Handle errors

The following example shows you how to handle errors. A WebdavException carries the HTTP status, the reason the server gave (Condition) and the response; network failures are HttpRequestException and timeouts TimeoutException.

C# example

using System;
using System.IO;
using System.Net;
using System.Net.Http;
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/");

                try
                {
                    await client.Download("documents/missing.pdf", new MemoryStream());
                }
                catch (WebdavException e) when (e.StatusCode == HttpStatusCode.NotFound)
                {
                    Console.WriteLine("Not found: " + e.RequestUri);
                }

                try
                {
                    await client.CreateCollection("no/such/parent/");
                }
                catch (WebdavException e)
                {
                    // For example 409 (Conflict): the parent collection does not exist.
                    Console.WriteLine((int)e.StatusCode + " " + e.ReasonPhrase);

                    // The precondition the server reported, for example {DAV:}lock-token-submitted.
                    if (e.Condition != null)
                    {
                        Console.WriteLine("Condition: " + e.Condition);
                    }
                }

                try
                {
                    client.Timeout = TimeSpan.FromSeconds(30);
                    await client.List("documents/");
                }
                catch (TimeoutException e)
                {
                    Console.WriteLine(e.Message);
                }
                catch (HttpRequestException e)
                {
                    Console.WriteLine("The server could not be reached: " + e.Message);
                }
            }
        }
    }
}

VB example

Imports System
Imports System.IO
Imports System.Net
Imports System.Net.Http
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/")

                Try
                    Await client.Download("documents/missing.pdf", New MemoryStream())
                Catch e As WebdavException When e.StatusCode = HttpStatusCode.NotFound
                    Console.WriteLine("Not found: " & e.RequestUri.ToString())
                End Try

                Try
                    Await client.CreateCollection("no/such/parent/")
                Catch e As WebdavException
                    ' For example 409 (Conflict): the parent collection does not exist.
                    Console.WriteLine(CInt(e.StatusCode) & " " & e.ReasonPhrase)

                    ' The precondition the server reported, for example {DAV:}lock-token-submitted.
                    If e.Condition IsNot Nothing Then
                        Console.WriteLine("Condition: " & e.Condition.ToString())
                    End If
                End Try

                Try
                    client.Timeout = TimeSpan.FromSeconds(30)
                    Await client.List("documents/")
                Catch e As TimeoutException
                    Console.WriteLine(e.Message)
                Catch e As HttpRequestException
                    Console.WriteLine("The server could not be reached: " & e.Message)
                End Try
            End Using
        End Function
    End Module
End Namespace

WebDAV .NET > Tutorial > Handle errors

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