LINQ如果在哪裏條件

Question

我想知道是否有可能只在LINQ中如果複選框被選中的條件。

var y = from x in db.RandomTable 
     where /*??if checkbox.Checked=true??*/x.RandomInteger == 0 
     select x; 

Answer 1

var y = from x in db.RandomTable 
    where !checkBox.Checked || x.RandomInteger == 0 
    select x; 

Answer 2

var checked = checkbox.Checked; 

var y = from x in db.RandomTable 
       where !checked || (checked && x.RandomInteger == 0) 
       select x; 

Answer 3

要建立明確的代碼，我會去到語法方向：

var q = db.RandomTable as IQueryable; 
if (checkBox.Checked) 
{ 
    q = q.Where(/* condition */); 
} 
var y = q.Select(/* whatever you want to select */); 

Answer 4

這裏是如何做到這一點

IQueryable qry = db.RandomTable; 

if (Checkbox.Checked) qry = qry.Where(x => x.RandomInteger == 0); 

var result == qry.ToArray();