Building one of my first console apps.
This console app will run some stored procedures I'm defining. I would like to be able to pass in parameter values via the command line.
Is there any way to pass in a name value pair? For example:
myConsoleApp.exe sproc_GetLastActives, #LastActiveDate - 11/20/2009
I know how to retreive the parameter values, but I'm noticing that the args[] are split if I put in a / or a ,. How can I pass in name value pair?
Thanks!
Do you want that in a single string? Try this:
myConsoleApp.exe "sproc_GetLastActives, #LastActiveDate - 11/20/2009"
(i.e. just add quotes)
Slashes and commas shouldn't affect things, but the command line parser splits on spaces unless you've quoted it.
There are several solutions to this problem the most common is to use '/' or '-' to prefix parameters and = to delimit them from their arguments for example
consoleapp.exe /spname=sproc_GetLastActives /LastActiveDate="11/20/2009"
in your code your code you can use String.Split(arg[i], new char[] {'='}) to bust up the individual parameters.
consoleapp.exe key1 val1 key2 val2
args[] gives your 4 items, pair them up in your code. :P
Similar to mykhaylo's response, why not pass in the values at one string:
consoleapp.exe sproc_name key1=value1 "key2=Value With Spaces" key3=value3
Then just test for the presence of the = sign and parse it to get your key/value pair.
Related
I have an existing console app that takes option args that don't have the -- in front of them. For example:
./myapp businessDate=20230128 type=charley location=nashville
Currently I parse the args[] array tokens and split them around the "=" to get the key/value
I can't change that, because other programs already call it that way. But it appears that DragonFruit needs to have it this way instead.
./myapp --businessDate=20230128 type=charley --location=nashville
So my question is, can DragonFruit be configured to NOT use the -- prefix on options when I use the equals sign to separate the key from the value the way I currently do it in the example above? I believe the answer is "no", because of the Posix compliance. But maybe I missed something.
What I Tried
I ran the example program here Building your first app with System.CommandLine.DragonFruit And it worked fine when I ran it:
$ dotnet run --int-option=123 --bool-option=true
The value for --int-option is: 123
The value for --bool-option is: True
The value for --file-option is: null
But when I tried it without the --, this way instead, it gave me errors, and I was hoping it would work as above:
$ dotnet run int-option=123 bool-option=true
Unrecognized command or argument 'int-option=123'.
Unrecognized command or argument 'bool-option=true'.
I have a string as shown below
string names = "<?startname; Max?><?startname; Alex?><?startname; Rudy?>";
is there any way I can split this string and add Max , Alex and Rudy into a separate list ?
Sure, split on two strings (all that consistently comes before, and all that consistently comes after) and specify that you want Split to remove the empties:
var r = names.Split(new[]{ "<?startname; ", "?>" }, StringSplitOptions.RemoveEmptyEntries);
If you take out the RemoveEmptyEntries it will give you a more clear idea of how the splitting is working, but in essence without it you'd get your names interspersed with array entries that are empty strings because split found a delimiter (the <?...) immediately following another (the ?>) with an empty string between the delimiters
You can read the volumes of info about this form of split here - that's a direct link to netcore3.1, you can change your version in the table of contents - this variant of Split has been available since framework2.0
You did also say "add to a separate list" - didn't see any code for that so I guess you will either be happy to proceed with r here being "a separate list" (an array actually, but probably adequately equivalent and easy to convert with LINQ's ToList() if not) or if you have another list of names (that really is a List<string>) then you can thatList.AddRange(r) it
Another Idea is to use Regex
The following regex should work :
(?<=; )(.*?)(?=\s*\?>)
I have been developing an application that one of it's responsability is provide to user an page that it's possible to write math expression in EXCEL WAY.
It is an application in ASP.NET MVC, and it's use the SpreadSheetGear library to EXECUTE excel expression.
As it's show below, The page has an texarea to write expression and two button on the right. The green one is for VALIDATE THE EXPRESSION and the red one is for clean textarea.
A,B,C are parameter, that application will replace for values. Notice that it is not possible to know the parameter data type. I mean, if I write a concatenate function, It is necessary that user use double quotes (") to delimitate string. For example
CONCATENATE("A","B") thus, is necessary that user KNOW functions parameters and its correlate data types.
My main issue is how to validate the expression?
SpreadSheetGear there isn't any method to perform this validation.
The method spreadsheetgear provides to perform an formula is:
string formula = "{formula from textarea}"
worksheet.EvaluateValue(formula)
and it's expect and string.
As I don't know what formula user will write, or how many parameters this formula has and what are the parameters data type, it's kind difficult to validate.
Now my question is?
How could I validate the expression?
I think in an alternative: Provide to user and page with textbox for each parameter in the expression. The user will be able to provide some data and validate the RESULT of formula. If the sintaxe of formula is wrong the application throw an exception.
It would be a good solution, but for each "PROCESS" that user will interact to, He'll write 10, 15 formulas, and maybe it would be little painful.
Anyone could provide me an Good solution for that?
Thank you!
https://sites.google.com/site/akshatsharma80/home/data-structures/validate-an-arithmetic-expression
refer this site for validation
This is a very late response but I have been working on expression evaluators in Excel with VBA for a while and I might shed some light. I have three solutions to try but all have limitations.
1) Ask the user to put a '$' after a variable name to signify a string (or some other unique character). Drawback is that it is not as simple as typing a single letter for a variable.
2) Assume all variables entered are double precision. Then change the variable to strings in all combinations until one combination works. Could be very time consuming to try all the combinations if the user enters lots of individual variables.
3) Assume all variables entered are double precision. But then have a list in your program of functions that require strings for parameters. Then you could parse the expression, lookup the functions in your list and then designate the parameters that require string input with a string signifier (like in step 1). This will not account for user defined functions.
Now to test out the function, replace all the numeric variables with '1' and all the string variables with "a", then EvaluateValue. If you get a result or an error signifying a calculation error, it is good.
BTW, in order to parse the expression, I suggest the following method. I do not know C#, only VB, so I will only talk in general terms.
1) Take your expression string and do a search and replace of all the typical operators with the same operator but with a backslash ("\") in front and behind the operator (you can use any other character that is not normally used in Excel formulas if you like). This will delineate these operators so that you can easily ignore them and split up your expression into chunks. Typically only need to delineate +,-,/,*,^,<,>,= and {comma}. So search for a "+" and replace it with a "\+\" and so on. For parenthesis, replace "(" and ")" with "(\\" and "\\)" respectively.
So your sample formula "SUM(A, SQRT(B, C)) * PI()" will look like this:
"SUM(\\A\,\ SQRT(\\B\,\ C\\)\\) \*\ PI(\\\\)"
You can also clean up the string a bit more by eliminating any spaces and by eliminating redundant backslashes by replacing every three consecutive backslashes with a single one (replace "\\" with "\").
2) In Visual Basic there is a command called 'Split' that can take a string like this and split it into a one dimensional array using a delimiter (in this case, the backslash). There must be an equivalent in C# or you can just make one. Your array will look like this: "SUM(", "", "A", ",", "SQRT(", "", "B", etc.
Now iterate through your array, starting at the first element and then skipping every other element. These elements will either be a number (a numeric test), a variable, a function (with have a "(" at the end of it), a parenthesis or blank.
Now you can do other checks as you need and replace the variables with actual values.
3) When you are done, rejoin the array back into a string, without any delimiters, and try the Evaluate function.
I have a console app that takes in string parameters. The app runs through the command line like so:
C:\ExampleApp.exe this is a "test"
In the above example, there are 4 different strings read in as parameters.. Is there any way to determine which parameter had quotes around it? When I do a Console.WriteLine(args[3]), it prints out as test and not "test".
Environment.CommandLine
returns a complete command line as a single string, just parse it and you will get the original parameters, quoted or not.
As far as I know the quotes are stripped by the framework before beeing passed to your main function, have you tried to escape the qoutes using a backslash?
My question may sound weird but that's the scenario i'm at.
I need to parse an Excel formula (getting it from Office.Interop.Excel) and get the parameters from the formula (# of parameter can vary)
There are multiple cases to consider.
E.g.:
1. myformula("param1", "param2")
2. myformula("param1", A2)
3. myformula("param1", , "param3")
4. myformula(A1, , "param3")
5. myformula("param1, has commas in it", "param2")
Is there a nicer way to parse this as opposed to having multiple if branches (especially considering when string array is mixed, i.e. some parameters have quotations and other parameters are reference parameters)?
Using string split(',') doesn't seem to be too helpful as I can have commas in the parameter itself.
I've also tried
string[] paramArray = new string[]{(parameters)}
where parameters = "\"param1\", \"param2\"";
but that didn't seem to work either (it won't work at all if I have an empty parameter but that's another case).
My outcome should be some sort of an array (or list or any other collection) that would contain all of the parameters, and if a parameter didn't have quotation marks in it then I would need to evaluate it.
Any help would be appreciated.
I would process the string looking for " or , if " found search fwd looking for the closing " ignoring any , along the way and taking into account the possibility of impeded "'s in the parameter. When you get the closing " resume looking for " or , and repeat.
Another option would be to use split but then check the results for elements beginning with " . Merge these with the next array element to for the complete parameter (may be that > 2 consecutive array element need to be merged) Also watch out for strings like "zzz"",""xxx" (a single string that = zzz","xxx)