I can see the [core packages](https://learn.microsoft.com/en-us/azure/azure-functions/dotnet-isolated-process-guide?tabs=hostbuilder,windows#performance-optimizations) of Isolated Azure functions `Microsoft.Azure.Functions.Worker.Sdk` and `Microsoft.AspNetCore.App` are missing in your `.csproj`, refer [MSDOC](https://learn.microsoft.com/en-us/azure/azure-functions/migrate-dotnet-to-isolated-model?tabs=net8) to upgrade the function from in-process to isolated.
1. Install the NuGet packages `Microsoft.Azure.Functions.Worker.Sdk` with version `1.16.4 or later`.
2. Add the framework reference to `Microsoft.AspNetCore.App`.
3. Add `<Nullable>enable</Nullable>` in `.csproj`.
**.csproj of Service Bus trigger .NET 8.0 Isolated Azure function:**
```xml
<Project Sdk="Microsoft.NET.Sdk">
<PropertyGroup>
<TargetFramework>net8.0</TargetFramework>
<AzureFunctionsVersion>v4</AzureFunctionsVersion>
<OutputType>Exe</OutputType>
<ImplicitUsings>enable</ImplicitUsings>
<Nullable>enable</Nullable>
</PropertyGroup>
<ItemGroup>
<FrameworkReference Include="Microsoft.AspNetCore.App" />
<PackageReference Include="Microsoft.Azure.Functions.Worker" Version="2.0.0" />
<PackageReference Include="Microsoft.Azure.Functions.Worker.Extensions.Http.AspNetCore" Version="2.0.0" />
<PackageReference Include="Microsoft.Azure.Functions.Worker.Extensions.ServiceBus" Version="5.22.0" />
<PackageReference Include="Microsoft.Azure.Functions.Worker.Sdk" Version="2.0.0" />
</ItemGroup>
<ItemGroup>
<None Update="host.json">
<CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
</None>
<None Update="local.settings.json">
<CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
<CopyToPublishDirectory>Never</CopyToPublishDirectory>
</None>
</ItemGroup>
<ItemGroup>
<Using Include="System.Threading.ExecutionContext" Alias="ExecutionContext" />
</ItemGroup>
</Project>
```
**local.settings.json:**
```json
{
"IsEncrypted": false,
"Values": {
"AzureWebJobsStorage": "UseDevelopmentStorage=true",
"FUNCTIONS_WORKER_RUNTIME": "dotnet-isolated",
"ServiceBusConnection": "ServiceBus_ConnectionString"
}
}
```
**Code Snippet:**
**Function.cs:**
```csharp
[Function(nameof(Function1))]
public async Task Run(
[ServiceBusTrigger("queue1", Connection = "demo")]
ServiceBusReceivedMessage message,
ServiceBusMessageActions messageActions)
{
_logger.LogInformation("Message ID: {id}", message.MessageId);
_logger.LogInformation("Message Body: {body}", message.Body);
_logger.LogInformation("Message Content-Type: {contentType}", message.ContentType);
await messageActions.CompleteMessageAsync(message);
}
```
**Program.cs:**
```csharp
using Microsoft.Azure.Functions.Worker;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
var host = new HostBuilder()
.ConfigureFunctionsWebApplication()
.ConfigureServices(services =>
{
services.AddApplicationInsightsTelemetryWorkerService();
services.ConfigureFunctionsApplicationInsights();
})
.Build();
host.Run();
```
I have used code mentioned in the [document](https://learn.microsoft.com/en-us/azure/azure-functions/migrate-dotnet-to-isolated-model?tabs=net8#programcs-file) and it worked for me.
Make sure to install `.NET 8.0`, latest `packages` as per requirement and upgrade to latest `Azure Function core tools` for local run from [here](https://learn.microsoft.com/en-us/azure/azure-functions/functions-run-local?tabs=windows,in-process,node-v4,python-v2,http-trigger,container-apps&pivots=programming-language-csharp#install-the-azure-functions-core-tools)
I am using HTTP Trigger
**#My Code:**
**`.csproj`:**
```xml
<Project Sdk="Microsoft.NET.Sdk">
<PropertyGroup>
<TargetFramework>net8.0</TargetFramework>
<AzureFunctionsVersion>v4</AzureFunctionsVersion>
<RootNamespace>My.Namespace</RootNamespace>
<OutputType>Exe</OutputType>
<ImplicitUsings>enable</ImplicitUsings>
<Nullable>enable</Nullable>
</PropertyGroup>
<ItemGroup>
<FrameworkReference Include="Microsoft.AspNetCore.App" />
<PackageReference Include="Microsoft.Azure.Functions.Worker" Version="1.19.0" />
<PackageReference Include="Microsoft.Azure.Functions.Worker.Sdk" Version="1.16.2" />
<PackageReference Include="Microsoft.Azure.Functions.Worker.Extensions.Http.AspNetCore" Version="1.0.0" />
<PackageReference Include="Microsoft.ApplicationInsights.WorkerService" Version="2.21.0" />
<PackageReference Include="Microsoft.Azure.Functions.Worker.ApplicationInsights" Version="1.0.0" />
<!-- Other packages may also be in this list -->
</ItemGroup>
<ItemGroup>
<None Update="host.json">
<CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
</None>
<None Update="local.settings.json">
<CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
<CopyToPublishDirectory>Never</CopyToPublishDirectory>
</None>
</ItemGroup>
<ItemGroup>
<Using Include="System.Threading.ExecutionContext" Alias="ExecutionContext"/>
</ItemGroup>
</Project>
```
**`program.cs`:**
```csharp
using Microsoft.Azure.Functions.Worker;
using Microsoft.Extensions.Hosting;
using Microsoft.Extensions.DependencyInjection;
var host = new HostBuilder()
.ConfigureFunctionsWorkerDefaults()
.ConfigureServices(services => {
services.AddApplicationInsightsTelemetryWorkerService();
services.ConfigureFunctionsApplicationInsights();
})
.Build();
await host.RunAsync();
```
**`HttpTrigger`:**
```csharp
using System.Net;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Azure.Functions.Worker;
using Microsoft.Extensions.Logging;
namespace Company.Function
{
public class HttpTrigger1
{
private readonly ILogger _logger;
public HttpTrigger1(ILoggerFactory loggerFactory)
{
_logger = loggerFactory.CreateLogger<HttpTrigger1>();
}
[Function("HttpTrigger1")]
public IActionResult Run([HttpTrigger(AuthorizationLevel.Anonymous, "get", "post")] HttpRequest req)
{
_logger.LogInformation("C# HTTP trigger function processed a request.");
return new OkObjectResult("Welcome to Azure Function!");
}
}
}
```
**`local.settings.json`:**
```json
{
"IsEncrypted": false,
"Values": {
"AzureWebJobsStorage": "UseDevelopmentStorage=true",
"FUNCTIONS_WORKER_RUNTIME": "dotnet-isolated"
}
}
```
**`OUTPUT`:**
**Azure:**
