Microsoft.Azure.WebJobs.Host: Cannot bind parameter ‘name’ to type String

In this azure tutorial, we will discuss how to fix the error, Microsoft.Azure.WebJobs.Host: Cannot bind parameter ‘name’ to type String. This error I got while running an Azure function using the Visual Studio 2019 in my local machine.

Microsoft.Azure.WebJobs.Host: Cannot bind parameter ‘name’ to type String

Recently, I was trying to run my HTTP triggered Azure Function, I got the error Microsoft.Azure.WebJobs.Host: Cannot bind parameter ‘name’ to type String.

Below was my HTTP triggered Azure Function code

public static class Function1
    {
        [FunctionName("HTTPAzureFunction")]
        public static async Task<IActionResult> Run(
            [HttpTrigger(AuthorizationLevel.Anonymous, "get", "post", Route = null )] HttpRequest req, string name, ILogger log)
        {
            log.LogInformation("C# HTTP trigger function processed a request.");

            string name1 = req.Query["name"];

            string requestBody = await new StreamReader(req.Body).ReadToEndAsync();
            dynamic data = JsonConvert.DeserializeObject(requestBody);
            name = name ?? data?.name;

            string responseMessage = string.IsNullOrEmpty(name)
                ? "This HTTP triggered function executed successfully. Pass a name in the query string or in the request body for a personalized response."
                : $"Hello, {name}. This HTTP triggered function executed successfully.";

            return new OkObjectResult(responseMessage);
        }
    }
}
Microsoft.Azure.WebJobs.Host: Cannot bind parameter 'name' to type String

After running the above function, i got the above error. The exact error message was as below

The ‘HTTPAzureFunction’ function is in error: Microsoft.Azure.WebJobs.Host: Error indexing method ‘HTTPAzureFunction’. Microsoft.Azure.WebJobs.Host: Cannot bind parameter ‘name’ to type String. Make sure the parameter Type is supported by the binding. If you’re using binding extensions (e.g. Azure Storage, ServiceBus, Timers, etc.) make sure you’ve called the registration method for the extension(s) in your startup code (e.g. builder.AddAzureStorage(), builder.AddServiceBus(), builder.AddTimers(), etc.).

The function is in error: Microsoft.Azure.WebJobs.Host: Error indexing method. Microsoft.Azure.WebJobs.Host: Cannot bind parameter ‘name’ to type String.

Microsoft.Azure.WebJobs.Host: Error indexing method

‘HTTPAzureFunction’ is the name of my Azure function.

Now, to fix the above error, I have tried a couple of ways but nothing worked out in my case. Even I tried adding a few classes from the Nuget package.

Microsoft.Azure.WebJobs.Host: Cannot bind parameter ‘name’ to type String [Solved]

Now, the issue was I have added the string name parameter in my Azure HTTP triggered function while working with Azure Function HTTP Trigger Route functionality. Now it fixed my issue after I removed the parameter string name from my Azure Function. You can see below

microsoft azure-webjobs host indexers functionindexingexception error indexing method

Now I removed the string name parameter from my Azure function

microsoft.azure.webjobs.host error indexing method cannot bind parameter

Now i ran the Azure Function project and it executed with out any issue. Refer to the below screen shot.

make sure the parameter type is supported by the binding. if you're using binding extensions

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Conclusion

In this article, we have discussed how to fix the error Microsoft.Azure.WebJobs.Host: Cannot bind parameter ‘name’ to type String or The function is in error: Microsoft.Azure.WebJobs.Host: Error indexing method. Microsoft.Azure.WebJobs.Host: Cannot bind parameter ‘name’ to type String. Hope it will help you to fix your issue!!!.

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