asked on

Traversing GridView

Hi,

I have a bit of a unusual requirement. I have gridview which when populated looks like this:

I need to produce some code that will look at each row.
It’ll start with 2377, it then need to work out that col 2 is blank so insert a value (which will be derived from 2377) then move on to col 3, blank so insert the same value again, same for col 4, insert value. Col 5 has a value, so do nothing, col 6 is blank so insert value (derived from col 5), col 7 is blank so insert value.
This logic needs to repeat for each row.

Can’t seem to work out how to do this so would be grateful for any suggestions?

it_saige

Would each current columns value be derived from the previous columns value (it looks like that is what you are saying but just double checking), if so, something like:

			int currentCellValue = -1;
			int previousCellValue = -1;
			for (int i = 0; i < grid.Rows.Count; i++)
			{
				for (int j = 0; j < grid.Rows[i].Cells.Count; j++)
				{
					if (int.TryParse(grid.Rows[i].Cells[j].Value.ToString(), out currentCellValue))
						continue;
					else
					{
						if (j == 0)
							MessageBox.Show(string.Format("Column {0}, does not contain a valid value.", j));
						else 
						{
							if (int.TryParse(grid.Rows[i].Cells[j - 1].Value.ToString(), out previousCellValue))
								grid.Rows[i].Cells[j].Value = GetDerivedValue(previousCellValue);
						}
					}
				}
			}

Open in new window

Should suffice.

-saige-

andyw27

ASKER

Thanks for the idea, I'll give it a go.

Yep, to populate row 1, col 2 I'll need to take 2377, do something which will then return a value. this returned value will go into col2, col3 and col4

it_saige

Ok I think I better understand your situation (had to reread your original question and your subsequent response). With that in mind, this:

			int currentCellValue = -1;
			int previousCellValue = -1;
			int derivedValue = -1;
			for (int i = 0; i < grid.Rows.Count; i++)
			{
				for (int j = 0; j < grid.Rows[i].Cells.Count; j++)
				{
					if (int.TryParse(grid.Rows[i].Cells[j].Value.ToString(), out currentCellValue))
					{
						derivedValue = -1;
						continue;
					}
					else
					{
						if (j == 0)
							MessageBox.Show(string.Format("Row {0} - Column {1}, does not contain a valid value.", i, j));
						else 
						{
							if (int.TryParse(grid.Rows[i].Cells[j - 1].Value.ToString(), out previousCellValue))
							{
								if (derivedValue == -1)
									derivedValue = GetDerivedValue(previousCellValue);
								grid.Rows[i].Cells[j].Value = derivedValue;
							}
							else
								MessageBox.Show(string.Format("Row {0} - Column {1}, does not contain a valid value.", i, j));
						}
					}
				}
				currentCellValue = -1;
			}

Open in new window

Should satisfy your requirements.

-saige-

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it_saige

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andyw27

ASKER

Thanks for taking the time to produce the example. Works well.

it_saige

Not a problem.

-saige-