我有一个 XML 字符串，我需要将其作为 XML 文档返回。默认情况下，返回的内容类型为text/plain。内容已呈现，但我需要内容类型application/xml。我启用了 RespectBrowserAcceptHeader 选项，该选项会将对象序列化为 XML 并设置正确的内容类型，除非对象是字符串。

[HttpGet]
public string Get()
{
   return xmlString;
}

public static string xmlString = @"<?xml version=""1.0"" encoding=""UTF-8""?>
                     <sample>
                         Hello World.
                     </sample>";

简答

如果您有一个 XML 字符串并且需要将其作为 XML 文档返回，则返回内容结果 https://github.com/aspnet/Mvc/blob/a60cce1dade062454f106a1317fc198fc8778035/src/Microsoft.AspNetCore.Mvc.Core/ContentResult.cs.

[HttpGet]
public ContentResult Get()
{
    return new ContentResult
    {
        ContentType = "application/xml",
        Content = xmlString,
        StatusCode = 200
    };
}

完整示例

控制器

using Microsoft.AspNetCore.Mvc;

namespace MyXmlSample
{
    [Route("xml")]
    public class MyXmlController
    {
        public static string xmlString = 

@"<?xml version=""1.0"" encoding=""UTF-8""?>
<sample>
  Hello World.
</sample>";

        [HttpGet]
        public ContentResult Get()
        {
            return new ContentResult
            {
                ContentType = "application/xml",
                Content = xmlString,
                StatusCode = 200
            };
        }
    }
}

Startup

using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.Extensions.DependencyInjection;

namespace MyXmlSample
{
    public class Program
    {
        public void ConfigureServices(IServiceCollection services)
        {
            services.AddMvcCore();    
        }

        public void Configure(IApplicationBuilder app)
        {
            app.UseMvc();
        }

        public static void Main(string[] args)
        {
            var host = new WebHostBuilder()
                .UseKestrel()
                .UseStartup<Program>()
                .Build();

            host.Run();
        }
    }
}

项目.json

{
  "version": "1.0.0-*",
  "compilationOptions": {
    "emitEntryPoint": true
  },
  "dependencies": {
    "Microsoft.AspNetCore.Mvc.Core": "1.0.0-*",
    "Microsoft.AspNetCore.Server.Kestrel": "1.0.0-*",
    "Microsoft.NETCore.App": "1.0.0-rc2-*"
  },
  "frameworks": {
    "netcoreapp1.0": {
      "imports": [
        "dnxcore50",
        "portable-net45"
      ]
    }
  },
  "runtimes": {
    "win10-x64": {}
  }
}

Response

HTTP/1.1 200 OK
Date: Sun, 17 Apr 2016 22:10:45 GMT
Content-Type: application/xml
Server: Kestrel
Content-Length: 75

<?xml version="1.0" encoding="UTF-8"?>
<sample>
  Hello World.
</sample>

这是在 GitHub 上的 https://github.com/bigfont/StackOverflow/tree/master/AspNetCoreApiReturnXmlString为了更好的衡量。 :)