Question

Help with C# string literal

Asked by: thefritterfatboy

Can anybody give me a quick run down of what this does;


header[header.Count - 1] += oneLine.TrimStart(new char[] {' ' /* dangerous ! */, '\t'});

I'm trying to convert an implementation of domainKeys to vb.net and I have no idea what is going on here. I get that on eof the param array is a tab - but what is going on before that?

It's only the TrimStart call I don't understand. What is going on?

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Asked On
2006-11-06 at 07:23:59ID22050376
Tags

string

,

literal

,

trimstart

Topic

C# Programming Language

Participating Experts
3
Points
200
Comments
5

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Answers

 

by: ozymandiasPosted on 2006-11-06 at 07:31:00ID: 17881545

The string stored in the last position in the array called header is having another string (oneLine) appended to it but only after any leading spaces or tabs have been trimmed off it.

TrimStart() will remove whitespace characters from the start of a string.
TrimStart(char[]) will remove any characters in the char[].

 

by: ozymandiasPosted on 2006-11-06 at 07:32:13ID: 17881553

for some reason someone has decided that trimming leading spaces is dangerous and had addeed a comment to that effect.

 

by: AlexFMPosted on 2006-11-06 at 07:34:59ID: 17881574

TrimStart(new char[] {' ', '\t'});

Result is string instance without leading spaces and tabs in original string. This means, if oneLine string contains any number of spaces and tabs in any order in the beginning, they are removed from result. BTW, I don't see anything dangerous here. For example , if oneLine is "   abc", this is executed as:

header[header.Count - 1] += "abc";

 

by: joechinaPosted on 2006-11-06 at 07:41:44ID: 17881625

Difference between
TrimStart(new char[] {' ', '\t'});
and
Trim();

is

Trim will remove new line and return as well

Try

string s = @"



aaa";

Console.WriteLine(s.Trim());

Console.WriteLine(s.TrimStart(new char[] {' ', '\t'}));

You will see the difference.

 

by: thefritterfatboyPosted on 2006-11-06 at 08:52:29ID: 17882305

It was the comment that had me there. I wasn't aware C# allowed for inline comments.

... I suspect the "danger" is to do with how the string is used in the encryption further down the script.

20120131-EE-VQP-002

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