C# BinaryReader 无法访问已关闭的文件

Question

Controller :

private readonly Dictionary<string, Stream> streams;

        public ActionResult Upload(string qqfile, string id)
        {
            string filename;
            try
            {
                Stream stream = this.Request.InputStream;
                if (this.Request.Files.Count > 0)
                {
                    // IE
                    HttpPostedFileBase postedFile = this.Request.Files[0];
                    stream = postedFile.InputStream;
                }
                else
                {
                    stream = this.Request.InputStream;
                }

                filename = this.packageRepository.AddStream(stream, qqfile);
            }
            catch (Exception ex)
            {
                return this.Json(new { success = false, message = ex.Message }, "text/html");
            }

            return this.Json(new { success = true, qqfile, filename }, "text/html");
        }

添加流的方法:

        public string AddStream(Stream stream, string filename)
        {

            if (string.IsNullOrEmpty(filename))
            {
                return null;
            }

            string fileExt = Path.GetExtension(filename).ToLower();
            string fileName = Guid.NewGuid().ToString();
            this.streams.Add(fileName, stream);
        }

我正在尝试像这样读取二进制流:

Stream stream;
            if (!this.streams.TryGetValue(key, out stream))
            {
                return false;
            }

    private const int BufferSize = 2097152;

                            using (var binaryReader = new BinaryReader(stream))
                            {
                                int offset = 0;
                                binaryReader.BaseStream.Position = 0;
                                byte[] fileBuffer = binaryReader.ReadBytes(BufferSize); // THIS IS THE LINE THAT FAILS
    ....

当我在 Debug模式下查看流时，它显示它可以是 read = true、seek = true、lenght = 903234 等。

但我不断收到:无法访问已关闭的文件

当我在本地运行 mvc 站点/ Debug模式 (VS IIS) 时，这工作正常，但在“发布”模式下(当站点发布到 iis 时)不工作。

我做错了什么？

Answer 1

在这里找到解决方案:

uploading file exception

解决方法:

在生产环境中添加"requestLengthDiskThreshold"

<system.web>
<httpRuntime executionTimeout="90" maxRequestLength="20000" useFullyQualifiedRedirectUrl="false" requestLengthDiskThreshold="8192"/>
</system.web>