How to read a portion of a text file line from left using C#

Hi,

I would like to reference a text file and read a small portion of all of the lines in the document to check whether it is equal to a string i am looking for. The string will always be in the first 4 characters of a line which is which I want to use a command similar to "left" in excel/VBA.

All of the syntaxes I have found online do not work in GH. GH doesn't know what to do with the term "left" - (1. Error (CS0103): The name 'Left' does not exist in the current context (line 75)). Does anyone know a syntax for this that GH will accept?

Furthermore, can someone explain why these syntax mismatches happen? surely c# is the same no matter where you are using it?

Thanks a bunch!

ken

Replies to This Discussion

Permalink Reply by peter fotiadis on May 6, 2016 at 12:40am

http://stackoverflow.com/questions/15941985/how-to-get-the-first-fi...

https://msdn.microsoft.com/en-us/library/9yyz8a6c%28v=vs.110%29.aspx

http://www.dotnetperls.com/substring

Permalink Reply by Kenneth Allan on May 6, 2016 at 3:43am

PROBLEM SOLVED:

Perfect!

string str = yourStringVariable.Substring(0,5); works great for my purpose.

No chance you can explain why this command works in the gh component but others i have found online do not? Is there different types of C# or dlls that gh is referencing that something like Microsoft Visual Studio would be referencing differently?

Thanks so much!

Ken

Permalink Reply by peter fotiadis on May 6, 2016 at 4:48am

By "command" you mean string class Method(s)?

https://msdn.microsoft.com/en-us/library/system.string%28v=vs.110%2...

... others i have found online do not ...

List some "other" Methods.

... different types ...

you mean .NET versions? (supporting C# "builds": 4,5,...)

Permalink Reply by Kenneth Allan on May 6, 2016 at 5:25am

others:

http://snipplr.com/view/2500/

string line = "this is a string";

console.writeline(left(line,5)); doesnt work. even as just left(line,5);

error: 1. Error (CS0103): The name 'Left' does not exist in the current context (line 75)

different types:

yes, i assume...I am unfamiliar with coding and terminology. Rhino uses .Net right? what is the alternative to .Net? does visual studio also use .Net? Why would anyone choose to use .Net over an alternative. If there is an article that explains this please just link it to me.

Thanks for your help, I know its a big ask.

Ken

Permalink Reply by peter fotiadis on May 6, 2016 at 7:44am

Strings et all: You forgot the class that owns the Method:

string Massacre= LeftRightMid.Left(myString, 4);

see attached

A bit amusing (kinda) explanations upon what .NET is ... hmm... later (for the no funny aspect: Google it).

Attachments: