从 C# 中的 HTTPRequest 中检索请求有效负载值

Question

我正在尝试实现我自己的 LRS 来保存 TinCanAPI 语句，为此我需要检索存储学习活动语句详细信息的 Request Payload 中发送的值。 在开发人员工具中查看我的 WebAPI 调用时，我可以看到所需的值，但我无法使用 Request 对象找到它们。

如何从 Request 对象中检索 Request Payload 变量？我已经尝试了请求对象并查看了内容和属性字段，但我似乎看不到要在 C# 中引用的请求有效负载属性。我的有效载荷如下所示：

{
    "id": "d3d9aa2a-5f20-4303-84c3-1f6f5b4e9236",
    "timestamp": "2014-06-26T11:00:41.432Z",
    "actor": {
        "objectType": "Agent",
        "mbox": "mailto:name@company.com",
        "name": "My Name"
    },
    "verb": {
        "id": "http://adlnet.gov/expapi/verbs/attempted",
        "display": {
            "und": "attempted"
        }
    },
    "context": {
        "extensions": {
            "http://tincanapi.com/JsTetris_TCAPI/gameId": "5686f104-3301-459d-9487-f84af3b3915c"
        },
        "contextActivities": {
            "grouping": [
                {
                    "id": "http://tincanapi.com/JsTetris_TCAPI",
                    "objectType": "Activity"
                }
            ]
        }
    },
    "object": {
        "id": "http://tincanapi.com/JsTetris_TCAPI",
        "objectType": "Activity",
        "definition": {
            "type": "http://adlnet.gov/expapi/activities/media",
            "name": {
                "en-US": "Js Tetris - Tin Can Prototype"
            },
            "description": {
                "en-US": "A game of tetris."
            }
        }
    }
}

我尝试过使用：

var test1 = Request.ToString(); **EMPTY STRING**

var test1 = Request.Content.ReadAsStringAsync().Result; **EMPTY STRING**

var test2 = Request.Content.ReadAsFormDataAsync().Result; **THROWS FORMATTER ERROR DESPITE config.Formatters.JsonFormatter.SupportedMediaTypes.Add(new MediaTypeHeaderValue("application/json")); added in the webapiconfig.cs

Answer 1

我可以通过如下更改我的 WebAPI 控制器来检索发送的语句值：

public void Put([FromBody]TinCan.Statement statement)
{
   var actor = statement.actor;
   var context = statement.context;
   var target = statement.target;
   var timestamp = statement.timestamp;
   var verb = statement.verb;

   ...................

Answer 2

 try {
                //String payloadRequest = getBody(request);
                // System.out.println("payloadRequest : "+payloadRequest);
                StringBuilder buffer = new StringBuilder();
                 BufferedReader reader = request.getReader();
                 String line;
                 while ((line = reader.readLine()) != null) {
                     buffer.append(line);
                 }
                 String data = buffer.toString();
                 System.out.println("payloadRequest : "+data);
            } catch (Exception e1) {
                // TODO Auto-generated catch block
                e1.printStackTrace();
            }

Answer 3

试试这个：

var value = Request["var_name"];