I am writing a very simple Win Form app.
One PictureBox (named ViewPicBox) in the main form (named ViewForm). In
the constructor of ViewForm, I set the Image property of ViewPicBox.
ViewForm()
{
InitializeComponent(); // auto generated by VS2005
ViewPocBox.Image = Image.FromFile(@"C:\abc.jpg");
}
After Ctrl+F5, it works fine and display the image.
Then I tried to use Graphics and modify the code to be:
ViewForm()
{
InitializeComponent(); // auto generated by VS2005
drawImage(@"C:\abc.jpg");
}
void drawImage(string fileName)
{
Image pic = Image.FromFile(fileName);
Graphics graph = ViewPicBox.CreateGraphics();
graph.DrawImage(pic, 0, 0, pic.Width, pic.Height);
graph.Dispose();
pic.Dispose();
}
It will not diplay the image after launched. I tried to call drawImage
in menu item event handler, it works fine. So, I suppose there is
something happened after ViewForm constructor that clear the content of
ViewPicBox.
Anyone knows what happens after the form constructor?
