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C# DataGridView export to a text file

Posted on 2008-10-23
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Last Modified: 2010-10-05
Hi im just brand new here and already im highly impressed with the site.

Just a simple question (hopefully), i am trying to do something exactly the same as shown here http://www.experts-exchange.com/Programming/Languages/C_Sharp/Q_23263374.html?sfQueryTermInfo=1+c+datagridview+export

But my DataGridView is made up of all text. So how would i modify this function to work accordingly?

And then how would i call it?   ExportGridData(List<string>);     ???


I have included the code snipits used to populate the datagridview if that heklps explain what i am trying to do.

Basically i want to export the data once modified to comma separated file.
private void ImportCSV()
{
    List<string[]> testParse =
          parseCSV(txtInputPath.Text);
    
    DataTable newTable = new DataTable();
            foreach (string column in testParse[0])
            {
                newTable.Columns.Add();
            }
  
    foreach (string[] row in testParse)
    {
        newTable.Rows.Add(row);
    }
        DataGrid.DataSource = newTable;
}
 
public List<string[]> parseCSV(string path)
        {
            List<string[]> parsedData = new List<string[]>();
            using (StreamReader readFile = new StreamReader(path))
            {
                string line;
                string[] row;
 
                while ((line = readFile.ReadLine()) != null)
                {
                    row = line.Split(',');
                    parsedData.Add(row);
                }
            }
 
            return parsedData;
 
        }

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Question by:A_Kardas
1 Comment
 
LVL 18

Accepted Solution

by:
Priest04 earned 200 total points
ID: 22798816
The code should work fine with your datagridview. What confuses you is the parameter List<int>. As I understood at a quick view at code, its an array of RowIndeces that you want to avoid exporting to txt file. for example, if your datagridview contains 10 rows, and you want to avoid exporting rows with index 2, 4 and 7, then you would do this

List<int> list = new List<int>();
list.Add(2);
list.Add(4);
list.Add(7);

// and then call the function
ExportGridData(list);

What I dont like about this function is that it is hardcoded to a particular datagridview name. DataGRidView should be passed as a parameter to this function, so I would rewrite it in the bellow way

to call the function
ExportGridData(MyDataGridView, null, @"C:\test.txt");
private void ExportGridData(DataGridView dgv, List<int> omitIndices, string filePath)
{
    StreamWriter writer = new StreamWriter(filePath);
 
    if (dgv.Rows.Count > 0)
    {
        foreach (DataGridViewColumn col in dgv.Columns)
        {
            if (col.Index == dgv.Columns.Count - 1)
            {
                writer.WriteLine(col.HeaderText);
            }
            else
            {
                writer.Write(string.Concat(col.HeaderText, ","));
            }
        }
 
        foreach (DataGridViewRow row in dgv.Rows)
        {
            if (omitIndices == null || !omitIndices.Contains(row.Index))
            {
                foreach (DataGridViewCell cell in row.Cells)
                {
                    if (cell.OwningColumn.Index == dgv.Columns.Count - 1)
                    {
                        if (cell.Value != null)
                            writer.WriteLine(cell.Value.ToString());
                        else
                            writer.WriteLine("");
                    }
                    else
                    {
                        if (cell.Value != null)
                            writer.Write(string.Concat(cell.Value.ToString(), ","));
                        else
                            writer.Write(string.Concat("", ","));
                    }
                }
            }
        }
    }
 
    writer.Close();
}

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