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.NET Framework 4.5.2+
.NET Framework 4.5.2+
.NET Standard 2.0+
Row

Workbook.ExportToHtmlAsync(Stream, CellRange, CancellationToken) Method

Asynchronously exports the specified range to the specified stream in HTML format.

You need an active license for the DevExpress Office File API Subscription or DevExpress Universal Subscription to use this method in production code.

Namespace: DevExpress.Spreadsheet

Assembly: DevExpress.Docs.v21.2.dll

Declaration

public Task ExportToHtmlAsync(
    Stream stream,
    CellRange range,
    CancellationToken cancellationToken
)

Parameters

Name Type Description
stream Stream

A Stream object to which the created HTML file should be sent.

range CellRange

A CellRange object to be exported to HTML.

cancellationToken CancellationToken

A CancellationToken object used to trace the requests to cancel an operation.

Returns

Type Description
Task

An Task object representing an asynchronous export operation.

Remarks

Important

Take into account the following when you call this method:

  • The events fired by this method call may occur in a different thread than the target operation.

  • The operation is not thread safe (the document should not be accessed simultaneously by different threads). Wait until the operation is completed before you continue to work with the document (for example, use the await operator).

The code sample below asynchronously exports the first worksheet of the loaded XLSX document to HTML using the CancellationToken object:

private async void ConvertXlsx2HtmlWithCancellation()
{
  using (CancellationTokenSource source = new CancellationTokenSource(10000))
  {
    using (Workbook workbook = new Workbook())
      {
          try
          {
              await workbook.LoadDocumentAsync("Document.xlsx", source.Token);
              await workbook.ExportToHtmlAsync("Result.html", 0, source.Token);
          }
          catch (OperationCanceledException)
          {
              // Your code to handle cancellation.
          }
      }
  }
}

Calculate Formulas Before Export

The default calculation mode for a Workbook is Manual. This mode implies that the Spreadsheet does not recalculate formulas before it generates an HTML file. Call the Workbook.Calculate or Workbook.CalculateFull method to calculate all formulas in the workbook before you export it to HTML.

See Also