Question

I have such code so far:

private void button3_Click(object sender, EventArgs e)
{
    label1.Visible = true;
    label2.Visible = true;
    var items = File.ReadAllLines("updated database folder/Resellers_Inventory.txt").
    Skip(1).
    Select(s =>
    {
        var strings = s.Split('|');
        if (strings.Length != 2) throw new FormatException();
        return new { Code = strings[0], Stock = Convert.ToInt32(strings[1]) };
    }).
    ToArray();

    var compareTo = File.ReadAllLines("old database folder/ProductAll.txt").
                Skip(1).
                Select(s =>
                {
                    var strings = s.Split(',');
                    if (strings.Length != 6) throw new FormatException();
                    return new { Path = strings[2].Trim('"'), Id = Convert.ToInt32(strings[3]), Name = strings[4].Trim('"'), Code = strings[5].Trim('"'), Stock = Convert.ToInt32(strings[6]) };
                }).
                ToArray();

    string foldername = DateTime.Now.ToString("yyyy--MM--dd");
    Directory.CreateDirectory("Update file of " + foldername);
    string UpdeitoFailas = @"Update file of " + foldername + "/update.txt";

    foreach (var item in items.Where(i => compareTo.Any(i2 => i.Code == i2.Code)))
    {
        if ((File.Exists(UpdeitoFailas)) && i.Stock != i2.Stock)
        {
            using (StreamWriter sw = new StreamWriter(UpdeitoFailas))
            {
                sw.Write("Product, " + i2.Path + ", " + i2.Id + ", " + i2.Name + ", " + i2.Code + ", " + i.Stock);
             }
         }
     }

The file “Resellers_Inventory.txt” is like this (and consists hundreds of thousands lines):

Order Code|Stock
ACREPAIR|1031
AF813|18
AF823|12
AFCOB11|21
AFCS300|33
AFCS3000|1
AFEM4|5
AFOMNI|17
AFOX2|-3
AFOX3|-3
AFROD|28
AFSENSOR|50
AFUF21|24
AN00001|-1
AN00002|21
AN00003|4
AN00004|4
AN00005|9
...

ProductAll.txt file also consists hundreds of thousands lines which looks like these:

Action,CategoryPath,ID,Name,Code,Stock
"Product","Home > Opto-electronics > LED > Standard LED, Multicolour",2226,"KINGBRIGHT LED, 3MM, HE-RED/GRN L-93WEGW","SC07621",202
"Product","Home > Resistors > Fixed",2228,"VISHAY DRALORIC RESISTOR, 0402, 5%, 10K0 CRCW040210K0JNEAIF","RE06211",0
"Product","Home > Resistors > Fixed",2229,"VISHAY DRALORIC RESISTOR, 0402, 5%, 3R90 CRCW04023R90JNEAIF","RE06212",0
"Product","Home > Resistors > Fixed",2230,"VISHAY DRALORIC RESISTOR, 0402, 5%, 2R70 CRCW04022R70JNEAIF","RE06220",25
"Product","Home > Resistors > Fixed",2231,"VISHAY DRALORIC RESISTOR, 0402, 5%, 33R0 CRCW040233R0JNEAIF","RE06221",0
"Product","Home > Resistors > Fixed",2232,"VISHAY DRALORIC RESISTOR, 0402, 5%, 100R CRCW0402100RJNEAIF","RE06226",0
"Product","Home > IC's > Comparators",2234,"STMICROELECTRONICS IC, COMPARATOR DUAL, DIP8, 393 LM393N","SC10207",57
"Product","Home > IC's > Amplifiers > Operational",2237,"STMICROELECTRONICS OP AMP, QUAD JFET, DIP14 TL084CN","SC07929",82
"Product","Home > IC's > Amplifiers > Audio Power",2239,"NATIONAL SEMICONDUCTOR AMP, AUDIO 0.25W, DIP8, 386 LM386N-1","SC08430",83
"Product","Home > IC's > Microcontrollers",2241,"MICROCHIP 8BIT FLASH MCU, 12F675, DIP8 PIC12F675-I/P","ACREPAIR",16
...

Basically what I want to do is to create third file which would look like ProductAll.txt, but would be different in such way: if in Resellers_Inventory.txt stock is different from ProductAll.txt then we write a line to update.txt which looks same as line in ProductAll.txt but with stock value from Resellers_Inventory.txt. If stock values are same we skip this line and don’t write to our new third file. Matching lines (stocks) is implemented by matching item codes which are same in both files.

At the moment I’m getting such errors:

Error   1   The name 'i' does not exist in the current context  C:\Users\Tutis\Documents\Visual Studio 2008\Projects\WindowsFormsApplication1\WindowsFormsApplication1\Form1.cs 90  53  WindowsFormsApplication1
Error   2   The name 'i2' does not exist in the current context C:\Users\Tutis\Documents\Visual Studio 2008\Projects\WindowsFormsApplication1\WindowsFormsApplication1\Form1.cs 90  64  WindowsFormsApplication1
Error   3   The name 'i2' does not exist in the current context C:\Users\Tutis\Documents\Visual Studio 2008\Projects\WindowsFormsApplication1\WindowsFormsApplication1\Form1.cs 94  48  WindowsFormsApplication1
Error   4   The name 'i2' does not exist in the current context C:\Users\Tutis\Documents\Visual Studio 2008\Projects\WindowsFormsApplication1\WindowsFormsApplication1\Form1.cs 94  65  WindowsFormsApplication1
Error   5   The name 'i2' does not exist in the current context C:\Users\Tutis\Documents\Visual Studio 2008\Projects\WindowsFormsApplication1\WindowsFormsApplication1\Form1.cs 94  80  WindowsFormsApplication1
Error   6   The name 'i2' does not exist in the current context C:\Users\Tutis\Documents\Visual Studio 2008\Projects\WindowsFormsApplication1\WindowsFormsApplication1\Form1.cs 94  97  WindowsFormsApplication1
Error   7   The name 'i' does not exist in the current context  C:\Users\Tutis\Documents\Visual Studio 2008\Projects\WindowsFormsApplication1\WindowsFormsApplication1\Form1.cs 94  114 WindowsFormsApplication1

But even without this I don’t know how to write to new update.txt file symbols “ that lines would look same as in ProductAll.txt just with other stock value.

Answer 1

Its a bit hard to see whats going on in the code, but you can use File.WriteAllLines to create your results file.

I’m using my answer from your question yesterday to show it working as i can’t get the example you posted working.

    private void UpdateProducts()
    {
        ThreadPool.QueueUserWorkItem((o) =>
        {
            DateTime start = DateTime.Now;
            List<string> updatedProducts = new List<string>();
            List<string[]> stock = new List<string[]>(File.ReadAllLines("G:\\Stock.txt").Select(line => line.Split('|')));
            List<string> products = new List<string>(File.ReadAllLines("G:\\Products.txt"));
            updatedProducts.Add(products[0]);
            SetProgress(products.Count);
            foreach (var item in products)
            {
                if (stock.Any(s => item.Contains(s[0]) && !item.EndsWith(s[1])))
                {
                    string[] p = item.Split(',');
                    int productStockIndex = Array.IndexOf(p, p.Last());
                    int productNameIndex = productStockIndex - 1;
                    string productName = p[productNameIndex].Replace("\"", "");
                    p[productStockIndex] = stock.First(stk => stk[0] == productName)[1];
                    updatedProducts.Add(string.Join(",", p));
                }
                UpdateProgress(updatedProducts.Count);
            }
            File.WriteAllLines(@"G:\Results.txt", updatedProducts.ToArray());
        });
    }

    private void SetProgress(int maxValue)
    {
        base.Invoke((Action)delegate 
        {
            progressBar1.Maximum = maxValue;
        });
    }

    private void UpdateProgress(int value)
    {
        base.Invoke((Action)delegate
        {
            progressBar1.Value = value;
        });
    }

    private void button1_Click(object sender, EventArgs e)
    {
        UpdateProducts();
    }

good luck 🙂