Application of TryParse in C#

Question

When 'val' below is not a bool I get an exception, I believe I can use TryParse but I'm not sure how best to use it with my code below. Can anyone help?

checkBox.Checked = Convert.ToBoolean(val);

Thanks

Solution 1

The code is as follows to determine whether the string val is a valid Boolean value and use it to set the Checked property if so. You need to decide what action you would take if it does not represent a valid value.

bool result;
if (bool.TryParse(val, out result))
{
    // val does represent a Boolean
    checkBox.Checked = result;
}
else
{
    // val does not represent a Boolean
}

Solution 2

Assuming that if its not a valid boolean, you don't want it checked:

bool result = false;
bool.TryParse(val, out result);
checkBox.Checked = result;

Solution 3

bool z = false;
if(Boolean.TryParse(val, out z))
{
  checkBox.Checked = z;
}

Just a note: Parse and convert are different operations and may lead to different results.

Comments

[Servy]

1) This doesn't answer the question that is asked here. 2) If you find yourself posting the same answer to lots of different questions you're doing something wrong. Either the questions really are different and the answer doesn't apply to all of them (which is the case here), or the questions are duplicates and should just have all but one closed as a duplicate of the best one.

[Mick Bruno]

I think that this is a valid reply to the question. They asked why TryParse didn't work, I gave a routine that would do what they wanted. Perhaps I should have added the usage: bool shouldCheck; TryParseBool(val, out shouldCheck); checkBox.Checked = shouldCheck;