Error 1 Use Of Unassigned Local Variable C#
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Use Of Unassigned Local Variable C# Array
with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow use of unassigned local variable c# for loop 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 of unassigned local variable up vote 22 down vote
Use Of Unassigned Local Variable C# String
favorite 1 I'm not sure why I'm getting this error, but shouldn't this code compile, since I'm already checking to see if queue is getting initialized? public static void Main(String[] args) { Byte maxSize; Queue queue; if(args.Length != 0) { if(Byte.TryParse(args[0], out maxSize)) queue = new Queue(){MaxSize = maxSize}; else Environment.Exit(0); } else { Environment.Exit(0); } for(Byte j = 0; j < queue.MaxSize; j++) queue.Insert(j); for(Byte j = 0; use of unassigned local variable c# decimal j < queue.MaxSize; j++) Console.WriteLine(queue.Remove()); } So if queue is not initialized, then the for loops aren't reachable right? Since the program already terminates with Environment.Exit(0)? Hope ya'll can give me some pointers :) Thanks. c# initialization share|improve this question edited Nov 2 '08 at 0:17 Blair Conrad 98.6k17106100 asked Nov 1 '08 at 20:33 jkidv 1,11131212 6 I can't give you any pointers, but I hope you can get a handle on this one. –wprl Nov 1 '08 at 20:40 add a comment| 5 Answers 5 active oldest votes up vote 65 down vote accepted The compiler doesn't know that the Environment.Exit() is going to terminate the program; it just sees you executing a static method on a class. Just initialize queue to null when you declare it. Queue queue = null; share|improve this answer edited Mar 9 '13 at 1:14 Zaid Masud 7,20634369 answered Nov 1 '08 at 20:35 tvanfosson 351k65570700 add a comment| up vote 9 down vote The compiler doesn't know that Environment.Exit() does not return. Why not just "return" from Main()? share|improve this answer answered Nov 1 '08 at 20:35 Brian 95.3k11188265 I prefer to use Environment.Exit with a non-zero error status in case the program is called
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Use Of Unassigned Local Variable C# Struct
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Use Of Unassigned Local Variable C# Unity
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 use of unassigned local variable c# list only takes a minute: Sign up Fixing the 'Use of unassigned local variable' with a null assignment. Why? up vote 17 down vote favorite 1 With a piece of code like this, the compiler complains on c.MyProperty: MyClass c; try http://stackoverflow.com/questions/256073/c-sharp-error-use-of-unassigned-local-variable { throw new Exception(); } catch (Exception) { } c.MyProperty = 2; // "Use of unassigned local variable 'c'". Yet it doesn't complain if you assign a null to c in initialization: MyClass c = null; try { throw new Exception(); } catch (Exception) { } c.MyProperty = 2; // no complains this time. So, why does this work? If c wasn't assigned a null and the compiler hypothetically allowed it, wouldn't the same exception be thrown at c.MyProperty, Object http://stackoverflow.com/questions/6213113/fixing-the-use-of-unassigned-local-variable-with-a-null-assignment-why reference not set to an instance of an object? c# exception variable-assignment share|improve this question asked Jun 2 '11 at 10:10 Andreas Grech 51.9k81248326 Hmm, that is interesting, my guess would be though that this code (second version) would still throw an exception at Runtime.. it's likely just a visual studio issue that is not picking up the null assignment - Just a guess ? –Dave Long Jun 2 '11 at 10:13 1 Take a look to stackoverflow.com/questions/4770426/… –Haplo Jun 2 '11 at 10:17 add a comment| 4 Answers 4 active oldest votes up vote 37 down vote accepted When you assign null to the variable you're telling the compiler to back off because you know better than him so he should not complain about this. This is probably due to the fact that assigning null is considered to imply an explicit action by the developer. share|improve this answer answered Jun 2 '11 at 10:12 Joao Angelo 31k57598 1 Although that made me laugh, I'm still not closer to an answer. –Andreas Grech Jun 2 '11 at 10:13 6 @Andreas: This is the actual answer, this is why it is allowed. C# will let you intentionally shoot your self in the foot. It just won't let you do it unintentionally. –Binary Worrier Jun 2 '11 at 10:17 Although the way I answered was meant to add some humor to my opinion
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