Workbook.ExportToHtmlAsync(String, HtmlDocumentExporterOptions, CancellationToken, IProgress<Int32>) Method

SECURITY-RELATED CONSIDERATIONS

Using file paths sourced from untrusted input may expose unauthorized files or allow unintended file access. Always validate and normalize all external paths to prevent path manipulation.

Asynchronously exports document data to a file in HTML format. Allows you to specify export options, implement progress notifications, and cancel the operation.

You need a 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.v25.2.dll

NuGet Package : DevExpress.Document.Processor

csharp

public Task ExportToHtmlAsync(
    string fileName,
    HtmlDocumentExporterOptions options,
    CancellationToken cancellationToken,
    IProgress<int> progress
)

Public Function ExportToHtmlAsync(
    fileName As String,
    options As HtmlDocumentExporterOptions,
    cancellationToken As CancellationToken,
    progress As IProgress(Of Integer)
) As Task

Parameters

Name	Type	Description
fileName	String

The full path (including the file name and extension) to the output file.

| | options | HtmlDocumentExporterOptions |

An object that defines export options.

| | cancellationToken | CancellationToken |

A cancellation token that indicates whether to cancel the operation.

| | progress | IProgress<Int32> |

An object used to report the task progress in percentage. Use a Progress<T> class instance to report progress.

Returns

Type	Description
Task

An object that defines the 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).

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.