Dotnet Core 3.1 Kestrel Web API BadRequest、System.NotSupportedException答案

【问题标题】：Dotnet Core 3.1 Kestrel Web API BadRequest, System.NotSupportedExceptionDotnet Core 3.1 Kestrel Web API BadRequest、System.NotSupportedException
【发布时间】：2020-02-10 07:18:13
【问题描述】：

在我的服务器中，我有这样的功能

[HttpPost()]
public void Hello([FromBody]int Version)
{
}

如果我省略了 [FromBody]int Version 参数，我能够调用上述 API

var c = new HttpClient();
var Json = new StringContent(JsonConvert.SerializeObject(new { Version = 123}), Encoding.UTF8, "application/json")
var Resp = Api.PostAsync("http://MyURL", Json).Result;

如果包含 [FromBody]int Version。我收到以下错误：

Request.Body
{Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http.HttpRequestStream}
    CanRead: true
    CanSeek: false
    CanTimeout: false
    CanWrite: false
    Length: '((Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http.HttpRequestStream)Request.Body).Length' threw an exception of type 'System.NotSupportedException'
    Position: '((Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http.HttpRequestStream)Request.Body).Position' threw an exception of type 'System.NotSupportedException'
    ReadTimeout: 'Request.Body.ReadTimeout' threw an exception of type 'System.InvalidOperationException'
    WriteTimeout: '((Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http.HttpRequestStream)Request.Body).WriteTimeout' threw an exception of type 'System.NotSupportedException'

【问题讨论】：

标签： .net-core dotnet-httpclient kestrel-http-server

【解决方案1】：

我在 dotnet core 3.x 中找到了答案。

使用 Microsoft.AspNetCore.Mvc.NewtonsoftJson 而不是 NewtonsoftJson
添加services.AddControllers().AddNewtonsoftJson();

正如https://docs.microsoft.com/en-us/aspnet/core/migration/22-to-30?view=aspnetcore-2.2&tabs=visual-studio#jsonnet-support中指出的那样

【讨论】：