对于通过IoC进行的非功能方法，ExecutionContext为null，替代ExecutionContext.FunctionAppDirectory [英] ExecutionContext is null to non-function methods via IoC, alternative to ExecutionContext.FunctionAppDirectory

问题描述

ExecutionContext可用于功能参数.

ExecutionContext is available to functon parameters.

但是，它不能通过依赖项注入用于其他方法，包括Function的构造函数，如下所示:

However, it is not available to other methods via dependency inject, including Functions' constructor, like below:

    public class FunctionClass
    {   

        IOtherClass _otherclass;
       public FunctionClass(ExecutionContext  context,  //excetpion
                          IOtherClass otherclass)  //excetpion
       {
                 _otherclass = IOtherClass otherclass
       }

     [FunctionName("Car")]
        public async Task<IActionResult> Run(
        [HttpTrigger(AuthorizationLevel.Anonymous, "get", "post", Route = null)]
        HttpRequest req, ExecutionContext  context)
        {     
          }
    }

     public class OtherClass:IOtherClass
    {   
       public OtherClass(ExecutionContext  context)  //excetpion
       {}
    }

我需要访问ExecutionContext.FunctionAppDirectory，但不想传递ExecutionContext，因为想改用IoC.

I need access to ExecutionContext.FunctionAppDirectory, but don't want to pass ExecutionContext around, because want to use IoC instead.

是否有另一种方法来获取ExecutionContext.FunctionAppDirectory的值?

Is there an alternative way to get the value of ExecutionContext.FunctionAppDirectory?

VS 2017

Azure Functons 2.x

Azure Functons 2.x

推荐答案

基于当前文档，ExecutionContext仅在调用函数方法时在请求范围内可用.

Based on current documentation, ExecutionContext is only available in the scope of a request when the function method is being invoked.

[FunctionName("Car")]
public async Task<IActionResult> Run(
    [HttpTrigger(AuthorizationLevel.Anonymous, "get", "post", Route = null)]
    HttpRequest req, 
    ExecutionContext context //<--
) {

    var path = context.FunctionAppDirectory;

    //...
}

初始化函数类时，它在注入的构造函数中尚不可用.

It wont be available as yet in the constructor for injection when the function class is initialized.

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