由于 FileStream.Create UnauthorizedAccessException 正在寻找解决方法

Question

我正在使用 FileStream.Create 将 .csv 文件上传到服务器，然后将其读入 SQL 数据库。读入后，我只需从写入文件的文件夹中删除文件。目标是将文件放入数据库。这在本地运行很好，但我无法在新服务器上获得写入权限，所以我得到了 UnauthorizedAccessException。我认为没有必要将文件上传到服务器以将其读入 SQL table，但我在调整代码时遇到了问题。

[HttpPost]
    public ActionResult UploadValidationTable(HttpPostedFileBase csvFile)
    {
        var inputFileDescription = new CsvFileDescription
        {
            SeparatorChar = ',',
            FirstLineHasColumnNames = true
        };
        var cc = new CsvContext();
        var filePath = uploadFile(csvFile.InputStream);
        var model = cc.Read<Credit>(filePath, inputFileDescription);

        try
        {
            var entity = new Entities();
            foreach (var item in model)
            {
                var tc = new TemporaryCsvUpload
                {
                    Id = item.Id,
                    Amount = item.Amount,
                    Date = item.Date,
                    Number = item.Number,
                    ReasonId = item.ReasonId,
                    Notes = item.Notes
                };
                entity.TemporaryCsvUploads.Add(tc);
            }
            entity.SaveChanges();

            System.IO.File.Delete(filePath);

上传文件方法如下：

        private string uploadFile(Stream serverFileStream)
    {
        const string directory = "~/Content/CSVUploads";

        var directoryExists = Directory.Exists(Server.MapPath(directory));

        if (!directoryExists)
        {
            Directory.CreateDirectory(Server.MapPath(directory));
        }

        var targetFolder = Server.MapPath(directory);
        var filename = Path.Combine(targetFolder, Guid.NewGuid() + ".csv");

        try
        {
            const int length = 256;
            var buffer = new byte[length];

            // write the required bytes
            using (var fs = new FileStream(filename, FileMode.Create))
            {
                int bytesRead;
                do
                {
                    bytesRead = serverFileStream.Read(buffer, 0, length);
                    fs.Write(buffer, 0, bytesRead);
                } while (bytesRead == length);
            }

            serverFileStream.Dispose();
            return filename;
        }
        catch (Exception)
        {
            return string.Empty;
        }
    }

总而言之，我正在将一个 .csv 文件上传到一个临时位置，将其读入对象，将其读入数据库，然后从临时位置删除 .csv 文件。我正在使用 Linq2Csv 创建对象。我可以在不将文件上传到服务器的情况下执行此操作吗（因为我无法获得写入权限）？

Answer 1

根据http://www.codeproject.com/Articles/25133/LINQ-to-CSV-library，

您可以从 StreamReader 读取

Read<T>(StreamReader stream)
Read<T>(StreamReader stream, CsvFileDescription fileDescription)

您或许可以使用 streamreader（或 stringbuilder）来创建您的文件，而不是 csv - Write StringBuilder to Stream

How to take a stringbuilder and convert it to a streamReader?

然后将其发送到您的 CSVContext？

由于 FileStream.Create UnauthorizedAccessException 正在寻找解决方法

Looking for workaround due to FileStream.Create UnauthorizedAccessException

c#

csv

asp.net-mvc

filestream