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A Local Variable Cannot Be Declared In This Scope Because It Would Give A Different Meaning


What is the definition of "rare language"? edit: Just to clarify, C#'s scope is resolved at the block level, not line-by-line. Removing int will make that line an assignment, which is what you need. That means that the following is true: int t = (t = 5); // OK var s = (s = 10); // Error In the first statement, by the time we this contact form

share|improve this answer edited May 27 '11 at 18:56 answered May 27 '11 at 18:50 Gabe 61.2k594170 Not entirely, i could appear in another nested block and mean something Just above the line marked as showing error you have if (frm2 ==) { frm2.Show(); This is called 'shooting yourself in the foot'. The compiler simply does not differentiate between the following two cases. c# scope share|improve this question edited Jan 13 '10 at 20:08 Sarah Vessels 11.6k20116191 asked Jan 12 '10 at 13:51 IceHeat 2,08862545 3 The actual compiler error is - A

A Local Variable Cannot Be Declared In This Scope Because It Would Give A Different Meaning

string s = "s"; } } } Notice that the only legal hiding action is the first one - you are allowed to redefine x to be a string, because it Browse other questions tagged c# .net or ask your own question. Rahul Jain, Serious Coder 31-Jan-11 13:22pm I Liked your answer.. Are “Referendum” and “Plebiscite” the same in the meaning, or different in the meaning and nuance?

string r = "s"; // Illegal - cannot hide locals. string x; } // (4) Binds to local y. I cannot call var from outside the if, so the error message is wrong, because the first var has no relevance in the second scope. A Local Or Parameter Named 'e' Cannot Be Declared In my previous post about compiler-generated scopes for local variables, I mention the different types of local variables that the compiler allows you to create - catch variables, foreach iteration variables,

The compiler never complains (not it the old days, not sure about newer versions of C++), and the function always returns 0. We cannot report convertibility errors on the right hand side for the two branches of the ternary because we don't have a type for t to report convertibility errors on. Analysis is done purely based on scope, and not order of declaration/use, as you seem to be expecting. http://stackoverflow.com/questions/16263099/error-a-local-variable-cannot-be-declared-in-this-scope string x; y = "s"; // (4) This binds to the local defined below.

It is an error for two members of a local variable declaration space to have the same name. C# Variable Scope asked 3 years ago viewed 4453 times active 3 years ago Linked 0 C# XML remove more lines at once, but attribute values can change Related 0Dotnetzip bad state error when Like this: int choice; do { Console.WriteLine("Hi! If so, why? –Daniel Hilgarth Aug 9 '13 at 6:43 1 @DanielHilgarth: Yes, I think it makes sense.

A Local Or Parameter Name Cannot Be Declared In This Scope

Can I get a dual entry Schengen visa for tourism purpose for me and my wife? https://ericlippert.com/2014/09/25/confusing-errors-for-a-confusing-feature-part-one/ It's used in the condition of his loop; a declaration made inside the loop body will not be visible there. –Ben Voigt Feb 8 '13 at 21:18 @BenVoigt oops, A Local Variable Cannot Be Declared In This Scope Because It Would Give A Different Meaning forform2Property is the property of the Form1, not Form2. Cannot Be Declared In This Scope Because That Name Is Used In An Enclosing Local Scope Find the function given its Fourier series In a company crossing multiple timezones, is it rude to send a co-worker a work email in the middle of the night?

Nothing earth shattering really, but isn't this just plain wrong? Should the first IF scope not be completeley seperate from the rest of the method? Your question is tagged as .net and as c. I think the C# guys decided that it's better to throw a warning/error since it's, in the vast majority of cases, a bug rather than something the coder actually want. A Local Or Parameter Cannot Be Declared In This Scope

What should I do when the boss "pulls rank" to get their problems solved over our customers' problems? The needed feature is simply not implemented –Rune FS Jan 12 '10 at 14:16 3 By the way, you said in a comment on a deleted post that a conditional more stack exchange communities company blog Stack Exchange Inbox Reputation and Badges sign up log in tour help Tour Start here for a quick overview of the site Help Center Detailed navigate here You don't need to re-declare it, you just want to assign it.

Application Lifecycle> Running a Business Sales / Marketing Collaboration / Beta Testing Work Issues Design and Architecture ASP.NET JavaScript C / C++ / MFC> ATL / WTL / STL Managed C++/CLI Draw some mountain peaks Why didn’t Japan attack the West Coast of the United States during World War II? Now enter the temp."); int celcius = Convert.ToInt32(Console.ReadLine()); //next line use the formula and show answer } if (choice == 2) { Console.WriteLine("Great, you chose F to C.

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Why is C# unable to differentiate between the two scopes? Since changing your example to: static void Main() { int i; { int i; } } would cause the scopes of the different i variables to overlap, your example is illegal. Here's an interesting discussion on what parts of the specification this error comes from. static main() { { int i = 0; } //i is not accessible here because it is declared in the different block. } With this, no two variables with the

This is the big day, with Visual Studio 2008 Reply Follow UsPopular TagsC# 4.0 Overload Resolution Dynamic Runtime binding CLR Default parameters COM Named arguments Interop Optional arguments Generics DLR Channel The 1st declaration, in the inner block is illegal because it inherits the namespace ('local variable declaration space' in ISO-speak) of the containing block. Connect with top rated Experts 12 Experts available now in Live! For block).

From section 8.5.1: The scope of a local variable declared in a local-variable-declaration is the block in which the declaration occurs. Not the answer you're looking for? share|improve this answer edited Jan 12 '10 at 14:16 answered Jan 12 '10 at 13:56 Mats Fredriksson 12k62852 good point, I hadn't considered this as a possible explanation –Stefan On 1941 Dec 7, could Japan have destroyed the Panama Canal instead of Pearl Harbor in a surprise attack?

It is possible for two nested blocks to contain elements with the same name as long as neither block contains the other. Saying that overlapping scopes aren't allowed is sort of beside the point. –Gabe May 27 '11 at 18:59 Not only forbidden or purpose, but I thought it was interesting Covered by US Patent. How to harness Jupiter's gravitational energy?

That language might have different rules than C. Variable scoping and pointers Vb.net variable scope Declare local variable in Sqlite query Why does " ‘x’ and 'y' was not declared in this scope" this error seem? Is it possible to write division equation in more rows? Error, usage before declaration.

Therefore, rules about the contents of the outer block apply to the contents of the inner block. namespace TemperatureApp { class Program { static void Main(string[] args) { int choice; do { Console.WriteLine("Hi! Why did the best potions master have greasy hair? As a result, the first declaration is not allowed as it steps on the second declaration (even though any references to the second declaration would be illegal: you'd get another compiler

Is adding the ‘tbl’ prefix to table names really a problem? Names are introduced into this declaration space through local-variable-declarations and local-constant declarations. But in a code that follows the example given by the OP, what would you see as confusing here?

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