Can't reference non-static object from field initializer [duplicate]

Question

I wrote this code:

public partial class Form1 : Form
{
    ThreadStart ts = new ThreadStart(fun1);
    public Thread t1 = new Thread(ts);
    public void fun1()
    {
        DA da = new DA();

        string q = "select * from G5_table order by State";

        DataTable dt = da.Select(q);
        foreach (DataRow item in dt.Rows)
        {
            richtxtboxEN.Text = item["Word_en"].ToString();
            mode = 1;
            richtxtboxEN.TextChanged += new EventHandler(richtxtboxEN_TextChanged);
        }
    }
    private void Form1_Shown(object sender, EventArgs e)
    {     
        t1.Start();
    }
}

but i have a error field initializer cannot reference the non-static field, method, or property 'G5.Form1.fun1()

What is the connection between that error and the title?

Jeroen Vannevel
– Jeroen Vannevel

2013-07-26 01:15:28 +00:00
Commented Jul 26, 2013 at 1:15 — Jeroen Vannevel
– Jeroen Vannevel, Commented Jul 26, 2013 at 1:15

Maximum Cookie · Accepted Answer · 2013-07-26 01:20:58Z

2

You cannot access a non-static method within a field initializer like you are doing here:

ThreadStart ts = new ThreadStart(fun1);

You will need to define a constructor instead, like this:

public partial class Form1 : Form
{
    public Form1()
    {
        ts = new ThreadStart(fun1);
        t1 = new Thread(ts);
    }

    ThreadStart ts;
    public Thread t1;

answered Jul 26, 2013 at 1:20

Maximum Cookie

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1 Comment

caesay Over a year ago

What was wrong with my answer, that was posted 5 minutes before? You are saying the exact same thing.

caesay · Accepted Answer · 2013-07-26 01:21:07Z

2

Change your Form1_Shown to this:

private void Form1_Shown(object sender, EventArgs e)
{   
    t1 = new Thread(new ThreadStart(fun1));  
    t1.Start();
}

then change t1 to this:

public Thread t1;

and remove ts from your class completely.

The error, is that you cant reference non-static things in field initializers. And that even includes other class-level fields.

And for clarification, a field initializer is this:

public Thread t1 = new Thread(ts);

Since Thread t1 is not a property, and is defined at class-level (outside of a method), it is a field, and it is being initialized right there in the declaration. It is referencing ts which is a non-static field, and you can not do this.

edited Jul 26, 2013 at 1:21

answered Jul 26, 2013 at 1:15

caesay

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