Bot中的MS Bot c＃自定義視覺預測端點錯誤“不支持給定路徑的格式。”

Question

已創建了一個演示自定義視覺對象檢測的簡單項目。 一切都很好。 但是問題出在我通過Bot聊天附加圖片時，它引發了免責聲明

The given path’s format is not supported...
at System.Security.Permissions.FileIOPermission.EmulateFileIOPermissionChecks(String fullPath)
at System.IO.FileStream.Init(String path, FileMode mode, FileAccess access, Int32 rights, Boolean useRights, FileShare

這是完整的代碼...

 public class Vision:IDialog<Object>
 {
     Guid ProjectId = Guid.Empty;

     const string PredictionKey = "<MY KEY>";

     public Task StartAsync(IDialogContext context)
     {
         context.Wait(MessageReceivedAsync);

         return Task.CompletedTask;
     }

     private async Task MessageReceivedAsync(IDialogContext context, IAwaitable<object> result)
     {
         await context.PostAsync("Hello there. Nice to meet you!");
         context.Wait(ResumeAfterOperationSelecting);

     }

     private async Task ResumeAfterOperationSelecting(IDialogContext context, IAwaitable<object> result)
     {
         PromptDialog.Attachment(
             context: context,
             prompt: "Upload Image to perform operation",
             resume: ResumeAfterRecievingAttachment
         );
     }

     private async Task ResumeAfterRecievingAttachment(IDialogContext context, IAwaitable<IEnumerable<Attachment>> result)
     {
         var images = await result;

         foreach (var image in images)
         {
             ProjectId = new Guid("<MY PROJECT ID>");

             PredictionEndpoint endpoint = new PredictionEndpoint() { ApiKey = PredictionKey };

             var results = endpoint.PredictImage(ProjectId, File.OpenRead(image.ContentUrl));

             foreach (var c in results.Predictions)
             {
                 await context.PostAsync($"{c.TagName}, {c.Probability}");
             }

         }
         await context.PostAsync("Hello there. Have done!");

         context.Wait(MessageReceivedAsync);
     }

}

所以錯誤發生在這條線上

var results = endpoint.PredictImage(ProjectId, File.OpenRead(image.ContentUrl));

這是完整的免稅信息

 The given path’s format is not supported.     
 at System.Security.Permissions.FileIOPermission.EmulateFileIOPermissionChecks(String  fullPath)
 at System.IO.FileStream.Init(String path, FileMode mode, FileAccess access, Int32 rights, Boolean useRights, FileShare share, Int32 bufferSize, FileOptions options, SECURITY_ATTRIBUTES secAttrs, String msgPath, Boolean bFromProxy, Boolean useLongPath, Boolean checkHost)
 at System.IO.FileStream…ctor(String path, FileMode mode, FileAccess access, FileShare share)
 at SimpleEchoBot.Dialogs.Vision.<ResumeAfterRecievingAttachment>d__5.MoveNext()
 in C:\Users\AbdiHakim\Music\reres-src\Dialogs\Vision.cs:line 55
 — End of stack trace from previous location where exception was thrown —
 at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
 at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
 at Microsoft.Bot.Builder.Dialogs.Internals.DialogTask.ThunkResume1.<Rest>d__5.MoveNext()
 in D:\a\1\s\CSharp\Library\Microsoft.Bot.Builder\Dialogs\DialogTask.cs:line 164 --- End of stack trace from previous location where exception was thrown --- 
 at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) 
 at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) 
 at Microsoft.Bot.Builder.Internals.Fibers.Wait2.<Microsoft-Bot-Builder-Internals-Fibers-IWait<C>-PollAsync>d__19.MoveNext()
 in D:\a\1\s\CSharp\Library\Microsoft.Bot.Builder\Fibers\…

我應該用這條線做什么。 根據我的觀點，由於Microsoft Bot Framework可能不允許System.IO實現文件映像附件。 如果是這樣，我該如何實現它，以便預測點URL可以讀取機器人附件的圖像URL。

 NOTE: Prediction endpoint requires the method to have format like this.. 

endpoint.Prediction（，）

Json Bot Framework Emulator的輸出是這個

 "type": "message",
  "attachments": [
    {
      "contentType": "image/jpeg",
      "contentUrl": "blob:file:///a3f2d3e1-e295-46fe-b434-b05f3905301c",
      "name": "11.jpg"
    }
  ],

Answer 1

我也不知道您的URL也指向哪種文件（Azure Blob存儲？）。 消息很清楚-File.OpenRead不支持您嘗試訪問blob：file：//的文件類型。

https://msdn.microsoft.com/en-us/library/system.io.file.openread(v=vs.110).aspx

這是來自MSDN的可接受路徑的列表：

在接受路徑的成員中，該路徑可以引用文件或僅引用目錄。 指定的路徑還可以引用服務器和共享名的相對路徑或通用命名約定（UNC）路徑。 例如，以下所有都是可接受的路徑：

在C＃中為“ c：\\ MyDir \\ MyFile.txt”，在Visual Basic中為“ c：\\ MyDir \\ MyFile.txt”。

在C＃中為“ c：\\ MyDir”，在Visual Basic中為“ c：\\ MyDir”。

在C＃中為“ MyDir \\ MySubdir”，在Visual Basic中為“ MyDir \\ MySubDir”。

在C＃中為“ \\\\ MyServer \\ MyShare”，在Visual Basic中為“ \\ MyServer \\ MyShare”。