excel – C # LinqToExcel read data and generate speed

I have created a function that reads an excel document.

There are 2 sheets within the Excel document.

What I do is get some data from Sheet 1 and some data from Sheet 2 and mix that data into one object and write it to another Excel document.

The problem here is that it gets pretty slow as the number of lines increases. This is because I'm using Linq (I'm assuming) to find some of the values ​​needed to complete the object because the lines from Sheet 1 and Sheet 2 are not in the row.

                                                                // Get the current line so we know where to start.
int currentRow = excelWorksheet.Dimension.End.Row;

string campaignDate = string.Join ("", sourceExcelPackage.Worksheet (DATABASE_1_WORKSHEET) .Select (x => x["CAMPAIGN_DATE"].Value));

// Start the real work.
foreach (var line in sourceExcelPackage.Worksheet (EVENT_1_WORKSHEET))
{
// customer number
String customerId = row["CustomerId"].Value.ToString ();

// Create a report object to keep things readable.
ReportObject reportObject = new ReportObject
{
EventType = line["EventType"].Value.ToString (),
Creation date = line["DateCreated"].Value.ToString (),
EmailType = line["Context"].Value.ToString (),
LinkClicked = line["Destination"].Value.ToString (),
CampaignDate = campaignDate,
SupporterID = string.Join ("", sourceExcelPackage.Worksheet (DATABASE_1_WORKSHEET) .Where (x => x["DSM_CustomerID"] == customerId)
.Select (x => x["SUPPORTER_ID"].Value)),

PathwayStageHistoryOID = string.Join ("", sourceExcelPackage.Worksheet (DATABASE_1_WORKSHEET) .Where (x => x["DSM_CustomerID"] == customerId)
.Select (x => x["PATHWAY_STAGE_HISTORY_OID"].Value))
};

// Add next line.
currentRow ++;

// Assign data here.
excelWorksheet.Cells[currentRow, 1].Value = reportObject.SupporterID;
excelWorksheet.Cells[currentRow, 2].Value = reportObject.CampaignDate;
excelWorksheet.Cells[currentRow, 3].Value = reportObject.EmailType;
excelWorksheet.Cells[currentRow, 4].Value = reportObject.DateCreated;
excelWorksheet.Cells[currentRow, 5].Value = reportObject.EventType;
excelWorksheet.Cells[currentRow, 6].Value = reportObject.LinkClicked;
excelWorksheet.Cells[currentRow, 7].Value = reportObject.PathwayStageHistoryOID;

// Get the current line as we like
// use this to make some kind of progress.
Yield Return CurrentRow;
}

As you can see SupporterID and PathwayStageHistoryOID is where I use LinqToExcel within the loop.

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