XtraReport.ExportToMailAsync(MailMessageExportOptions, CancellationToken) Method

Asynchronously exports a report to HTML and inserts it into a specified e-mail message.

Namespace : DevExpress.XtraReports.UI

Assembly : DevExpress.XtraReports.v25.2.dll

NuGet Package : DevExpress.Reporting.Core

csharp

public Task<AlternateView> ExportToMailAsync(
    MailMessageExportOptions options = null,
    CancellationToken token = default(CancellationToken)
)

Public Function ExportToMailAsync(
    options As MailMessageExportOptions = Nothing,
    token As CancellationToken = Nothing
) As Task(Of AlternateView)

Optional Parameters

Name	Type	Default	Description
options	MailMessageExportOptions	null

The mail message export options.

A cancellation token that the task observes.

Returns

Type	Description
Task<AlternateView>

A task that exports the report.

Remarks

This method is equivalent to the ExportToMail(MailMessageExportOptions) method but does not lock other actions performed concurrently. For instance, the user interface remains operational while the application exports a report.

Call ExportToMailAsync from an async method. Prefix the call with the await operator, as shown in the code sample below.

The optional CancellationToken parameter provides a way to send the cancellation signal to the task. The task monitors the token and stops when it receives the signal. Create a CancellationTokenSource class instance and pass its Token property to the ExportToMailAsync method call. Call the CancellationTokenSource.Cancel method to stop the task.

Example

The code sample below exports a report to mail message asynchronously. A CancellationTokenSource class instance is used to allow users to interrupt the report export if it takes too long.

C#
VB.NET

csharp

using DevExpress.XtraReports.UI;
using System;
using System.Threading;
// ...
using System.Net.Mail;
// ...
// Use cancellationTokenSource to allow users to stop the document creation process.
CancellationTokenSource cancellationTokenSource = new CancellationTokenSource();
// ...
// The cancelButton_Click event handler uses cancellationTokenSource to stop the document creation process.
private void cancelButton_Click(object sender, EventArgs e)
{
    cancellationTokenSource.Cancel();
}
// ...
async public void ExportReportToMailWithOptionsAsync()
{
    // Create a simple report.
    XtraReport report = new XtraReport()
    {
        Name = "SimpleReport",
        Bands = {
            new DetailBand() {
                Controls = {
                    new XRLabel() {
                        Text = "Simple Report"
                    }
                }
            }
        }
    };
    // Export the report as AlternateView to include in a mail message.
    AlternateView altView = await report.ExportToMailAsync(null, cancellationTokenSource.Token);

}

Imports DevExpress.XtraReports.UI
Imports System.Threading
' ...
Imports System.Net.Mail
' ...
' Use cancellationTokenSource to allow users to stop the document creation process.
Private cancellationTokenSource As New CancellationTokenSource()
' ...
' The cancelButton_Click event handler uses cancellationTokenSource to stop the document creation process.
Private Sub cancelButton_Click(ByVal sender As Object, ByVal e As EventArgs)
    cancellationTokenSource.Cancel()
End Sub
' ...
Public Async Sub ExportReportToMailWithOptionsAsync()
    ' Create a simple report.
    Dim report = New XtraReport() With {.Name = "SimpleReport"}
    Dim band = New DetailBand()
    Dim control = New XRLabel() With {.Text = "Simple Report"}
    band.Controls.Add(control)
    report.Bands.Add(band)
    ' Export the report as AlternateView to include in a mail message.
    Dim altView As AlternateView = Await report.ExportToMailAsync(Nothing, cancellationTokenSource.Token)
End Sub