Question

我遵循此tutorial从Azure Blob存储上传/下载blob。

在我实施承载令牌认证（OAuth）

之前，该代码完美运行

我从邮递员上传任何文件时遇到错误。以下是错误说明。

{ “消息”：“发生了错误。详细信息：索引超出范围。必须是非负数且小于集合。\ r \ nParameter name：index“}

但是，文件已成功上传到我的Blob帐户中。但是，我仍然不断出现错误。

我附上了调试时获得的错误详细信息的图像。

我在上传控制器中提示错误的区域

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

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

我的AzureStorageMultipartFormDataStreamProvider类继承自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();         
        }

为了实现Oauth2.0身份验证，我刚刚在我的项目中添加了Startup .cs和Startup.Auth.cs（带有所需的NuGet包 Owin ）

这是我的StackTrace

System.ThrowHelper.ThrowArgumentOutOfRangeException（ExceptionArgument参数，ExceptionResource资源），位于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（） ---在抛出异常的前一个位置的堆栈跟踪结束---在System.Runtime的System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification（任务任务）的System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess（任务任务）处。 CompilerServices.TaskAwaiter`1.GetResult（）在DemoAzureStorage.Controllers.UploadController.d__1.MoveNext（）

Answer 1

根据你的描述，我已经创建了一个测试演示（所有已安装的软件包都是最新的），它运行良好。

我使用了带谷歌登录的asp.net web api和AzureStorageMultipartFormDataStreamProvider作为你的节目。

我的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，您可以创建一个测试项目并将其推送到github或一个驱动器，以便我们重现您的问题。

Packages.config：

<?xml version="1.0" encoding="utf-8"?>
<packages>
  <package id="Antlr" version="3.4.1.9004" targetFramework="net46" />
  <package id="bootstrap" version="3.0.0" targetFramework="net46" />
  <package id="EntityFramework" version="6.1.3" targetFramework="net46" />
  <package id="jQuery" version="1.10.2" targetFramework="net46" />
  <package id="Knockout.Validation" version="1.0.1" targetFramework="net46" />
  <package id="knockoutjs" version="2.3.0" targetFramework="net46" />
  <package id="Microsoft.ApplicationInsights" version="2.2.0" targetFramework="net46" />
  <package id="Microsoft.ApplicationInsights.Agent.Intercept" version="2.0.6" targetFramework="net46" />
  <package id="Microsoft.ApplicationInsights.DependencyCollector" version="2.2.0" targetFramework="net46" />
  <package id="Microsoft.ApplicationInsights.PerfCounterCollector" version="2.2.0" targetFramework="net46" />
  <package id="Microsoft.ApplicationInsights.Web" version="2.2.0" targetFramework="net46" />
  <package id="Microsoft.ApplicationInsights.WindowsServer" version="2.2.0" targetFramework="net46" />
  <package id="Microsoft.ApplicationInsights.WindowsServer.TelemetryChannel" version="2.2.0" targetFramework="net46" />
  <package id="Microsoft.AspNet.Identity.Core" version="2.2.1" targetFramework="net46" />
  <package id="Microsoft.AspNet.Identity.EntityFramework" version="2.2.1" targetFramework="net46" />
  <package id="Microsoft.AspNet.Identity.Owin" version="2.2.1" targetFramework="net46" />
  <package id="Microsoft.AspNet.Mvc" version="5.2.3" targetFramework="net46" />
  <package id="Microsoft.AspNet.Razor" version="3.2.3" targetFramework="net46" />
  <package id="Microsoft.AspNet.Web.Optimization" version="1.1.3" targetFramework="net46" />
  <package id="Microsoft.AspNet.WebApi" version="5.2.3" targetFramework="net46" />
  <package id="Microsoft.AspNet.WebApi.Client" version="5.2.3" targetFramework="net46" />
  <package id="Microsoft.AspNet.WebApi.Core" version="5.2.3" targetFramework="net46" />
  <package id="Microsoft.AspNet.WebApi.HelpPage" version="5.2.3" targetFramework="net46" />
  <package id="Microsoft.AspNet.WebApi.Owin" version="5.2.3" targetFramework="net46" />
  <package id="Microsoft.AspNet.WebApi.WebHost" version="5.2.3" targetFramework="net46" />
  <package id="Microsoft.AspNet.WebPages" version="3.2.3" targetFramework="net46" />
  <package id="Microsoft.Azure.KeyVault.Core" version="1.0.0" targetFramework="net46" />
  <package id="Microsoft.CodeDom.Providers.DotNetCompilerPlatform" version="1.0.5" targetFramework="net46" />
  <package id="Microsoft.Data.Edm" version="5.8.2" targetFramework="net46" />
  <package id="Microsoft.Data.OData" version="5.8.2" targetFramework="net46" />
  <package id="Microsoft.Data.Services.Client" version="5.8.2" targetFramework="net46" />
  <package id="Microsoft.Net.Compilers" version="2.1.0" targetFramework="net46" developmentDependency="true" />
  <package id="Microsoft.Owin" version="3.0.1" targetFramework="net46" />
  <package id="Microsoft.Owin.Host.SystemWeb" version="3.0.1" targetFramework="net46" />
  <package id="Microsoft.Owin.Security" version="3.0.1" targetFramework="net46" />
  <package id="Microsoft.Owin.Security.Cookies" version="3.0.1" targetFramework="net46" />
  <package id="Microsoft.Owin.Security.Facebook" version="3.0.1" targetFramework="net46" />
  <package id="Microsoft.Owin.Security.Google" version="3.0.1" targetFramework="net46" />
  <package id="Microsoft.Owin.Security.MicrosoftAccount" version="3.0.1" targetFramework="net46" />
  <package id="Microsoft.Owin.Security.OAuth" version="3.0.1" targetFramework="net46" />
  <package id="Microsoft.Owin.Security.Twitter" version="3.0.1" targetFramework="net46" />
  <package id="Microsoft.Web.Infrastructure" version="1.0.0.0" targetFramework="net46" />
  <package id="Modernizr" version="2.6.2" targetFramework="net46" />
  <package id="Newtonsoft.Json" version="6.0.8" targetFramework="net46" />
  <package id="Owin" version="1.0" targetFramework="net46" />
  <package id="Respond" version="1.2.0" targetFramework="net46" />
  <package id="Sammy.js" version="0.7.4" targetFramework="net46" />
  <package id="System.ComponentModel.EventBasedAsync" version="4.0.11" targetFramework="net46" />
  <package id="System.Dynamic.Runtime" version="4.0.0" targetFramework="net46" />
  <package id="System.Linq.Queryable" version="4.0.0" targetFramework="net46" />
  <package id="System.Net.Requests" version="4.0.11" targetFramework="net46" />
  <package id="System.Spatial" version="5.8.2" targetFramework="net46" />
  <package id="WebGrease" version="1.5.2" targetFramework="net46" />
  <package id="WindowsAzure.Storage" version="8.5.0" targetFramework="net46" />
</packages>

“索引超出范围”等待Request.Content.ReadAsMultipartAsync（提供程序）时出错

1 个答案: