为什么我的 ASP.Net Core Web API 控制器不返回 XML? [英] Why won't my ASP.Net Core Web API Controller return XML?

问题描述

我有以下简单的 Web API 控制器:

I have the following simple Web API controller:

    // GET: api/customers
    [HttpGet]
    public async Task<IActionResult> Get()
        {
        var customers = await uow.Users.GetAllAsync();
        var dto = customers.Select(p => new CustomerDto {Id = p.Id, Email = p.Email, UserName = p.UserName});
        return Ok(dto); // IEnumerable<CustomerDto>
        }

在 Postman 中，我将 Accept 标头设置为 application/xml，但无论我如何尝试，我都只能取回 JSON 数据.

In Postman, I'm setting the Accept header to application/xml, but no matter what I try, I can only get JSON data back.

我在某处读到，为了获取 XML，我必须将 [DataContract] 和 [DataMember] 属性添加到我的 DTO，现在看起来像这样:

I read somewhere that in order to get XML, I must add [DataContract] and [DataMember] attributes to my DTO, which now looks like this:

[DataContract]
public class CustomerDto
    {
    [DataMember]
    public string Id { get; set; }

    [Required]
    [EmailAddress]
    [Display(Name = "Email")]
    [DataMember]
    public string Email { get; set; }

    [Required]
    [Display(Name = "Login Name")]
    [DataMember]
    public string UserName { get; set; }
    }

我已经使用了几个小时了，但我只是不明白为什么它不起作用.我试过了:

I've been at it several hours now and I'm just not seeing why it doesn't work. I've tried:

• 使action方法同步和异步

• Making the action method synchronous and asynchronous

直接返回数据，并设置返回类型为IEnumerable

Returning the data directly, and setting the return type to IEnumerable<CustomerDto>

将集合转换为数组而不是列表

Converting the collection to an array instead of a list

返回一个 IActionResult

返回单个项目，而不是集合

Returning a single item, instead of a collection

我已通过在调试器中检查 Accept 标头来验证它是否显示在请求中.

I've verified that the Accept header is showing up in the request by examining it in the debugger.

大量使用 Bing 搜索"；并阅读各种博客

Lots of "Googling with Bing" and reading various blogs

从模板创建一个新的 WebAPI 项目，看看那里是否有任何灵感(不是真的).​​

Creating a new WebAPI project from the template and seeing if there is any inspiration there (not really).

我希望它很简单，但我看不到它......

I expect it's simple, but I can't see it...

推荐答案

Xml 格式化程序是单独包的一部分:Microsoft.AspNetCore.Mvc.Formatters.Xml

Xml formatters are part of a separate package: Microsoft.AspNetCore.Mvc.Formatters.Xml

添加上面的包并更新你的startup.cs，如下所示:

Add the above package and update your startup.cs like below:

services
    .AddMvc()
    .AddXmlDataContractSerializerFormatters();

或

services
    .AddMvc()
    .AddXmlSerializerFormatters();

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