.net core 2.2 无法处理正文中的加密字符串,即使媒体类型显示 application/json

.net core 2.2 unable to handle encrypted string in body even though mediatype says application/json

我有第三方向我的 API 发布请求...他们将加密文本作为正文发布,但还包括 application/json 作为内容类型。有什么方法可以让 .Net Core 2.2 来处理这个问题...我试过了...

    [HttpPost("/callback/thirdparty")]
    [AllowAnonymous]
    public IActionResult Thirdparty([FromBody]dynamic body)
    {

    [HttpPost("/callback/thirdparty")]
    [AllowAnonymous]
    public IActionResult Thirdparty([FromBody]string body)
    {

但都不起作用。

    Request Headers
    Content-Type: "application/json"
    Accept: "*/*"
    Cache-Control: "no-cache"
    Accept-Encoding: "gzip, deflate"
    Content-Length: 155
    Connection: "keep-alive"
    Request Body
    z42T\/+j28AyZRslEXIZx9Vt87D1HOdMZqukzIi7s4gbtZqtdJJjJtQMkZ+O9vG3VlfJZ+6Ro7vwE\n6nTSwqczc2SwPiAaRjgv7nauvR2E3d8tk8zbVD+Ck6TL12hJHFHVySAP7I482lQU+SmE31OmDw==
    [HttpPost("/callback/thirdparty")]
    [AllowAnonymous]
    public IActionResult Thirdparty()
    {
        try
        {
            using (StreamReader reader = new StreamReader(Request.Body))
            {
                var body = reader.ReadToEnd();

现在我的正文中有一个字符串!