change

OnkelTemOP•7mo ago

Whose OnDraw? The OnPaint is called, that I can see in the console. I recorded a short video: https://youtu.be/zeRDKbGyxwU

Onkel Tem

YouTube

C# DrawString update problem

OnkelTemOP•7mo ago

I recorded one more video with the problem

OnkelTemOP•7mo ago

https://www.youtube.com/watch?v=AzqtWy6flsk

Onkel Tem

YouTube

C# DrawString update problem (2)

OnkelTemOP•7mo ago

Could someone have a look at this weird crap? This is so discouraging. A simple thing doesn't work If it starts this way then maybe C# or Windows Forms is just no the right tool

leowest•7mo ago

after InitializeComponent add

SetStyle(ControlStyles.ResizeRedraw | ControlStyles.UserPaint |
    ControlStyles.AllPaintingInWmPaint | ControlStyles.DoubleBuffer, true);

SetStyle(ControlStyles.ResizeRedraw | ControlStyles.UserPaint |
    ControlStyles.AllPaintingInWmPaint | ControlStyles.DoubleBuffer, true);

OnkelTemOP•7mo ago

Thanks! I also asked this question on StackOverflow

OnkelTemOP•7mo ago

https://stackoverflow.com/questions/78546706/graphics-drawstring-doesnt-update-text-in-onpaint-in-windows-forms-c-sharp/78551958#78551958

Stack Overflow

Graphics.DrawString doesn't update text in OnPaint in Windows Forms C#

Sorry if I ask something simple. I asked in Discord and IRC and for two days nobody has provied a solution. I have the following form: public partial class Form1 : Form { public Form1() ...

leowest•7mo ago

no worries, sometimes it takes time to have time to answer some questions, thankfully yours was detailed enough.

MODiX•7mo ago

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DrawString doesn't update text / Windows Forms