Migrating .NET Core 3.1 to .NET 5.0, AzureFunctions, Cannot convert input parameter 'req' to type 'System.Net.Http.HttpRequestMessage'

user_11530367 0
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I'm in the middle of migrating from .NET Core 3.1 to .NET 5.0 for my Azure Functions project. I have the following function decleration:

using Microsoft.Azure.Functions.Worker;
using Microsoft.Azure.Functions.Worker.Http;
using Microsoft.Extensions.Logging;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net.Http;

[Function("Test")]
public static async Task Run([HttpTrigger(AuthorizationLevel.Anonymous, "get", "post", Route = null)] HttpRequestMessage req, 
    ILogger log, 
    Microsoft.Azure.WebJobs.ExecutionContext context)
{
    ...
}

However, I receive the following error message:

System.Private.CoreLib: Exception while executing function: Functions.SaveBlob. System.Private.CoreLib: Result: Failure
Exception: Microsoft.Azure.Functions.Worker.Diagnostics.Exceptions.FunctionInputConverterException: Error converting 1 input parameters for Function 'Test': Cannot convert input parameter 'req' to type 'System.Net.Http.HttpRequestMessage' from type 'Microsoft.Azure.Functions.Worker.GrpcHttpRequestData'.

I need to keep the ExecutionContext for my application.

How can I fix this error?

.net-5 .net-core-3.1 azure-functions .net c#
1 Answers

After reading the Microsoft Documentation about the Execution Context, I see the class was renamed to FunctionContext

The fix to the issue was simple, rename ExecutionContext to FunctionContext. I realize that the Microsoft.Azure.WebJobs is not needed for .NET 5 Azure Functions. Next, I needed to change the type from System.Net.Http.HttpRequestMessage to Microsoft.Azure.Functions.Worker.Http.HttpRequestData. Lastly, I removed the ILogger in favor of the GetLogger Method.

The final function looks like this.

using System;
using System.IO;
using System.Threading.Tasks;
using Microsoft.Azure.Functions.Worker;
using Microsoft.Azure.Functions.Worker.Http;

[Function("Test")]
public static HttpResponseData Run([HttpTrigger(AuthorizationLevel.Anonymous, "get", "post", Route = null)] HttpRequestData req
        FunctionContext context)
{
    ...
}

When upgrading, be sure to thoroughly read all their documentation about the new changes. It also helped to create a new project through Visual Studio Code using .NET 5 to see how a new project is structured.

user_115303670
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