CODEWITHSUNDEEP
c#visual-studiocsvhelper
user42108
user42108

Reputation: 201

Could not load file or assembly 'CsvHelper' (C#, VS2019, CSVHelper)

I have a class library which uses CSVHelper (v19.0.0). I installed CSVHelper via Nuget in VS2019 (Version 16.5.5; .NET 4.8.03752), and can confirm that the package is where it 'should' be (based on checking my project/dependencies/package/CSVHelper/properties, which shows C:\Users\[my_name]\.nuget\packages\csvhelper\19.0.0). [EDIT: I have checked my [solution name].csproj file and see that contains PackageReference Include="CsvHelper" Version="19.0.0"]

However, when I try to call one of the methods in my class library, I get the error message shown below.

I have Googled this and others encountered the same problem with earlier versions of CSVHelper (e.g. https://github.com/JoshClose/CsvHelper/issues/944) but their solutions have not worked for me. I have tried: 1) cleaning and rebuilding the solution; 2) removing CSVHelper then reinstalling via Nuget; and 3) removing all old versions of CSVHelper from the .nuget folder on my C drive. The problem continues to appear. Help would be much appreciated.

System.IO.FileNotFoundException
  HResult=0x80070002
  Message=Could not load file or assembly 'CsvHelper, Version=19.0.0.0, Culture=neutral, PublicKeyToken=8c4959082be5c823' or one of its dependencies. The system cannot find the file specified.

Upvotes: 3

Views: 6535

Answers (3)

Omar AMEZOUG
Omar AMEZOUG

Reputation: 998

I had a similar problem while using impersonation and what worked for me is to add assembly like that :

using (WindowsLogin wi = new WindowsLogin(_options.UserName, _options.Domain, _options.Password))
{
     Assembly.Load("CsvHelper, Version=27.0.0.0, Culture=neutral, PublicKeyToken=8c4959082be5c823");
     WindowsIdentity.RunImpersonated(wi.Identity.AccessToken, () =>
     {
               your code goes here ...
                    
     });
}

Upvotes: 0

mikeytown2
mikeytown2

Reputation: 1764

We fixed this by copying over the *.deps.json file which we normally don't do. Also the CsvHelper.dll file's modified timestamp is in the past.

Upvotes: 0

user42108
user42108

Reputation: 201

I'm going to answer my own question rather than delete it, in the hope that it helps someone else.

I "fixed" this by:

  1. manually copying the CsvHelper.dll to the bin\Debug\netstandard2.0 folder for my project
  2. adding a reference directly to that dll
  3. removing the Nuget reference to CsvHelper

Upvotes: 5

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