String was not recognized as valid boolean in c#

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1.00/5 (1 vote)

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I have a database which saves user conditions in table and based on that conditions discount is provided.

i have saved data and retirived data from database, and saved this data as string in program .
Now problem is i want to convert this string in boolean format, I have used Convert.toBoolean which throws "string was not recognized as valid boolean expression"
then i have used Boolean.TryParse but it always returns false.
For condition,
61.39>50 && 61.39<70, it returns false but is true.

Can any one provide solution for this??
Thank You

Posted 20-Jan-13 18:04pm

Hetal Jariwala

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Comments

Sergey Alexandrovich Kryukov 21-Jan-13 0:10am

How come you don't show the content of you string on input? Or course, it can be anything and fail the parsing...
—SA

Hetal Jariwala 21-Jan-13 0:18am

i have simply write 61.39>50 && 61.39<70 string in Boolean.TryParse but still it returns false

Sergey Alexandrovich Kryukov 21-Jan-13 1:03am

I see. It is not curable. All wrong, period. You cannot to it at all. Shows total misunderstanding on what a program does, what is code, what is compilation, etc. The only thing is can do is to forget everything you learned about computers and start over... Honestly.
—SA

Hetal Jariwala 21-Jan-13 0:14am

i have simply write 61.39>50 && 61.39<70 string in Boolean.TryParse but still it returns false

Jibesh 21-Jan-13 0:18am

you need to store the result of this expression into a bool variable. I believe tryparse wont execute the expression it just try to convert the string literals to a boolean variable true/false it wont work as you expected you need to rethink about your implementation here

Sergey Alexandrovich Kryukov 21-Jan-13 0:57am

If OP tried that, I have no idea how could we explain anything to such a person... it means no clue what a compiler does, what is code, etc.
—SA

Jibesh 21-Jan-13 1:03am

:) I know. but we have no other choice and we are really lucky so see such a question and answer. lets try if he can able to catch up his mistakes and not to repeat this again in his lifetime.

Sergey Alexandrovich Kryukov 21-Jan-13 1:10am

I have a choice: my idea is to quit this page. I feel nearly anything we say will be a waste of time. I have no guts to discuss such things... :-)
—SA

Jibesh 21-Jan-13 1:07am

MSDN says 'Parse will throws an exception if the string is not equal to the value of Boolean.TrueString or Boolean.FalseString' which means the value should be either "True" or "False" not the expression.

2 solutions

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Sergey Alexandrovich Kryukov · Answer 1 · 2013-01-20T18:09:00

Solution 1

I have no idea why would you need to parse Boolean from string, but you can use bool.Parse or bool.TryParse, but check up your spelling. It should be capitalized "True" or "False".

[EDIT]

Did you try to write something like bool.Parse("61.39>50 && 61.39<70")? Only honestly. :-)

OK, I see. No, this is total gibberish. I'm too shocked to explain why, sorry.

—SA

Posted 20-Jan-13 18:09pm

Sergey Alexandrovich Kryukov

Updated 20-Jan-13 19:04pm

v3

Comments

Hetal Jariwala 21-Jan-13 0:22am

I have tried it but still not working

Sergey Alexandrovich Kryukov 21-Jan-13 0:55am

What do you mean by that, exactly?! (see my update, after [EDIT])
—SA

SoMad 21-Jan-13 1:03am

Your latest edit is how I understand the comments following the question.

Soren Madsen

Sergey Alexandrovich Kryukov 21-Jan-13 1:05am

I see. Updated my post. This is beyond good and evil. I don't have guts to explain why it's wrong, do you? :-)
—SA

SoMad 21-Jan-13 1:12am

I might, but I think if OP follows the first link in Solution 2 and reads it thoroughly, that might be the best way to understand and learn from this.

Soren Madsen

Sergey Alexandrovich Kryukov 21-Jan-13 1:35am

I would say this is very, very optimistic. How about learning what parse does, and what a compiler does, by contrast?
—SA

Jibesh 21-Jan-13 1:14am

:-)

pranathis012 · Answer 2 · 2013-01-20T18:16:00

Solution 2

Hi,

Please read the followings links related to your problem
http://msdn.microsoft.com/en-us/library/system.boolean.tryparse.aspx[^]
string was not recognized as a valid boolean[^]
http://social.msdn.microsoft.com/Forums/en-US/Vsexpressvcs/thread/30b91db2-d989-4d32-a4c0-e2697c240cfb/[^]

Posted 20-Jan-13 18:16pm

pranathis012