c# - ApiHubFile Azure Function 绑定(bind)的动态输出文件名(一个驱动器、投递箱等)

Question

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。

我的函数代码:

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

和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
}

但这失败了，

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.).

Answer 1

以下是您可以执行的操作:

#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);
}

以及 function.json 文件:

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

您实际上不应该在 function.json 中需要 apiHubFile 声明，但由于我今天注意到的一个错误，它应该仍然存在。我们将修复该错误。