Develop Reference

Remove preceeding CRLF if the current line starts with a SPACE

An example source I need to work with text file:
Analysis: this is a test that wraps
and this is the second line
this is the third line
Demonstration: This is an example of only one line
Result data more text
My expected output if all works:
LineID
Source
Description
1
Analysis: this is a test that wraps and this is the second line this is the third line
2
Demonstration: This is an example of only one line
3
Result data more text
This is my code that I want to add to the datagridview
string path = #"Sample1.txt";
dtSource.Columns.Add("LineID");
dtSource.Columns.Add("Source");
dtSource.Columns.Add("Description");
string[] readText = File.ReadAllLines(path);
int linenum = 0;
foreach (string s in readText)
{
string sourceline = s;
if(sourceline.StartsWith(" "))
{
sourceline = sourceline.Replace("\n", "").Replace("\r", ""); //STUCK
}
dtSource.Rows.Add(linenum, sourceline, "");
linenum++;
}
dataGridView1.DataSource = dtSource;
Now I can't clearly think. Was thinking to just use a List<string> then manipulate but didn't want to add more stuff. Also, thought about just modifying the text from the previous datatable row joining the two. Any linq queries or something that I can do to simplify this?

This should work
foreach (string s in readText)
{
string sourceline = s;
if (sourceline.StartsWith(" "))
{
dtSource.Rows[linenum - 1]["Source"] += sourceline;
}
else
{
dtSource.Rows.Add(linenum, sourceline, "");
linenum++;
}
}

You can use Aggregate
var result = readText.Aggregate(new List<string>(), (acc, x) =>
{
if (x.StartsWith(" "))
{
acc[acc.Count - 1] += x;
}
else
{
acc.Add(x);
}
return acc;
}).Select((s, i) => dtSource.Rows.Add(i + 1, s, string.Empty)).ToList();

Going to the end of a substring in c#

The comment // go to end, I can't figure out how to cleanly end the substring :(
Is there a simpler way to go to the end of the substring rather than mathing out the number by myself? For more complex strings this would be too hard
string word = Console.ReadLine();
string[] lines = File.ReadAllLines(file);
using (var far = File.CreateText(resultfile))
{
foreach (string line in lines)
{
StringBuilder NewL = new StringBuilder();
int ind = line.IndexOf(word);
if (ind >= 0)
{
if (ind == 0)
{
NewL.Append(line.Substring(ind+ word.Length +1, // go to end);
}else{
NewL.Append(line.Substring(0, ind - 1));
NewL.Append(line.Substring(ind + word.Length + 1, // go to end));}
far.WriteLine(NewL);
}
else
{
far.WriteLine(line);
}
}
I don't know what more details the stackoverflow wants, anyone who can answer this pretty sure can clearly understand this simple code anyways.

You can use the String.Substring(int) overload, which automatically continues to the end of the source string:
NewL.Append(line.Substring(ind + word.Length + 1));
Retrieves a substring from this instance. The substring starts at a specified character position and continues to the end of the string.

It seems to me that you are just trying to remove a certain word from the loaded lines. If this is your task then you can simply replace the word with an empty string
foreach (string line in lines)
{
string newLine = line.Replace(word, "");
far.WriteLine(newLine);
}
Or even without an explicit loop with a bit of Linq
var result = lines.Select(x = x.Replace(word,""));
File.WriteAllLines("yourFile.txt", result);
Or, given the requirement to match an additional character after the word you can solve it with Regex.
Regex r = new Regex(word + ".");
var result = lines.Select(x => r.Replace(x, ""));
File.WriteAllLines("yourFile.txt", result);

Replacing word in different ways

For first I have phrase like ice z comp. In the output I need List<string> which have this word with dashes for example like this: ice-z comp, ice z-comp, ice-z-comp
For now I have this:
var synonymFromSynonym = new List<string>();
var countOfSpaces = word.Count(Char.IsWhiteSpace);
for (int x = 0; x < countOfSpaces; x++)
{
// What here for my output ?
}

The problem can be solved using the following implementation. First, the input is split into the individual words.
var Words = word.Split(new char[] { ';' }, StringSplitOptions.RemoveEmptyEntries).ToArray();
Then, the words are assembled again, considering two cases, namely whether the connection is done with a space or with a hyphen. This can be done recursively as follows, where a call like GenerateResult("", 0 ) would start the calculation.
List<string> Result = new List<string>();
void GenerateResult(string Intermediate, int Position)
{
if (Position == Words.Count() - 1) // base case, nothing to append
{
Result.Add(Intermadiate);
}
else
{
GenerateResult( Intermediate + " ", Position + 1 ); // space case
GenerateResult( Intermediate + "-", Position + 1 ); // hyphen case
}
}

Alternatively upper- and lowercase words in a string

I use Visual Studio 2010 ver.
I have array strings [] = { "eat and go"};
I display it with foreach
I wanna convert strings like this : EAT and GO
Here my code:
Console.Write( myString.First().ToString().ToUpper() + String.Join("",myString].Skip(1)).ToLower()+ "\n");
But the output is : Eat and go . :D lol
Could you help me? I would appreciate it. Thanks

While .ToUpper() will convert a string to its upper case equivalent, calling .First() on a string object actually returns the first element of the string (since it's effectively a char[] under the hood). First() is actually exposed as a LINQ extension method and works on any collection type.
As with many string handling functions, there are a number of ways to handle it, and this is my approach. Obviously you'll need to validate value to ensure it's being given a long enough string.
using System.Text;
public string CapitalizeFirstAndLast(string value)
{
string[] words = value.Split(' '); // break into individual words
StringBuilder result = new StringBuilder();
// Add the first word capitalized
result.Append(words[0].ToUpper());
// Add everything else
for (int i = 1; i < words.Length - 1; i++)
result.Append(words[i]);
// Add the last word capitalized
result.Append(words[words.Length - 1].ToUpper());
return result.ToString();
}

If it's always gonna be a 3 words string, the you can simply do it like this:
string[] mystring = {"eat and go", "fast and slow"};
foreach (var s in mystring)
{
string[] toUpperLower = s.Split(' ');
Console.Write(toUpperLower.First().ToUpper() + " " + toUpperLower[1].ToLower() +" " + toUpperLower.Last().ToUpper());
}

If you want to continuously alternate, you can do the following:
private static string alternateCase( string phrase )
{
String[] words = phrase.split(" ");
StringBuilder builder = new StringBuilder();
//create a flag that keeps track of the case change
book upperToggle = true;
//loops through the words
for(into i = 0; i < words.length; i++)
{
if(upperToggle)
//converts to upper if flag is true
words[i] = words[i].ToUpper();
else
//converts to lower if flag is false
words[i] = words[i].ToLower();
upperToggle = !upperToggle;
//adds the words to the string builder
builder.append(words[i]);
}
//returns the new string
return builder.ToString();
}

Quickie using ScriptCS:
scriptcs (ctrl-c to exit)
> var input = "Eat and go";
> var words = input.Split(' ');
> var result = string.Join(" ", words.Select((s, i) => i % 2 == 0 ? s.ToUpperInvariant() : s.ToLowerInvariant()));
> result
"EAT and GO"

SubString editing

I've tried a few different methods and none of them work correctly so I'm just looking for someone to straight out show me how to do it . I want my application to read in a file based on an OpenFileDialog.
When the file is read in I want to go through it and and run this function which uses Linq to insert the data into my DB.
objSqlCommands.sqlCommandInsertorUpdate
However I want to go through the string , counting the number of ","'s found . when the number reaches four I want to only take the characters encountered until the next "," and do this until the end of the file .. can someone show me how to do this ?
Based on the answers given here my code now looks like this
string fileText = File.ReadAllText(ofd.FileName).Replace(Environment.NewLine, ",");
int counter = 0;
int idx = 0;
List<string> foo = new List<string>();
foreach (char c in fileText.ToArray())
{
idx++;
if (c == ',')
{
counter++;
}
if (counter == 4)
{
string x = fileText.Substring(idx);
foo.Add(fileText.Substring(idx, x.IndexOf(',')));
counter = 0;
}
}
foreach (string s in foo)
{
objSqlCommands.sqlCommandInsertorUpdate("INSERT", s);//laClient[0]);
}
However I am getting an "length cannot be less than 0" error on the foo.add function call , any ideas ?

A Somewhat hacky example. You would pass this the entire text from your file as a single string.
string str = "1,2,3,4,i am some text,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20";
int counter = 0;
int idx = 0;
List<string> foo = new List<string>();
foreach (char c in str.ToArray())
{
idx++;
if (c == ',')
{
counter++;
}
if (counter == 4)
{
string x = str.Substring(idx);
foo.Add(str.Substring(idx, x.IndexOf(',')));
counter = 0;
}
}
foreach(string s in foo)
{
Console.WriteLine(s);
}
Console.Read();
Prints:
i am some text
9
13
17

As Raidri indicates in his answer, String.Split is definitely your friend. To catch every fifth word, you could try something like this (not tested):
string fileText = File.ReadAllText(OpenDialog.FileName).Replace(Environment.NewLine, ",");
string words[] = fileText.Split(',');
List<string> everFifthWord = new List<string>();
for (int i = 4; i <= words.Length - 1, i + 5)
{
everyFifthWord.Add(words[i]);
}
The above code reads the selected file from the OpenFileDialog, then replaces every newline with a ",". Then it splits the string on ",", and starting with the fifth word takes every fifth word in the string and adds it to the list.

File.ReadAllText reads a text file to a string and Split turns that string into an array seperated at the commas:
File.ReadAllText(OpenDialog.FileName).Split(',')[4]
If you have more than one line use:
File.ReadAllLines(OpenDialog.FileName).Select(l => l.Split(',')[4])
This gives an IEnumerable<string> where each string contains the wanted part from one line of the file

It's not clear to me if you're after every fifth piece of text between the commas or if there are multiple lines and you want only the fifth piece of text on each line. So I've done both.
Every fifth piece of text:
var text = "1,2,3,4,i am some text,6,7,8,9"
+ ",10,11,12,13,14,15,16,17,18,19,20";
var everyFifth =
text
.Split(',')
.Where((x, n) => n % 5 == 4);
Only the fifth piece of text on each line:
var lines = new []
{
"1,2,3,4,i am some text,6,7",
"8,9,10,11,12,13,14,15",
"16,17,18,19,20",
};
var fifthOnEachLine =
lines
.Select(x => x.Split(',')[4]);