实例变量的值默认为0，

Question

public ActionResult Edit(int country_id = 0)       
{  
    tbl_country Data = db.tbl_country.Find(country_id);
    int a = country_id;
    create_tbl_country c = new create_tbl_country();
    c.country_name = Data.country_name;
    c.country_id = 1; // here taking value of c.country_id=0 
    return View(c);
}

Answer 1

仅使用“id”更改“country_id”。