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V24.1
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Workbook.LoadDocumentAsync(Stream, DocumentFormat, CancellationToken, IProgress<Int32>) Method

SECURITY NOTE

Downloading documents passed into the LoadDocument method may create security issues. Review the following help topic and learn how to spot, analyze, and prohibit unwanted download requests:

Suppress Control Requests to Download Data from External URLs

Asynchronously loads a document in the specified format from a stream. Allows you to 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.v24.1.dll

NuGet Package: DevExpress.Document.Processor

Declaration

public Task<bool> LoadDocumentAsync(
    Stream stream,
    DocumentFormat format,
    CancellationToken cancellationToken,
    IProgress<int> progress
)

Parameters

Name Type Description
stream Stream

A stream that contains document data.

format DocumentFormat

An enumeration member that specifies the format of the loaded document.

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<Boolean>

A task that returns true if the document was loaded successfully; otherwise, false.

Remarks

If you attempt to load a document in an incorrect format, the Workbook.InvalidFormatException event fires. To throw an exception when an invalid document is loaded, set the Workbook.Options.Import.ThrowExceptionOnInvalidDocument property to true.

Handle the Workbook.DocumentLoaded event to determine when you can safely modify the loaded document.

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).

Example: Report Progress of Workbook Operations

The following example asynchronously loads and exports a workbook to PDF. The console window displays the progress of each operation. If the load or export operation takes longer than 30 seconds, it is canceled.

using System;
using System.IO;
using System.Threading;
using System.Threading.Tasks;
using DevExpress.Spreadsheet;
using DevExpress.XtraPrinting;
// ...

static async Task Main(string[] args) {
    var cancellationSource = new CancellationTokenSource(TimeSpan.FromSeconds(30));
    var cancellationToken = cancellationSource.Token;
    try {
        using (Workbook workbook = new Workbook()) {
            Console.WriteLine("Loading a document...");
            using (FileStream docStream = new FileStream("Document.xlsx", FileMode.Open))
            {
                await workbook.LoadDocumentAsync(docStream, DocumentFormat.Xlsx,
                cancellationToken,
                new Progress<int>((progress) => Console.WriteLine($"{progress}%")));
            }
            Console.WriteLine("Exporting to PDF...");
            // Specify PDF export options.
            var pdfOptions = new PdfExportOptions()
            {
                ConvertImagesToJpeg = true,
                ImageQuality = PdfJpegImageQuality.Low
            };
            using (FileStream pdfStream = new FileStream("Result.pdf", FileMode.Create))
            {
                await workbook.ExportToPdfAsync(pdfStream, pdfOptions,
                    cancellationToken,
                    new Progress<int>((progress) => Console.WriteLine($"{progress}%")));
            }
            Console.WriteLine("Done!");
        }
    }
    catch (OperationCanceledException) {
        Console.WriteLine("Cancelled by timeout.");
    }
    finally {
        cancellationSource.Dispose();
    }
}

Calculate Formulas in the Loaded Document

The default calculation mode for a Workbook is Manual. This mode implies that the Spreadsheet does not recalculate formulas when you load a document. Call the Workbook.Calculate or Workbook.CalculateFull method to recalculate all formulas in the workbook.

using (Workbook workbook = new Workbook())
{
    // Load a document.
    // ...
    // Calculate formulas in the document.
    workbook.Calculate();
    // ...
}

Change Calculation Mode

Use the Workbook.Options.CalculationMode property to change the calculation mode for a Workbook.

The following calculation modes are available:

  • Manual (default) - Formulas are calculated only on demand (after the Calculate method call). It allows you to improve document generation speed for large workbooks with multiple formulas.

  • UseDocumentSettings - Uses the calculation mode specified in the loaded document (this value is stored in the Workbook.DocumentSettings.Calculation.Mode property).

  • Automatic - Recalculates formulas each time a cell value, formula, or defined name changes.

using (Workbook workbook = new Workbook())
{
    // Change the calculation mode.
    workbook.Options.CalculationMode = WorkbookCalculationMode.UseDocumentSettings;
    // ...
    // Load a document.
    // ...
}
See Also