.net 8 azure 函数（http 触发器）返回空对象，尽管对象具有值

Question

我编写了一个非常简单的天蓝色http触发函数，它返回一个对象，但在邮递员响应中我得到空对象。触发响应类型是 IActionResult，我返回为“new OkObjectResult(list);”。这是一个非常奇怪的问题。在 .net 6 中它可以工作，但在 .net 8 版本中不起作用。

示例代码如下。

[Function("Function")]
public IActionResult Run([HttpTrigger(AuthorizationLevel.Function, "get", "post")] HttpRequest req)
{
    _logger.LogInformation("C# HTTP trigger function processed a request.");
    List<MyClass> list = new List<MyClass>()
    {
        new MyClass()
        {
            Name="abc"
        }
    };
  return  new OkObjectResult(list);
    
}

邮递员回复：

Csproj 文件：

<Project Sdk="Microsoft.NET.Sdk">
  <PropertyGroup>
    <TargetFramework>net8.0</TargetFramework>
    <AzureFunctionsVersion>v4</AzureFunctionsVersion>
    <OutputType>Exe</OutputType>
    <ImplicitUsings>enable</ImplicitUsings>
    <Nullable>enable</Nullable>
  </PropertyGroup>
  <ItemGroup>
    <FrameworkReference Include="Microsoft.AspNetCore.App" />
    <PackageReference Include="Microsoft.Azure.Functions.Worker" Version="1.20.1" />
    <PackageReference Include="Microsoft.Azure.Functions.Worker.Extensions.Http" Version="3.1.0" />
    <PackageReference Include="Microsoft.Azure.Functions.Worker.Extensions.Http.AspNetCore" Version="1.2.0" />
    <PackageReference Include="Microsoft.Azure.Functions.Worker.Sdk" Version="1.16.4" />
    <PackageReference Include="Microsoft.ApplicationInsights.WorkerService" Version="2.21.0" />
    <PackageReference Include="Microsoft.Azure.Functions.Worker.ApplicationInsights" Version="1.1.0" />
  </ItemGroup>
  <ItemGroup>
    <None Update="host.json">
      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
    </None>
     </ItemGroup>
  <ItemGroup>
    <Using Include="System.Threading.ExecutionContext" Alias="ExecutionContext" />
  </ItemGroup>
</Project>

Answer 1

1. 创建新的 azure function app 项目

2. Function.cs代码：

    using System;
    using System.IO;
    using System.Threading.Tasks;
    using Microsoft.AspNetCore.Mvc;
    using Microsoft.Azure.WebJobs;
    using Microsoft.Azure.WebJobs.Extensions.Http;
    using Microsoft.AspNetCore.Http;
    using Microsoft.Extensions.Logging;
    using Newtonsoft.Json;
    using System.Collections.Generic;
    
    namespace FunctionApp3
    {
        public class MyClass
        {
            public string Name { get; set; }
        }
    
        public static class Function
        {
            [FunctionName("Function")]
            public static IActionResult Run([HttpTrigger(AuthorizationLevel.Function, "get", "post")] HttpRequest req, ILogger _logger)
            {
                _logger.LogInformation("C# HTTP trigger function processed a request.");
                List<MyClass> list = new List<MyClass>()
        {
            new MyClass()
            {
                Name="abc"
            }
        };
                return new OkObjectResult(list);
    
            }
        } 
    }

3. Csproj 文件：

<Project Sdk="Microsoft.NET.Sdk">
  <PropertyGroup>
    <TargetFramework>net8.0</TargetFramework>
    <AzureFunctionsVersion>v4</AzureFunctionsVersion>
  </PropertyGroup>
  <ItemGroup>
    <PackageReference Include="Microsoft.NET.Sdk.Functions" Version="4.1.1" />
  </ItemGroup>
  <ItemGroup>
    <None Update="host.json">
      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
    </None>
    <None Update="local.settings.json">
      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
      <CopyToPublishDirectory>Never</CopyToPublishDirectory>
    </None>
  </ItemGroup>
</Project>

Answer 2

我从 6 更新到 8 后也遇到同样的问题...