小贝子编程

ReadAsStringAsync 只返回 JSON / BODY 的一部分



我正在尝试设置自动车牌识别 (ALPR) 系统的集成点。我正在使用OpenALPR。

在本地PC上，有一个安装了IP摄像机的代理，它将读取车牌并将信息发送到云。在云中有一个 WebHook 集成点，每次注册车牌时都会触发该集成点。

在OpenALPR网页中，WebHook文档说：

WebHooks send an HTTP POST to your URL every time a plate is received or an alert is triggered. The POST body contains the license plate data.

我已经通过将输出发送到在此 URL 上找到的 WebHook 测试页面来测试集成：https://webhook.site/

结果显示在本文末尾。可以看出，输出是 JSON 格式。

我已经做了一个RESTful服务并将其部署在Azure中。我的问题是，当我读取结果时，我没有得到完整的 JSON 结果。根据 http://webhook.site 上的测试，我知道 WebHook 提供程序(发送者)发送所有 JSON 数据，所以我无法弄清楚为什么它没有完全接收。

如果有更好的方法在我的 Web 应用程序中接收 JSON 结果，我很高兴听到它。以下是我对如何完成工作的看法。除非它不起作用！:-D

谁能告诉我我做错了什么，为什么只读取了部分结果？

这是在 HTTP POST 上调用的代码的一部分。

// POST: api/OpenALP
public HttpResponseMessage Post([FromBody]string value)
{
var content = Request.Content;
Request.Content.LoadIntoBufferAsync().Wait();
string jsonContent = content.ReadAsStringAsync().Result;
HttpResponseMessage response = Request.CreateResponse(HttpStatusCode.OK);
return response;
}

编辑：不知道这是否重要 - 但调试是通过将服务发布为"调试"并附加调试器来完成的。下面显示的内容是从断点复制出来的。

这就是我得到的string jsonContent

" "color": [{"confidence": 92.68022918701172, "name": "white"}, {"confidence": 2.699702501296997, "name": "silver-gray"}, {"confidence": 1.8385039567947388, "name": "yellow"}, {"confidence": 1.024902582168579, "name": "gold-beige"}, {"confidence": 0.5838126540184021, "name": "green"}], "make": [{"confidence": 16.192890167236328, "name": "renault"}, {"confidence": 12.871005058288574, "name": "mercedes-benz"}, {"confidence": 7.908616065979004, "name": "volkswagen"}, {"confidence": 4.901283264160156, "name": "opel"}, {"confidence": 4.583385467529297, "name": "bmw"}], "body_type": [{"confidence": 20.72427749633789, "name": "sedan-standard"}, {"confidence": 18.412166595458984, "name": "van-mini"}, {"confidence": 17.614177703857422, "name": "sedan-compact"}, {"confidence": 12.435933113098145, "name": "sedan-wagon"}, {"confidence": 6.872223377227783, "name": "suv-crossover"}], "year": [{"confidence": 23.91012191772461, "name": "2005-2009"}, {"confidence": 19.78921890258789, "name": "2000-2004"}, {"confidence": 16.811452865600586, "name": "1995-1999"}, {"confidence": 11.53968620300293, "name": "2010-2014"}, {"confidence": 8.91786003112793, "name": "1985-1989"}], "make_model": [{"confidence": 2.5598113536834717, "name": "renault_kangoo"}, {"confidence": 1.564223289489746, "name": "fiat_doblo"}, {"confidence": 1.5174164772033691, "name": "alfa-romeo_147"}, {"confidence": 1.0350353717803955, "name": "citroen_2cv"}, {"confidence": 0.986167311668396, "name": "volkswagen_caddy"}]}, "best_uuid": "WBFOY6ZDPZR03FGCE5C1S9J5GIH2TFH1H6QPMX7X-645063384-1521329355349", "epoch_end": 1521329358227, "best_image_width": 640, "data_type": "alpr_group", "best_image_height": 480, "frame_end": 865634, "is_parked": false, "web_server_config": {"agent_label": "DESKTOP-B3PMA1C", "camera_label": "WebCamHKA"}, "best_region": "eu-dk", "uuids": ["WBFOY6ZDPZR03FGCE5C1S9J5GIH2TFH1H6QPMX7X-645063384-1521329355147", "WBFOY6ZDPZR03FGCE5C1S9J5GIH2TFH1H6QPMX7X-645063384-1521329355183", "WBFOY6ZDPZR03FGCE5C1S9J5GIH2TFH1H6QPMX7X-645063384-1521329355248", "WBFOY6ZDPZR03FGCE5C1S9J5GIH2TFH1H6QPMX7X-645063384-1521329355284", "WBFOY6ZDPZR03FGCE5C1S9J5GIH2TFH1H6QPMX7X-645063384-1521329355349", "WBFOY6ZDPZR03FGCE5C1S9J5GIH2TFH1H6QPMX7X-645063384-1521329355386", "WBFOY6ZDPZR03FGCE5C1S9J5GIH2TFH1H6QPMX7X-645063384-1521329355451", "WBFOY6ZDPZR03FGCE5C1S9J5GIH2TFH1H6QPMX7X-645063384-1521329355523", "WBFOY6ZDPZR03FGCE5C1S9J5GIH2TFH1H6QPMX7X-645063384-1521329355558", "WBFOY6ZDPZR03FGCE5C1S9J5GIH2TFH1H6QPMX7X-645063384-1521329355700", "WBFOY6ZDPZR03FGCE5C1S9J5GIH2TFH1H6QPMX7X-645063384-1521329355777", "WBFOY6ZDPZR03FGCE5C1S9J5GIH2TFH1H6QPMX7X-645063384-1521329355815", "WBFOY6ZDPZR03FGCE5C1S9J5GIH2TFH1H6QPMX7X-645063384-1521329355889", "WBFOY6ZDPZR03FGCE5C1S9J5GIH2TFH1H6QPMX7X-645063384-1521329356029", "WBFOY6ZDPZR03FGCE5C1S9J5GIH2TFH1H6QPMX7X-645063384-1521329356274", "WBFOY6ZDPZR03FGCE5C1S9J5GIH2TFH1H6QPMX7X-645063384-1521329356421", "WBFOY6ZDPZR03FGCE5C1S9J5GIH2TFH1H6QPMX7X-645063384-1521329356598", "WBFOY6ZDPZR03FGCE5C1S9J5GIH2TFH1H6QPMX7X-645063384-1521329356738", "WBFOY6ZDPZR03FGCE5C1S9J5GIH2TFH1H6QPMX7X-645063384-1521329356773", "WBFOY6ZDPZR03FGCE5C1S9J5GIH2TFH1H6QPMX7X-645063384-1521329356874", "WBFOY6ZDPZR03FGCE5C1S9J5GIH2TFH1H6QPMX7X-645063384-1521329356909", "WBFOY6ZDPZR03FGCE5C1S9J5GIH2TFH1H6QPMX7X-645063384-1521329357014", "WBFOY6ZDPZR03FGCE5C1S9J5GIH2TFH1H6QPMX7X-645063384-1521329357049", "WBFOY6ZDPZR03FGCE5C1S9J5GIH2TFH1H6QPMX7X-645063384-1521329357148", "WBFOY6ZDPZR03FGCE5C1S9J5GIH2TFH1H6QPMX7X-645063384-1521329357387", "WBFOY6ZDPZR03FGCE5C1S9J5GIH2TFH1H6QPMX7X-645063384-1521329357422", "WBFOY6ZDPZR03FGCE5C1S9J5GIH2TFH1H6QPMX7X-645063384-1521329357567", "WBFOY6ZDPZR03FGCE5C1S9J5GIH2TFH1H6QPMX7X-645063384-1521329357631", "WBFOY6ZDPZR03FGCE5C1S9J5GIH2TFH1H6QPMX7X-645063384-1521329357734", "WBFOY6ZDPZR03FGCE5C1S9J5GIH2TFH1H6QPMX7X-645063384-1521329357870", "WBFOY6ZDPZR03FGCE5C1S9J5GIH2TFH1H6QPMX7X-645063384-1521329357976", "WBFOY6ZDPZR03FGCE5C1S9J5GIH2TFH1H6QPMX7X-645063384-1521329358012", "WBFOY6ZDPZR03FGCE5C1S9J5GIH2TFH1H6QPMX7X-645063384-1521329358048", "WBFOY6ZDPZR03FGCE5C1S9J5GIH2TFH1H6QPMX7X-645063384-1521329358084", "WBFOY6ZDPZR03FGCE5C1S9J5GIH2TFH1H6QPMX7X-645063384-1521329358155", "WBFOY6ZDPZR03FGCE5C1S9J5GIH2TFH1H6QPMX7X-645063384-1521329358191", "WBFOY6ZDPZR03FGCE5C1S9J5GIH2TFH1H6QPMX7X-645063384-1521329358227"], "plate_indexes": [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0], "travel_direction": 255.1732177734375, "country": "eu", "best_plate_number": "AF22454", "best_region_confidence": 91.45714569091797, "agent_version": "2.5.103", "candidates": [{"matches_template": 0, "plate": "AF22454", "confidence": 94.99976348876953}, {"matches_template": 0, "plate": "AF2245", "confidence": 69.99081420898438}, {"matches_template": 0, "plate": "AF224", "confidence": 68.92207336425781}, {"matches_template": 0, "plate": "A22454", "confidence": 65.7693099975586}, {"matches_template": 0, "plate": "AY22454", "confidence": 65.72945404052734}, {"matches_template": 0, "plate": "AT22454", "confidence": 65.69474029541016}]}"

如果我查看 WebHook 测试站点 (http://webhoot.site) 上的输出，我会得到以下结果：

{
"epoch_start": 1521286407536,
"camera_id": 645063384,
"frame_start": 109416,
"agent_uid": "WBFOY6ZDPZR03FGCE5C1S9J5GIH2TFH1H6QPMX7X",
"best_confidence": 94.99918365478516,
"company_id": "d1806fef-5549-4915-86a8-1b1f975e8df9",
"version": 2,
"agent_type": "alprd",
"best_plate": {
"plate": "AF25463",
"confidence": 94.99918365478516,
"region_confidence": 99,
"vehicle_region": {
"y": 1,
"x": 80,
"height": 479,
"width": 479
},
"region": "eu-dk",
"plate_index": 0,
"processing_time_ms": 40.263999938964844,
"candidates": [
{
"matches_template": 0,
"plate": "AF25463",
"confidence": 94.99918365478516
}
],
"coordinates": [
{
"y": 248,
"x": 286
},
{
"y": 251,
"x": 599
},
{
"y": 318,
"x": 599
},
{
"y": 314,
"x": 286
}
],
"matches_template": 0,
"requested_topn": 10
},
"vehicle": {
"orientation": [
{
"confidence": 48.20035171508789,
"name": "270"
},
{
"confidence": 26.80327606201172,
"name": "225"
},
{
"confidence": 10.317419052124023,
"name": "315"
},
{
"confidence": 5.075159072875977,
"name": "180"
},
{
"confidence": 4.022528648376465,
"name": "0"
}
],
"color": [
{
"confidence": 89.68812561035156,
"name": "blue"
},
{
"confidence": 3.044862747192383,
"name": "silver-gray"
},
{
"confidence": 2.5986762046813965,
"name": "white"
},
{
"confidence": 2.5680367946624756,
"name": "green"
},
{
"confidence": 0.8009989857673645,
"name": "purple"
}
],
"make": [
{
"confidence": 11.725887298583984,
"name": "renault"
},
{
"confidence": 10.687095642089844,
"name": "land-rover"
},
{
"confidence": 9.455676078796387,
"name": "nissan"
},
{
"confidence": 7.793033123016357,
"name": "citroen"
},
{
"confidence": 6.8527727127075195,
"name": "suzuki"
}
],
"body_type": [
{
"confidence": 19.176368713378906,
"name": "suv-crossover"
},
{
"confidence": 18.331125259399414,
"name": "suv-standard"
},
{
"confidence": 18.325965881347656,
"name": "truck-standard"
},
{
"confidence": 11.761542320251465,
"name": "sedan-wagon"
},
{
"confidence": 10.666444778442383,
"name": "sedan-compact"
}
],
"year": [
{
"confidence": 19.741708755493164,
"name": "2005-2009"
},
{
"confidence": 17.747791290283203,
"name": "2000-2004"
},
{
"confidence": 16.381860733032227,
"name": "1995-1999"
},
{
"confidence": 13.306379318237305,
"name": "1985-1989"
},
{
"confidence": 11.591310501098633,
"name": "1980-1984"
}
],
"make_model": [
{
"confidence": 7.200094223022461,
"name": "land-rover_defender"
},
{
"confidence": 2.6545894145965576,
"name": "land-rover_discovery"
},
{
"confidence": 1.7968538999557495,
"name": "toyota_land-cruiser"
},
{
"confidence": 1.6618626117706299,
"name": "suzuki_sj-samurai"
},
{
"confidence": 1.4205354452133179,
"name": "suzuki_vitara"
}
]
},
"best_uuid": "WBFOY6ZDPZR03FGCE5C1S9J5GIH2TFH1H6QPMX7X-645063384-1521286410173",
"epoch_end": 1521286411970,
"best_image_width": 640,
"data_type": "alpr_group",
"best_image_height": 480,
"frame_end": 109536,
"is_parked": false,
"web_server_config": {
"agent_label": "DESKTOP-B3PMA1C",
"camera_label": "WebCamHKA"
},
"best_region": "eu-dk",
"uuids": [
"WBFOY6ZDPZR03FGCE5C1S9J5GIH2TFH1H6QPMX7X-645063384-1521286407536",
"WBFOY6ZDPZR03FGCE5C1S9J5GIH2TFH1H6QPMX7X-645063384-1521286407571",
"WBFOY6ZDPZR03FGCE5C1S9J5GIH2TFH1H6QPMX7X-645063384-1521286407607",
"WBFOY6ZDPZR03FGCE5C1S9J5GIH2TFH1H6QPMX7X-645063384-1521286407783",
"WBFOY6ZDPZR03FGCE5C1S9J5GIH2TFH1H6QPMX7X-645063384-1521286407888",
"WBFOY6ZDPZR03FGCE5C1S9J5GIH2TFH1H6QPMX7X-645063384-1521286407991",
"WBFOY6ZDPZR03FGCE5C1S9J5GIH2TFH1H6QPMX7X-645063384-1521286408267",
"WBFOY6ZDPZR03FGCE5C1S9J5GIH2TFH1H6QPMX7X-645063384-1521286408301",
"WBFOY6ZDPZR03FGCE5C1S9J5GIH2TFH1H6QPMX7X-645063384-1521286408335",
"WBFOY6ZDPZR03FGCE5C1S9J5GIH2TFH1H6QPMX7X-645063384-1521286408579",
"WBFOY6ZDPZR03FGCE5C1S9J5GIH2TFH1H6QPMX7X-645063384-1521286408649",
"WBFOY6ZDPZR03FGCE5C1S9J5GIH2TFH1H6QPMX7X-645063384-1521286408860",
"WBFOY6ZDPZR03FGCE5C1S9J5GIH2TFH1H6QPMX7X-645063384-1521286408895",
"WBFOY6ZDPZR03FGCE5C1S9J5GIH2TFH1H6QPMX7X-645063384-1521286408930",
"WBFOY6ZDPZR03FGCE5C1S9J5GIH2TFH1H6QPMX7X-645063384-1521286408964",
"WBFOY6ZDPZR03FGCE5C1S9J5GIH2TFH1H6QPMX7X-645063384-1521286408999",
"WBFOY6ZDPZR03FGCE5C1S9J5GIH2TFH1H6QPMX7X-645063384-1521286409173",
"WBFOY6ZDPZR03FGCE5C1S9J5GIH2TFH1H6QPMX7X-645063384-1521286409278",
"WBFOY6ZDPZR03FGCE5C1S9J5GIH2TFH1H6QPMX7X-645063384-1521286409417",
"WBFOY6ZDPZR03FGCE5C1S9J5GIH2TFH1H6QPMX7X-645063384-1521286409484",
"WBFOY6ZDPZR03FGCE5C1S9J5GIH2TFH1H6QPMX7X-645063384-1521286409651",
"WBFOY6ZDPZR03FGCE5C1S9J5GIH2TFH1H6QPMX7X-645063384-1521286409789",
"WBFOY6ZDPZR03FGCE5C1S9J5GIH2TFH1H6QPMX7X-645063384-1521286409823",
"WBFOY6ZDPZR03FGCE5C1S9J5GIH2TFH1H6QPMX7X-645063384-1521286409999",
"WBFOY6ZDPZR03FGCE5C1S9J5GIH2TFH1H6QPMX7X-645063384-1521286410036",
"WBFOY6ZDPZR03FGCE5C1S9J5GIH2TFH1H6QPMX7X-645063384-1521286410140",
"WBFOY6ZDPZR03FGCE5C1S9J5GIH2TFH1H6QPMX7X-645063384-1521286410173",
"WBFOY6ZDPZR03FGCE5C1S9J5GIH2TFH1H6QPMX7X-645063384-1521286410208",
"WBFOY6ZDPZR03FGCE5C1S9J5GIH2TFH1H6QPMX7X-645063384-1521286410646",
"WBFOY6ZDPZR03FGCE5C1S9J5GIH2TFH1H6QPMX7X-645063384-1521286410751",
"WBFOY6ZDPZR03FGCE5C1S9J5GIH2TFH1H6QPMX7X-645063384-1521286410887",
"WBFOY6ZDPZR03FGCE5C1S9J5GIH2TFH1H6QPMX7X-645063384-1521286410923",
"WBFOY6ZDPZR03FGCE5C1S9J5GIH2TFH1H6QPMX7X-645063384-1521286410957",
"WBFOY6ZDPZR03FGCE5C1S9J5GIH2TFH1H6QPMX7X-645063384-1521286411099",
"WBFOY6ZDPZR03FGCE5C1S9J5GIH2TFH1H6QPMX7X-645063384-1521286411169",
"WBFOY6ZDPZR03FGCE5C1S9J5GIH2TFH1H6QPMX7X-645063384-1521286411204",
"WBFOY6ZDPZR03FGCE5C1S9J5GIH2TFH1H6QPMX7X-645063384-1521286411523",
"WBFOY6ZDPZR03FGCE5C1S9J5GIH2TFH1H6QPMX7X-645063384-1521286411626",
"WBFOY6ZDPZR03FGCE5C1S9J5GIH2TFH1H6QPMX7X-645063384-1521286411694",
"WBFOY6ZDPZR03FGCE5C1S9J5GIH2TFH1H6QPMX7X-645063384-1521286411797",
"WBFOY6ZDPZR03FGCE5C1S9J5GIH2TFH1H6QPMX7X-645063384-1521286411970"
],
"plate_indexes": [
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0
],
"travel_direction": 18.316375732421875,
"country": "eu",
"best_plate_number": "AF25463",
"best_region_confidence": 97.08333587646484,
"agent_version": "2.5.103",
"candidates": [
{
"matches_template": 0,
"plate": "AF25463",
"confidence": 94.99918365478516
},
{
"matches_template": 0,
"plate": "AF2546",
"confidence": 70.50904846191406
},
{
"matches_template": 0,
"plate": "AF254",
"confidence": 68.68018341064453
},
{
"matches_template": 0,
"plate": "AF254AF",
"confidence": 65.75811767578125
},
{
"matches_template": 0,
"plate": "A25463",
"confidence": 65.72001647949219
},
{
"matches_template": 0,
"plate": "AE25463",
"confidence": 65.68501281738281
}
]
}

编辑： 哦 - 我不能发布图片。我至少需要 10 个声誉才能发布它。 但我可以在这里链接到它：https://klitandersen-my.sharepoint.com/:i:/g/personal/henrik_klit-andersen_com/Ec7DQkhrcFhAgZ6wIF24MbkBgrPcbXsgSa7_msXLZDHXQw?e=cnluHm

看来我走在正确的轨道上，认为这是因为您的控制器方法中有一个[FromBody] string value参数。这似乎将内容缓冲区偏移了 1024 个字节，因此为什么您尝试将其作为方法主体中的字符串读取只会产生原始请求正文的一部分。

你可以在这里尝试一些事情(至少这是我能想到的)。首先，您应该尝试从中删除参数。这将立即解决此问题，您将能够毫无问题地阅读它，就像您现在只用一行尝试一样。

var postBodyString = Request.Content.ReadAsStringAsync().Result;

其次，您可以尝试将其读取为流并重置流的位置。如果您确实使用此选项 - 请确保使用using以便在完成后处理所有内容。我知道前段时间这对我不起作用，因为 Web API 中的ReadAsStreamAsync()是一个HttpBufferlessStream，我认为它不支持Seek操作。

var postStream = Request.Content.ReadAsStreamAsync().Result;
postStream.Seek(0, SeekOrigin.Begin);
var postBodyString = new StreamReader(postStream).ReadToEnd();

最后，您可以尝试将参数设为HttpMessageRequest，然后可以将其读取为字符串。

[Route("somePost")]
[HttpPost]
public IHttpActionResult DoSomething(HttpRequestMessage request)
{
var str = request.Content.ReadAsStringAsync().Result;
return Ok();
}

希望其中一些选项对您来说是可以接受的，或者至少可以让您走上正确的轨道。

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