Question

private void btnsave_Click(object sender, EventArgs e)
{
    try
    {
        for (int i = 0; i < itemgrid.RowCount - 1; i++ )
        {
            dru.insertdata("insert into tbl_godown (date,category,product,quantity,MRP,salesrate,margin,Total,vendor,unit)values('" + itemgrid.Rows[i].Cells["Column1"].Value.ToString() + "','" + itemgrid.Rows[i].Cells["Column2"].Value.ToString() + "','" + itemgrid.Rows[i].Cells["Column3"].Value.ToString() + "','" + itemgrid.Rows[i].Cells["Column4"].Value.ToString() + "','" + double.Parse(itemgrid.Rows[i].Cells["Column5"].Value.ToString()) + "','" + Convert.ToDouble(itemgrid.Rows[i].Cells["Column6"].Value.ToString()) + "','" + Convert.ToDouble(itemgrid.Rows[i].Cells["Column7"].Value.ToString()) + "','" + Convert.ToDouble(itemgrid.Rows[i].Cells["Column8"].Value.ToString()) + "','" + Convert.ToDouble(itemgrid.Rows[i].Cells["Column9"].Value.ToString()) + "','" + Convert.ToDouble(itemgrid.Rows[i].Cells["Column10"].Value.ToString()) + "') ");
            MessageBox.Show("Insert Successfully");
        }
    }
    catch(Exception ex)
    {
        MessageBox.Show(ex.Message);
    }
}

将数据从datagridview插入数据库，datagridview的名称是itemgrid

private void txtquantity_TextChanged(object sender, EventArgs e)
{
    mulfunc();
}

private void txtrate_TextChanged(object sender, EventArgs e)
{
        mulfunc();
        marginfunc();
}

private void txtMRP_TextChanged(object sender, EventArgs e)
{
        marginfunc();
}

/// <summary>
/// margin calculations(sales rate-vendor rate = margin)
/// </summary>
public void marginfunc()
{
    try
    {
        double val1;
        double val2;

        if (!double.TryParse(txtMRP.Text, out val1) || !double.TryParse(txtrate.Text, out val2))
                return;

        double val3 = val2 - val1;

        // Here you define what TextBox should show the multiplication result
        txtmargin.Text = val3.ToString();
    }
    catch(Exception ex)
    {
        MessageBox.Show(ex.Message);
    }
}

/// <summary>
/// quantity * sales rate
/// </summary>
public void mulfunc()
{
    try 
    {
        double val1;
        double val2;

        if (!double.TryParse(txtquantity.Text, out val1) || !double.TryParse(txtrate.Text, out val2))
                return;

        double val3 = val1 * val2;

        // Here you define what TextBox should show the multiplication result
        txttotal.Text = val3.ToString();
    }
    catch (Exception ex)
    {
        MessageBox.Show(ex.Message);
    }
}

public void clear()
{
    cmbunit.Text = "";
    txtprod.Text = "";
    txtquantity.Text = "";
    txtMRP.Text = "";
    txtrate.Text = "";
    txtmargin.Text = "";
    txttotal.Text = "";
    txtvendor.Text = "";
}

Answer 1

首先，我不建议构建动态SQL以这种方式执行INSERT，因为这会带来SQL注入风险（https://en.wikipedia.org/wiki/SQL_injection）。但如果您的代码是非生产的（即您不关心上述风险）请尝试使用此模式......

        {
            for (int i = 0; i < itemgrid.RowCount - 1; i++ )
            {
                var sInsertSQL = string.Format(@"
insert tbl_godown (
    date,category,product,quantity,MRP,salesrate,margin,Total,vendor,unit
    )
    values(
        '{0}','{1}','{2}','{3}','{4}',{5},{6},{7},{8},{9}
        )'",
                    itemgrid.Rows[i].Cells["Column1"].Value,
                    itemgrid.Rows[i].Cells["Column2"].Value,
                    itemgrid.Rows[i].Cells["Column3"].Value,
                    itemgrid.Rows[i].Cells["Column4"].Value,
                    Convert.ToDouble(itemgrid.Rows[i].Cells["Column5"].Value),
                    Convert.ToDouble(itemgrid.Rows[i].Cells["Column6"].Value),
                    Convert.ToDouble(itemgrid.Rows[i].Cells["Column7"].Value),
                    Convert.ToDouble(itemgrid.Rows[i].Cells["Column8"].Value),
                    Convert.ToDouble(itemgrid.Rows[i].Cells["Column9"].Value),
                    Convert.ToDouble(itemgrid.Rows[i].Cells["Column10"].Value)
                    );
                dru.insertdata(sInsertSQL);
                MessageBox.Show("Insert Successfully");
            }
        }
        catch(Exception ex)
        {
            MessageBox.Show(ex.Message);
        }

这是一种更容易阅读/调试的模式。您始终可以将sInsertSQL输出到直接窗格，然后复制/粘贴到SSMS中以找出错误。

输入字符串格式不正确c＃winform应用程序

1 个答案: