ApiHubFile Azure 函数绑定的动态输出文件名(一个驱动器，投递箱等)

问题描述

我有一个带有计时器触发器的 Azure 函数，然后我想生成一个具有动态(在运行时定义)名称和内容的文件并将其保存到例如OneDrive.

I have an Azure Function with Timer Trigger, and then I want to generate a file with dynamic (defined in runtime) name and contents and save it to e.g. OneDrive.

我的功能码:

public static void Run(TimerInfo myTimer, out string filename, out string content)
{
    filename = $"{DateTime.Now}.txt";
    content = $"Generated at {DateTime.Now} by Azure Functions";
}

还有function.json:

{
  "bindings": [
    {
      "name": "myTimer",
      "type": "timerTrigger",
      "direction": "in",
      "schedule": "0 */5 * * * *"
    },
    {
      "type": "apiHubFile",
      "name": "content",
      "path": "{filename}",
      "connection": "onedrive_ONEDRIVE",
      "direction": "out"
    }
  ],
  "disabled": false
}

虽然失败了，但

Error indexing method 'Functions.TimerTriggerCSharp1'. Microsoft.Azure.WebJobs.Host:
Cannot bind parameter 'filename' to type String&. 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.).

推荐答案

你可以这样做:

#r "Microsoft.Azure.WebJobs.Extensions.ApiHub"

using System;
using System.IO;
using Microsoft.Azure.WebJobs;
using Microsoft.Azure.WebJobs.Host.Bindings.Runtime;

public static async Task Run(TimerInfo myTimer, TraceWriter log, Binder binder)
{
    log.Info($"C# Timer trigger function executed at: {DateTime.Now}");

    var fileName = "mypath/" + DateTime.Now.ToString("yyyy-MM-ddThh-mm-ss") + ".txt";

    var attributes = new Attribute[]
    {
        new ApiHubFileAttribute("onedrive_ONEDRIVE", fileName, FileAccess.Write)
    };


    var writer = await binder.BindAsync<TextWriter>(attributes);
    var content = $"Generated at {DateTime.Now} by Azure Functions";

    writer.Write(content);
}

还有function.json文件:

    {
  "bindings": [
    {
      "name": "myTimer",
      "type": "timerTrigger",
      "direction": "in",
      "schedule": "10 * * * * *"
    },
    {
      "type": "apiHubFile",
      "name": "outputFile",
      "connection": "onedrive_ONEDRIVE",
      "direction": "out"
    }
  ],
  "disabled": false
}

您实际上并不需要 function.json 中的 apiHubFile 声明，但由于我今天注意到的一个错误，它应该仍然存在.我们会修复这个错误.

You shouldn't really need the apiHubFile declaration in your function.json but because of a bug I noticed today it should still be there. we will fix that bug.

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