Resume an interrupted download

The following example shows you how to continue a download that was interrupted: only the missing part is downloaded.

C# example

using System;
using System.IO;
using System.Net;
using System.Threading.Tasks;
using Independentsoft.Webdav;

namespace Sample
{
    class Program
    {
        static async Task Main(string[] args)
        {
            NetworkCredential credential = new NetworkCredential("username", "password");

            using (WebdavClient client = new WebdavClient(credential))
            {
                client.BaseAddress = new Uri("https://myserver/dav/");

                string localFile = "report.pdf";
                long existing = File.Exists(localFile) ? new FileInfo(localFile).Length : 0;

                // Asks the server for the content from the given position (a Range request).
                using (Stream remote = await client.OpenRead("documents/report.pdf", existing))
                using (FileStream local = new FileStream(localFile, FileMode.Append))
                {
                    await remote.CopyToAsync(local);
                }

                Console.WriteLine("Resumed at " + existing + " bytes, file has " + new FileInfo(localFile).Length + " bytes.");
            }
        }
    }
}

VB example

Imports System
Imports System.IO
Imports System.Net
Imports System.Threading.Tasks
Imports Independentsoft.Webdav

Namespace Sample
    Module Program
        Sub Main(args As String())
            RunAsync().GetAwaiter().GetResult()
        End Sub

        Private Async Function RunAsync() As Task
            Dim credential As New NetworkCredential("username", "password")

            Using client As New WebdavClient(credential)
                client.BaseAddress = New Uri("https://myserver/dav/")

                Dim localFile As String = "report.pdf"
                Dim existing As Long = If(File.Exists(localFile), New FileInfo(localFile).Length, 0)

                ' Asks the server for the content from the given position (a Range request).
                Using remote As Stream = Await client.OpenRead("documents/report.pdf", existing)
                    Using local As New FileStream(localFile, FileMode.Append)
                        Await remote.CopyToAsync(local)
                    End Using
                End Using

                Console.WriteLine("Resumed at " & existing & " bytes, file has " & New FileInfo(localFile).Length & " bytes.")
            End Using
        End Function
    End Module
End Namespace

WebDAV .NET > Tutorial > Resume an interrupted download

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