使用带有属性的预编译 C# 时，是否可以在 Azure 函数中进行多个输出绑定？

Question

使用带有属性的预编译 C# 函数时，是否可以在 Azure 函数中进行多个输出绑定？

例如一个函数在 HTTP 请求上触发，并且该函数既响应 HTTP 响应又响应 table 存储

编辑：目标错误，它是 HTTP 和 Cosmos DB 集合的文档

Answer 1

是的，下面的代码片段展示了这个例子：

#r "Newtonsoft.Json"
#r "Microsoft.WindowsAzure.Storage"

using System.Net;
using Newtonsoft.Json;
using System.Threading.Tasks;
using Microsoft.WindowsAzure.Storage.Table;

public static async Task<HttpResponseMessage> Run(HttpRequestMessage req, CloudTable table, TraceWriter log)
{
    log.Info("C# HTTP trigger function processed a request.");

    // parse query parameter
    string name = req.GetQueryNameValuePairs()
        .FirstOrDefault(q => string.Compare(q.Key, "name", true) == 0)
        .Value;

    // Get request body
    dynamic data = await req.Content.ReadAsAsync<object>();

    // Set name to query string or body data
    name = name ?? data?.name;

    // insert to the table
    table.ExecuteAsync(TableOperation.Insert(new Request {PartitionKey=name, RowKey=Guid.NewGuid().ToString(), Body = JsonConvert.SerializeObject(data) }));

    return name == null
        ? req.CreateResponse(HttpStatusCode.BadRequest, "Please pass a name on the query string or in the request body")
        : req.CreateResponse(HttpStatusCode.OK, "Hello " + name);
}

public class Request : TableEntity
{
    public string Body { get; set; }
}

和绑定：

{
  "bindings": [
    {
      "authLevel": "function",
      "name": "req",
      "type": "httpTrigger",
      "direction": "in"
    },
    {
      "name": "$return",
      "type": "http",
      "direction": "out"
    },
    {
      "name": "table",
      "type": "table",
      "connection": "myStorage",
      "tableName": "myTable",
      "direction": "out"
    }
  ],
  "disabled": false
}

Answer 2

虽然完全可以在单个函数中执行此操作，但您可能还想查看 Durable Functions Fan-In/Out mechanism。

你最终会得到多个小的函数。各司其职。

Answer 3

这是一个带有两个输出绑定的函数的简单示例，使用最新的 VS2017 预览工具实现：

[FunctionName("MultipleOutBindings")]
public static HttpResponseMessage MultipleOutBindings(
    [HttpTrigger(AuthorizationLevel.Function, "post")] HttpRequestMessage req,
    [Queue("out-queue")] out string queueItem)
{
    queueItem = "My new queue message";
    return req.CreateResponse(HttpStatusCode.OK, "Hello");
}

使用带有属性的预编译 C# 时，是否可以在 Azure 函数中进行多个输出绑定？

Is it possible to have multiple out bindings in an Azure function when using the pre-compiled C# with attributes?

azure

azure-functions