c# - 在 asp.net core 中将字典发布到 web api

Question

我有使用 Asp.Net Core 开发的简单网络 api，我正在尝试使用 HttpClient 发布键值对。我尝试了两种方法。

第一种方法

[Route("api/[controller]/[action]")]
public class TransformationController : Controller
{
    private IServiceResolver _serviceResolver;
    public TransformationController(IServiceResolver serviceResolver)
    {
        _serviceResolver = serviceResolver;
    }       

    [HttpPost]
    [ActionName("Post1")]
    public void Post1([FromBody]Dictionary<string, string> data)
    {
       // do something
    }
}

然后我发布如下

    [Fact]
    public void TestPost1()
    {
        var content = new Dictionary<string, string>();
        content.Add("firstname", "foo");            
        var httpContent = new FormUrlEncodedContent(content);

        var client = new HttpClient();
        var result = client.PostAsync("http://localhost:17232/api/Transformation/Post1", httpContent).GetAwaiter().GetResult();
    }

但是我得到了Unsupported Media Type错误

{StatusCode: 415, ReasonPhrase: 'Unsupported Media Type', Version: 1.1, Content: System.Net.Http.StreamContent, Headers: { Date: Mon, 29 Aug 2016 19:44:44 GMT Server: Kestrel X-SourceFiles: =?UTF-8?B?QzpccmVwb3NcY3ItbWV0YXRhc2tlclxzcmNcSW5ib3VuZEludGVncmF0aW9uXFRyYW5zZm9ybWF0aW9ucy5BcGlcYXBpXFRyYW5zZm9ybWF0aW9uXFRyYW5zZm9ybWF0aW9uMQ==?= X-Powered-By: ASP.NET Content-Length: 0 }}

方法二
由于我无法在 FormUrlEncodedContent 中指定内容类型和编码，我更改了 post 方法的签名，现在它以 Json 字符串作为参数。想法是将字符串反序列化为字典。

    [HttpPost]
    [ActionName("Post2")]
    public void Post2([FromBody]string data)
    {
        var dictionary = JsonConvert.DeserializeObject<Dictionary<string, string>>(data);
     // do something here

     }

然后我发布下面的字符串

    [Fact]
    public void TestPost2()
    {   
        var httpContent = new StringContent("{ \"firstName\": \"foo\" }", Encoding.UTF8, "application/json");

        var client = new HttpClient();
        var result = client.PostAsync("http://localhost:17232/api/Transformation/Post2", httpContent).GetAwaiter().GetResult();
    }

但是当我调试测试时； Post2方法中的data参数为null。

我不确定这两种方法都缺少什么？有人可以帮忙吗

更新1
如果我使用 POSTMAN 发布数据，那么它就可以工作了。所以对于方法 1，我可以将原始数据发布为

{
  "firstname": "foo"
}

和 Approach2 将原始数据发布为

 "{\"firstname\": \"foo\"}"

但是当我使用 HttpClient 时相同的数据不起作用

Answer 1

尝试合并两种方法:

[Fact]
public void TestPost3()
{   
    var httpContent = new StringContent("{ \"firstName\": \"foo\" }", Encoding.UTF8, "application/json");

    var client = new HttpClient();
    var result = client.PostAsync("http://localhost:17232/api/Transformation/Post3", httpContent).GetAwaiter().GetResult();
}

[HttpPost]
[ActionName("Post3")]
public void Post3([FromBody]IDictionary<string, string> data)
{
   // do something
}