System.InvalidOperationException: The gRPC channel URI 'http://0' could not be parsed

Question

Using .NET5 Azure function in Visual Studio 2019, I am getting the below exception from Program.cs:

System.InvalidOperationException: The gRPC channel URI 'http://0' could not be parsed

My Program.cs is below:

public static void Main()
{
    var host = new HostBuilder()
            .ConfigureFunctionsWorkerDefaults()
            .ConfigureServices(services =>
            {
                services.AddSingleton<IConfiguration>(data =>
                {
                    var result = new ConfigurationBuilder()
                        .SetBasePath(Directory.GetCurrentDirectory())
                        .AddJsonFile("AppSettings.json", false, true)
                        .AddJsonFile($"AppSettings.{Environment.GetEnvironmentVariable("ASPNETCORE_ENVIRONMENT") ?? "Production"}.json", true)
                        .AddEnvironmentVariables()
                        .Build();
                    return result;
                });

                services.AddSingleton<IServiceProvider, ServiceProvider>();
            })
            .UseDefaultServiceProvider(options => options.ValidateScopes = false)
            .Build();

    host.Run();
}

The exception is being thrown from host.Run() in Debug mode. Any clue?

Hello @Yeasin Abedin, Could you please try to run your function by using this command `func host start` in [Azure Functions Core Tools](https://github.com/Azure/azure-functions-dotnet-worker#install-the-azure-functions-core-tools) ,as mentioned in this SO Thread :https://stackoverflow.com/questions/67013422/upgrading-azure-functions-to-5-0-system-uriformatexception , And please let me know if it works or if the same issue still happening. — AjayKumarGhose, Nov 22 '21 at 09:40
Please check my answer. I didn't have to use Azure Function Core Tools. — Yeasin Abedin, Nov 23 '21 at 08:44

score 25 · Answer 1 · edited May 25 '22 at 05:17

25

For me it was occurring in Rider. The issue was that I was running the Function App as a .Net Project instead of as Azure Functions host.

edited May 25 '22 at 05:17

Suraj Rao

29,388
11
94
103

answered May 25 '22 at 04:43

ubienewbie

1,771
17
31

You need the plugin https://plugins.jetbrains.com/plugin/11220-azure-toolkit-for-rider – Michael Blake Aug 05 '22 at 08:58
How exactly did you run as Function App? Which steps did you follow? Could you please elaborate on that? – Serhat Jan 27 '23 at 12:38
@Serhat, I agree that this is the correct answer and that it's not descriptive enough, so I'll answer. Rider (three lines menu) -> Run -> Edit Configurations. You'll see items in the .net projects. Select them and click the minus. Select the Azure functions host. Click the plus. Select the project that is your function app. Give it a name. In my case the name was in conflict so I gave it a new name, but then had to close rider, delete the .idea folder and restart rider. Once I went back into the run configuration, I was able to rename the configuration correctly. – Dave Loukola Feb 23 '23 at 15:25

score 10 · Accepted Answer · answered Nov 23 '21 at 08:42

My issue has been solved. Once I set the IConfiguration from ConfigureAppConfiguratio middleware, the exception is gone

public static void Main()
{
    var host = new HostBuilder()
                    .ConfigureFunctionsWorkerDefaults()
                    .ConfigureAppConfiguration(config =>
                    {
                        config.SetBasePath(Directory.GetCurrentDirectory())
                            .AddJsonFile("AppSettings.json", false, true)
                            .AddJsonFile(
                                $"AppSettings.{Environment.GetEnvironmentVariable("ASPNETCORE_ENVIRONMENT") ?? "Production"}.json",
                                true)
                            .AddEnvironmentVariables();
                    })
                    .ConfigureServices(services =>
                    {
                        
                    })
                    .UseDefaultServiceProvider(options => options.ValidateScopes = false)
                    .Build();

            host.Run();
}

`error CS0106: The modifier 'public' is not valid for this item [/private/tmp/foo/LocalFunctionProj/LocalFunctionProj.csproj]` — Brandon Ros, Sep 12 '22 at 17:28
Came accross this when upgrading from .NET 6 to .NET 7. This was 100% the issue. — UnreliableWitness, Jul 11 '23 at 10:44

score 5 · Answer 3 · answered Nov 25 '22 at 12:36

5

In my case, shutting down Visual Studio 2022 and opening it in Administrator mode solved my issue

answered Nov 25 '22 at 12:36

Pau 24

93
1
4

score 3 · Answer 4 · answered Jan 12 '23 at 14:20

3

I was having the same problem in VS 2022, .NET 7. Adding the nuget package for

Microsoft.Azure.Functions.Worker.Sdk

solved this for me.

answered Jan 12 '23 at 14:20

Tom

61
1
5

Solved my issue as well with a function I was migration from .Net 6 to .Net 7. – Dennis Kiesel Mar 02 '23 at 00:10

score 0 · Answer 5 · edited Aug 11 '23 at 00:45

I had a similar issue and I found out that the problem was caused by the services.AddConfigurations method in the ConfigureServices extension method. This method was overriding the settings done by the ConfigureFunctionsWorkerDefaults() method. To fix this, I had to include the hostContext.Configuration in the AddConfigurations() method, like this:

var host = new HostBuilder()
.ConfigureFunctionsWorkerDefaults()
.ConfigureServices((hostContext, services) =>
{
    var location = Path.GetDirectoryName(Assembly.GetEntryAssembly().Location);

    services.AddConfigurations(c => c.SetBasePath(location)
                        .AddJsonFile("example.settings.json", optional: false, reloadOnChange: true)
                        .AddConfiguration(hostContext.Configuration));
}).Build();
host.Run();

This way, the configuration from the hostContext is merged with the configuration from the JSON file, and the settings are not overridden. I hope this helps you solve your problem.

System.InvalidOperationException: The gRPC channel URI 'http://0' could not be parsed

5 Answers5

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