CODEWITHSUNDEEP
c#initializationdrawing
AJH
AJH

Reputation: 546

c# drawing doesn't work right after form Initialized

i tried to draw some boxes right after form is Initialized
however they didn't appeared. i put the code under the InitializeComponent(); like this

    public Form2()
    {   InitializeComponent();
        System.Drawing.SolidBrush myBrush = new System.Drawing.SolidBrush(System.Drawing.Color.LimeGreen);
        System.Drawing.Graphics formGraphics = this.CreateGraphics();
       formGraphics.FillRectangle(myBrush, new Rectangle(0, 0, 200, 300)); }

but when i drew them after the form is initialized they worked!
So i thought i should wait a moment and draw the boxes.
Then i put the thread to make the draw function wait for 10ms
In short i modified the code like this

public Form2()
    {
        InitializeComponent();


        Thread t1 = new Thread(new ThreadStart(Run));
        t1.Start();
    }

    void Run()
    {
        Thread.Sleep(10);
        System.Drawing.SolidBrush myBrush = new System.Drawing.SolidBrush(System.Drawing.Color.LimeGreen);
        System.Drawing.Graphics formGraphics = this.CreateGraphics();
            formGraphics.FillRectangle(myBrush, new Rectangle(0, 0, 200, 300));
    }

and i succeed So my question is why i have to wait for a moment to draw something right after the form is initialized?
and is there any way to solve this problem not using thread?

Upvotes: 1

Views: 1296

Answers (2)

AJH
AJH

Reputation: 546

using paint event works plus don't use CreateGraphics instead use e.Graphics

Upvotes: 0

interceptwind
interceptwind

Reputation: 675

I find your question interesting and did some experiments myself. I managed to get it to work in Form1_Paint callback :)

public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();
        this.Paint += new System.Windows.Forms.PaintEventHandler(this.Form1_Paint);
    }

    private void Form1_Paint(object sender, PaintEventArgs e)
    {
        System.Drawing.SolidBrush myBrush = new System.Drawing.SolidBrush(System.Drawing.Color.LimeGreen);
        System.Drawing.Graphics formGraphics = e.Graphics; //this.CreateGraphics();
        formGraphics.FillRectangle(myBrush, new Rectangle(0, 0, 200, 300));
    }
}

Edit: Edited based on Idle_Mind's comment

Upvotes: 1

Related Questions