切换大小写或其他

Question

I have this long loop of if..else. Can anybody help me in knowing if "switch case" is better for this or "if..else"?

if (meals == null)
{
    bfast.Hide();
    lunch_rb.Hide();
    dinner_rb.Hide();
}
else if (meals != null)
{
    if (breakfast != null && lunch == null && dinner == null)
    {
        lunch_rb.Hide();
        dinner_rb.Hide();
    }
    if (breakfast == null && lunch != null && dinner == null)
    {
        bfast.Hide();
        dinner_rb.Hide();
    }
    if (breakfast == null && lunch == null && dinner != null)
    {
        bfast.Hide();
        lunch_rb.Hide();
    }
    if (breakfast != null && lunch != null && dinner == null)
    {
        dinner_rb.Hide();
    }
    if (breakfast != null && lunch == null && dinner != null)
    {
        lunch_rb.Hide();
    }
    if (lunch != null && breakfast == null && dinner != null)
    {
        bfast.Hide();
    }

I am developing an application for windows CE 5.0 (if this helps)

Answer 1

I think the better solution in this case is:

if (breakfast == null)
  bfast.Hide();
if (lunch == null)
  lunch_rb.Hide();
if (dinner == null)
  dinner_rb.Hide();

Answer 2

You can try something like this, As you have condition on multiple variables you will need to make expression for passing it to switch so using if as given below might make it simple.

if (breakfast == null)
      bfast.Hide();

if (lunch == null)
      lunch_rb.Hide();

if (dinner == null)
      dinner_rb.Hide();

Answer 3

对于这种特殊情况，if-else更好，因为您具有复杂的条件，而我相信切换情况是无法做到的。

Answer 4

For this question, I think if...else is good enough. switch...case cannot deal with such a complicated situation. Feel free to use it.

Answer 5

Switch case总是比if ... else if更好，因为它需要更少的输入，并且您的代码将更易于阅读和理解。当我忘记考试中的switch样式时，我自己只是使用“ else if”！

Answer 6

The performance level between if and switch statements is not much difference. Anyway your code is a mess of conditions. Take into consideration the answer of Pigueiras. Something like

bfast.Hide();
lunch_rb.Hide();
dinner_rb.Hide();
if (meals != null) {
  if (breakfast != null)
    bfast.Show();
  if (lunch =! null)
    lunch_rb.Show();
  if (dinner =! null)
    dinner_rb.Show();
}