XtraReport.ExportToMailAsync(String, String, String, CancellationToken) Method

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

Namespace: DevExpress.XtraReports.UI

Assembly: DevExpress.XtraReports.v23.2.dll

NuGet Package: DevExpress.Reporting.Core

Declaration

C#

public Task<MailMessage> ExportToMailAsync(
    string from,
    string to,
    string subject,
    CancellationToken token = default(CancellationToken)
)

VB.NET

Public Function ExportToMailAsync(
    from As String,
    to As String,
    subject As String,
    token As CancellationToken = Nothing
) As Task(Of MailMessage)

Parameters

Name	Type	Description
from	String	The message sender.
to	String	A comma-separated list of recipients.
subject	String	The e-mail subject.

Optional Parameters

Name	Type	Default	Description
token	CancellationToken	null	A cancellation token that the task observes.

Returns

Type	Description
Task<MailMessage>	A task that exports the report.

Remarks

This method is equivalent to the ExportToMail(String, String, String) 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#

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 ExportReportToMailAsync()
{
    // Create a simple report.
    XtraReport report = new XtraReport()
    {
        Name = "SimpleReport",
        Bands = {
            new DetailBand() {
                Controls = {
                    new XRLabel() {
                        Text = "Simple Report"
                    }
                }
            }
        }
    };
    // Configure an SMTP client.
    SmtpClient client = new SmtpClient("mail.smtpclient.test", 25)
    {
        Credentials = new System.Net.NetworkCredential("username", "password"),
        EnableSsl = true
    };
    // Export the report to MailMessage format.
    MailMessage message = await report.ExportToMailAsync(
        "[e-mail]",
        "[e-mail], [e-mail]",
        "Subject",
        cancellationTokenSource.Token);
    // Send the exported report.
    client.Send(message);
}

VB.NET

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 ExportReportToMailAsync()
    ' 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)

    ' Configure an SMTP client.
    Dim client As New SmtpClient("mail.smtpclient.test", 25) With {
        .Credentials = New System.Net.NetworkCredential("username", "password"),
        .EnableSsl = True}
    ' Export the report to MailMessage format.
    Dim message As MailMessage = Await report.ExportToMailAsync("[e-mail]",
                                                                "[e-mail], 
                                                                [e-mail]",
                                                                "Subject",
                                                                cancellationTokenSource.Token)
    ' Send the exported report.
    client.Send(message)
End Sub