/// <summary>
/// original name + ".part_N.X" (N = file part number, X = total files)
/// Objective = enumerate files in folder, look for all matching parts of split file. If found, merge and return true.
/// </summary>
/// <param name="FileName"></param>
/// <returns></returns>
public bool MergeFile(string FileName)
{
bool rslt = false;
// parse out the different tokens from the filename according to the convention
string partToken = ".part_";
string baseFileName = FileParts[0].Substring(0, FileParts[0].IndexOf(partToken));
string trailingTokens = FileParts[0].Substring(FileParts[0].IndexOf(partToken) + partToken.Length);
int FileIndex = 0;
int FileCount = 0;
int.TryParse(trailingTokens.Substring(0, trailingTokens.IndexOf(".")), out FileIndex);
int.TryParse(trailingTokens.Substring(trailingTokens.IndexOf(".") + 1), out FileCount);
// get a list of all file parts in the temp folder
string Searchpattern = Path.GetFileName(baseFileName) + partToken + "*";
string[] FilesList = Directory.GetFiles(Path.GetDirectoryName(OrignalFileName), Searchpattern);
// merge .. improvement would be to confirm individual parts are there / correctly in sequence, a security check would also be important
// only proceed if we have received all the file chunks
if (FilesList.Count() == FileCount)
{
// use a singleton to stop overlapping processes
if (!MergeFileManager.Instance.InUse(baseFileName))
{
MergeFileManager.Instance.AddFile(baseFileName);
if (File.Exists(baseFileName))
{
File.Delete(baseFileName);
}
// add each file located to a list so we can get them into
// the correct order for rebuilding the file
List <SortedFile> MergeList = new List <SortedFile>();
foreach (string File in FilesList)
{
SortedFile sFile = new SortedFile();
sFile.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);
sFile.FileOrder = FileIndex;
MergeList.Add(sFile);
}
// sort by the file-part number to ensure we merge back in the correct order
var MergeOrder = MergeList.OrderBy(s => s.FileOrder).ToList();
using (FileStream FS = new FileStream(baseFileName, FileMode.Create))
{
// merge each file chunk back into one contiguous file stream
foreach (var chunk in MergeOrder)
{
try
{
using (FileStream fileChunk = new FileStream(chunk.FileName, FileMode.Open))
{
fileChunk.CopyTo(FS);
}
}
catch (IOException ex)
{
// handle
}
}
}
rslt = true;
// unlock the file from singleton
MergeFileManager.Instance.RemoveFile(baseFileName);
}
}
foreach (var filePart in FileParts)
{
if (File.Exists(filePart))
{
File.Delete(filePart);
}
}
return(rslt);
}
public bool MergeFile(string FileName)
{
bool rslt = false;
string partToken = ".part_";
string baseFileName = FileName.Substring(0, FileName.IndexOf(partToken));
string trailingTokens = FileName.Substring(FileName.IndexOf(partToken) + partToken.Length);
int FileIndex = 0;
int FileCount = 0;
int.TryParse(trailingTokens.Substring(0, trailingTokens.IndexOf(".")), out FileIndex);
int.TryParse(trailingTokens.Substring(trailingTokens.IndexOf(".") + 1), out FileCount);
string Searchpattern = Path.GetFileName(baseFileName) + partToken + "%";
try
{
var CS = System.Configuration.ConfigurationManager.AppSettings["DBConnectionString"];
var FilesList = new List <string>();
using (SqlConnection connection = new SqlConnection())
{
connection.ConnectionString = CS;
connection.Open();
SqlCommand cmd = new SqlCommand();
cmd.Connection = connection;
cmd.CommandTimeout = 0;
string commandText = "select f_name from t_files_temp where f_name like '" + Searchpattern + "'";
cmd.CommandText = commandText;
cmd.CommandType = System.Data.CommandType.Text;
using (var reader = cmd.ExecuteReader())
{
while (reader.Read())
{
FilesList.Add(reader.GetString(0));
}
}
connection.Close();
}
//string[] FilesList = Directory.GetFiles(Path.GetDirectoryName(FileName), Searchpattern);
if (FilesList.Count == FileCount)
{
if (!MergeFileManager.Instance.InUse(baseFileName))
{
MergeFileManager.Instance.AddFile(baseFileName);
List <SortedFile> MergeList = new List <SortedFile>();
foreach (string File in FilesList)
{
SortedFile sFile = new SortedFile();
sFile.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);
sFile.FileOrder = FileIndex;
MergeList.Add(sFile);
}
var MergeOrder = MergeList.OrderBy(s => s.FileOrder).ToList();
using (SqlConnection connection = new SqlConnection())
{
connection.ConnectionString = CS;
connection.Open();
SqlCommand cmd = new SqlCommand();
cmd.Connection = connection;
cmd.CommandTimeout = 0;
string commandText = "INSERT INTO t_files VALUES('" +
baseFileName + "', (SELECT CAST(f_binarystring AS varchar(MAX)) FROM t_files_temp WHERE f_basename = '" +
baseFileName + "' ORDER BY f_id FOR xml PATH('') ) ); ; ";
cmd.CommandText = commandText;
cmd.CommandType = System.Data.CommandType.Text;
using (var reader = cmd.ExecuteReader())
{
while (reader.Read())
{
FilesList.Add(reader.GetString(0));
}
}
connection.Close();
}
rslt = true;
MergeFileManager.Instance.RemoveFile(baseFileName);
WebApplication6.Controllers.HomeController.UploadComplete(baseFileName);
}
}
return(rslt);
}
catch (Exception ex)
{
}
return(rslt);
}
