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Merged
merged 1 commit into from
Sep 18, 2025
Merged

Merge dimodi-patch-1-spreadstream-3247 into production #3248

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261 changes: 127 additions & 134 deletions knowledge-base/grid-custom-cell-formatting-with-radspreadstreamprocessing.md
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Expand Up @@ -79,171 +79,164 @@ To customize the cell format of the exported file before it reaches the client:
</GridExport>

<GridColumns>
<GridColumn Field="@nameof(SampleData.ProductId)" Title="ID" Width="100px" />
<GridColumn Field="@nameof(SampleData.ProductName)" Title="Product Name" Width="300px" />
<GridColumn Field="@nameof(SampleData.UnitsInStock)" Title="In stock" Width="100px" />
<GridColumn Field="@nameof(SampleData.Price)" Title="Unit Price" Width="200px" />
<GridColumn Field="@nameof(SampleData.Discontinued)" Title="Discontinued" Width="100px" />
<GridColumn Field="@nameof(SampleData.FirstReleaseDate)" Title="Release Date" Width="300px" />
<GridColumn Field="@nameof(Product.Id)" Title="ID" Width="60px" />
<GridColumn Field="@nameof(Product.Name)" Title="Product Name" Width="180px" />
<GridColumn Field="@nameof(Product.Price)" Width="160px" />
<GridColumn Field="@nameof(Product.Quantity)" Width="120px" />
<GridColumn Field="@nameof(Product.ReleaseDate)" Title="Release Date" DisplayFormat="{0:d}" Width="240px" />
<GridColumn Field="@nameof(Product.Discontinued)" Width="160px" />
</GridColumns>
</TelerikGrid>

@code {
private List<SampleData> GridData { get; set; }
private List<Product> GridData { get; set; } = new();

private bool ExportAllPages { get; set; }

private async Task OnExcelAfterExport(GridAfterExcelExportEventArgs args)
private void OnExcelAfterExport(GridAfterExcelExportEventArgs args)
{
var bytes = args.Stream.ToArray();
byte[] bytes = args.Stream.ToArray();

var excelStream = new MemoryStream(bytes);
using MemoryStream importStream = new MemoryStream(bytes);

var export = new MemoryStream();
using MemoryStream exportStream = new MemoryStream();

//define the desired styling - https://docs.telerik.com/devtools/document-processing/libraries/radspreadstreamprocessing/features/cell-styles
SpreadCellFormat markedCell = new SpreadCellFormat()
{
Fill = SpreadPatternFill.CreateSolidFill(new SpreadColor(230, 238, 223)),
IsBold = true
};
// Define the desired styling.
// https://docs.telerik.com/devtools/document-processing/libraries/radspreadstreamprocessing/features/cell-styles
SpreadCellFormat customCellFormat = new SpreadCellFormat()
{
Fill = SpreadPatternFill.CreateSolidFill(new SpreadColor(230, 238, 223)),
IsBold = true
};

// Import the stream to modify it and then export it.
// https://docs.telerik.com/devtools/document-processing/libraries/radspreadstreamprocessing/model/workbook
using IWorkbookImporter workBookImporter = SpreadImporter.CreateWorkbookImporter(SpreadDocumentFormat.Xlsx, importStream);

//import the stream to modify it and then export it -
//see https://docs.telerik.com/devtools/document-processing/libraries/radspreadstreamprocessing/model/workbook
using (excelStream)
using IWorkbookExporter workbookExporter = SpreadExporter.CreateWorkbookExporter(SpreadDocumentFormat.Xlsx, exportStream);

// Loop through the sheets to copy their content.
foreach (IWorksheetImporter worksheetImporter in workBookImporter.WorksheetImporters)
{
using (IWorkbookImporter workBookImporter = SpreadImporter.CreateWorkbookImporter(SpreadDocumentFormat.Xlsx, excelStream))
using IWorksheetExporter worksheetExporter = workbookExporter.CreateWorksheetExporter(worksheetImporter.Name);

// Set fixed width to all columns.
// If you need to autofit the content, use the CellContentSizeHelper:
//https://docs.telerik.com/devtools/document-processing/libraries/radspreadstreamprocessing/features/text-measuring
for (int i = 0; i < 6; i++)
{
IColumnExporter column = worksheetExporter.CreateColumnExporter();

column.SetWidthInPixels(160);

column.Dispose();
}

int lastRow = 0;

using (IWorkbookExporter workbookExporter = SpreadExporter.CreateWorkbookExporter(SpreadDocumentFormat.Xlsx, export))
// Loop through the rows to copy their content.
foreach (IRowImporter rowImporter in worksheetImporter.Rows)
{
//loop through the sheets to copy their content
foreach (IWorksheetImporter worksheetImporter in workBookImporter.WorksheetImporters)
int rowDifference = rowImporter.RowIndex - lastRow;

// Ensure proper row order in case there are any empty rows.
if (rowDifference > 1)
{
using (var worksheetExporter = workbookExporter.CreateWorksheetExporter(worksheetImporter.Name))
worksheetExporter.SkipRows(rowDifference - 1);
}

int lastColumn = 0;

using IRowExporter rowExporter = worksheetExporter.CreateRowExporter();

// Loop through the cells to copy their content.
foreach (ICellImporter cellImporter in rowImporter.Cells)
{
string value = cellImporter.Value;

if (string.IsNullOrEmpty(value))
{
//this sets fixed width to all columns.
//If you need to autofit the content, use the CellContentSizeHelper -
//https://docs.telerik.com/devtools/document-processing/libraries/radspreadstreamprocessing/features/text-measuring
for (int i = 0; i < 5; i++)
{
var column = worksheetExporter.CreateColumnExporter();

column.SetWidthInPixels(100);

column.Dispose();
}

int lastRow = 0;

//loop through the rows to copy their content
foreach (IRowImporter rowImporter in worksheetImporter.Rows)
{
int rowDifference = rowImporter.RowIndex - lastRow;

//this part ensures the proper cells order in case there are any empty rows
if (rowDifference > 1)
{
worksheetExporter.SkipRows(rowDifference - 1);
}

int lastColumn = 0;

using (var rowExporter = worksheetExporter.CreateRowExporter())
{
//loop through the cells to copy their content
foreach (ICellImporter cellImporter in rowImporter.Cells)
{
string value = cellImporter.Value;

if (string.IsNullOrEmpty(value))
{
continue;
}

var valueType = cellImporter.ValueType;


var importedFormat = new SpreadCellFormat();

if (cellImporter.Format != null)
{
importedFormat = cellImporter.Format;
}


int cellDifference = cellImporter.ColumnIndex - lastColumn;

//this part ensures the proper cells order in case there are any empty cells
if (cellDifference > 1)
{
rowExporter.SkipCells(cellDifference - 1);
}

//check the cell value to apply proper formatting
using (var cellExporter = rowExporter.CreateCellExporter())
{
switch (valueType)
{
case CellValueType.Boolean:
var boolValue = bool.Parse(value);
cellExporter.SetValue(boolValue);
break;
case CellValueType.Number:
var dateNumberValue = double.Parse(value);
cellExporter.SetFormat(importedFormat);
cellExporter.SetValue(dateNumberValue);
break;
case CellValueType.Error:
case CellValueType.Text:
case CellValueType.SharedString:
case CellValueType.RichText:
cellExporter.SetValue(value);
break;
}

//apply the defined style to the desired cells
if (cellImporter.RowIndex == 0)
{
cellExporter.SetFormat(markedCell);
}
}

lastColumn = cellImporter.ColumnIndex;
}
}

lastRow = rowImporter.RowIndex;
}
continue;
}

CellValueType valueType = cellImporter.ValueType;

SpreadCellFormat importedFormat = new SpreadCellFormat();

if (cellImporter.Format != null)
{
importedFormat = cellImporter.Format;
}

int cellDifference = cellImporter.ColumnIndex - lastColumn;

// Ensure proper cell order in case there are any empty cells.
if (cellDifference > 1)
{
rowExporter.SkipCells(cellDifference - 1);
}

// Check the cell value to apply proper formatting.
using ICellExporter cellExporter = rowExporter.CreateCellExporter();

switch (valueType)
{
case CellValueType.Boolean:
bool boolValue = bool.Parse(value);
cellExporter.SetValue(boolValue);
break;
case CellValueType.Number:
double dateNumberValue = double.Parse(value);
cellExporter.SetFormat(importedFormat);
cellExporter.SetValue(dateNumberValue);
break;
case CellValueType.Error:
case CellValueType.Text:
case CellValueType.SharedString:
case CellValueType.RichText:
cellExporter.SetValue(value);
break;
}

// Apply the defined style to the desired cells.
if (cellImporter.RowIndex == 0)
{
cellExporter.SetFormat(customCellFormat);
}

lastColumn = cellImporter.ColumnIndex;
}

lastRow = rowImporter.RowIndex;
}
}

//pass the modified stream to the event arguments
args.Stream = export;
// Pass the modified stream to the GridAfterExcelExportEventArgs event argument.
args.Stream = exportStream;
}

protected override void OnInitialized()
{
GridData = Enumerable.Range(1, 100).Select(x => new SampleData
{
ProductId = x,
ProductName = "Product " + x,
UnitsInStock = x * 2,
Price = 3.14159m * x,
Discontinued = x % 4 == 0,
FirstReleaseDate = DateTime.Now.AddDays(-x)
}).ToList();
Random rnd = Random.Shared;
GridData = Enumerable.Range(1, 100).Select(x => new Product
{
Id = x,
Name = $"Product {x}",
Price = rnd.Next(1, 100) * 1.23m,
Quantity = rnd.Next(0, 100),
ReleaseDate = DateTime.Now.AddDays(-rnd.Next(1, 1000)),
Discontinued = x % 4 == 0
}).ToList();
}

public class SampleData
public class Product
{
public int ProductId { get; set; }
public string ProductName { get; set; }
public int UnitsInStock { get; set; }
public int Id { get; set; }
public string Name { get; set; } = string.Empty;
public decimal Price { get; set; }
public int Quantity { get; set; }
public DateTime ReleaseDate { get; set; }
public bool Discontinued { get; set; }
public DateTime FirstReleaseDate { get; set; }
}
}
````
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