Question

I’m sorry to ask such an easy question.. I just need some clarifications, because sometimes I mix the differences up.

Can somebody please help me by explaining the difference between the following if statements?

sending = true;
if (sending && e.AssetType == AssetType.Notecard) //#1

vs.

if ((sending) && (e.AssetType == AssetType.Notecard)) //#2

vs.

if (sending || e.AssetType == AssetType.Notecard) //#3

vs.

if ((sending) || (e.AssetType == AssetType.Notecard)) //#4

In this specific case, I need it to evaluate to something like:
“If(sending == true AND e.AssetType == AssetType.Notecard)”

In an other case I need the if statement to check one string and contents of a list like:
“If(string == “Name” OR List.Contains(“string”))

Answer 1

The first and the second statements are the same (parenthesis are not obligatory in this case, because of C# evaluation priorities!)

if (sending && e.AssetType == AssetType.Notecard)
if ((sending) && (e.AssetType == AssetType.Notecard))

just as:

if ((sending == true) && e.AssetType == AssetType.Notecard))
if ((sending) && (e.AssetType == AssetType.Notecard))

Also the 3° and the 4° statement will give the same result, for the same reason mentioned above: http://msdn.microsoft.com/en-us/library/6a71f45d.aspx

I would use these statements:

if (sending && (e.AssetType == AssetType.Notecard))

and:

if ((string == "Name") || List.Contains("string"))

(but please take care of string comparison modes, such as upper/lower cases and cultures:

String.Compare(string, "Name", StringComparison.CurrentCultureIgnoreCase) == 0

compares strings without regard of the case and with the current culture)