public void HandleUploadFiles(HttpFileCollectionBase files, Int64 id)
{
foreach (string file in Request.Files)
{
var fileDataContent = Request.Files[file];
var stream = fileDataContent.InputStream;
var fileName = Path.GetFileName(fileDataContent.FileName);
var uploadPath = Server.MapPath("~/App_Data/uploads");
if (!FileHelper.ExistDirectory(uploadPath))
{
FileHelper.CreateDirectory(uploadPath);
}
var path = Path.Combine(uploadPath, fileName);
//使用瞬态故障处理库Polly处理异常，采用等待重试策略
PollyHelper.WaitAndRetry <IOException>(() =>
{
if (FileHelper.Exist(path))
{
FileHelper.Delete(path);
}
using (var fileStream = System.IO.File.Create(path))
{
stream.CopyTo(fileStream);
}
// 当上传中断，已上传部分是否能合并？（待优化）
var ut = new Utils();
var storeFileName = string.Empty;
var result = false;
//Merge file
ut.MergeFile(path, out result, out storeFileName);
if (result)
{
var model = bookRepository.GetById(id);
model.Url = storeFileName;
bookRepository.Update(model);
unitOfWork.Commit();
}
});
}
}
public bool MergeFile(string fileName, out bool result, out string storeFileName)
{
result = false;
storeFileName = string.Empty;
var fileNamePartToken = fileName.IndexOf(PARTTOKEN);
var baseFileName = fileName.Substring(0, fileNamePartToken);
var trailingTokens = fileName.Substring(fileNamePartToken + PARTTOKEN.Length);
var fileIndex = 0;
var fileCount = 0;
int.TryParse(trailingTokens.Substring(0, trailingTokens.IndexOf(".")), out fileIndex);
int.TryParse(trailingTokens.Substring(0, trailingTokens.IndexOf(".")), out fileCount);
var searchPattern = Path.GetFileName(baseFileName) + PARTTOKEN + "*";
var filesList = FileHelper.GetFiles(Path.GetDirectoryName(fileName), searchPattern);
if (filesList.Count() == fileCount)
{
var extensionName = FileHelper.GetExtensionName(baseFileName);
storeFileName = FileHelper.GetFileNameWithoutExtension(baseFileName) + extensionName;
}
if (!MergeFileSingleton.Instance.InUse(baseFileName))
{
MergeFileSingleton.Instance.AddFile(baseFileName);
if (FileHelper.Exist(baseFileName))
{
FileHelper.Delete(baseFileName);
}
var mergeList = new List <SortedFile>();
foreach (var file in filesList)
{
var sortedFile = new SortedFile
{
FileName = file
};
baseFileName = file.Substring(0, file.IndexOf(PARTTOKEN));
trailingTokens = file.Substring(file.IndexOf(PARTTOKEN) + PARTTOKEN.Length);
int.TryParse(trailingTokens.Substring(0, trailingTokens.IndexOf(".")), out fileIndex);
sortedFile.FileOrder = fileIndex;
mergeList.Add(sortedFile);
}
var mergeOrder = mergeList.OrderBy(s => s.FileOrder).ToList();
using (var fileStream = new FileStream(baseFileName, FileMode.Create))
{
try
{
foreach (var chunk in mergeOrder)
{
PollyHelper.WaitAndRetry <IOException>(() =>
{
using (var fileChunk = new FileStream(chunk.FileName, FileMode.Open))
{
fileChunk.CopyTo(fileStream);
}
});
}
}
catch (IOException e)
{
return(false);
throw e;
}
}
result = true;
MergeFileSingleton.Instance.RemoveFile(baseFileName);
Parallel.ForEach(mergeList, (d) => { FileHelper.Delete(d.FileName); });
}
return(result);
}
