Error Use Of An Unassigned Local Variable
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Error Use Of Unassigned Local Variable C#
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x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up use of unassigned local variable string Why compile error “Use of unassigned local variable”? up vote 27 down vote favorite 5 My code is the following int tmpCnt; if (name == "Dude") tmpCnt++; Why is there an error Use of unassigned local variable tmpCnt? I know I didn't explicitly initialize it but due to Default Value Table a value type is initialized with 0 anyways. The reference also reminds use of unassigned local variable array me: Remember that using uninitialized variables in C# is not allowed. But why do I have to do it explicitly if it's already done by default? Wouldn't it gain performance if I wouldn't have to do it? Just wondering... c# .net compiler-construction share|improve this question asked Feb 10 '12 at 18:41 theknut 59521231 Can anyone help me with the headline? Couldn't find a fitting for this one :-S –theknut Feb 10 '12 at 18:44 I have a local struct, never initialized, compiles with no errors. Today I created a different struct, treated identically, got "uninitialized local variable error". All its members were set to a value before use, but I could not first set it to null, since it was 'just' a struct. The struct that compiled contained only ints, bools and strings. The one that gave the error also contained DateTimes. "MyStructType myStruct = new MyStructType();" killed the error. Not the first time I've been bitten by missing something a few levels down. –mickeyf Jun 2 at 19:14 add a comment| 9 Answers 9 active oldest votes up vote 55 down vote ac
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the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up C# Error : Use http://stackoverflow.com/questions/9233000/why-compile-error-use-of-unassigned-local-variable of unassigned local variable up vote 6 down vote favorite The error is caused in the for loop : for (i = 0; i < hand.Length; i++) { Console.WriteLine(hand[i]); } I am trying to store the values to be able to display them at a later time. The writeline is there to help me make sure the code actually works as I intend it to. The http://stackoverflow.com/questions/22813697/c-sharp-error-use-of-unassigned-local-variable rest of the code for reference: *edit: added a line of code enum house //variable type for the card type { Spades, Hearts, Clubs, Diamonds } enum cards //variable type for the cards { Joker, Ace, Two, Three, Four, Five, Six, Seven, Eight, Nine, Ten, Jack, Queen, King } class Program { static void Main(string[] args) { Random rnd; Random rnd2; int i; int random; int random2; String[] hand; house randomhouse; cards randomcard; //all declared variables Console.WriteLine("Your hand is made up of :"); for (i = 0; i <= 6; i++)//does everything in the {} until i is equal to 6 { rnd2 = new Random(); random2 = rnd2.Next(0, 14); randomcard = (cards)random2; //selecting a random card from joker to king if (randomcard > (int)cards.Joker) //if the random card isn't a joker { rnd = new Random(); random = rnd.Next(0, 4); randomhouse = (house)random;//selects a random card type Console.WriteLine(randomcard + " of " + randomhouse); //outputs the name of the card System.Threading.Thread.Sleep(1000);//wait 1 second before getting the new card } else { Console.WriteLine(randomcard);//outputs "Joker" System.Threading.Thread.Sleep(1000);//wait 1 second before getting the new card } hand = new String[i];//making a new array value for every lo
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Sign in Pricing Blog Support Search GitHub This repository Watch 889 Star 6,368 Fork 1,522 dotnet/roslyn Code Issues 3,217 Pull requests 135 Projects 0 Wiki Pulse Graphs New issue "Use of unassigned local variable" CS0165 issue #4272 Closed mpmel opened this Issue Jul 31, 2015 · 6 comments Projects None yet Labels Area-Compilers Resolution-By Design Milestone No milestone Assignees No one assigned 5 participants mpmel commented Jul 31, 2015 I'm getting a complaint in my code using VS 2015 and .Net 4.5.2, and am not quite understanding why. If I call MyObject o; if (objects != null && objects.TryGetValue(objectName, out o)) v.Property= o; then everything is fine. The following two cases however give me an error, and I'm not quite understanding why. MyObject o; if (objects != null ? objects.TryGetValue(objectName, out o) : false) v.Property= o; // <-- error CS0165: Use of Unassigned local variable 'o' and MyObject o; bool b; if (objects != null) b = objects.TryGetValue(objectName, out o); else b = false; if (b) v.Property = o; // <-- error CS0165: Use of Unassigned local variable 'o' In either of the last 2 cases, I don't see how o can be used unless TryGetValue is called, which means o should be initialized. Is this a bug? Or I am I missing something? Pilchie added the Area-Compilers label Jul 31, 2015 paul1956 commented Jul 31, 2015 All the VB examples show an explicate initialization of "o", even though the documentation call value an out or