Convert LINQ C# to normal C# code

R Ravula

13y8.6kLINQ

Hi,

Can you please help me converting below two LINQ queries (Inside foreach loops) to normal/regular C# code:

DirectoryInfo di = new DirectoryInfo(path);

try

{

DirectoryInfo[] subdirs = di.GetDirectories();

foreach (DirectoryInfo dinfo in subdirs)

{

var files = dinfo.GetFiles("*").Where(w=>(w.LastWriteTime<=DateTime.Now.AddMonths(-6))).OrderByDescending(s => s.LastWriteTime).GroupBy(e => e.LastWriteTime.Month).ToList();

foreach (var item in files)

{

SaveZip(item.Select(s=>s).ToList());

}

Thanks,

6 Replies

Know the answer? Post it — somebody with the same question will find it here.

Vulpes13y ago
It's about 8 years now since I last used VS 2003 (.NET 1.1) and I can't remember now what was the recommended library for zipping and unzipping files at that time.

However, I do remember that the runtime library of the now defunct .NET language J# (Java compatible) contained lots of stuff that the .NET framework 1.1 lacked including zip/unzip support.

I've dug out a couple of old articles which show how to use this from C# and I'd check them out to see whether you can use it instead of Ionic.Zip:

http://www.codeproject.com/Articles/6850/Zip-and-Unzip-from-a-C-program-using-J-runtime

http://msdn.microsoft.com/en-us/magazine/cc164129.aspx

0
R Ravula13y ago
Hi,

Ionic.Zip dll is not working with .NET 1.1. Please advise!

Thanks,
R
0
Vulpes13y ago
If you're using VS 2003 (.NET 1.1), then you won't be able to use either LINQ or generics.

You'll therefore need to use the ArrayList and Hashtable classes rather than their generic equivalents.

Although it's difficult to be sure as I no longer have VS 2003, the following should work but won't necessarily return the groups of files (by month) in the same order as the LINQ code did:

using System;
using System.Collections;
using System.Text;
using System.IO;
using Ionic.Zip;

namespace ZipTool
{
// compares by LastWriteTime in reverse
public class FileInfoComparer : IComparer
{

int IComparer.Compare(object x, object y)
{
FileInfo fix = (FileInfo)x;
FileInfo fiy = (FileInfo)y;
if(fix.LastWriteTime < fiy.LastWriteTime)
{
return 1;
}
else if(fix.LastWriteTime > fiy.LastWriteTime)
{
return -1;
}
else
{
return 0;
}
}
}

public class TotalZIP
{
public void CreateZip(string path)
{
DirectoryInfo di = new DirectoryInfo(path);
try
{
DirectoryInfo[] subdirs = di.GetDirectories();

foreach (DirectoryInfo dinfo in subdirs)
{
FileInfo[] fia = dinfo.GetFiles("*");
ArrayList fil = new ArrayList();
foreach(FileInfo fi in fia)
{
if(fi.LastWriteTime <= DateTime.Now.AddMonths(-6)) fil.Add(fi);
}
fil.Sort(new FileInfoComparer());
Hashtable fih = new Hashtable();

foreach(FileInfo fi in fil)
{
if (fih.ContainsKey(fi.LastWriteTime.Month))
{
((ArrayList)fih[fi.LastWriteTime.Month]).Add(fi);
}
else
{
fih.Add(fi.LastWriteTime.Month, new ArrayList(){fi});
}
}

ArrayList files = new ArrayList();

foreach(DictionaryEntry de in fih)
{
files.Add(de.Value);
}

foreach(ArrayList lfi in files)
{
SaveZip(lfi);
}
}
}
catch
{
Console.WriteLine("Couldnt find the path");
return;
}

}

public void SaveZip(ArrayList files)
{
string path = @"c:\";
using (ZipFile zip = new ZipFile())
{
zip.Name = "Archive";
foreach (FileInfo item in files)
{
path = item.DirectoryName;
zip.AddFile(item.FullName);
}
zip.Save(path + DateTime.Now.ToLongDateString()+ " " + DateTime.Now.Hour.ToString() + " " + DateTime.Now.Minute.ToString() + " " + DateTime.Now.Second.ToString() + " " + DateTime.Now.Millisecond.ToString() + ".zip");
}

}
}
}

However, I'm assuming that Ionic.Zip will work with .NET 1.1 - it may not do.
0
Iftikar Hussain13y ago
try like this

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
using Ionic.Zip;
namespace ZipTool
{
public class TotalZIP
{
public void CreateZip(string path)
{
DirectoryInfo di = new DirectoryInfo(path);
try
{
List files = new List();
DirectoryInfo[] subdirs = di.GetDirectories();
foreach (DirectoryInfo dinfo in subdirs)
{

foreach (FileInfo w in dinfo.GetFiles("*"))
{
if ((w.LastWriteTime <= DateTime.Now.AddMonths(-6)))
{
files.Add(w);
}
}
}
SaveZip(files);
}
catch (Exception ex)
{
Console.WriteLine("Couldnt find the path");
return;
}
}

public void SaveZip(List files)
{
string path = @"c:\";
using (ZipFile zip = new ZipFile())
{
zip.Name = "Archive";
foreach (var item in files)
{
path = item.DirectoryName;
zip.AddFile(item.FullName);
}
zip.Save(path + DateTime.Now.ToLongDateString()+ " " + DateTime.Now.Hour.ToString() + " " + DateTime.Now.Minute.ToString() + " " + DateTime.Now.Second.ToString() + " " + DateTime.Now.Millisecond.ToString() + ".zip");
}

}
}
}

Regards,
Iftikar
0
R Ravula13y ago
Hi Iftikar,

I am trying to zip files in C# for last 6 months and here is the code, but I don't want to use LINQ because I have to run it in Visual Studio 2003 which does not support LINQ.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
using Ionic.Zip;
namespace ZipTool
{
public class TotalZIP
{
public void CreateZip(string path)
{
DirectoryInfo di = new DirectoryInfo(path);
try
{

DirectoryInfo[] subdirs = di.GetDirectories();
foreach (DirectoryInfo dinfo in subdirs)
{
var files = dinfo.GetFiles("*").Where(w=>(w.LastWriteTime<=DateTime.Now.AddMonths(-6))).OrderByDescending(s => s.LastWriteTime).GroupBy(e => e.LastWriteTime.Month).ToList();

foreach (var item in files)
{
SaveZip(item.Select(s=>s).ToList());
}
}
}
catch (Exception ex)
{

Console.WriteLine("Couldnt find the path");
return;
}
}

public void SaveZip(List files)
{
string path = @"c:\";
using (ZipFile zip = new ZipFile())
{
zip.Name = "Archive";
foreach (var item in files)
{
path = item.DirectoryName;
zip.AddFile(item.FullName);
}
zip.Save(path + DateTime.Now.ToLongDateString()+ " " + DateTime.Now.Hour.ToString() + " " + DateTime.Now.Minute.ToString() + " " + DateTime.Now.Second.ToString() + " " + DateTime.Now.Millisecond.ToString() + ".zip");
}

}
}
}

Regards,
R
0
Iftikar Hussain13y ago
Hi,
In normal code you can't use order by and group by option. It will be better if you can explain what exactly you need inside the for loop

Regards,
Iftikar
0