Could not find file or assembly System.Web.Services

Question

I am trying to execute the below code to retrieve details from Sharepoint using C#. It is giving error:

System.IO.FileNotFoundException: 'Could not load file or assembly 'System.Web.Services, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'. The system cannot find the file specified.'

using (ClientContext spcontext = new ClientContext("siteURL"))
{
     spcontext.AuthenticationMode = ClientAuthenticationMode.FormsAuthentication;
     spcontext.FormsAuthenticationLoginInfo = new FormsAuthenticationLoginInfo("UserName","Password");
     spcontext.Load(spcontext.Web, w => w.Title, w => w.ServerRelativeUrl, w => w.Lists);
     spcontext.ExecuteQuery();
     Console.WriteLine(spcontext.Web.ServerRelativeUrl);
}

My application is ASP.NET Core 3.1.

check you config file for "System.Web.Services", see if its there or not or if the version is different — AHMED SAJJAD, Jul 30 '21 at 14:23
@AHMEDSAJJAD There is no details of System.Web.Services in that — RKh, Jul 30 '21 at 14:29
Does this answer your question? [System.Web.Services namespace in .net core](https://stackoverflow.com/questions/36544471/system-web-services-namespace-in-net-core) — Manish, Jul 31 '21 at 15:39

score 2 · Answer 1 · answered Jul 31 '21 at 09:32

2

System.Web.Services does not exist on .NET Core.

answered Jul 31 '21 at 09:32

davidfowl

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In that case what is the solution? Any other Sharepoint library which works with .NET Core ? – RKh Aug 02 '21 at 10:55
I'm not aware of any. Maybe keep it in a .NET Framework process and call it from your .NET Core process over HTTP. – davidfowl Aug 03 '21 at 05:40
You mean I need to change the target framework to .NET 4 or rewrite the application in .NET Framework 4 ? – RKh Aug 03 '21 at 10:05
In the answer suggested here: https://stackoverflow.com/questions/62918952/alternative-save-openbinarydirect-methods-for-csom-for-sharepoint-online/62930801#62930801, I am not getting AuthenticationManager class and GetContext method. By added reference to OfficePnPCore, I got AuthenticationManager but there is no GetContext. – RKh Aug 03 '21 at 11:34

Could not find file or assembly System.Web.Services

1 Answers1