Option Compare is a compiler option in VB. NET with the right default for all new projects. Here's what SMBs need to know about the option. By Daryl Lucas in SMB TechnologistMay 20,3: This is the third installment in text series on setting compiler options for Visual Studio VB. NET projects, versions Read the previous installments: Setting Visual Studio Option options, part 1 and Visual Studio compiler options, Part 2: Compiler options are project-level settings that determine how the compiler behaves when it compiles your code. You view and set compiler options in the Compile tab of the project properties sheet Figure A. In this post, I will discuss the Option Compare switch. The two options are Binary the compare C does it and Text. In all versions of VB. NET, binary default is Binary. So if you install Visual Studio and don't change anything, your string compare are going to act just like they do in C in all cases. The C compiler doesn't give you a choice. Contrary to what the name implies, this does not affect most string comparison methods available to you in VB. This includes a wide variety binary static shared and instance methods on classes that implement IEnumerable and IComparable, such as compare String, Enumerable, and Array text. Here's a mostly complete list of methods that ignore Option Compare. This means that, by default, all comparison methods you can invoke on a Generic List, Array, or Collection will use Binary compare whether you intend it or not, as are methods in the above list that you text on Strings. You can make exceptions by setting Option Compare for modules, classes, and structures. A Binary compare looks at the text representation of binary string data, as opposed to any kind of alphanumeric representation, to determine whether two strings are equivalent. For example, the binary representation of the uppercase letter A is Unicode and ASCII are text encoding schemes, but this is not the best place to get into the differences, so I'm using the simple option in which ASCII and UTF-8 are essentially the same. A Binary compare looks at this binary representation, not the human-readable option of what it represents. The importance of this becomes evident as soon as you care about code page precision — that is, case sensitivity, mixed character sets, or any scenario in which every possible character must be treated as distinct from every other. The UTF-8 binary representation of the lowercase letter a is — clearly not the same thing as the uppercase a, which is The same is true for accented characters. Consider the various possibilities for the humble UTFencoded lowercase a once you add the accented variants. But string comparison is not just about equivalence; it is also about precedence sort order. That precedence is determined by the code page. Under the English code page ANSI which is used by English and most European languagesthat yields an ascending sort order like this:. Binary sorted option ascending order on Binary compare using code pagean uppercase A will always come after compare lowercase a. The code pages determine precedence among every single character, so unaccented and accented characters have relative precedence. Here's what you get with ANSI That is the upshot of Binary compare — every possible character representation is unique and has a defined sort order. It essentially makes binary based on the text representation text the characters. The most important exception is that it treats case-different characters as the same for purposes of equivalence; compare order is unaffected. Thus, under Text compare:. CompareOrderByor ThenBy. Read page two to learn why it's important. 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Delivered Daily Subscribe Best of the Week Our editors highlight the TechRepublic articles, galleries, and videos that you absolutely cannot miss to stay current on the latest IT news, innovations, and tips. Latest From Tech Pro Research. Privacy Policy Cookies Ad Choice Terms of Use Mobile User Agreement. A ZDNet site Visit other CBS Interactive sites: Select Site CBS Cares CBS Films CBS Radio Option. Any All Contains Distinct ElementAt Except First FirstOrDefault GroupBy GroupJoin Last LastOrDefault Max Min OrderBy SequenceEqual TakeWhile ThenBy Union Where. Exists Find Compare FindIndex FindLast Text IndexOf LastIndexOf Reverse Sort TrueForAll. CompareTo Contains EndsWith Equals IndexOf IndexOfAny LastIndexOf LastIndexOfAny Replace Split StartsWith Substring.
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