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The following is the way we are suppose to update GUI components:
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- delegate void textIt(object o);
- public partial class Form1 : Form
- {
- public Form1()
- {
- InitializeComponent();
- }
- private void Form1_Load(object sender, EventArgs e)
- {
- //Main Thread
- Label l = new System.Windows.Forms.Label();
- this.Controls.Add(l);
- System.Threading.Thread testThread = new System.Threading.Thread(new System.Threading.ParameterizedThreadStart(testStart));
- testThread.Start(l);
- }
- private void testStart(object o)
- {
- //testThread
- if (((Label)o).InvokeRequired)
- {
- textIt t = new textIt(testStart);
- this.Invoke(t, o);
- }
- else
- {
- ((Label)o).Text = "TEST";
- }
- }
- }
If I delete the delegate and change the method testStart(object o) to:
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- private void testStart(object o)
- {
- ((Label)o).Text = "TEST";
- }
I have read that the properties cannot be changed by any thread other then the one that created it. Is that a suggestion or a fact? If it is a suggestion, then what could go wrong? If it is a fact then how is it that I have been accessing the properties directly from different threads? does the compiler rewrite the code so that it does call Invoke?
