Disable Property of Azure Functions not working in Visual Studio 2017

Question

I have Azure function with timer trigger.

public static void Run([TimerTrigger("0 */15 * * * *"), Disable("True")]TimerInfo myTimer, TraceWriter log)

Here the Disable("true") is not working. it generates the function.json as "disabled": "True", which is not correct. It should be "disabled": True, Disable only accepts string value. Is there any way to change this? or any other way to disable function?

Answer 1

Disable properties default values is true.

Use Disable() instead of Disable("true").

So the code will look like

public static void Run([TimerTrigger("0 */15 * * * *"), Disable()]TimerInfo myTimer, TraceWriter log) .

If you want to enable the function use Disable("False").

Answer 2

Have you tried modifying the host.json inside your solution? It has the following properties for you to specify which functions to load on runtime.

// Array of functions to load. Only functions in this list will be enabled.
// If not specified, all functions are enabled.
"functions": ["QueueProcessor", "GitHubWebHook"]

Note that if you have multiple Function App projects in your solution, you will also need to make to change to their corresponding host.json (i.e. each project has their own host.json)

Documentation: https://github.com/Azure/azure-webjobs-sdk-script/wiki/host.json

Answer 3

The string typed value - "disabled": "true" also could disable the function. Please see the test result as following.

Here is my function definition.

public static void Run([TimerTrigger("0 */5 * * * *"),Disable("true")]TimerInfo myTimer, TraceWriter log)

Here is the published function on Azure portal.

Answer 4

Functions 2.x can be disabled individually via local.settings.json in the following manner

{
    "IsEncrypted": false,
    "Values": {
    "AzureWebJobs.MyFunctionNameOne.Disabled": "true",
    "AzureWebJobs.MyFunctionNameTwo.Disabled": "true",
    ...
    }
}

Ref: https://docs.microsoft.com/en-us/azure/azure-functions/disable-function#functions-2x---all-languages

Answer 5

I tried disabling using local.settings.json, and when debugging locally the emulator window actually says that the named function is disabled, but calls it anyway! This is the same in VS2017 and 2019.

The workaround I'm currently using is to test for this app setting as the first line in my function and return immediately:

    if(ConfigurationManager.AppSettings["AzureWebJobs.TimerTriggeredFunction.Disabled"] == "true") return;