ApiHubFile Azure 函数绑定的动态输出文件名（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
}

虽然失败了，

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

要在函数执行期间完全控制输出的名称和路径，您需要使用 imperative binding

例如：function.json

{
      "type": "blob",
      "name": "outputBinder",
      "path": "export/test",
      "connection": "AzureWebJobsStorage",
      "direction": "out"
},

函数：

public static async Task<HttpResponseMessage> Run(HttpRequestMessage req, TraceWriter log, IBinder outputBinder)
{
     var attribute new BlobAttribute($"{some dynamic path}/{some dynamic filename}", FileAccess.Write);
     using (var stream = await outputBinder.BindAsync<Stream>(attribute))
     {
          // do whatever you want with this stream here...
     }
}

Answer 2

以下是您的操作方法：

#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);
}

和 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。我们会修复那个错误。

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

Dynamic output file name of ApiHubFile Azure Function binding (one drive, drop box etc)

c#

azure

azure-functions