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c# how to get one value from substring

How to solve this?
What i want to change this :
C:\files\team\business\dev\Source\systems\extension\destination\1.0.1.1\
to new value:
value = "1.0.11";

You could just get the Name of the corresponding DirectoryInfo:
string path = #"C:\files\team\business\dev\Source\systems\extension\destination\1.0.1.1\";
string version = new DirectoryInfo(path).Name;

Alternative method:
var path = #"C:\files\team\business\dev\Source\systems\extension\destination\1.0.1.1\";
var value = Path.GetFileName(path.TrimEnd(new[]{'/','\\'}));
// OUTPUT: 1.0.1.1
This basically removes any last directory delimeters and then treats the last directory as a filename, so it returns the last directory.
Based on #JeppeStigNielsen's comments below, here's a better, platform independent alternative.
var value = Path.GetFileName(Path.GetDirectoryName(path));
This will work if there is a file name present as well.
var value = Path.GetFileName(Path.GetDirectoryName(".../1.0.1.1/somefile.etc"));
// returns 1.0.1.1

Darin's answer is great but as an alternative;
string s = #"C:\files\team\business\dev\Source\systems\extension\destination\1.0.1.1\";
string[] array = s.Split('\\');
Console.WriteLine(array[array.Length - 2]);
Output will be;
1.0.1.1
Here a DEMO.

VisitClassDeclaration node.Identifier in Roslyn

How can I find what line number in the source file the declaration was found on?

Disclaimer: I work for Microsoft on the Roslyn team.
You can use the ISyntaxTree.GetLineSpan() method to convert to a line number. For example, given an ISymbol "symbol", you can get the start location of the first definition with:
var loc = symbol.Locations.First();
var lineSpan = loc.SourceTree.GetLineSpan(loc.SourceSpan,
usePreprocessorDirectives: false);
var line = lineSpan.StartLinePosition.Line;
var character = lineSpan.StartLinePosition.Character;
From the title, it looks like you're starting with a SyntaxNode, so you can just use the Span property directly.

How to use google-diff-match-patch C# library?

I am looking at http://code.google.com/p/google-diff-match-patch/ and have downloaded the file. When I look at it is 2 files
DiffMatchPatch.cs
DiffMatchPatchTest.cs
When I try to make a new object of DiffMatchPatch.cs I have to pass in some operation and string text.
http://neil.fraser.name/software/diff_match_patch/svn/trunk/demos/demo_diff.html
In the demo they cross out the words that are different and that is what I am trying to achieve.
I am trying to compare 2 blocks of text on the server side finds the differences and send a email to the user with the file block of text to them like the end result is in the demo that I posted above.
So does anyone have a tutorial on how to use the C# version?

For reference, this is really easy:
var dmp = new diff_match_patch();
var diffs = dmp.diff_main(text1, text2);
var html = dmp.diff_prettyHtml(diffs);

Implementation with current version(2.1.0) would look like this
var dmp = DiffMatchPatchModule.Default;
var diffs = dmp.DiffMain(text1, text2);
var html = dmp.DiffPrettyHtml(diffs);

For anyone who came across this thread because of the title and expected an explanation on how to use the Google Diff-Match-Patch algorithm via the https://github.com/pocketberserker/Diff.Match.Patch library found on NuGet, to create a diff string, so he can send the change somewhere (e.g. via websocket) and restore it at the destination based on the old value and the diff string, that would work like this:
var oldValue = "Test old text.";
var newValue = "Test new text.";
// create diff string
var dmp = DiffMatchPatch.DiffMatchPatchModule.Default;
var diffs = dmp.DiffMain(oldValue, newValue);
var srcDelta = dmp.DiffToDelta(diffs);
// restore from diff
var dmp = DiffMatchPatch.DiffMatchPatchModule.Default;
var dstDelta = dmp.DiffFromDelta(oldValue, srcDelta);
var restoredNewValue = dmp.DiffText2(dstDelta);

different format into one single line Interop.word

I've been trying to figure out how to insert 2 different formats into the same paragraph using interop.word in c# like this:
hello planet earth here's what I want to do

Assuming you have your document defined as oDoc, the following code should get you the desired result:
Word.Paragraph oPara = oDoc.Content.Paragraphs.Add(ref oMissing);
oPara.Range.Text = "hello planet earth here's what I want to do";
object oStart = oPara.Range.Start + 13;
object oEnd = oPara.Range.Start + 18;
Word.Range rBold = oDoc.Range(ref oStart, ref oEnd);
rBold.Bold = 1;

I had to modify Dennis' answer a little to get it to work for me.
What I'm doing it totally automated, so I have to only work with variables.
private void InsertMultiFormatParagraph(string text, int size, int spaceAfter = 10) {
var para = docWord.Content.Paragraphs.Add(ref objMissing);
para.Range.Text = text;
// Explicitly set this to "not bold"
para.Range.Font.Bold = 0;
para.Range.Font.Size = size;
para.Format.SpaceAfter = spaceAfter;
var start = para.Range.Start;
var end = para.Range.Start + text.IndexOf(":");
var rngBold = docWord.Range(ref objStart, ref objEnd);
rngBold.Bold = 1;
para.Range.InsertParagraphAfter();
}
The main difference that made me want to make this post was that the Paragraph should be inserted AFTER the font is changed. My initial thought was to insert it after setting the SpaceAfter property, but then the objStart and objEnd values were tossing "OutOfRange" Exceptions. It was a little counter-intuitive, so I wanted to make sure everyone knew.

The following code seemed to work the best for me when formatting a particular selection within a paragraph. Using Word's built in "find" function to make a selection, then formatting only the selected text. This approach would only work well if the text to select is a unique string within the selection. But for most situations I have run across, this seems to work.
oWord.Selection.Find.Text = Variable_Containing_Text_to_Select; // sets the variable for find and select
oWord.Selection.Find.Execute(); // Executes find and select
oWord.Selection.Font.Bold = 1; // Modifies selection
oWord.Selection.Collapse(); // Clears selection
Hope this helps someone!

I know this post is old, but it came out in almost all my searches. The answer below is in case someone, like me, wants to do this for more than one word in a sentence. In this case, I loop through a string array of variables that contain strings and change that text to bold--modifing #joshman1019
string[] makeBold = new string[4] {a, b, c, d};
foreach (string s in makeBold)
{
wApp.Selection.Find.Text = s; //changes with each iteration
wApp.Selection.Find.Execute();
wApp.Selection.Font.Bold = 1;
wApp.Selection.Collapse(); //used to 'clear' the selection
wApp.Selection.Find.ClearFormatting();
}
So, each string represented by the variable will be bold. So if a = "hello world", then Hello World is made bold in the Word doc. Hope it saves someone some time.

I know this is an old thread, but I thought I'd post here anyway for those that come across it via Google (like I did). I got most of the way to a solution with krillgar's approach, but I had trouble because some of my text contains newlines. Accordingly, this modification worked best for me:
private void WriteText(string text)
{
var para = doc.Content.Paragraphs.Add();
var start = para.Range.Start;
var end = para.Range.Start + text.IndexOf(":");
para.Range.Text = text;
para.Range.Font.Bold = 0;
para.Range.InsertParagraphAfter();
if(text.Contains(":")){
var rngBold = doc.Range(start, end);
rngBold.Bold = 1;
}
}
The key difference is that I calculate start and end earlier in the function. I can't quite put my finger on it, but I think if your new text has newlines in it, the later calculation of start/end messes something up.
And obviously my solution is intended for text with the format:
Label: Data
where Label is to be bolded.

Consider usage of Range.Collapse eventually with Microsoft.Office.Interop.Word.WdCollapseDirection.wdCollapseEnd as parameter.
That would allow next text to have formatting different than previous text (and next text formatting will not affect formatting of previous one).

Find/parse server-side <?abc?>-like tags in html document

I guess I need some regex help. I want to find all tags like <?abc?> so that I can replace it with whatever the results are for the code ran inside. I just need help regexing the tag/code string, not parsing the code inside :p.
<b><?abc print 'test' ?></b> would result in <b>test</b>
Edit: Not specifically but in general, matching (<?[chars] (code group) ?>)

This will build up a new copy of the string source, replacing <?abc code?> with the result of process(code)
Regex abcTagRegex = new Regex(#"\<\?abc(?<code>.*?)\?>");
StringBuilder newSource = new StringBuilder();
int curPos = 0;
foreach (Match abcTagMatch in abcTagRegex.Matches(source)) {
string code = abcTagMatch.Groups["code"].Value;
string result = process(code);
newSource.Append(source.Substring(curPos, abcTagMatch.Index));
newSource.Append(result);
curPos = abcTagMatch.Index + abcTagMatch.Length;
}
newSource.Append(source.Substring(curPos));
source = newSource.ToString();
N.B. I've not been able to test this code, so some of the functions may be slightly the wrong name, or there may be some off-by-one errors.

var new Regex(#"<\?(\w+) (\w+) (.+?)\?>")
This will take this source
<b><?abc print 'test' ?></b>
and break it up like this:
Value: <?abc print 'test' ?>
SubMatch: abc
SubMatch: print
SubMatch: 'test'
These can then be sent to a method that can handle it differently depending on what the parts are.
If you need more advanced syntax handling you need to go beyond regex I believe.
I designed a template engine using Antlr but thats way more complex ;)

exp = new Regex(#"<\?abc print'(.+)' \?>");
str = exp.Replace(str, "$1")
Something like this should do the trick. Change the regexes how you see fit