枚举类型不再在.Net Core 3.0 FromBody请求对象中工作 [英] Enum type no longer working in .Net core 3.0 FromBody request object

问题描述

我最近将我的Web api从.Net core 2.2升级到了.Net core 3.0，并注意到当我在帖子中将枚举传递到端点时，我的请求现在出现错误。例如：

I have recently upgraded my web api from .Net core 2.2 to .Net core 3.0 and noticed that my requests are getting an error now when I pass an enum in a post to my endpoint. For example:

我的api端点具有以下模型：

I have the following model for my api endpoint:

    public class SendFeedbackRequest
    {
        public FeedbackType Type { get; set; }
        public string Message { get; set; }
    }

其中的FeedbackType如下：

Where the FeedbackType looks like so:

    public enum FeedbackType
    {
        Comment,
        Question
    }

这是控制器方法：

    [HttpPost]
    public async Task<IActionResult> SendFeedbackAsync([FromBody]SendFeedbackRequest request)
    {
        var response = await _feedbackService.SendFeedbackAsync(request);

        return Ok(response);
    }

我将其作为发布正文发送给控制器的地方：

Where I send this as the post body to the controller:

{
    message: "Test"
    type: "comment"
}

我现在在此端点上发布以下错误：

And I am now getting the following error posting to this endpoint:

JSON值无法转换为MyApp.Feedback.Enums.FeedbackType。路径：$。type |行号：0 | BytePositionInLine：13

这在2.2版本中有效，并在3.0版中启动了错误。我看到了关于JSON序列化程序在3.0版中发生变化的讨论，

This was working in 2.2 and started the error in 3.0. I saw talk about the json serializer changing in 3.0, but not sure how this should be handled.

推荐答案

框架默认不再使用Json.Net和新的内置序列化程序

framework no longer uses Json.Net by default and the new built-in serializer has its own issues and learning curve to get the expected features.

如果要切换回以前使用 Newtonsoft的默认设置，则有其自身的问题和学习曲线。 Json ，那么您必须执行以下操作：

If you’d like to switch back to the previous default of using Newtonsoft.Json, then you'll have to do the following:

1. 安装 Microsoft.AspNetCore.Mvc.NewtonsoftJson NuGet软件包。

1. Install the Microsoft.AspNetCore.Mvc.NewtonsoftJson NuGet package.

在 ConfigureServices（）中添加对 AddNewtonsoftJson（）

public void ConfigureServices(IServiceCollection services) {
    //...

    services.AddControllers()
        .AddNewtonsoftJson(); //<--

    //...
}

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