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Calculation in the DataGridView column

I have a DataGridView in which I want to sum the values ​​from two different columns to a third column.

Example DataGridView:

A   B   Total
1   2    3
25  35   60
5   -5   0

I want to add (A + B) everything, right after entering the values ​​in A & B columnor leave the current line. And also want to set Total Column as ReadOnly.

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4 answers

You can do this on CellValidatedEvent, and you can apply the same method to RowValidated:

 private void dataGridView_CellValidated(object sender, DataGridViewCellEventArgs e) {
                if (e.RowIndex > -1) {
                    DataGridViewRow row = dataGridView.Rows[e.RowIndex];
                    string valueA = row.Cells[columnA.Index].Value.ToString();
                    string valueB = row.Cells[columnB.Index].Value.ToString();
                    int result;
                    if (Int32.TryParse(valueA, out result)
                        && Int32.TryParse(valueB, out result)) {
                        row.Cells[columnTotal.Index].Value = valueA + valueB;
                    }
                }
            }

You can set the column to ReadOnly in the constructor, or like this:

dataGridView.Columns["Total"].ReadOnly = true
+7
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This is a working example:

public partial class Form1 : Form
{
    DataGridView _calcDataGridView;

    public Form1()
    {
        InitializeComponent();

        _calcDataGridView = new DataGridView();
        this.Controls.Add(_calcDataGridView);
        _calcDataGridView.Dock = DockStyle.Fill;

        _calcDataGridView.Name = "CalcDataGridView";
        _calcDataGridView.CellEndEdit += Calculate;

        var aColumn = new DataGridViewTextBoxColumn();
        aColumn.Name = "AColumn";
        aColumn.HeaderText = "A";
        _calcDataGridView.Columns.Add(aColumn);

        var bColumn = new DataGridViewTextBoxColumn();
        bColumn.Name = "BColumn";
        bColumn.HeaderText = "B";
        _calcDataGridView.Columns.Add(bColumn);

        var totalColumn = new DataGridViewTextBoxColumn();
        totalColumn.Name = "TotalColumn";
        totalColumn.HeaderText = "Total";
        totalColumn.ReadOnly = true;
        _calcDataGridView.Columns.Add(totalColumn);
    }

    private void Calculate(object sender, DataGridViewCellEventArgs e)
    {
        object a = _calcDataGridView.CurrentRow.Cells["AColumn"].Value;
        object b = _calcDataGridView.CurrentRow.Cells["BColumn"].Value;
        double aNumber = 0;
        double bNumber = 0;
        if (a != null)
            aNumber = Double.Parse(a.ToString());
        if (b != null)
            bNumber = Double.Parse(b.ToString());
        _calcDataGridView.CurrentRow.Cells["TotalColumn"].Value = aNumber + bNumber;
    }
}
+1
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U r Eval U, , .

A

<ItemTemplate>
 <%# Eval("A")%>
</ItemTemplate>

B

<ItemTemplate>
<%# Eval("B")%>
</ItemTemplate>


 <ItemTemplate>
<%# GetTotal(Eval("A"),Eval("B")) %>

 </ItemTemplate>


private string GetTotal(object A,object B)
{
return (A+B).ToString();
}

, .

0

localdatabase, SQL , Totaldataset.

, , , , .

Datacolumn column = new Datacolumn (); 
column.Columnname = "Total"; 
Totaldataset.Tables[0].Columns.["Total"].Expression = "a+b";
0

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