本文介绍了通过Web API ASP.NET Framework Web应用程序C#将图像/文件上传到Blob Azure的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
在尝试将图片上传到blob时使用邮递员测试api时获得http 400:
Getting http 400, when trying to upload an image to blob, using postman to test the api:
[Route("~/api/myAPI/testapi")]
[HttpPost]
public async Task<HttpResponseMessage> testapi()
{
String strorageconn = System.Configuration.ConfigurationManager.AppSettings.Get("MyBlobStorageConnectionString");
Dictionary<string, object> dict = new Dictionary<string, object>();
try
{
// Create a CloudStorageAccount object using account name and key.
// The account name should be just the name of a Storage Account, not a URI, and
// not including the suffix. The key should be a base-64 encoded string that you
// can acquire from the portal, or from the management plane.
// This will have full permissions to all operations on the account.
// StorageCredentials storageCredentials = new StorageCredentials(myAccountName, myAccountKey);
//CloudStorageAccount cloudStorageAccount = new CloudStorageAccount(storageCredentials, useHttps: true);
// Parse the connection string and return a reference to the storage account.
CloudStorageAccount storageAccount = CloudStorageAccount.Parse(strorageconn);
// If the connection string is valid, proceed with operations against Blob
// storage here.
// ADD OTHER OPERATIONS HERE
// Create the CloudBlobClient that represents the
// Blob storage endpoint for the storage account.
CloudBlobClient cloudBlobClient = storageAccount.CreateCloudBlobClient();
// Create a container called 'quickstartblobs' and
// append a GUID value to it to make the name unique.
CloudBlobContainer cloudBlobContainer = cloudBlobClient.GetContainerReference("images");
//"quickstartblobs" + Guid.NewGuid().ToString());
await cloudBlobContainer.CreateAsync();
if (cloudBlobContainer.CreateIfNotExists())
{
cloudBlobContainer.SetPermissions(
new BlobContainerPermissions
{
PublicAccess = BlobContainerPublicAccessType.Blob
});
}
// Set the permissions so the blobs are public.
/* BlobContainerPermissions permissions = new BlobContainerPermissions
{
PublicAccess = BlobContainerPublicAccessType.Blob
};
await cloudBlobContainer.SetPermissionsAsync(permissions); */
// Create a CloudBlobClient object from the storage account.
// This object is the root object for all operations on the
// blob service for this particular account.
//CloudBlobClient blobClient = cloudStorageAccount.CreateCloudBlobClient();
var httpRequest = HttpContext.Current.Request;
foreach (string file in httpRequest.Files)
{
HttpResponseMessage response = Request.CreateResponse(HttpStatusCode.Created);
var postedFile = httpRequest.Files[file];
// Get a reference to a CloudBlobContainer object in this account.
// This object can be used to create the container on the service,
// list blobs, delete the container, etc. This operation does not make a
// call to the Azure Storage service. It neither creates the container
// on the service, nor validates its existence.
string imageName = "images" +serverTime.Year.ToString() + serverTime.Month.ToString() + serverTime.Day.ToString() +
serverTime.Hour.ToString() + serverTime.Minute.ToString() + serverTime.Second.ToString ()
+ postedFile.FileName.ToLower();
//CloudBlobContainer container = blobClient.GetContainerReference(imageName.ToLower());
/*if(await container.CreateIfNotExistsAsync())
{
await container.SetPermissionsAsync(
new BlobContainerPermissions {
PublicAccess = BlobContainerPublicAccessType.Blob
}
);
} */
if (postedFile != null && postedFile.ContentLength > 0)
{
int MaxContentLength = 1024 * 1024 * 1; //Size = 1 MB
IList<string> AllowedFileExtensions = new List<string> { ".jpg", ".gif", ".png" };
var ext = postedFile.FileName.Substring(postedFile.FileName.LastIndexOf('.'));
var extension = ext.ToLower();
if (!AllowedFileExtensions.Contains(extension))
{
var message = string.Format("Please Upload image of type .jpg,.gif,.png.");
dict.Add("error", message);
return Request.CreateResponse(HttpStatusCode.BadRequest, dict);
}
else if (postedFile.ContentLength > MaxContentLength)
{
var message = string.Format("Please Upload a file upto 1 mb.");
dict.Add("error", message);
return Request.CreateResponse(HttpStatusCode.BadRequest, dict);
}
else
{
var filePath = HttpContext.Current.Server.MapPath("~/imagesfiles/uploads" + postedFile.FileName.ToLower() + extension.ToLower());
postedFile.SaveAs(filePath);
//CloudBlockBlob cloudBlockBlob = container.GetBlockBlobReference(imageName);
// Get a reference to the blob address, then upload the file to the blob.
// Use the value of localFileName for the blob name.
CloudBlockBlob cloudBlockBlob = cloudBlobContainer.GetBlockBlobReference(imageName.ToLower());
// create a blob in container and upload image bytes to it
//var blob =container.GetBlobReference(postedFile.FileName);
await cloudBlockBlob.UploadFromFileAsync(postedFile.FileName);
//await cloudBlockBlob.UploadFromFileAsync(filePath);
}
}
var message1 = string.Format("Image Updated Successfully.");
return Request.CreateErrorResponse(HttpStatusCode.Created, message1); ;
}
var res = string.Format("Please Upload a image.");
dict.Add("error", res);
return Request.CreateResponse(HttpStatusCode.NotFound, dict);
}
catch (Exception ex)
{
HttpResponseMessage response2 = Request.CreateResponse(HttpStatusCode.BadRequest, ex.InnerException.ToString());
return response2;
}
}
邮递员的回复:
"System.Net.WebException: The remote server returned an error: (400) Bad Request.\r\n at Microsoft.Azure.Storage.Shared.Protocol.HttpResponseParsers.ProcessExpectedStatusCodeNoException[T](HttpStatusCode expectedStatusCode, HttpStatusCode actualStatusCode, T retVal, StorageCommandBase`1 cmd, Exception ex)\r\n at Microsoft.Azure.Storage.Blob.CloudBlobContainer.<>c_DisplayClass149_0.<CreateContainerImpl>b_2(RESTCommand`1 cmd, HttpWebResponse resp, Exception ex, OperationContext ctx)\r\n at Microsoft.Azure.Storage.Core.Executor.Executor.EndGetResponse[T](IAsyncResult getResponseResult)"
推荐答案
不确定为什么它不起作用，代码看起来正确.在许多情况下都会发生此错误.
Not sure why it does not work, the code looks correct. The error occurs in many cases.
-
如果您请求的容器名称无效，则将导致您收到(400)错误的请求.它有一些关于容器名称的限制，因此请检查您的字符串.
If you request a container with an invalid name, it will result in (400) Bad Request, which you are getting. It has some limitations about the container name, so check your string.
如果Blob存储模拟器无法启动，它将返回400 Bad Request.参见此处.
If the blob storage emulator would not start, it will return 400 Bad Request. see here.
如果存储库和存储仿真器的版本不同步，它还将返回400错误请求，请参见这里.
If the versions of the storage libraries and storage emulator are out of sync, it will also return 400 Bad Request, see here.
最后，您的存储位置可能很重要，请参见此处.
Last, the location of your storage may matter, see here.
这篇关于通过Web API ASP.NET Framework Web应用程序C#将图像/文件上传到Blob Azure的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！