System.IO.FileNotFoundException：无法找到上载的文件

Question

We have 2 web servers providing load balance service. Each IIS host has a temporary folder D:\\Website\\PTSMAM\\UploadFolder\\ to placed uploaded file. When user submit to upload a file, it will upload file to UploadFolder, then move the uploaded file to a permanent storage. It happened that if user's request is direct to Server1, it got the following exception

System.IO.FileNotFoundException: Could not find file 'D:\\Website\\PTSMAM\\UploadFolder\\G201323200010081.txt'. File name: 'D:\\Website\\PTSMAM\\UploadFolder\\G201323200010081.txt' at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)
at System.IO.File.Move(String sourceFileName, String destFileName)
at PTS_MAM3.Web.DataSource.WSARCHIVE.fileMove(ClassUploadFileClass x, String scase) in E:\\PTSMAM_Source\\PTS_MAM\\PTS_MAM3.Web\\DataSource\\WSARCHIVE.asmx.cs:line 1655

But the file "D:\\Website\\PTSMAM\\UploadFolder\\G201323200010081.txt" exist in its folder.

If i do the upload job in Server2, it works fine. Why is that? Is it possible that Server1:D:\\Website\\PTSMAM\\UploadFolder and Server2:D:\\Website\\PTSMAM\\UploadFolder may differ?

Following is the source code. I think the exception is induced by System.IO.File.Move(fileFrom, fileDest);

    private bool fileMove(ClassUploadFileClass x, string scase)
    {
        string fileFrom = string.Empty;
        string fileFromV = string.Empty;
        string fileDest = x.strDirectory;
        //string fileDest2 = string.Concat(System.IO.Path.GetDirectoryName(fileDest), @"\", System.IO.Path.GetFileNameWithoutExtension(fileDest), "_M", System.IO.Path.GetExtension(fileDest));
        string fileDest2 = string.Concat(System.IO.Path.GetDirectoryName(fileDest), @"\", System.IO.Path.GetFileNameWithoutExtension(fileDest), "_M.jpg");
        string TempDir = Server.MapPath("/") + @"UploadFolder\";
        //MAM_PTS_DLL.SysConfig obj = new MAM_PTS_DLL.SysConfig();
        //string dirPhoto = obj.sysConfig_Read("/ServerConfig/STO_Config/UPLOAD_FOLDER_PHOTO");
        //string dirDoc = obj.sysConfig_Read("/ServerConfig/STO_Config/UPLOAD_FOLDER_DOC");
        //string dirAudio = obj.sysConfig_Read("/ServerConfig/STO_Config/UPLOAD_FOLDER_AUDIO");

        try
        {
            //MAM_PTS_DLL.Log.AppendTrackingLog("WSARchive/fileMove", MAM_PTS_DLL.Log.TRACKING_LEVEL.INFO, "Path = " + fileDest);// + @"\" + x.strFileId + "." + x.strOExtensionName);
            switch (scase)
            {
                case ("Photo"):
                    fileFrom = string.Concat(TempDir, x.strFileId, ".", x.strOExtensionName);//@"\\10.13.220.2\uploadfolder\Pictures\"
                    //fileFromV = string.Concat(TempDir, x.strFileId, "_M.", x.strOExtensionName);//@"\\10.13.220.2\uploadfolder\Pictures\"
                    fileFromV = string.Concat(TempDir, x.strFileId, "_M.jpg");
                    break;
                case ("Audio"):
                    fileFrom = string.Concat(TempDir, x.strFileId, ".", x.strOExtensionName);//@"\\10.13.220.2\uploadfolder\Audios\"
                    break;
                case ("Doc"):
                    fileFrom = string.Concat(TempDir, x.strFileId, ".", x.strOExtensionName);
                    break;
                case ("LowVideo"):
                    fileFrom = string.Concat(TempDir, x.strFileId, ".", x.strOExtensionName);
                    break;
            }

            string dirPath = System.IO.Path.GetDirectoryName(fileDest);
            if (!System.IO.Directory.Exists(dirPath))
                System.IO.Directory.CreateDirectory(dirPath);
            System.IO.File.Move(fileFrom, fileDest);        // + @"\" + x.strFileId + "." + x.strOExtensionName);

            if (scase == "Photo")
                System.IO.File.Move(fileFromV, fileDest2);

            return true;
        }
        catch (Exception ex)
        {
            MAM_PTS_DLL.Log.AppendTrackingLog("File Move Problem", MAM_PTS_DLL.Log.TRACKING_LEVEL.ERROR, x.strOFileName + ",ex = " + ex.ToString());
            return false;
        }

    }

Answer 1

Look at the permissions of the folder. Does the IIS application pool user has access to it (read/write)? If you can, try login as the application pool user and the look at the folder.

Answer 2

Assuming the file exists and you checked that it does exists.

1. Right click the folder D:\\Website\\PTSMAM\\UploadFolder
2. Click on properties and then Security Tab.
3. The Click on edit button
4. Then Click on add button
5. Then add user IIS_IUSRS (checkbox full control should be checked) and then click OK

The problem should be fixed now.

Note Giving full control is not recommended, so you have to decide on what permission needed, if you have security concerns.

Other issue can be since you are using different drive ( D:\\Website\\PTSMAM\\UploadFolder ) the code string TempDir = Server.MapPath("/") + @"UploadFolder\\"; will not find correct path

Server.MapPath will start finding from the folder which is used to host the web application.