How to Read&Write file for sort the string names in file

Vijay

How to read and write the file for sorting the string names in source file and want to write it on target file in C# using Windows Form Application ?

* The Source file(*.txt) was already created and it contains

Hockey

BAsketball

Football

Tennis

Cricket

* I want to read a source file using streamwriter and also sort the strings in alphabetically

* That sorted string values write on the another target file(*.txt) using streamwriter

plz help this.....

Thanks !!

9 Replies

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Iftikar Hussain13y ago
You can use String.Compare.

The role of IComparable is to provide a method of comparing two objects of a particular type. This is necessary if you want to provide any ordering capability for your object.

Regards,
Iftikar
0
Vijay13y ago
Dear Iftikar,

Plz let me know one thing....

Instead of using

  if (String.Compare(data[j- 1], data[j]) > 0)
string temp = data[i - 1];

You used....
if (((IComparable)data[j - 1]).CompareTo(data[j]) > 0)
                object temp = data[j - 1];

what is use of IComparable and why you used object for temp var ?

difference between IComparable and String.Compare ?

0
Iftikar Hussain13y ago
try like this

private void button1_Click(object sender, EventArgs e)
{
OpenFileDialog openFileDialog1 = new OpenFileDialog();

openFileDialog1.InitialDirectory = "c:\\";
openFileDialog1.Filter = "txt files (*.txt)|*.txt|All files (*.*)|*.*";
openFileDialog1.FilterIndex = 2;
openFileDialog1.RestoreDirectory = true;

if (openFileDialog1.ShowDialog() == DialogResult.OK)
{
ArrayList data = new ArrayList();
string line;
string filename = openFileDialog1.FileName;
using (StreamReader file = new StreamReader(filename))
{
while ((line = file.ReadLine()) != null)
{
data.Add(line);
}
}

int n = data.Count - 1;
for (int i = 0; i < n; i++)
{

for (int j = n; j > i; j--)
{
if (((IComparable)data[j - 1]).CompareTo(data[j]) > 0)
{
object temp = data[j - 1];
data[j - 1] = data[j];
data[j] = temp;
}
}
}

string tarPath = @"d:\After Sorted.txt";
using (StreamWriter stwr = new StreamWriter(tarPath))
{
foreach (var text in data)
{
stwr.WriteLine(text);
}
}
MessageBox.Show("Completed sorting !!");
}
}

Regards,
Iftikar
0
Vijay13y ago
Dear lftikar,

I tried that code like....

When i browse and select that source file , the file was selected. After that i want to sort which was i selected file. After that i want write on another file which was sorted strings.

private void button1_Click(object sender, EventArgs e)
{
Stream myStream = null;
OpenFileDialog openFileDialog1 = new OpenFileDialog();

openFileDialog1.InitialDirectory = "c:\\";
openFileDialog1.Filter = "txt files (*.txt)|*.txt|All files (*.*)|*.*";
openFileDialog1.FilterIndex = 2;
openFileDialog1.RestoreDirectory = true;

if (openFileDialog1.ShowDialog() == DialogResult.OK)
{
try
{
//ArrayList data = new ArrayList();
string[] data=new string[]{};
string line = "";
string filename = openFileDialog1.FileName;

if ((myStream = openFileDialog1.OpenFile()) != null)
{
//using (myStream)
//{
// // Insert code to read the stream here.
//}
using (StreamReader file = new StreamReader(filename))
{
while ((line = file.ReadLine()) != null)
{
//data.Add(line);
file.ReadLine();
}
}

for (int i = 0; i < data.Length; i++)
{
if (String.Compare(data[i - 1], data[i]) > 0)
{
string temp = data[i - 1];
data[i - 1] = data[i];
data[i] = temp;
}
}

string tarPath = @"d:\After Sorted.txt";
using (StreamWriter stwr = new StreamWriter(tarPath))
{
foreach (var text in data)
{
stwr.WriteLine(text);
}
}
MessageBox.Show("Completed sorting !!");

}
}

catch (Exception ex)
{
MessageBox.Show("Error: Could not read file from disk. Original error: " + ex.Message);
}

}

}
0
Iftikar Hussain13y ago
Try like this

private void button1_Click(object sender, EventArgs e)
{
ArrayList data=new ArrayList();
string line;
string sourcePath = @"C:\test.txt";
using (StreamReader file =new StreamReader(sourcePath))
{
while ((line = file.ReadLine()) != null)
{
data.Add(line);
}
}

var query = from p in data.Cast()
let item = p
orderby item ascending
select new
{
Item = item
};

//data.Sort();
string destPath = @"C:\test_new.txt";
using (StreamWriter file = new StreamWriter(destPath))
{
foreach (var text in query)
{
file.WriteLine(text.Item);
}
}
MessageBox.Show("Complete");
}

Regards,
Iftikar
0
Vijay13y ago
Dear lftikar, Am asking how to use sorting the string names without using that sorting methods like Sort(),Array.Sort().... i want use some logics for sorting
0
Iftikar Hussain13y ago
yes, using linq or any sorting algorithm.

Regards,
Iftikar
0
Vijay13y ago

thank u very much Iftikar...

Is this possible to sort without using any sorting methods.....
0
Iftikar Hussain13y ago
Hi,
Try like this

private void button1_Click(object sender, EventArgs e)
{
ArrayList data=new ArrayList();
string line;
string sourcePath = @"C:\test.txt";
using (StreamReader file =new StreamReader(sourcePath))
{
while ((line = file.ReadLine()) != null)
{
data.Add(line);
}
}

data.Sort();
string destPath = @"C:\test_new.txt";
using (StreamWriter file = new StreamWriter(destPath))
{
foreach (string text in data)
{
file.WriteLine(text);
}
}
MessageBox.Show("Complete");
}

Regards,
Iftikar
0