We Keep Coding

Linking the Cells of a spreadsheet like excel to be able to perform formulas c#. Eg: A1 +C8

In Our assignment we were given a task to create a new spreadsheet program with a 26 x 26 grid of textboxes without importing anything and make use of array (in my case I Used array of objects).
I created a 2 d array of objects containing size of grid (27x27). the reason of it being 27 instead of 26 is because the first row and column is to show the ABCDE etc and 12345 etc of the rows and columns.
now the rows indexation I had no problem because it is numeric. however, the letters I solved by creating a string array with alphabet from a to z and entering them through a for loop and it worked.
Now the next step is to be able to link the cells, however, I am a bit stumped, because people told me I have to use Ascii or smthin.
Can anyone help me plz on how to achieve the cell links?
I have been able to past the name of each cell using this code but I fear I just filled the .Text of the cells not the cells name per se:
for (int x = 1; x < TwoDArrayCells.GetLength(0); x++) //nested loop to create the grid of textboxes.
{
for (int y = 1; y < TwoDArrayCells.GetLength(1); y++)
{
Cells CellFields = new Cells(Name = $"{AlphabetRow[x]}{y}", x, y + 3); // called a new cell named CellFields.
CellFields.Text = Name;//Change to location if you wise to take
this.Controls.Add(CellFields);
}
}
The result I would like is to be able to after this be able to link cells. meaning if I insert in a text box A1 + A2 it knows that a1 is the first box in the first row of first column and the a2 is the box in the second row of the first column.

Assuming that Columns can be A-Z only (Capitals), You can extract the column index and row index as follows:
Given a cell, string cell = "A2";
- the column index: int column = cell[0] - 'A' + 1;
- the row index: int row = Convert.ToInt32(cell.Substring(1));
Explanation: for the column, take the first letter, subtract it from 'A' (the subtraction will be performed on the assci codes of the characters) and add 1 since your actual cells are stored starting from index 1. for the row, just parse the rest of the string to int.

Counting rows of filtered excel Range in C#

I've been working in a c# project and what I'm trying to accomplish is counting the visible rows of a filtered range in C#.
First, I create a range that I'm going to filter.
Range usedRange = sheet.Range[sheet.Cells[7, 1], sheet.UsedRange.SpecialCells(XlCellType.xlCellTypeLastCell)];
Then, I apply 2 filters:
usedRange.AutoFilter(20, "<>RAW", XlAutoFilterOperator.xlFilterValues, "<>AV", true);
usedRange.AutoFilter(2, "ARG", XlAutoFilterOperator.xlFilterValues, Type.Missing, true);
And last, I create another range, using the "XlCellType.xlCellTypeVisible" and try to count the rows, but the count returns 1
argFiltered = usedRange.SpecialCells(XlCellType.xlCellTypeVisible);
Console.WriteLine("Number of rows: "+ argFiltered.Rows.Count) // the count returns 1.
If I loop through the Range I Can get the count. But with a big amount of data this can slow the process a lot:
//this is not effective
foreach (Range area in argFiltered.Areas) {
foreach (Range areaRow in area) {
count++;
}
}
My question is: is there any way to get the number of the visible filtered rows "directly"?
Thank you all!
Note:
If I select the range, it selects the exact number of rows that should be displayed in the count!.
argFiltered.Select();

Not ideal but this will be somewhat better:
foreach (Range area in argFiltered.Areas) {
count += area.Rows.Count;
}

Can you afford to put a formula in some unused cell that counts the rows? If you use the Subtotal function with code 3 it won't count the rows hidden by a filter. Put a formula in a cell and read its value, e.g.
sheet.Cells[1, 255].Formula = "=subtotal(3, A1:A16383)"; //Count all rows that have a non-blank column A and aren't hidden
var count = sheet.Cells[1, 255].Value;
sheet.Cells[1, 255].ClearContents();

How to read a column cell in Listview

I try to read whole rows of a given column in listview
As I'm new in C# and use of listview I saw it does not work as List
Below is the code that I use (What I found as solution in some sites)
for (int i = 0; i < rapview.Items.Count; ++i)
{
int idx = 0;
foreach (ColumnHeader header in rapview.Columns)
{
if (header.Text == "Bak. €")
{
MyArray[0] = GeneralMethod.GetClientName(conn, rapview.Items[1].Text);
di = new ListViewItem(MyArray);
tmpView.Items.Add(di);
}
++idx;
}
}
I want to retrieve 1st column 7th column cells, but I see that rapview.Items[1].Text is empty and similar for 7th cell.
Either I miss something or given solution is not correct.
How to read the value of those cells. If possible with column number by bypassing the foreach loop?

This is a loop that copies every value in the 7th column to a list of strings.
If there is no 7th column in the row it adds an empty string.
int column = 6;
List<string> values = new List<string>();
foreach (ListViewItem lvi in rapview.Items)
if (lvi.SubItems.Count - 1 < column) values.Add("");
else values.Add(lvi.SubItems[column].Text);
Note that C# counts zero-based, so the 7th column is indexed as 6.
You could test the value in row 1 column 7 as:
Console.WriteLine("Cell 7 in row 1 contains:" + values[0]);
Note that every Item in a ListView can have its own number of SubItems. Therefore we must test it before we access it!
Also note that SubItem[0] has the same value/text as the Item!

How to store the last few numbers as a variable in a table row

If I have a table , with row with numbers like 70-0002098, lets just call the row, ID
I need the last 4 numbers for all the table rows,
So what I need is something like
foreach(var row in table)
{
var Id = row.ID(but just the last 4 digits)
}

Not sure what format you want to store it as, or what you want to do with it after, but...
Edit: Added an if check for length to avoid index out of bounds condition. Also corrected syntax- SubString() => Substring()
int count = 0;
foreach(var row in table){
string temp = row.ID.ToString();
count += (temp.Length > 5)? Convert.ToInt32(temp.Substring(temp.Length-5, 4)) : Convert.ToInt32(temp);
}
// But I have no idea what datatype you have for that or what
// you want to do (count up the integer values or store in an array or something.
// From here you can do whatever you want.

Your illustration suggests that the RowID is not currently a number (its got a hyphen in it) so I assume its a string
id.Right(4);
will return the right four characters. It doesn't guarantee they are numbers though. Right is an extension method of string which can be easily written, or copied from this thread Right Function in C#?

Comparing two datagridviews

I have two datagridviews in one form. The first, datagridview1 has columns and data:
name IC EMAIL TELEPHONE
------------------------------------------------------
rOO 898989096677 AB#YAHOO.COM 018-9097878
datagridview2 has
name IC EMAIL TELEPHONE ID
-----------------------------------------------------------
rOO 898989096677 AB#YAHOO.COM 018-9097878 8787
I would like to ask help on how to compare two datagridviews, as you can see in the figure I would like to compare the four columns from one datagridview to another datagridview and see if any results match. For example, does the roo name match with the another datagridview, I want the value in the id (8787) to be sent to another datagridview.

there is a very simple solution to compare twoo datagridview and show their result in 3rd one.
for (int i = 0; i < dtView1.Rows.Count; i++)
{
for (int j = 1; j < dtView1.Columns.Count; j++)
{
if ((dtView1.Rows[i][j]) == (dtView2.Rows[i][j]))
{
// here you can add your own logic
}
else
{
// here you can add your own logic
}
}
|

Let's assume that you populate both datagrids with the same objects that contain these 4 properties from your example. You must check for the selected row from the first datagrid if in the second datagrid there is an matching object, based on your filters. Use Linq. If so, then copy the data from the selected item from the first datagrid into the matching element from the seconds. I am affraid that you will need to do all these steps manually, because there is no method that can compare two data grids and you just set some filters and the job is done. You will have some work to do, but it is not hard. Good luck.

Steve's answer does not work correctly and will not compile.
Here is my solution:
int x = 0;
int y = 0;
int i = -1;
int z = 0;
foreach (DataGridViewRow row in dataGridView1.Rows)
{
i++;
if ((dataGridView1.Rows[i].Cells[i].Value) == (dataGridView2.Rows[z].Cells[i].Value))
{
x++;
}
else
{
y++;
}
if (z < dataGridView2.Rows.Count)
{
z++;
}
if(z == dataGridView2.Rows.Count)
{
z--; //subtract 1 from the total count because the datagrid is 0 index based.
}
MessageBox.Show("Matched: " + x.ToString() + "\r\n" + "Not Matched: " + y.ToString());
A foreach loop on the datagrid will cycle through each row, you can then select a cell or even cells to compare. This code is a bit lengthy and I'm sure it can be simplified, however it does the job.
Currently this will check every row from datagrid 2 for a match in datagrid 2, only on a single column.
Its import to remember the datagrid is 0 index based. The Count property of the datagrid gives a [1]index based count, so we need to subtract the last iteration on datagrid 2.