ZipArchive.Progress Event

Occurs evenly while the items are being compressed to indicate progress.

Namespace: DevExpress.Compression

Assembly: DevExpress.Docs.v18.2.dll

Declaration

C#

public event ProgressEventHandler Progress

VB.NET

Public Event Progress As ProgressEventHandler

Event Data

The Progress event's data class is ProgressEventArgs. The following properties provide information specific to this event:

Property	Description
CanContinue	Gets or sets the value that specifies whether the process can proceed further. Inherited from CanContinueEventArgs.
Progress	Obtains the progress value.

Remarks

By handling the Progress event, you can obtain information about the progress of zipping the archive items. You can also interrupt archive creation by setting the CanContinueEventArgs.CanContinue value to false. After that, the archive is saved with all items which have been zipped to that point and the process is finished.

The following code snippet illustrates how you can use the volatile variable to interrupt archive creation at any time. When the Progress event occurs, the event handler checks for the stopProgress value. If it is true, the process stops.

Note

A complete sample project is available at https://github.com/DevExpress-Examples/compression-library-examples-e4695

ZipExamples.cs

using DevExpress.Compression;
        volatile bool stopProgress = false;

        public void CancelArchiveProgress() {
            string[] sourcefiles = this.sourceFiles;
            using (ZipArchive archive = new ZipArchive()) {
                archive.Progress += archive_Progress;
                foreach (string file in sourceFiles) {
                    archive.AddFile(file, "/");
                }
                archive.Save("Documents\\CancelArchiveProgress.zip");
            }
        }

        private void archive_Progress(object sender, ProgressEventArgs args) {
            args.CanContinue = !this.stopProgress;
        }

ZipExamples.vb

Imports DevExpress.Compression
'INSTANT VB TODO TASK: There is no VB.NET equivalent to 'volatile':
'ORIGINAL LINE: volatile bool stopProgress = False;
        Private stopProgress As Boolean = False

        Public Sub CancelArchiveProgress()
            Dim sourcefiles() As String = Me.sourceFiles
            Using archive As New ZipArchive()
                AddHandler archive.Progress, AddressOf archive_Progress
                For Each file As String In Me.sourceFiles
                    archive.AddFile(file, "/")
                Next file
                archive.Save("Documents\CancelArchiveProgress.zip")
            End Using
        End Sub

        Private Sub archive_Progress(ByVal sender As Object, ByVal args As ProgressEventArgs)
            args.CanContinue = Not Me.stopProgress
        End Sub

Related GitHub Examples

The following code snippet (auto-collected from DevExpress Examples) contains a reference to the Progress event.

Note

The algorithm used to collect these code examples remains a work in progress. Accordingly, the links and snippets below may produce inaccurate results. If you encounter an issue with code examples below, please use the feedback form on this page to report the issue.

C#

zip-compression-and-archive-api-examples-e4695/CS/CompressionLibraryExamples/ZipExamples.cs#L121

using (ZipArchive archive = new ZipArchive()) {
    archive.Progress += archive_Progress;
    foreach (string file in sourceFiles) {

VB.NET

zip-compression-and-archive-api-examples-e4695/VB/CompressionLibraryExamples/ZipExamples.vb#L127

Using archive As New ZipArchive()
    AddHandler archive.Progress, AddressOf archive_Progress
    For Each file As String In Me.sourceFiles