默认情况下取值为0的实例变量的值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”。