Oleh: ekoyw | Maret 22, 2010

Convert DataGridView to Excel in C#.NET

Actually, I don’t make the main source code of the following code. I copied and paste this code to my project. You can find this from original site http://www.codeguru.com/forum/showthread.php?t=421702.

I’ve try to implement it but found some errors. These errors occur when it reads the rows and columns of the DataGridView which will be converted. So, I made a little modification and finally it works!!!

So, here’s  my modification :

#region Export to Excel
/// <summary>
/// Exports a passed datagridview to an Excel worksheet.
/// If captions is true, grid headers will appear in row 1.
/// Data will start in row 2.
/// </summary>
/// <param name=”datagridview”></param>
/// <param name=”captions”></param>
public void Export2Excel(DataGridView datagridview, bool captions)
{
object objApp_Late;
object objBook_Late;
object objBooks_Late;
object objSheets_Late;
object objSheet_Late;
object objRange_Late;
object[] Parameters;
string[] headers = new string[datagridview.ColumnCount];
string[] columns = new string[datagridview.ColumnCount];

int i = 0;
int c = 0;
for (c = 0; c <= datagridview.ColumnCount – 1; c++)
{
headers[c] = datagridview.Rows[0].Cells[c].OwningColumn.Name.ToString();
i = c + 65;
columns[c] = Convert.ToString((char)i);
}

try
{
// Get the class type and instantiate Excel.
Type objClassType;
objClassType = Type.GetTypeFromProgID(“Excel.Application”);
objApp_Late = Activator.CreateInstance(objClassType);
//Get the workbooks collection.
objBooks_Late = objApp_Late.GetType().InvokeMember(“Workbooks”,
BindingFlags.GetProperty, null, objApp_Late, null);
//Add a new workbook.
objBook_Late = objBooks_Late.GetType().InvokeMember(“Add”,
BindingFlags.InvokeMethod, null, objBooks_Late, null);
//Get the worksheets collection.
objSheets_Late = objBook_Late.GetType().InvokeMember(“Worksheets”,
BindingFlags.GetProperty, null, objBook_Late, null);
//Get the first worksheet.
Parameters = new Object[1];
Parameters[0] = 1;
objSheet_Late = objSheets_Late.GetType().InvokeMember(“Item”,
BindingFlags.GetProperty, null, objSheets_Late, Parameters);

if (captions)
{
// Create the headers in the first row of the sheet
for (c = 0; c <= datagridview.ColumnCount – 1; c++)
{
//Get a range object that contains cell.
Parameters = new Object[2];
Parameters[0] = columns[c] + “1”;
Parameters[1] = Missing.Value;
objRange_Late = objSheet_Late.GetType().InvokeMember(“Range”,
BindingFlags.GetProperty, null, objSheet_Late, Parameters);
//Write Headers in cell.
Parameters = new Object[1];
Parameters[0] = headers[c];
objRange_Late.GetType().InvokeMember(“Value”, BindingFlags.SetProperty,
null, objRange_Late, Parameters);
}
}

// Now add the data from the grid to the sheet starting in row 2
for (i = 0; i < datagridview.RowCount – 1; i++)
{
for (c = 0; c <= datagridview.ColumnCount – 1; c++)
{
//Get a range object that contains cell.
Parameters = new Object[2];
Parameters[0] = columns[c] + Convert.ToString(i + 2);
Parameters[1] = Missing.Value;
objRange_Late = objSheet_Late.GetType().InvokeMember(“Range”,
BindingFlags.GetProperty, null, objSheet_Late, Parameters);
//Write Headers in cell.
Parameters = new Object[1];
Parameters[0] = datagridview.Rows[i].Cells[headers[c]].Value.ToString();
objRange_Late.GetType().InvokeMember(“Value”, BindingFlags.SetProperty,
null, objRange_Late, Parameters);
}
}

//Return control of Excel to the user.
Parameters = new Object[1];
Parameters[0] = true;
objApp_Late.GetType().InvokeMember(“Visible”, BindingFlags.SetProperty,
null, objApp_Late, Parameters);
objApp_Late.GetType().InvokeMember(“UserControl”, BindingFlags.SetProperty,
null, objApp_Late, Parameters);
}
catch (Exception theException)
{
String errorMessage;
errorMessage = “Error: “;
errorMessage = String.Concat(errorMessage, theException.Message);
errorMessage = String.Concat(errorMessage, ” Line: “);
errorMessage = String.Concat(errorMessage, theException.Source);

MessageBox.Show(errorMessage, “Error”);
}
}
#endregion


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