这是我在这里的第一篇文章，我是C＃的新手。 我正在研究Microsoft Cognitive API（它从图像中提取信息），您发送HTTP请求，从Microsoft服务器获得答案。 - https://docs.microsoft.com/en-us/azure/cognitive-services/computer-vision/tutorials/csharptutorial
这是我的UnitTest（这个有效）
using Microsoft.VisualStudio.TestTools.UnitTesting;
using System.Diagnostics;
using fw8.CognitiveServices;
namespace ImageTests
{
[TestClass]
public class UnitTest1
{
[TestMethod]
public void TestImagefromURL()
{
Debug.WriteLine("Test was loaded");
Manager instance = new Manager();
var client = instance.StartMyTask().Result;
Debug.WriteLine("Caption: " + client.Description.Captions[0].Text);
}
}
}
此测试的输出是
Test Name: TestImagefromURL
Test Outcome: Passed
Result StandardOutput:
Trace du débogage :
Test was loaded
Task started
processing
finish
Caption: a man holding a cat
在类库中调用这些方法
using System.Threading.Tasks;
using Microsoft.ProjectOxford.Vision.Contract;
using Microsoft.ProjectOxford.Vision;
using System.IO;
using System.Diagnostics;
namespace fw8.CognitiveServices
{
public class Manager
{
public async Task<AnalysisResult> StartMyTask()
{
Debug.WriteLine("Task started");
return await UploadAndAnalyzeImage(@"C:\Users\danie\Desktop\tot.jpg");//For testing purpose, a file from my computer
}
private static async Task<AnalysisResult> UploadAndAnalyzeImage(string imageFilePath)
{
Debug.WriteLine("processing");
VisionServiceClient VisionServiceClient = new VisionServiceClient("APIKEY");
using (Stream imageFileStream = File.OpenRead(imageFilePath))
{
VisualFeature[] visualFeatures = new VisualFeature[] { VisualFeature.Adult, VisualFeature.Categories, VisualFeature.Color, VisualFeature.Description, VisualFeature.Faces, VisualFeature.ImageType, VisualFeature.Tags };
AnalysisResult analysisResult = await VisionServiceClient.AnalyzeImageAsync(imageFileStream, visualFeatures);
Debug.WriteLine("finish");
return analysisResult;
}
}
}
}
现在来自一个空白的MVC项目调用相同的方法
using fw8.CognitiveServices;
using System.Diagnostics;
using System.Web.Mvc;
namespace WebApplication1.Controllers
{
public class HomeController : Controller
{
public ActionResult Index()
{
return View();
}
[HttpPost]
public void Test()
{
Debug.WriteLine("Test was loaded");
Manager instance = new Manager();
var client = instance.StartMyTask().Result;
Debug.WriteLine("Caption: " + client.Description.Captions[0].Text);
}
}
}
提前感谢那些可以开导我的人！ ;）
编辑：Oupscode:-32000
message:No script for id: 35
'iisexpress.exe' (CLR v4.0.30319: Domain 3): Unloaded 'C:\Windows\Microsoft.Net\assembly\GAC_32\mscorlib\v4.0_4.0.0.0__b77a5c561934e089\mscorlib.dll'
'iisexpress.exe' (CLR v4.0.30319: AppInsightsDomain-0cd03d5b-6ce4-4019-ae7e-b1df44463c51): Unloaded 'C:\Windows\Microsoft.Net\assembly\GAC_32\System.Web\v4.0_4.0.0.0__b03f5f7f11d50a3a\System.Web.dll'
'iisexpress.exe' (CLR v4.0.30319: AppInsightsDomain-0cd03d5b-6ce4-4019-ae7e-b1df44463c51): Unloaded 'C:\Users\danie\AppData\Local\Temp\Temporary ASP.NET Files\vs\2f3c5b55\37cedeaf\assembly\dl3\94ecb1d3\002a8e73_afafd201\Microsoft.AI.WindowsServer.dll'
Application Insights Telemetry (unconfigured): {"name":"Microsoft.ApplicationInsights.Message","time":"2017-05-05T10:08:49.8412130Z","tags":{"ai.internal.sdkVersion":"dotnet:2.3.0-41907","ai.operation.id":"OxulrgX+fP0=","ai.location.ip":"127.0.0.1","ai.operation.syntheticSource":"SDKTelemetry","ai.cloud.roleInstance":"DESKTOP-TE2K4KD","ai.operation.name":"GET /","ai.operation.parentId":"OxulrgX+fP0="},"data":{"baseType":"MessageData","baseData":{"ver":2,"message":"AI: Diagnostic message: Performance counters are unavailable when the application is running under IIS Express. Use EnableIISExpressPerformanceCounters element with a value of 'true' within the Performance Collector Module element to override this behavior."}}}
Test was loaded
Task started
processing
Application Insights Telemetry (unconfigured): {"name":"Microsoft.ApplicationInsights.Dev.RemoteDependency","time":"2017-05-05T10:08:51.1478126Z","tags":{"ai.internal.sdkVersion":"rddf:2.3.0-1223","ai.internal.nodeName":"DESKTOP-TE2K4KD","ai.operation.id":"F5d9uEXsrsw=","ai.location.ip":"::1","ai.cloud.roleInstance":"DESKTOP-TE2K4KD","ai.operation.name":"GET Home/Index","ai.operation.parentId":"F5d9uEXsrsw="},"data":{"baseType":"RemoteDependencyData","baseData":{"ver":2,"name":"/vision/v1.0/analyze","id":"LikCUv5jYNQ=","data":"https://westus.api.cognitive.microsoft.com/vision/v1.0/analyze?visualFeatures=Adult,Categories,Color,Description,Faces,ImageType,Tags&subscription-key=d29a6dad583544d385357110f86d0ea4","duration":"00:00:04.4499171","resultCode":"200","success":true,"type":"Http","target":"westus.api.cognitive.microsoft.com","properties":{"DeveloperMode":"true"}}}}
The program '[17736] chrome.exe: WebKit' has exited with code -1 (0xffffffff).
The program '[5428] iisexpress.exe' has exited with code -1 (0xffffffff).
编辑2：
不知道它是否非常微妙，但实际上当你同步而不是异步地执行这些方法时它会起作用。
答案 0 :(得分：0)
如果您正在调用async方法，则还应该使用控制器方法async。你的方法也应该真正返回某些东西 ......
e.g。
[HttpPost]
public async Task<ActionResult> Test()
{
Debug.WriteLine("Test was loaded");
Manager instance = new Manager();
var client = await instance.StartMyTask();
return Content("Caption: " + client.Description.Captions[0].Text);
}
答案 1 :(得分：0)
如果使用Task<>，您应该尝试一直使用异步，以避免像.Result或.Wait()这样的异步/等待和阻止调用导致死锁的情况。 / p>
测试可以转换为异步。
namespace ImageTests
{
[TestClass]
public class UnitTest1 {
[TestMethod]
public async Task TestImagefromURL() {
Debug.WriteLine("Test was loaded");
var instance = new Manager();
var client = instance.StartMyTask();
Debug.WriteLine("Caption: " + client.Description.Captions[0].Text);
}
}
}
Asp.Net MVC在其框架内广泛使用async Task。这意味着你要么一直是同步的，要么就是你的行为一直异步。混合它们会产生不良影响。
public class HomeController : Controller {
public ActionResult Index() {
return View();
}
[HttpPost]
public async Task<ActionResult> Test() {
Debug.WriteLine("Test was loaded");
var instance = new Manager();
var client = await instance.StartMyTask();
var msg = "Caption: " + client.Description.Captions[0].Text;
Debug.WriteLine(msg);
return Json(msg, JsonRequestBehavior.AllowGet);
}
}