CODEWITHSUNDEEP
c#multithreadingcomboboxinvoke
guitarPH
guitarPH

Reputation: 201

How to invoke code for use in a thread

Hi I want to use my code below for a thread. I have some example code for invoke but I dont know how to do it when it comes to my combo box selected item going to string.

This is what I have: 

//My code
string cb1 = comboBox1.Items[comboBox1.SelectedIndex].ToString();

//Example 1
textBox2.Invoke((Action)(() => textBox2.Text = ""));

//Example 2
textbox2.Invoke((MethodInvoker)(delegate()
{
    //do something
}));

Upvotes: 1

Views: 1512

Answers (2)

Adil
Adil

Reputation: 148150

string newValue = "hi there";

if (textBox.InvokeRequired)
    textBox.Invoke((MethodInvoker)delegate { textBox.Text = newValue; });
else
    textBox.Text = newValue;

For particular code asked in question we can do it like 

MethodInvoker mi = delegate
{
     string cb1 = comboBox1.Items[comboBox1.SelectedIndex].ToString();
};
if (InvokeRequired)
   this.BeginInvoke(mi);
else
   mi.Invoke();

Upvotes: 2

Jason Down
Jason Down

Reputation: 22171

Try this one if you want to go with Example 1 (using a Func<string> delegate instead of an Action delegate):

string cb1 = comboBox1.Invoke((Func<string>) (() => comboBox1.Items[comboBox1.SelectedIndex].ToString())) as string;

Upvotes: 5

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