Logic Apps inline C# script step just stopped working with no code change

Question

Last 10 entries (specifically all those in last 4 days) show as failed in Run History and have this message in the "Execute CSharp Script Code" action

InvokeFunctionFailed

The function 'CSharp_receive-email-test_execute_csharp_script_code.csx' failed with the error 'Exception binding parameter 'context'' when executing. Please verify function code is valid.

Again, no code was changed. And I can't make sense of that error.

Was there a breaking change made to Logic Apps inline C#?

Edit: there certainly was a breaking change.

Steps to reproduce:

In designer, add a "Execute CSharp Script Code" step
Copy the code sample from https://learn.microsoft.com/en-us/azure/logic-apps/add-run-csharp-scripts
Run the workflow. It works
Add to the script this statement: using System.Text.Json;

The error now occurs.

Edit: 5/5/25: The breaking change in was that a reference is now needed to use System.Text.Json

#r "System.Text.Json"

Could you please share your code or some reproductible issue? — Thomas
– Thomas, Commented May 2 at 5:24
Not sure if system.text.json is supported. Also this feature is in preview so prob better to post on GitHub to the MS team ? — Thomas
– Thomas, Commented May 2 at 22:22
the sample is using Newtonsoft.Json not system.text.json . have you tried using Newtonsoft.Json only? — Thomas
– Thomas, Commented May 2 at 22:42

RithwikBojja · Accepted Answer · 2025-05-05 05:36:11Z

1

You can use below sample code and designwhich works fine for me:

You also need to add #r "System.Text.Json":

#r "System.Text.Json"
#r "Microsoft.Azure.Workflows.Scripting"
using Microsoft.AspNetCore.Mvc;
using Microsoft.Extensions.Primitives;
using Microsoft.Extensions.Logging;
using Microsoft.Azure.Workflows.Scripting;
using System.Text.Json;

public static async Task<Riouts> Run(WorkflowContext context, ILogger log)
{
  var testjson = JsonSerializer.Serialize(new { name = "Rithwik" });
  var rijsonobj = JsonSerializer.Deserialize<JsonElement>(testjson);
  var test = rijsonobj.GetProperty("name").GetString();

  return new Riouts
  {
    Peru = test 
  };
}
public class Riouts
{
  public string Peru { get; set; }
}

Output:

answered May 5 at 5:36

RithwikBojja

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5 Comments

Chris Harrington May 5 at 17:00

Still get error when I add other needed namespaces: using System.Linq; using System.IO; using System.Text; using System.Text.Json; using System.Text.Json.Nodes; using System.Text.Encodings.Web; using System.Xml; using System.Xml.Linq; using System.Net; using System.Net.Http; using System.Net.Http.Headers;

RithwikBojja May 5 at 17:11

Open a new question for that, as different namespaces need different packages. Community will help. The initial question was about only one package

Chris Harrington May 6 at 13:08

I observe in the trace that the C# no longer compiles. Which leads to the conclusion that the version of .NET and C# being used by the script runner has changed. How can I determine the version of C# that the "Execute CSharp Script Code" action uses?

RithwikBojja May 6 at 16:31

The c# version is Rolled back to 8.

Bogdan May 14 at 14:37

Can someone please post a link to where this rollback is announced?

Chris Harrington · Accepted Answer · 2025-05-06 16:41:46Z

0

Trying to add references was a distraction and didn't resolve the issue.

The breaking change made on April 28th was that the version of C# used by script actions was rolled back from 11 to 8. Our code uses Raw String Literals (among other things), which is not supported in C# 8.

https://learn.microsoft.com/en-us/dotnet/csharp/language-reference/tokens/raw-string

answered May 6 at 16:41

Chris Harrington

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