Split String with multiple delimiters to different arrays in c# - c#

So I have a text file copied into memory that is delimited as follows:
"425,9856\n852,9658\n"
This is a long string with some 30,000 entries in total. What I want to do is create two arrays, one for the value to the left of the comma, one for the value to the right of the comma, and then to each array respectively i want to append the next two comma delimited strings that come after the "\n".
I have tried splitting using .Split and passing two delimiting values, but it obviously just creates one array with all values sequentially. Such as:
425
9856
852
9658
When what I want is:
array1:
452
852
array2:
9856
9658
Does that make sense?
many thanks


Since you're reading from a file, why not stream the input line-by-line, rather than reading the whole lot into memory in one go?
using var reader = new StreamReader(filePath);
while (reader.ReadLine() is not null line)
{
// Each line is of the form '425,9856', so just split on the comma
var parts = line.Split(',');
firstList.Add(parts[0]);
secondList.Add(parts[1]);
}


You can just split it twice to get what you want
public static void Main()
{
var foo = "425,9856" + Environment.NewLine + "852,9658" + Environment.NewLine;
var array1 = new List<string>();
var array2 = new List<string>();
string[] lines = foo.Split(
new string[] { Environment.NewLine },
StringSplitOptions.None);
foreach(var line in lines)
{
//Console.WriteLine("line: " + line);
var lineSplit = line.Split(',');
//Console.WriteLine("lineSplit: " + lineSplit.Length);
//lineSplit.Dump();
if(lineSplit.Length > 1)
{
array1.Add(lineSplit[0]);
array2.Add(lineSplit[1]);
}
}
Console.WriteLine("Array1: ");
array1.Dump();
Console.WriteLine("Array2: ");
array2.Dump();
}
And here's a working fiddle of it.


You can use RegEx
string row = #"425,9856\n852,9658\n";
string left = #"[^|(?<=n)]\d*(?=,)";
string right = #"(?<=,)\d*(?=\\)";
Regex rgLeft = new Regex(left);
var l = rgLeft.Matches(row).Select(p=> p.Value);
Regex rgRight = new Regex(right);
var r = rgRight.Matches(row).Select(p=> p.Value);

Related

Removing a parent Node from a flattened json response

I have a flattened json response like this :
"data.Applicant.Age", "0"
"data.Applicant.IsInsured", "True"
i want to be able to remove data from the flattened collection using C#.
My Expected result should look like this :
"Applicant.Age","0"
"Applicant.IsInsured","True"

var input = #"""Applicant.Age"",""0""
""Applicant.IsInsured"",""True"""; // this is a string containing Environment.Newline
var lines = input.Split(new string[] { Environment.NewLine }, StringSplitOptions.RemoveEmptyEntries);
var newLines = new List<string>();
string output;
foreach (var line in lines)
{
var key = line.Split(',')[0].Trim();
var value = line.Split(',')[1].Trim();
key = key.Substring(6);
var newLine = string.Join(":", key, value);
newLines.Add(newLine);
Console.WriteLine(newLine);
}
This code converts your input, which is a string containing two lines, to output, which is a string containing two lines and each line does not have the data. part.

I want to split the data in the list when i see the ; in C#

I need to split this data in the box to and add it to new line when it see the ";"
var retryParamInfo = new ExParamsContent
{
Idenitifier = tempIdentifier.SerialNumber,
Name = String.Format( "Retry Information Console {0}",i),
Value = MyTestRunGlobals.FixtureComponents[i].Uuts[0].RetryList,
//Value = thisUut.RetryList.Replace("\n", "\n" + Environment.NewLine),
};
uutTempInfo.ExParams.Add(retryParamInfo);

To split a string when some character occours, you can use:
myString.split(';');
and make the result of this be inside a array.

Copying CSV file while reordering/adding empty columns

Copying CSV file while reordering/adding empty columns.
For example if ever line of incoming file has values for 3 out of 10 columns in order different from output like (except first which is header with column names):
col2,col6,col4 // first line - column names
2, 5, 8 // subsequent lines - values for 3 columns
and output expected to have
col0,col1,col2,col3,col4,col5,col6,col7,col8,col9
then output should be "" for col0,col1,col3,col5,col7,col8,col9,and values from col2,col4,col4 in the input file. So for the shown second line (2,5,8) expected output is ",,2,,5,,8,,,,,"
Below code I've tried and it is slower than I want.
I have two lists.
The first list filecolumnnames is created by splitting a delimited string (line) and this list gets recreated for every line in the file.
The second list list has the order in which the first list needs to be rearranged and re concatenated.
This works
string fileName = "F:\\temp.csv";
//file data has first row col3,col2,col1,col0;
//second row: 4,3,2,1
//so on
string fileName_recreated = "F:\\temp_1.csv";
int count = 0;
const Int32 BufferSize = 1028;
using (var fileStream = File.OpenRead(fileName))
using (var streamReader = new StreamReader(fileStream, Encoding.UTF8, true, BufferSize))
{
String line;
List<int> list = new List<int>();
string orderedcolumns = "\"\"";
string tableheader = "col0,col1,col2,col3,col4,col5,col6,col7,col8,col9,col10";
List<string> tablecolumnnames = new List<string>();
List<string> filecolumnnames = new List<string>();
while ((line = streamReader.ReadLine()) != null)
{
count = count + 1;
StringBuilder sb = new StringBuilder("");
tablecolumnnames = tableheader.Split(',').ToList();
if (count == 1)
{
string fileheader = line;
//fileheader=""col2,col1,col0"
filecolumnnames = fileheader.Split(',').ToList();
foreach (string col in tablecolumnnames)
{
int index = filecolumnnames.IndexOf(col);
if (index == -1)
{
sb.Append(",");
// orderedcolumns=orderedcolumns+"+\",\"";
list.Add(-1);
}
else
{
sb.Append(filecolumnnames[index] + ",");
//orderedcolumns = orderedcolumns+ "+filecolumnnames["+index+"]" + "+\",\"";
list.Add(index);
}
// MessageBox.Show(orderedcolumns);
}
}
else
{
filecolumnnames = line.Split(',').ToList();
foreach (int items in list)
{
//MessageBox.Show(items.ToString());
if (items == -1)
{
sb.Append(",");
}
else
{
sb.Append(filecolumnnames[items] + ",");
}
}
//expected format sb.Append(filecolumnnames[3] + "," + filecolumnnames[2] + "," + filecolumnnames[2] + ",");
//sb.Append(orderedcolumns);
var result = String.Join (", ", list.Select(index => filecolumnnames[index]));
}
using (FileStream fs = new FileStream(fileName_recreated, FileMode.Append, FileAccess.Write))
using (StreamWriter sw = new StreamWriter(fs))
{
sw.WriteLine(sb.ToString());
}
}
I am trying to make it faster by constructing a string orderedcolumns and remove the second for each loop which happens for every row and replace it with constructed string.
so if you uncomment the orderedcolumns string construction orderedcolumns = orderedcolumns+ "+filecolumnnames["+index+"]" + "+\",\""; and uncomment the append sb.Append(orderedcolumns); I am expecting the value inside the constructed string but when I append the orderedcolumns it is appending the text i.e.
""+","+filecolumnnames[3]+","+filecolumnnames[2]+","+filecolumnnames[1]+","+filecolumnnames[0]+","+","+","+","+","+","+","
i.e. I instead want it to take the value inside the filecolumnnames[3] list and not the filecolumnnames[3] name itself.
Expected value: if that line has 1,2,3,4
I want the output to be 4,3,2,1 as filecolumnnames[3] will have 4, filecolumnnames[2] will have 3..

String.Join is the way to construct comma/space delimited strings from sequence.
var result = String.Join (", ", list.Select(index => filecolumnnames[index]);
Since you are reading only subset of columns and orders in input and output don't match I'd use dictionary to hold each row of input.
var row = tablecolumnnames
.Zip(line.Split(','), (Name,Value)=> new {Name,Value})
.ToDictionary(x => x.Name, x.Value);
For output I'd fill sequence from defaults or input row:
var outputLine = String.Join(",",
filecolumnnames
.Select(name => row.ContainsKey(name) ? row[name] : ""));
Note code is typed in and not compiled.

orderedcolumns = orderedcolumns+ "+filecolumnnames["+index+"]" + "+\",\""; "
should be
orderedcolumns = orderedcolumns+ filecolumnnames[index] + ",";
you should however use join as others have pointed out. Or
orderedcolumns.AppendFormat("{0},", filecolumnnames[index]);
you will have to deal with the extra ',' on the end

Getting Data From IEnumerable

I have text file which contains airport Codes in this format:
"AAA","","Anaa Arpt","PF","","","AAA","2","N","272"
I used a StreamReader to to read the line from file and then I add that line to string list finally I convert that list to IEnumerable type.
Can you please help me how could I get only three values from each line for example
AAA is airportCode
Anna Arpt airport name
PF is country Code
I want to get only these three values from each row.
Please find below the code.
using (StreamReader sr = new StreamReader("C:/AirCodes/RAPT.TXT"))
{
String line;
while ((line = sr.ReadLine()) != null)
{
aircodesFromTravelPort.Add(line);
Console.WriteLine(line);
}
}
var codes = (IEnumerable<String>)aircodesFromTravelPort;
foreach (var aircode in codes)

It seems that you can try using Linq, something like that:
var codes = File
.ReadLines(#"C:/AirCodes/RAPT.TXT")
.Select(line => line.Split(','))
.Select(items => new {
// I've created a simple anonymous class,
// you'd probably want to create you own one
Code = items[0].Trim('"'), //TODO: Check numbers
Airport = items[2].Trim('"'),
Country = items[3].Trim('"')
})
.ToList();
...
foreach(var item in codes)
Console.WriteLine(item);

You'll probably want to make use of String's Split function on each line to get the values into an array.
while ((line = sr.ReadLine()) != null)
{
var values = line.Split(","); // here you have an array of strings containing the values between commas
var airportCode = values[0];
var airportName = values[2];
var airportCountry = values[3];
var airportInfo = airportCode + "," + airportName + "," + airportCountry;
aircodesFromTravelPort.Add(airportInfo );
// what you actually do with the values is up to you, I just tried to make it as close to the original as possible.
Console.WriteLine(airportInfo);
}
Hope this helps!

I like Regex with named groups:
var line = #"""AAA"","""",""Anaa Arpt"",""PF"","""","""",""AAA"",""2"",""N"",""272""";
var pattern = #"^""(?<airportCode>\w+)"",""(\w*)"",""(?<ariportName>[\w\s]+)"",""(?<cuntryCode>\w+)""";
Match match = Regex.Match(line, pattern, RegexOptions.IgnoreCase);
if (match.Success)
{
string airportCode = match.Groups["airportCode"].Value;
string ariportName = match.Groups["ariportName"].Value;
string cuntryCode = match.Groups["cuntryCode"].Value;
}

How to append several lines when iterating through List?

I'd appreciate if someone could advise on the following.
I read the file containing the below text and writing each line into the List<string>:
CODE/1
NAME/some_name1
SHORT_NAME/short_name1
CODE/2
NAME/document is a piece of paper
containing information often
used as proof of something
SHORT_NAME/document is a piece
Now I'm parsing the list to get CODE, NAME and SHORT_NAME separately.
The problem is that some lines containing NAME have one sencence which is broken into several lines due to its long length. I want to append these lines into one sentence, the output should be:
...
NAME/document is a piece of paper containing information often used as proof of something
...
My code appends only one next line:
List<string> lines = File.ReadLines(path).ToList();
List<string> full_lines = new List<string>();
foreach (string line in lines)
{
if (line.StartsWith("NAME"))
{
name_index = lines.IndexOf(line);
string new_line = "";
if (!lines.ElementAt(name_index + 1).StartsWith("SHORT_NAME")) //checking if
//the next line does not start with SHORT_NAME (then it is continuation of NAME)
{
new_line = line + " " + lines.ElementAt(name_index + 1);//appending the next
//line
full_lines.Add(new_line); //adding into new list
}
else
{
full_lines.Add(line);
}
}
}
So the output is:
...
NAME/document is a piece of paper
...
So, how can I append all lines?
Thank you

When you're reading the file, read each line separately, instead of all them together. Then don't create a new line unless it starts with a key word or if the '/' is unique unless the line contains a '/'. Something like this might help:
List<string> full_lines = new List<string>();
System.IO.StreamReader sr = new System.IO.StreamReader(path);
string line = "";
while(!sr.EndOfStream)
{
line = sr.ReadLine();
if(!line.Contains("/"))
{
full_lines[full_lines.Count - 1] += line;
}
else
full_lines.Add(line);
}

change
if (!lines.ElementAt(name_index + 1).StartsWith("SHORT_NAME")) //checking if
//the next line does not start with SHORT_NAME (then it is continuation of NAME)
{
new_line = line + " " + lines.ElementAt(name_index + 1);//appending the next
//line
full_lines.Add(new_line); //adding into new list
}
else
{
full_lines.Add(line);
}
to
new_line = line;
name_index++;
while (!lines.ElementAt(name_index).StartsWith("SHORT_NAME"))
{
new_line = new_line + " " + lines.ElementAt(name_index);//appending the next line
name_index++;
}
full_lines.Add(new_line);

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