使用 C# 客户端的 ASP.NET Web API Core 5.0 中的错误

Question

我正在尝试在 ASP.NET Core 5.0 中创建一个 HTTP POST Web API，在其中我可以在字典变量PostValues中的键/值对中接收任何数据作为字符串，如字符串、Int 作为字符串或二进制、图像作为 Base64：

网络API：

public class WebserviceController : ControllerBase
{
    [HttpPost]
    [Consumes("application/json")]
    [Produces("application/json")]
    public String Post([FromBody] Dictionary<String, String> PostValues)
    {
        return JsonConvert.SerializeObject(new ClassResponse(true, PostValues));
    }
}

客户：

RestClient client = new RestClient("https://localhost:44395/webservice");
RestRequest request = new RestRequest(Method.POST);
request.RequestFormat = DataFormat.Json;
request.AddHeader("Content-Type", "application/json");

request.AddParameter("Key1", "Value1");
request.AddParameter("Key2", "Value2");

IRestResponse response = client.Post<String>(request);

Response = JsonConvert.DeserializeObject<ClassResponse>(response.Content);

传递/返回数据的通用类：

public class ClassResponse
{
    public ClassResponse(Boolean Success, Object Result)
    {
        this.Success = true;
        this.Result = Result;
    }

    public Boolean Success;

    public Object Result;
}

但是我在response.Content收到错误（不是异常）： {"type":"https://tools.ietf.org/html/rfc7231#section-6.5.1","title":"One or more validation errors occurred.","status":400,"traceId":"00-7462e05ef46bf946bc7d102a93cc479e-06107777372f8f46-00","errors":{"$":["'w' is an invalid start of a value. Path: $ | LineNumber: 0 | BytePositionInLine: 0."]}}和response.StatusCode为： System.Net.HttpStatusCode.BadRequest