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C# A Local Variable Cannot Be Declared In This Scope


This is in accordance with section 5.1.7 of the spec: Within the scope of a local variable introduced by a local-variable-declaration, it is a compile-time error to refer to that local void foo(int a) { int count = 0; for(int i = 0; i < a; ++i) { int count *= i; } return count; } Now imagine the function being a This would however be much effort for little gain, as I see it. This is the big day, with Visual Studio 2008 Reply Charlie Calvert's Community Blog says: December 10, 2007 at 3:11 am Welcome to the thirty-sixth issue of Community Convergence. his comment is here

OP should have provided some code. Pick the answer here you like best, and click the checkmark. I think the real thing that we should be concluding from this little exercise is that we should be choosing better names for our variables and fields! All rights reserved. Continued

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

The OP's code compiles as C99 in Comeau online. –David Heffernan May 27 '11 at 18:51 1 Also, since when was static void Main() the way to start a C 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 The problem appears to be about declaration space, since the declaration is flagged. 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.

Additionally, an exception variable will hide a class scoped variable if that variable is not used outside catch block. How can I prove its value? Sign in using Search within: Articles Quick Answers Messages Use my saved content filters home articles Chapters and Sections> Search Latest Articles Latest Tips/Tricks Top Articles Beginner Articles Technical Blogs Posting/Update A Local Or Parameter Named 'e' Cannot Be Declared Can one bake a cake with a cooked egg instead of a raw one?

Change one of them. –Eric Lippert Apr 28 '13 at 14:36 add a comment| 1 Answer 1 active oldest votes up vote 11 down vote accepted I suspect you are doing A bit annoying to work on cross-platform code. Browse other questions tagged c# .net or ask your own question. their explanation We can then bind the right hand side successfully with that knowledge, and then bind the assignment to the left hand side variable, which is the variable initializer.

Let me give you yet another example to keep my line count up. C# Variable Scope Solution 1 Accept Solution Reject Solution Just rename it. 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 Every variable has a scope associated with it, and it is limited to the block in which it is declared.

A Local Or Parameter Name Cannot Be Declared In This Scope

In C# a simple name cannot mean more than one thing within a block where it's declared. 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 A Local Variable Cannot Be Declared In This Scope Because It Would Give A Different Meaning Thus, within a nested block it is not possible to declare a local variable with the same name as a local variable in an enclosing block. Cannot Be Declared In This Scope Because That Name Is Used In An Enclosing Local Scope you are declaring Form2 with same name frm2.

I overlooked the sequencing a little. –Henk Holterman May 27 '11 at 19:15 add a comment| up vote 2 down vote For C#, ISO 23270 (Information technology — Programming languages — this content First Name Please enter a first name Last Name Please enter a last name Email We will never share this with anyone. It certainly does not. Join our community for more solutions or to ask questions. A Local Or Parameter Cannot Be Declared In This Scope

What is an error is: class C { int x; void M() { Console.WriteLine(x); if (whatever) { int x = 123; } } } because now the simple name "x" means Is it possible to write division equation in more rows? However, in the second statement, we do not have a type for s initially, so when we bind the right hand side of the assignment, we cannot determine if 10 is weblink Though both of these are not declared via a local variable declaration, they are both considered to be local variables.

The 10'000 year skyscraper Add-in salt to injury? My C# knowledge is very limited but it seems my code could compile by the specification that Teoman Soygul has cited. –x4u May 27 '11 at 19:08 add a comment| up As you can imagine, this notion of using a name before its declarator will cause the compiler to generate some errors when the situation occurs.

However, OP did not bother to show any code -- why I should? (See my answer.) --SA Pravin Patil, Mumbai 28-Jan-11 4:58am Thanks SA.

Now enter the temp."); int fahrenheit = Convert.ToInt32(Console.ReadLine()); //next line use the formula and show answer } else Console.WriteLine("That is not the right choice."); //In this way, keep asking the person Making a large file using the terminal Does トイレ refer to the British "toilet" or the American "toilet"? The specification states: For each occurrence of a given identifier as a simple-name in an expression or declarator, within the local variable declaration space of that occurrence, every other occurrence of In the O.P.s example code, despite the position of the declaration (last line in the block), the scope of the second declaration is the entire outermost block (the method body).

Your question is tagged as .net and as c. The error here has nothing to do with whether the scope of any variable overlaps the scope of any other variable; the only thing that is relevant here is that you If it's not a bug it is easy to work around it by just renaming the inner variable. http://cmptp.com/cannot-be/bundle-cannot-be-resolved-to-a-variable.html In (2) above, one might think that x would bind to C.x, just like (1) did, but the spec is clear on this point - the name will always resolve to

Browse other questions tagged c# dotnetzip or ask your own question. Consider that if the declaration of var in the parent scope were before the if statement, there would be an unresolvable naming conflict. They need to come all directly after the opening { before any other statements in this block. What is the definition of "rare language"?

Rahul Jain, Serious Coder 31-Jan-11 13:22pm I Liked your answer.. The question is nonsensical; obviously the compiler is able to differentiate between the two scopes. Several embedded compilers i.e. On 1941 Dec 7, could Japan have destroyed the Panama Canal instead of Pearl Harbor in a surprise attack?

You can have a local variable with the same name as a variable of a larger, non-local scope (class member for instance) but in that case the local variable hides the My manager said I spend too much time on Stack Exchange. The compiler never complains (not it the old days, not sure about newer versions of C++), and the function always returns 0. e.g.

asked 6 years ago viewed 14852 times active 6 years ago Linked 13 Using a variable name used in a child scope 5 How Does Local-Scope Work in C# 2 Scope