“索引超出范围”等待时发生错误Request.Content.ReadAsMultipartAsync（provider）

Question

我按照此tutorial从Azure Blob存储上传/下载Blob。下面

代码工作完美，直到我实现了承载令牌认证（OAuth的）

我已经上载从postman.The任何文件得到了错误的错误描述。

{ “消息”：“发生了错误的细节：。索引超出范围必须大于 集合的大小非负少\ r \ n参数名称索引：”}

但是，这些文件已成功上传到我的Blob帐户中，但仍然出现错误。

我附上了调试时获得的错误详细信息的图像。

在那里我已经提示错误在我上传控制器

try 
      { 
       await Request.Content.ReadAsMultipartAsync(provider); 

      } 
      catch (Exception ex) 
      { 
       return BadRequest($"An error has occured. Details: {ex.Message}"); 
      } 

我AzureStorageMultipartFormDataStreamProvider类，这是从MultipartFormDataStreamProvider

public override Stream GetStream(HttpContent parent, HttpContentHeaders headers) 
     { 


       if (parent == null) throw new ArgumentNullException(nameof(parent)); 
       if (headers == null) throw new ArgumentNullException(nameof(headers)); 


      // Generate a new filename for every new blob 

      var fileName = Guid.NewGuid().ToString(); 
      CloudBlockBlob blob = _blobContainer.GetBlockBlobReference(fileName); 
      headers.ContentLength = 0; 

      if (headers.ContentType != null) 
       { 
        // Set appropriate content type for your uploaded file 
        blob.Properties.ContentType = headers.ContentType.MediaType; 
       } 

       this.FileData.Add(new MultipartFileData(headers, blob.Name)); 

       return blob.OpenWrite();   
     } 

继承对于实施的oauth2区域。 0身份验证我刚刚在我的项目中添加了启动.cs和Startup.Auth.cs（使用re quired的NuGet包Owin）

这里是我的堆栈跟踪

在System.ThrowHelper.ThrowArgumentOutOfRangeException（ExceptionArgument说法，ExceptionResource资源）在System.Collections.Generic.List 1.get_Item(Int32 index) at System.Net.Http.MultipartFormDataStreamProvider.<ExecutePostProcessingAsync>d__0.MoveNext() --- 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 System.Net.Http.HttpContentMultipartExtensions.<ReadAsMultipartAsync>d__0 1.MoveNext（） - - 从抛出异常的以前位置结束堆栈跟踪---在System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess（任务任务）上System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification（任务任务）在System.Runtime.CompilerServices .TaskAwaiter`1.GetResult（） 在DemoAzureStorage.Controllers.UploadController.d__1.MoveNext（）

Answer 1

根据你的描述，我创建了一个测试演示（所有已安装包是最新的一个）在我的身边，它工作得很好。

我用谷歌登录和AzureStorageMultipartFormDataStreamProvider作为您的节目使用asp.net web api。

我上传文件控制器代码如下：

public class UploadController : ApiController 
{ 
    private const string Container = "mycontainer"; 

    [HttpPost] 
    public async Task<IHttpActionResult> UploadFile() 
    { 
     if (!Request.Content.IsMimeMultipartContent("form-data")) 
     { 
      throw new HttpResponseException(HttpStatusCode.UnsupportedMediaType); 
     } 


     var storageAccount = CloudStorageAccount.Parse("connection string"); 
     CloudBlobClient blobClient = storageAccount.CreateCloudBlobClient(); 

     CloudBlobContainer imagesContainer = blobClient.GetContainerReference(Container); 
     var provider = new AzureStorageMultipartFormDataStreamProvider(imagesContainer); 

     try 
     { 
      await Request.Content.ReadAsMultipartAsync(provider); 
     } 
     catch (Exception ex) 
     { 
      return BadRequest($"An error has occured. Details: {ex.Message}"); 
     } 

     // Retrieve the filename of the file you have uploaded 
     var filename = provider.FileData.FirstOrDefault()?.LocalFileName; 
     if (string.IsNullOrEmpty(filename)) 
     { 
      return BadRequest("An error has occured while uploading your file. Please try again."); 
     } 

     return Ok($"File: {filename} has successfully uploaded"); 
    } 
} 

AzureStorageMultipartFormDataStreamProvider类：

public class AzureStorageMultipartFormDataStreamProvider : MultipartFormDataStreamProvider 
{ 
    private readonly CloudBlobContainer _blobContainer; 
    private readonly string[] _supportedMimeTypes = { "image/png", "image/jpeg", "image/jpg" }; 

    public AzureStorageMultipartFormDataStreamProvider(CloudBlobContainer blobContainer) : base("azure") 
    { 
     _blobContainer = blobContainer; 
    } 

    public override Stream GetStream(HttpContent parent, HttpContentHeaders headers) 
    { 
     if (parent == null) throw new ArgumentNullException(nameof(parent)); 
     if (headers == null) throw new ArgumentNullException(nameof(headers)); 

     if (!_supportedMimeTypes.Contains(headers.ContentType.ToString().ToLower())) 
     { 
      throw new NotSupportedException("Only jpeg and png are supported"); 
     } 

     // Generate a new filename for every new blob 
     var fileName = Guid.NewGuid().ToString(); 

     CloudBlockBlob blob = _blobContainer.GetBlockBlobReference(fileName); 

     if (headers.ContentType != null) 
     { 
      // Set appropriate content type for your uploaded file 
      blob.Properties.ContentType = headers.ContentType.MediaType; 
     } 

     this.FileData.Add(new MultipartFileData(headers, blob.Name)); 

     return blob.OpenWrite(); 
    } 

结果如下图所示：

如果可能的话，你可以创建一个测试项目并推送到github或一个驱动器，我们重现您的问题。

Packages.config：

<?xml version="1.0" encoding="utf-8"?> 
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