Azure Functions - ICollector 绑定未生成 function.json

Question

我有以下 C# 函数代码：

[FunctionName("UpdateCohortsByTenantFunction")]
[return: Queue("my-queue", Connection = "MyStorage")]
//note - I have tried both method decoration and parameter decoration
public static async Task Run([TimerTrigger("* * * * * *")]TimerInfo myTimer, IAsyncCollector<AudienceMessage> output)
{
    //some logic
    foreach (var audience in audiences)
    {
        await output.AddAsync(new AudienceMessage
        {
            AudienceId = audience.Id,
            TenantId = tenant.Id
        });
    }
}

产生以下 function.json:

{
   "generatedBy": "Microsoft.NET.Sdk.Functions.Generator-1.0.6",
   "configurationSource": "attributes",
   "bindings": [
   {
       "type": "timerTrigger",
       "schedule": "* * * * * *",
       "useMonitor": true,
       "runOnStartup": false,
       "name": "myTimer"
   }
  ],
  "disabled": false,
  "scriptFile": "../bin/MyApp.App.Tasks.Functions.dll",
  "entryPoint": "MyApp.App.Tasks.Functions.UpdateCohortsByTenantFunction.Run"
}

根据文档 here，json 输出应该包含一个绑定到我的队列的 "out" 方向。即：

{
  "type": "queue",
  "direction": "out",
  "name": "$return",
  "queueName": "outqueue",
  "connection": "MyStorageConnectionAppSetting",
}

当我尝试通过 npm 工具运行队列时（配置描述），我收到以下错误：

Run: Microsoft.Azure.WebJobs.Host: Error indexing method 'UpdateCohortsByTenantFunction.Run'. Microsoft.Azure.WebJobs.Host: Cannot bind parameter 'output' to type IAsyncCollector`1. Make sure the parameter Type is supported by the binding. If you're using binding extensions (e.g. ServiceBus, Timers, etc.) make sure you've called the registration method for the extension(s) in your startup code (e.g. config.UseServiceBus(), config.UseTimers(), etc.).

文档中没有提及通过启动代码进行绑定。我的理解是，这是通过上面链接的 Microsoft 文档和我的示例代码中描述的属性完成的，但错误消息表明并非如此。

Answer 1

你应该用属性修饰你的参数，而不是 return 值：

public static async Task Run(
    [TimerTrigger("* * * * * *")]TimerInfo myTimer,
    [Queue("my-queue", Connection = "MyStg")] IAsyncCollector<AudienceMessage> output)

预计 function.json 中没有输出绑定。属性定义的绑定不会传输到生成的 function.json。它们仍然会起作用，别担心。

Azure Functions - ICollector 绑定未生成 function.json

Azure Functions - ICollector binding not in resulting function.json

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