如何制作一种可以从C＃中的任何线程更改任何文本框的文本属性的方法？

Question

I am not a really good C# programmer. I am used to C but not C#.

I know that from a thread other than UI thread we cannot change the property of textbox and labels.

So after trying few different ways I am using this method all the time:

 item.Invoke(new EventHandler(delegate
            {
                item.Text = text;
            }));

Then after writing some code I noticed it is boring and inefficient to do this every single time, so I made a method:

static void change_text_from_different_thread(TextBox item, string text)
        {
            item.Invoke(new EventHandler(delegate
            {
                item.Text = text;
            }));

        }

then I tried to use this in my thread the problem is that I can't send the TextBox from the thread.

let's say this is my thread:

{

change_text_from_different_thread(textbox1,"Hi");

}

then I get this error:

An object reference is required for the non-static field, method, or property

So could you tell me how I can pass the textbox? BTW there is a chance that my invoke method is wrong or very dangerous, but I could not find a easier way. If it is really bad, please let me know. If it is okay, also let me know. If by using another method things get better and easier please do let me know as well.

It is my first time asking question, sorry if I have missed some thing. Thank you very much.

This is my method:

static void gyro_self_check_thread_function()
{
//lab lab
}

this is how I made a thread and start it:

private void Gyro_self_check_button_Click(object sender, EventArgs e)
        {

            Gyro_self_check_status_label.Text = "Status: Checking....";
            gyro_self_testing_groupBox.Update();
            _serialPort.Write(Protocal_Values.gyro_self_checking_request, 0, 2);


            Thread gyro_self_check_thread = new Thread(gyro_self_check_thread_function);
            gyro_self_check_thread.Start();

            //Thread gyro_self_check_thread = new Thread(gyro_self_check_thread);
            //gyro_self_check_thread.Start();



        }

Answer 1

Looks like your thread method is also static and textbox1 is a non-static field, so it cannot be accessed from static method.

If this is the case, then you can make your thread method non-static and it should compile.

Answer 2

As another posted commented, this is probably an issue with static vs. non-static access. To alleviate this problem, you might be able to write this as an extension method on TextBox:

static class ExtensionMethods
{
     static void change_text_from_different_thread(this TextBox item, string text)
     {
         item.Invoke(new EventHandler(delegate
             {
                 item.Text = text;
             }));

     }
}

Then you call it like so:

textbox1.change_text_from_different_thread("Hi");