F＃Azure Function的Cosmos DB绑定无法绑定

我正在尝试在F＃中创建一个具有HTTP触发器并从Cosmos DB检索数据的Azure函数。该文档仅提供CosmosDB绑定的C＃示例，并且翻译代码会导致错误Cannot bind parameter 'toDoItems' to type IEnumerable`1

这个C＃示例能够记录Cosmos中各项的ID：

using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Azure.WebJobs;
using Microsoft.Azure.WebJobs.Extensions.Http;
using Microsoft.Azure.WebJobs.Host;
using System.Collections.Generic;
using Microsoft.Extensions.Logging;

namespace Customer
{
    public class ToDoItem
    {
        public string Id { get; set; }
        public string PartitionKey { get; set; }
        public string Description { get; set; }
    }

    public static class DocByIdFromQueryString
    {
        [FunctionName("Triggered")]
        public static IActionResult Run(
            [HttpTrigger(
                AuthorizationLevel.Anonymous,
                "get",
                Route = null
            )] HttpRequest req,
            [CosmosDB(
                databaseName: "customer-db",
                collectionName: "todo-collection",
                ConnectionStringSetting = "CosmosDBConnection",
                SqlQuery = "select * from c"
            )] IEnumerable<ToDoItem> toDoItems, ILogger log)
        {
            log.LogInformation("C# HTTP trigger function processed a request.");

            foreach (ToDoItem toDoItem in toDoItems)
            {
                log.LogInformation(toDoItem.Id);
            }
            return new OkResult();
        }
    }
}

这是来自有效C＃代码的F＃转换。这两个示例具有相同的依赖关系版本，并使用相同的数据库（和连接字符串）。

namespace Customer

open Microsoft.AspNetCore.Http
open Microsoft.AspNetCore.Mvc
open Microsoft.Azure.WebJobs
open Microsoft.Azure.WebJobs.Extensions.Http
open Microsoft.Extensions.Logging


module CosmosBindings =
    type ToDoItem = {
        Id : string
        PartitionKey : string
        Description : string
    }

    [<FunctionName("HttpTrigger")>]
    let Run([<HttpTrigger(
                AuthorizationLevel.Anonymous,
                "get",
                Route = null
            )>] req: HttpRequest,
            [<CosmosDB(
                databaseName = "customer-db",
                collectionName = "todo-collection",
                ConnectionStringSetting = "CosmosDBConnection",
                SqlQuery = "select * from c"
            )>] toDoItems: ToDoItem seq) (log: ILogger) =
                log.LogInformation "F# HTTP trigger function processed a request."

                toDoItems
                |> Seq.iter (fun item -> log.LogInformation item.Id)

                OkObjectResult("Hello")

我试过在function.json文件中指定绑定，但是无论在那里添加什么，bin / HttpTrigger / function.json中的文件仅包含HttpTrigger（C＃和F＃）：

{
  "generatedBy": "Microsoft.NET.Sdk.Functions-3.0.1",
  "configurationSource": "attributes",
  "bindings": [
    {
      "type": "httpTrigger",
      "methods": [
        "get"
      ],
      "authLevel": "anonymous",
      "name": "req"
    }
  ],
  "disabled": false,
  "scriptFile": "../bin/Customer.dll",
  "entryPoint": "Customer.CosmosBindings.Run"
}

C＃和F＃的依赖项和函数版本相同：

<Project Sdk="Microsoft.NET.Sdk">
  <PropertyGroup>
    <TargetFramework>netcoreapp3.0</TargetFramework>
    <AzureFunctionsVersion>v3</AzureFunctionsVersion>
  </PropertyGroup>
  <ItemGroup>
    <PackageReference Include="Microsoft.Azure.WebJobs.Extensions.CosmosDB" Version="3.0.3" />
    <PackageReference Include="Microsoft.NET.Sdk.Functions" Version="3.0.1" />
  </ItemGroup>
  <ItemGroup>
    <Compile Include="GetCustomer.fs" />
  </ItemGroup>
  <ItemGroup>
    <None Update="host.json">
      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
    </None>
    <None Update="local.settings.json">
      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
      <CopyToPublishDirectory>Never</CopyToPublishDirectory>
    </None>
  </ItemGroup>
</Project>

运行F＃示例的错误：

[2/19/2020 4:01:52 PM] Starting JobHost
[2/19/2020 4:01:52 PM] Starting Host (HostId=havardandaestensenvippsnosmacboo, InstanceId=faf11b1c-b81d-49d2-8876-e4ef8785dc9f, Version=3.0.13107, ProcessId=30665, AppDomainId=1, InDebugMode=False, InDiagnosticMode=False, FunctionsExtensionVersion=(null))
[2/19/2020 4:01:52 PM] Loading functions metadata
[2/19/2020 4:01:52 PM] 1 functions loaded
[2/19/2020 4:01:52 PM] Generating 1 job function(s)
[2/19/2020 4:01:52 PM] Microsoft.Azure.WebJobs.Host: Error indexing method 'HttpTrigger'. Microsoft.Azure.WebJobs.Host: Cannot bind parameter 'toDoItems' to type IEnumerable`1. Make sure the parameter Type is supported by the binding. If you're using binding extensions (e.g. Azure Storage, ServiceBus, Timers, etc.) make sure you've called the registration method for the extension(s) in your startup code (e.g. builder.AddAzureStorage(), builder.AddServiceBus(), builder.AddTimers(), etc.).
[2/19/2020 4:01:52 PM] Error indexing method 'HttpTrigger'
[2/19/2020 4:01:52 PM] Microsoft.Azure.WebJobs.Host: Error indexing method 'HttpTrigger'. Microsoft.Azure.WebJobs.Host: Cannot bind parameter 'toDoItems' to type IEnumerable`1. Make sure the parameter Type is supported by the binding. If you're using binding extensions (e.g. Azure Storage, ServiceBus, Timers, etc.) make sure you've called the registration method for the extension(s) in your startup code (e.g. builder.AddAzureStorage(), builder.AddServiceBus(), builder.AddTimers(), etc.).
[2/19/2020 4:01:52 PM] Function 'HttpTrigger' failed indexing and will be disabled.
[2/19/2020 4:01:52 PM] No job functions found. Try making your job classes and methods public. If you're using binding extensions (e.g. Azure Storage, ServiceBus, Timers, etc.) make sure you've called the registration method for the extension(s) in your startup code (e.g. builder.AddAzureStorage(), builder.AddServiceBus(), builder.AddTimers(), etc.).
[2/19/2020 4:01:52 PM] Initializing function HTTP routes
[2/19/2020 4:01:52 PM] Mapped function route 'api/HttpTrigger' [get] to 'HttpTrigger'
[2/19/2020 4:01:52 PM]
[2/19/2020 4:01:52 PM] Host initialized (199ms)
[2/19/2020 4:01:52 PM] Host started (206ms)
[2/19/2020 4:01:52 PM] Job host started
[2/19/2020 4:01:52 PM] The 'HttpTrigger' function is in error: Microsoft.Azure.WebJobs.Host: Error indexing method 'HttpTrigger'. Microsoft.Azure.WebJobs.Host: Cannot bind parameter 'toDoItems' to type IEnumerable`1. Make sure the parameter Type is supported by the binding. If you're using binding extensions (e.g. Azure Storage, ServiceBus, Timers, etc.) make sure you've called the registration method for the extension(s) in your startup code (e.g. builder.AddAzureStorage(), builder.AddServiceBus(), builder.AddTimers(), etc.).

从F＃代码删除类型，只是返回toDoItems从CosmosDB也导致错误。

[2/19/2020 4:22:33 PM] Generating 1 job function(s)
[2/19/2020 4:22:33 PM] No job functions found. Try making your job classes and methods public. If you're using binding extensions (e.g. Azure Storage, ServiceBus, Timers, etc.) make sure you've called the registration method for the extension(s) in your startup code (e.g. builder.AddAzureStorage(), builder.AddServiceBus(), builder.AddTimers(), etc.).
[2/19/2020 4:22:33 PM] Initializing function HTTP routes