private void MergePlain(List <string> filelist, string outputfilename, bool unswap)
{
int buffersize = 50000;
StreamWriter writer = new StreamWriter(File.Open(outputfilename, FileMode.Create));
StreamReader[] srarr = new StreamReader[filelist.Count];
Queue <string>[] q = new Queue <string> [filelist.Count];
for (int i = 0; i < filelist.Count; i++)
{
q[i] = new Queue <string>();
}
for (int i = 0; i < filelist.Count; i++)
{
srarr[i] = new StreamReader(filelist[i]);
}
for (int i = 0; i < filelist.Count; i++)
{
int qlength = 0;
while (!srarr[i].EndOfStream && qlength < buffersize)
{
string line = srarr[i].ReadLine();
q[i].Enqueue(line);
qlength++;
}
}
var sd = new SortedDictionary <string, int>();
for (int i = 0; i < q.Length; i++)
{
if (q[i].Count > 0)
{
sd.AddAnyway(q[i].Dequeue(), i);
}
}
if (sd.Any())
{
while (true)
{
if (!sd.Any())
{
for (int i = 0; i < filelist.Count; i++)
{
int qlength = 0;
if (!q[i].Any())
{
while (!srarr[i].EndOfStream && qlength < buffersize)
{
string line = srarr[i].ReadLine();
q[i].Enqueue(line);
qlength++;
}
}
}
for (int i = 0; i < q.Length; i++)
{
if (q[i].Count > 0)
{
sd.AddAnyway(q[i].Dequeue(), i);
}
}
}
if (!sd.Any())
{
break;
}
int filenum = sd.First().Value;
string row = sd.First().Key.TrimEnd('\t');
writer.WriteLine(unswap ? UnSwap(row) : row);
sd.Remove(sd.First().Key);
if (!q[filenum].Any())
{
int qlength = 0;
while (!srarr[filenum].EndOfStream && qlength < buffersize)
{
string line = srarr[filenum].ReadLine();
q[filenum].Enqueue(line);
qlength++;
}
}
if (q[filenum].Any())
{
string key = q[filenum].Dequeue();
sd.AddAnyway(key, filenum);
}
}
}
for (int i = 0; i < filelist.Count; i++)
{
srarr[i].Dispose();
}
foreach (string filename in filelist)
{
if (File.Exists(filename))
{
File.Delete(filename);
}
}
writer.Dispose();
}