我正在尝试编写作为多租户工作的Azure函数。当clientId作为参数来自客户端时，我需要使用标签从Azure应用配置中提取其配置。
让我用伪代码来解释
我使用的是.Net 6 Azure函数隔离。我在Program.cs中进行了配置，如下面的代码所示;

new HostBuilder()
.ConfigureAppConfiguration(builder =>
{
    string cs = "connection-string"; //which is actually comes from environment veriable
    builder.AddAzureAppConfiguration(options =>
    {
        options.Connect(cs);
        //options.Select(KeyFilter.Any, Environment.GetEnvironmentVariable("ClientId")); //It works that way, but I don't want to do it. I need to read the clientId while I receive the request
    });
})

假设我们创建了一个中间件，发出了一个请求

public RequestMiddleware(){
   //Here I need to inject some service
}

//Invoke method of middleware
public async Task Invoke(FunctionContext context, FunctionExecutionDelegate next){
  HttpRequestData requestData = await context.GetHttpRequestDataAsync();
  requestData.Headers.TryGetValues("client-id", out var clientId);
  var id = clientId.First();
  //And here, I need to configure App Configuration to use the id as a label. As I did in the Program.cs
 //like this ; options.Select(KeyFilter.Any, id);
}

是否可以在请求生命周期中按标签加载配置？请记住，标准层中的Azure应用配置对请求有限制，即每小时3000个请求。这就是为什么每次加载AppConfiguration不是一个好主意。