Exception when creating SendGridAPIClient

[dannythomas13]

Issue Summary

I get the following exception when attempting to use SendGrid:

An unhandled exception occurred while processing the request.

FileLoadException: Could not load file or assembly 'System.Diagnostics.DiagnosticSource, Version=4.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040)
System.Net.Http.WinHttpHandler..cctor()

TypeInitializationException: The type initializer for 'System.Net.Http.WinHttpHandler' threw an exception.
System.Net.Http.WinHttpHandler..ctor()

Steps to Reproduce

var apiKey = Environment.GetEnvironmentVariable("SENDGRID_APIKEY"); var client = new SendGridClient(apiKey); var from = new EmailAddress("test@example.com", "Example User"); var subject = "Sending with SendGrid is Fun"; var to = new EmailAddress("test@example.com", "Example User"); var plainTextContent = "and easy to do anywhere, even with C#"; var htmlContent = "<strong>and easy to do anywhere, even with C#</strong>"; var msg = MailHelper.CreateSingleEmail(from, to, subject, plainTextContent, htmlContent); var response = await client.SendEmailAsync(msg);

Technical details:

This is from a .net core web application targeting the full framework as follows:
net461

Below are the full package references:

<ItemGroup>
    <PackageReference Include="Microsoft.AspNetCore.Authentication.Cookies" Version="1.1.1" />
    <PackageReference Include="Microsoft.AspNetCore.Diagnostics" Version="1.1.1" />
    <PackageReference Include="Microsoft.AspNetCore.Diagnostics.EntityFrameworkCore" Version="1.1.1" />
    <PackageReference Include="Microsoft.AspNetCore.Identity.EntityFrameworkCore" Version="1.1.1" />
    <PackageReference Include="Microsoft.AspNetCore.Mvc" Version="1.1.2" />
    <PackageReference Include="Microsoft.AspNetCore.Routing" Version="1.1.1" />
    <PackageReference Include="Microsoft.AspNetCore.Server.IISIntegration" Version="1.1.1" />
    <PackageReference Include="Microsoft.AspNetCore.Server.Kestrel" Version="1.1.1" />
    <PackageReference Include="Microsoft.AspNetCore.StaticFiles" Version="1.1.1" />
    <PackageReference Include="Microsoft.EntityFrameworkCore.Design" Version="1.1.1" />
    <PackageReference Include="Microsoft.EntityFrameworkCore.SqlServer" Version="1.1.1" />
    <PackageReference Include="Microsoft.EntityFrameworkCore.SqlServer.Design" Version="1.1.1" />
    <PackageReference Include="Microsoft.EntityFrameworkCore.Tools" Version="1.1.0">
      <PrivateAssets>All</PrivateAssets>
    </PackageReference>
    <PackageReference Include="Microsoft.Extensions.Configuration.EnvironmentVariables" Version="1.1.1" />
    <PackageReference Include="Microsoft.Extensions.Configuration.Json" Version="1.1.1" />
    <PackageReference Include="Microsoft.Extensions.Configuration.UserSecrets" Version="1.1.1" />
    <PackageReference Include="Microsoft.Extensions.Logging" Version="1.1.1" />
    <PackageReference Include="Microsoft.Extensions.FileProviders.Abstractions" Version="1.1.0" />
    <PackageReference Include="Microsoft.Extensions.Logging.Abstractions" Version="1.1.1" />
    <PackageReference Include="Microsoft.Extensions.Logging.AzureAppServices" Version="1.0.1" />
    <PackageReference Include="Microsoft.Extensions.Logging.Console" Version="1.1.1" />
    <PackageReference Include="Microsoft.Extensions.Logging.Debug" Version="1.1.1" />
    <PackageReference Include="Microsoft.Extensions.Options.ConfigurationExtensions" Version="1.1.1" />
    <PackageReference Include="Microsoft.VisualStudio.Web.BrowserLink" Version="1.1.0" />
    <PackageReference Include="Microsoft.VisualStudio.Web.CodeGeneration.Design" Version="1.1.0" />
    <PackageReference Include="AutoMapper" Version="6.0.2" />
    <PackageReference Include="Sendgrid" Version="9.4.1" />
    <PackageReference Include="WindowsAzure.Storage" Version="8.1.1" />
    <PackageReference Include="Microsoft.Extensions.Primitives" Version="1.1.0" />
  </ItemGroup>

  <ItemGroup Condition=" '$(TargetFramework)' == 'net461' ">
    <Reference Include="System.Device" />
    <Reference Include="System.Drawing" />
    <Reference Include="System" />
    <Reference Include="Microsoft.CSharp" />
  </ItemGroup>

[thinkingserious]

Hello @dannythomas13,

What version of Visual Studio are you using and on what OS?

With Best Regards,

Elmer

[dannythomas13]

@thinkingserious thanks for getting back to me, I am using VS2017 Professional on Windows 7 64 bit

[ShurikEv]

I have same problem, but I am using VS2017 Enterprise on Windows 10 64 bit

[thinkingserious]

Thanks for adding your voice to this issue. I've added your vote to this issue in our backlog to help increase its priority.

[dannythomas13]

@ShurikEv I desperately need to be able to send emails from an azure app for a current project if you find another solution before this is resolved can you let me know please?

[thinkingserious]

@dannythomas13 have you tried using the SendGrid addon within Azure?

[Jericho]

@dannythomas13 to work around the problem you are experiencing you could also consider StrongGrid

[thinkingserious]

@Jericho, do have an idea on what the problem could be?

[Jericho]

@thinkingserious just a wild guess: the problem seems to be regarding a missing assembly called System.Diagnostics.DiagnosticSource, so maybe add it to your package?

[thinkingserious]

Thanks @Jericho!

@dannythomas13,

Could you please try adding that assembly to your project to see if that resolves the issue?

Also, I could not replicate this on Visual Studio 2015, so I will get 2017 going to try and replicate there.

Thanks!

[dannythomas13]

@Jericho @thinkingserious difficult for me as when i add reference to 4.0.0 i get lots of warning that i am downgrading from 4.3.0 which is required from all of the 1.1.* asp core libraries

[dannythomas13]

@thinkingserious regarding the azure addon i assumed this is what i had but still needed to code to send messages? I was following this guide:
https://docs.microsoft.com/en-us/azure/app-service-web/sendgrid-dotnet-how-to-send-email
Is this not the correct appraoch?

[Jericho]

A quick google search yields several other people reporting this problem:

• Could not load file or assembly 'System.Diagnostics.DiagnosticSource' canton7/RestEase#28
• Application running on NET461 fails with FileLoadException aspnet/JavaScriptServices#487
• Depending on Microsoft.AspNetCore.Authentication 1.1.0 causes a failure to resolve System.Net.Http when targeting the full framework. aspnet/Security#1046
• https://stackoverflow.com/questions/42674661/could-not-load-file-or-assembly-system-diagnostics-diagnosticsource-on-asp-net

[thinkingserious]

Thanks @Jericho!

It looks like the fix is to reference System.Net.Http 4.3.1. I'll give it a try.

[thinkingserious]

@dannythomas13,

That is the correct approach; however, it looks like we have to fix some dependency issues for VS 2017 Core 1.1.* projects.

[dannythomas13]

@thinkingserious is this something that could be done within the next few weeks? If not is there a workaround?

[thinkingserious]

Hi @dannythomas13,

It could be done within the next few weeks if we get a significant amount of people voting on this issue or best if someone submits a PR. Those things help push the item up our backlog queue.

[dannythomas13]

@thinkingserious Did this issue make the next release? :)

[thinkingserious]

Hi @dannythomas13,

Unfortunately, this issue is still fairly low on our backlog. It can gain momentum with additional votes or a PR.

Thanks for checking in!

With Best Regards,

Elmer

[dannythomas13]

Hi Elmer, do you have a public facing backlog so I can keep an eye on the priority of this issue please?

[thinkingserious]

Hi @dannythomas13,

We do not right now, but I'm going to discuss this with my product manager today and see if we can come up with a better way to inform on our progress.

With Best Regards,

Elmer

[thinkingserious]

Since there has been no activity on this issue since March 1, 2020, we are closing this issue. Please feel free to reopen or create a new issue if you still require assistance. Thank you!