Develop Reference

How to add values in a validation list at once?

I'm trying to add values to a IExcelDataValidationList but the way I'm doing it right now is not very efficient.
I need to create many rows in my worksheet and populate a list for a certain cell for each of these rows. When I have many values to add to the list, this is taking forever.
for (var x = headerRowIndex + 1; x < 1000; x++)
{
var address = ExcelCellBase.TranslateFromR1C1($"R{x}C{colIndex}", 0, 0);
IExcelDataValidationList list = mainWorksheet.DataValidations.AddListValidation(address);
foreach (var e in values)
{
list.Formula.Values.Add(e);
}
}
You see how this can take a long time if values contain a lot of options.
Here's what I tried:
List<string> validationValues = new List<string>();
validationValues = values.ToList();
for (var x = headerRowIndex + 1; x < 1000; x++)
{
var address = ExcelCellBase.TranslateFromR1C1($"R{x}C{colIndex}", 0, 0);
var list = mainWorksheet.DataValidations.AddListValidation(address);
((List<string>)list.Formula.Values).AddRange(validationValues);
}
So I'm trying to add all values to the list at once. This compiles fine, but I'm getting this exception:
System.InvalidCastException: 'Unable to cast object of type
'DataValidationList' to type
'System.Collections.Generic.List`1[System.String]'.'
I've tried casting directly to DataValidationList but it's defined at private and only accessible by EPPlus itself.
Any ideas ?

Instead of creating IExcelDataValidationList per cell, create one for the whole column (address can include range of cells):
var address = ExcelCellBase.GetAddress(headerRowIndex + 1, colIndex, headerRowIndex + 1000, colIndex, true); // whole column
IExcelDataValidationList list = mainWorksheet.DataValidations.AddListValidation(address);
foreach (var e in values)
{
list.Formula.Values.Add(e);
}

The source contains no DataRows. error when one iteration in for loop

I am making a program in Visual Studio where you can read in an excel file in a specific format and where my program converts the data from the excel file in a different format and stores it in a database table.
Below you can find a part of my code where something strange happens
//copy schema into new datatable
DataTable _longDataTable = _library.Clone();
foreach (DataRow drlibrary in _library.Rows)
{
//count number of variables in a row
string check = drlibrary["Check"].ToString();
int varCount = check.Length - check.Replace("{", "").Length;
int count_and = 0;
if (check.Contains("and") || check.Contains("or"))
{
count_and = Regex.Matches(check, "and").Count;
varCount = varCount - count_and;
}
//loop through number of counted variables in order to add rows to long datatable (one row per variable)
for (int i = 1; i <= varCount; i++)
{
var newRow = _longDataTable.NewRow();
newRow.ItemArray = drlibrary.ItemArray;
string j = i.ToString();
//fill variablename with variable number
if (i < 10)
{
newRow["VariableName"] = "Variable0" + j;
}
else
{
newRow["VariableName"] = "Variable" + j;
}
}
}
When varCount equals 1, I get the following error message when running the program after inserting an excel file
The source contains no DataRows.
I don't know why I can't run the for loop with just one iteration. Anyone who can help me?

How to read all lines from notepad comma separated and updated specific column conditionally in C#

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

Get first value in CSV column without duplicates

I am getting a list of items from a csv file via a Web Api using this code:
private List<Item> items = new List<Item>();
public ItemRepository()
{
string filename = HttpRuntime.AppDomainAppPath + "App_Data\\items.csv";
var lines = File.ReadAllLines(filename).Skip(1).ToList();
for (int i = 0; i < lines.Count; i++)
{
var line = lines[i];
var columns = line.Split('$');
//get rid of newline characters in the middle of data lines
while (columns.Length < 9)
{
i += 1;
line = line.Replace("\n", " ") + lines[i];
columns = line.Split('$');
}
//Remove Starting and Trailing open quotes from fields
columns = columns.Select(c => { if (string.IsNullOrEmpty(c) == false) { return c.Substring(1, c.Length - 2); } return string.Empty; }).ToArray();
var temp = columns[5].Split('|', '>');
items.Add(new Item()
{
Id = int.Parse(columns[0]),
Name = temp[0],
Description = columns[2],
Photo = columns[7]
});
}
}
The Name attribute of the item list must come from column whose structure is as follows:
Groups>Subgroup>item
Therefore I use var temp = columns[5].Split('|', '>'); in my code to get the first element of the column before the ">", which in the above case is Groups. And this works fine.
However, I a getting many duplicates in the result. This is because other items in the column may be:
(These are some of the entries in my csv column 9)
Groups>Subgroup2>item2, Groups>Subgroup3>item4, Groups>Subgroup4>item9
All start with Groups, but I only want to get Groups once.
As it is I get a long list of Groups. How do I stop the duplicates?
I want that if an Item in the list is returned with the Name "Groups", that no other item with that name would be returned. How do I make this check and implement it?

If you are successfully getting the list of groups, take that list of groups and use LINQ:
var undupedList = dupedList
.Distinct();
Update: The reason distinct did not work is because your code is requesting not just Name, but also, Description, etc...If you only ask for Name, Distinct() will work.
Update 2: Try this:
//Check whether already exists
if((var match = items.Where(q=>q.Name == temp[0])).Count==0)
{
items.add(...);
}

How about using a List to store Item.Name?
Then check List.Contains() before calling items.Add()
Simple, only 3 lines of code, and it works.
IList<string> listNames = new List();
//
for (int i = 0; i < lines.Count; i++)
{
//
var temp = columns[5].Split('|', '>');
if (!listNames.Contains(temp[0]))
{
listNames.Add(temp[0]);
items.Add(new Item()
{
//
});
}
}

Optimal Column Width OpenOffice Calc

I'm entering data from a CSV file into a OpenOffice spreadsheet.
This code gets the a new sheet in a spreadsheet:
Public Spreadsheet getSpreadsheet(int sheetIndex, XComponent xComp)
{
XSpreadsheet xSheets = ((XSpreadsheetDocument)xComp).getSheets();
XIndexAccess xSheetIA = (XIndexAccess)xSheets;
XSpreadsheet XSheet = (XSpreadsheet)xSheetsA.getByIndex(sheetIndex).Value;
return XSheet;
}
I then have method that enters a list into a cell range one cell at a time. I want to be able to automatically set the column size for these cells. which is something like
string final DataCell;
Xspreadsheet newSheet = getSpreadsheet(sheetIndex, xComp);
int numberOfRecords = ( int numberOfColumns * int numberOfRows);
for(cellNumber = 0; cellNumber < numberOfrecords; cellNumber++)
{
XCell tableData = newSheet.getCellbyPosition(columnValue, rowValue);
((XText)tableData).setString(finalDataCell);
column Value++;
if(columnValue > = numberOfColumns)
{
rowVal++ column = 0;
}
}
After googling i have found the function:
columns.OptimalWidth = True on http://forum.openoffice.org/en/forum/viewtopic.php?f=20&t=31292
but im unsure on how to use this. Could anyone explain this further or think of another way to have the cell autofit?

I understand the comments in the code are in Spanish I think, but the code is in English. I ran the comments through Google translate so now they are in English. I copied it from here:
//Auto Enlarge col width
private void largeurAuto(string NomCol)
{
XCellRange Range = null;
Range = Sheet.getCellRangeByName(NomCol + "1"); //Recover the range, a cell is
XColumnRowRange RCol = (XColumnRowRange)Range; //Creates a collar ranks
XTableColumns LCol = RCol.getColumns(); // Retrieves the list of passes
uno.Any Col = LCol.getByIndex(0); //Extract the first Col
XPropertySet xPropSet = (XPropertySet)Col.Value;
xPropSet.setPropertyValue("OptimalWidth", new one.Any((bool)true));
}
What this does it this: First it gets the range name and then gets the first column. The real code, though, is XpropertySet being used, which is explained REALLY well here.

public void optimalWidth(XSpreadsheet newSheet)
{
// gets the used range of the sheet
XSheetCellCursor XCursor = newSheet.createCursor();
XUsedAreaCursor xUsedCursor = (XUsedAreaCursor)XCursor;
xUsedCursor.gotoStartOfUsedArea(true);
xUsedCursor.gotoEndOfUsedArea(true);
XCellRangeAddressable nomCol = (XCellRangeAddressable)xUsedCursor;
XColumnRowRange RCol = (XColumnRowRange)nomCol;
XTableColumns LCol = RCol.getColumns();
// loops round all of the columns
for (int i = 0; i < nomCol.getRangeAddress().EndColumn;i++)
{
XPropertySet xPropSet = (XPropertySet)LCol.getByIndex(i).Value;
xPropSet.setPropertyValue("OptimalWidth", new uno.Any(true));
}
}