how can we read all lines from notepad comma separated and updated specific column conditionally, its successfully iterating no error is coming but not to update the value in C#
string[] existingLines = File.ReadAllLines(filepath);
foreach (var row in existingLines)
{
row.Split(Text_Separator)[0] = "Test Data";
}
var newdata = existingLines;
You'll need to use a for loop to modify an item while iterating over it. I believe you'll get an error if using foreach. This is because you are exposing an enumerator which is read-only.
This will iterate through each row, modify a column and replace the current row.
string[] existingLines = File.ReadAllLines(filepath);
foreach (var i = 0; i < existingLines.Length; i++)
{
// retrieve row by index
var row = existingLines[i];
// split into array of columns
var columns = row.Split(Text_Separator);
// update column
columns[0] = "Test Data";
// create row from array of columns
var updatedRow = string.Join(Text_Separator, columns);
// update row in array of rows
existingLines[i] = updatedRow;
}
var newdata = existingLines;
String.Split method will create a new instance of string array which is not referred to the existingLines variable. Hence, updating the value returned from Split does not reflect on existingLines
String[] stringArray = splitStrings;
if( arrIndex!= maxItems) {
stringArray = new String[arrIndex];
for( int j = 0; j < arrIndex; j++) {
stringArray[j] = splitStrings[j];
}
}
return stringArray;
https://github.com/Microsoft/referencesource/blob/master/mscorlib/system/string.cs
So, I was trying to present a csv document in a console application. However, due to the varying text size in it, the output was not in a presentable format.
To present it, I tried to count the maximum length of text for each column and then append white space to the remaining text in that column so that there's equal length of characters in each column.
I tried to get the character count, but can't seem to figure out how to proceed further.
var file = File.ReadAllLines(#"E:\File.csv");
var lineList = file.Select(x => x.Split(',').ToList()).ToList();
int maxColumn = lineList.Select(x => x.Count).Max(x => x);
List<int> maxElementSize = new List<int>();
for (int i = 0; i < maxColumn; i++)
{
//Some Logic
}
Any help would be highly appreciated.
Here's a sample console application to get maximum character length for each column :
static void Main(string[] args)
{
string CSVPath = #"D:\test.csv";
string outputText = "";
using (var reader = File.OpenText(CSVPath))
{
outputText = reader.ReadToEnd();
}
var colSplitter = ',';
var rowSplitter = new char[] { '\n' };
var rows = (from row in outputText.Split(rowSplitter, StringSplitOptions.RemoveEmptyEntries)
let cols = row.Split(colSplitter)
from col in cols
select new { totalCols = cols.Count(), cols = cols }).ToList();
int[] maxColLengths = new int[rows.Max(o => o.totalCols)];
for (int i = 0; i < rows.Count; i++)
{
for (int j = 0; j < rows[i].cols.Count(); j++)
{
int curLength = rows[i].cols[j].Trim().Length;
if (curLength > maxColLengths[j])
maxColLengths[j] = curLength;
}
}
Console.WriteLine(string.Join(", ", maxColLengths));
}
Hope this helped.
Try with a nested for loop:
var inputLines = File.ReadAllLines(#"E:\File.csv");
Dictionary<int,int> dictIndexLenght = new Dictionary<int,int>();
foreach(var line in inputLines)
{
List<string> columList = line.Split(',').ToList();
for (int i = 0; i < columList.Count; i++)
{
int tempVal = 0;
if(dictIndexLenght.TryGetValue(i,out tempVal))
{
if(tempVal<columList[i].Length)
{
dictIndexLenght[i]=columList[i].Length;
}
}
else
dictIndexLenght[i]=columList[i].Length;
}
}
Can check the result here or with this lines of code:
for(int i=0;i<dictIndexLenght.Count;i++)
{
Console.WriteLine("Column {0} : {1}", i, dictIndexLenght[i]);
}
Here's how I would do it, very similar to un-lucky's answer, only using a List<int> instead of a Dictionary<int, int>. I added dummy data for testing, but you can see the actual call to read the file is left in there, so you can just remove the dummy data and the line that reads it, and it should work ok:
static void Main(string[] args)
{
var fileLines = new List<string>
{
"Lorem, Ipsum, is, simply, dummy, text, of, the, printing, and, typesetting,",
"industry., Lorem, Ipsum, has, been, the, industry's, standard, dummy, text,",
"ever, since, the, 1500s, when, an, ",
"unknown, printer, took, a, galley, of, type, and, scrambled, it, to, make,",
"a, type, specimen, book.,",
"It, has, survived, not, only, five, centuries, but, also, the, leap,",
"into, electronic, typesetting, remaining, essentially, unchanged.,",
"It, was, popularised, in, the, 1960s, with, the, release,",
"of, Letraset, sheets, containing, Lorem, Ipsum, passages, and, more, ",
"recently, with, desktop, publishing,",
"software, like, Aldus, PageMaker, including, versions, of, Lorem, Ipsum."
};
var filePath = #"f:\public\temp\temp.csv";
var fileLinesColumns = File.ReadAllLines(filePath).Select(line => line.Split(','));
var colWidths = new List<int>();
// Remove this line to use file data
fileLinesColumns = fileLines.Select(line => line.Split(','));
// Get the max length of each column and add it to our list
foreach (var fileLineColumns in fileLinesColumns)
{
for (int i = 0; i < fileLineColumns.Length; i++)
{
if (i > colWidths.Count - 1)
{
colWidths.Add(fileLineColumns[i].Length);
}
else if (fileLineColumns[i].Length > colWidths[i])
{
colWidths[i] = fileLineColumns[i].Length;
}
}
}
// Write out our columns, padding each one to match the longest line
foreach (var fileLineColumns in fileLinesColumns)
{
for (int i = 0; i < fileLineColumns.Length; i++)
{
Console.Write(fileLineColumns[i].PadRight(colWidths[i]));
}
Console.WriteLine();
}
Console.Write("\nDone!\nPress any key to exit...");
Console.ReadKey();
}
Output
Initialise your list, then loop over your lines, and within that line, loop over your columns:
for (i = 0; i < lineList.Count; i++)
{
maxElementSize[i] = 0;
}
for (i = 0; i < lineList.Count; i++)
{
for (j = 0; j < maxColumn; j++)
{
if(lineList[i][j].Length > maxElementSize[j])
maxElementSize[j] = lineList[i][j].Length
}
}
I use the following code to make sure the columns in a database are large enough to take the csv input data...
#!/usr/bin/python3
import array as arr
from csv import reader
import argparse
def csv_getFldLens (in_file, has_header=0, delimiter=','):
# open file in read mode
fldMaxLens = arr.array('i')
headers = []
has_header = has_header
with open(in_file, 'r') as read_obj:
# pass the file object to reader() to get the reader object
csv_reader = reader(read_obj, delimiter=delimiter)
# Iterate over each row in the csv using reader object
rcnt = 0
lastIndx = 0
for row in csv_reader:
# row variable is a list that represents a row in csv
# print(row)
if has_header and rcnt == 0:
for fld in row:
headers.append(fld)
rcnt += 1
continue
j = 0
for fld in row:
fldLen = len(fld)
if (lastIndx == 0) or (lastIndx < j):
# print("if --- li, i: ", lastIndx, i, "\n")
fldMaxLens.append(fldLen)
lastIndx = j
else:
# print("else --- li, i: ", lastIndx, i, "\n")
v1 = fldMaxLens[j]
v2 = fldLen
fldMaxLens[j] = max(v1,v2)
j = j + 1
rcnt += 1
j = 0
if has_header:
for f in headers:
print(f,": ", fldMaxLens[j])
j += 1
else:
for i in fldMaxLens:
print("Col[",j+1,"]: ",fldMaxLens[j])
j += 1
if __name__ == "__main__":
parser = argparse.ArgumentParser(description='Get column lengths of CVS fields.')
parser.add_argument('--in_file', default='', help='The CSV input file')
parser.add_argument('--has_header', action='store_true', help='The CSV file has headers')
parser.add_argument('--delimiter', default=',', help='Sets the delimiter. Default is comma \',\'.')
args = parser.parse_args()
csv_getFldLens(in_file=args.in_file, has_header=args.has_header, delimiter=args.delimiter)
i am trying to add a location name to my output text files.
As you can see my numbers are incrementing properly. But i have coded like after number 45 i need to reset the number to 1, also the Carousel:45 should change to ** Carousel1:1**. But it is not happening... why it is not happening. any help please!!!!
My code snippet:
public void just_create_text()
{
//Here we are exporting header
string[] strLines = System.IO.File.ReadAllLines(textBox1.Text);
string CarouselName = enter.Text;
int[] cols = new int[] { 15, 15, 25, 15, 15 };
StringBuilder sb = new StringBuilder();
string line = RemoveWhiteSpace(strLines[0]).Trim();
string[] cells = line.Replace("\"", "").Split('\t');
for (int c = 0; c < cells.Length; c++)
sb.Append(cells[c].Replace(" ", "_").PadRight(cols[c]));
sb.AppendLine("Location".PadRight(15));
sb.AppendLine();
int tmpCarousel = 0;
int carouselNumber = 0;
Dictionary<string, int> namesForCarousels = new Dictionary<string, int>();
for (int i = 0; i < textfile.Count; i++)
{
for (int c = 0; c < cells.Length; c++)
sb.Append(textfile[i].Cells[c].Replace(" ", "_").PadRight(cols[c]));
string name = textfile[i].Cells[1];
if (namesForCarousels.TryGetValue(name, out tmpCarousel) == false)
{
carouselNumber++;
if (carouselNumber > 45)
carouselNumber = 1;//resetting to number1, but name is
//not changing to Carousel1..
namesForCarousels[name] = carouselNumber;
}
var strCorousel = lstMX.Find(x => x.MAX_PN.Equals(name)).Carousel;
strCorousel = (String.IsNullOrEmpty(strCorousel)) ? CarouselName : strCorousel;
sb.Append(String.Format("{0}:{1}", strCorousel, carouselNumber).PadRight(15));
sb.Append("\r\n");
}
System.IO.File.WriteAllText(#"Z:\Desktop\output.TXT", sb.ToString());
}
OUTPUT i need
I need after Carousel:45 >>> i need Carousel1:1. How can i do this..?
You never use the numbers stored in your dictionary namesForCarousels after setting them. Probably you want
sb.Append(String.Format("{0}:{1}", strCorousel, namesForCarousels[name]).PadRight(15));
Also, you should rename carouselNumber to something like carouselNumberCounter. It's not the number of the current carousel, it's a counter used to assign a number to the next carousel. And for additional clarity, get rid of the local variable tmpCarousel and do:
if (!namesForCarousels.ContainsKey(name))
{
You might find it easier to follow your code if you use more descriptive variable names. It's not entirely clear what you're trying to do, but I assume you want to re-use the same carousel number for a given "Max Pn" if you've already allocated it - at the moment, you populate that mapping but you don't use it, you are reliant on max pn being in order. I don't actually see why carousel number wouldn't reset, but if you tidy it up perhaps you have a better chance of seeing what is happening.
Also given your null reference exception from your other question, this protects against that - though it probably indicates another problem elsewhere in the population of your "lstMx".
public static void just_create_text()
{
//Here we are exporting header
string[] strLines = System.IO.File.ReadAllLines(textBox1.Text);
string defaultCarouselName = enter.Text;
int[] columnPaddings = new int[] { 15, 15, 25, 15, 15 };
StringBuilder completedOutputBuilder = new StringBuilder();
string line = RemoveWhiteSpace(strLines[0]).Trim();
string[] cells = line.Replace("\"", "").Split('\t');
for (int c = 0; c < cells.Length; c++)
completedOutputBuilder.Append(cells[c].Replace(" ", "_").PadRight(columnPaddings[c]));
completedOutputBuilder.AppendLine("Location".PadRight(15));
completedOutputBuilder.AppendLine();
int carouselNumberForEntry = 0;
Dictionary<string, int> maxPnToCarouselNumber = new Dictionary<string, int>(StringComparer.OrdinalIgnoreCase);
for (int i = 0; i < textfile.Count; i++)
{
for (int c = 0; c < cells.Length; c++)
completedOutputBuilder.Append(_textfile[i].Cells[c].Replace(" ", "_").PadRight(columnPaddings[c]));
string maxPnForEntry = textfile[i].Cells[1];
int previouslyAllocatedCarouselNumberForMaxPn = 0;
if (maxPnToCarouselNumber.TryGetValue(maxPnForEntry, out previouslyAllocatedCarouselNumberForMaxPn) == false)
{
// assign a new courousel number for this max pn
carouselNumberForEntry++;
if (carouselNumberForEntry > 45)
carouselNumberForEntry = 1;
// for better clarity use add
maxPnToCarouselNumber.Add(maxPnForEntry, carouselNumberForEntry);
}
else
{
// use the carousel number previous assigned for this maxPn
carouselNumberForEntry = previouslyAllocatedCarouselNumberForMaxPn;
}
// find the related max pn carousel entry (if relatedPn is not found this suggests a problem elsewhere)
MAX_PN_Carousel relatedPn = lstMx.Find(x => x.MAX_PN != null && x.MAX_PN.Equals(maxPnForEntry, StringComparison.OrdinalIgnoreCase));
// assign the name from the entry, or use the default carousel name if unavailable
string carouselNameForMaxPn = (relatedPn == null || String.IsNullOrWhiteSpace(relatedPn.Carousel)) ? defaultCarouselName : relatedPn.Carousel;
// add the new column in the output
completedOutputBuilder.Append(String.Format("{0}:{1}", carouselNameForMaxPn, carouselNumberForEntry).PadRight(15));
completedOutputBuilder.Append("\r\n");
}
System.IO.File.WriteAllText(#"c:\dev\output.TXT", completedOutputBuilder.ToString());
}
Ex: 1,4-90, 292,123
It needs to display the whole order information of
1
4,5,6....90
292
123.
Whats the gud approach to solve this.
It is similar to tracking in UPS or fedex if multiple orders are given in search box.
I meant if in a search box I giv 1,4-90, 292,123 this string the result that needs to come back is a grid representation of all the data which is corresponding to each of the order id respectively. I want to know how to parse the string into collection and send them to the database and show the information in the grid for...
1
4,5,6....90
292
123.
as a different row...from where I can generate reports too (alternative)
Please try.
static ArrayList list;
static void Main(string[] args)
{
string str = "1,4-90,292,123";
string[] arr = str.Split(',');
list = new ArrayList();
for (int i = 0; i < arr.Length; i++)
{
string tmp = arr[i];
if (tmp.IndexOf('-') != -1)
{
Range(tmp);
}
else list.Add(int.Parse(tmp));
}
list.Sort();
object[] intResult = list.ToArray();
//print the final result
for (int i = 0; i < intResult.Length; i++)
{
Console.WriteLine(intResult[i].ToString());
}
Console.Read();
}
static void Range(string range)
{
string[] tmpArr = range.Split('-');
int stInt = int.Parse(tmpArr[0]);
int edInt = int.Parse(tmpArr[1]);
int[] intArr = new int[(edInt - stInt) + 1];
for (int i = 0; stInt <= edInt; i++)
{
list.Add(stInt++);
}
}