在Datagridview中改变数量值,价格也会改变.怎么可能?哪个事件会做这个.CellEndEdit已被使用

本文关键字:改变 事件 Datagridview CellEndEdit 怎么可能 | 更新日期: 2023-09-27 17:53:31

我想在Datagridview中改变数量值,它也会改变价格。这怎么可能?使用c# windows窗体。CellEndEdit已被其他单元格(productname)使用。

private void dataGridViewSalesForm_CellEndEdit(object sender, DataGridViewCellEventArgs e)
{
    try
    {
        string MatchingProduct = dataGridViewSalesForm.Rows[0].Cells[1].Value.ToString();
        for (int i = 0; i < objArrayList.Count; i++)
        {
            if (objArrayList[i].ToString().ToLower().StartsWith(MatchingProduct.ToLower()))
            {
                dataGridViewSalesForm.Rows[0].Cells[1].Value = objArrayList[i].ToString();
                break;
            }
        }
    }
    catch (Exception ex)
    {
        MessageBox.Show(ex.Message);
    }
    /*connection for loading brandname from brandtable*/
    string get_strProductName = dataGridViewSalesForm.Rows[0].Cells[1].Value.ToString();
    string quantity = "1";
    SqlConnection conn = new SqlConnection(connstr);
    try
    {
        conn.Open();
        string qry = "SELECT T_Inv_Brands.brand_name FROM T_Inv_Products INNER JOIN T_Inv_Brands ON T_Inv_Products.brand_id = T_Inv_Brands.brand_id WHERE     T_Inv_Products.prod_name ='" + get_strProductName + "'";
        SqlCommand cmd = new SqlCommand(qry, conn);
        SqlDataAdapter da = new SqlDataAdapter(cmd);
        DataSet ds = new DataSet();
        da.Fill(ds);
        dataGridViewSalesForm.Rows[0].Cells[2].Value = ds.Tables[0].Rows[0]["brand_name"].ToString();
        dataGridViewSalesForm.Rows[0].Cells[3].Value = quantity;
        conn.Close();
    }
    catch (Exception ex)
    {
        MessageBox.Show(ex.Message);
    }

    /*connection for loading retailprice  from producttable*/
    SqlConnection connection = new SqlConnection(connstr);
    try
    {
        conn.Open();
        string qry = "SELECT  retailprice FROM  T_Inv_Products WHERE prod_name = '" + get_strProductName + "'";
        SqlCommand cmd = new SqlCommand(qry, connection);
        SqlDataAdapter da = new SqlDataAdapter(cmd);
        DataTable dt = new DataTable();
        da.Fill(dt);
        dataGridViewSalesForm.Rows[0].Cells[4].Value = Convert.ToDouble(dt.Rows[0]["retailprice"].ToString());


    }
    catch (Exception ex)
    {
        MessageBox.Show(ex.Message);
    }
    //double quantityload = Convert.ToDouble(dataGridViewSalesForm.Rows[0].Cells[3].Value.ToString());
    //double pricefetch = Convert.ToDouble(dataGridViewSalesForm.Rows[0].Cells[4].Value.ToString());
    //double result = quantityload * pricefetch;
    //dataGridViewSalesForm.Rows[0].Cells[4].Value = result.ToString();
}

在Datagridview中改变数量值,价格也会改变.怎么可能?哪个事件会做这个.CellEndEdit已被使用

您似乎认为可以仅为一个单元格或列使用事件。相反,您需要以这样一种方式编码您的事件,即所有必需的单元格和/或列都获得它们自己的逻辑。

它有助于将代码分成更小的部分,并使用有用的名称记录它们包含的逻辑!

下面是一个具有两个分支的示例,一个用于某个单元格,另一个用于某个列。我把DataGridViewCellEventArgs传递出去,这样函数就可以访问DataGridView DGV,就像真实事件一样。当然,您可以根据需要对其进行扩展:

int quantityColumnIndex = 3;  // use your own numbers..
int currencyColumnIndex = 1;  // ..and names!!
int currencyRowIndex = 0;
int pricePerUnitColumnIndex = 7;
int totalPriceColumnIndex = 8;
int totalBasePriceColumnIndex = 4;
private void DGV_CellEndEdit(object sender, DataGridViewCellEventArgs e)
{
    if (e.ColumnIndex == quantityColumnIndex) doPriceCalc(e);
    else if (e.ColumnIndex == currencyColumnIndex && e.RowIndex == currencyRowIndex) 
         doAllCalc(e);
}
void doPriceCalc(DataGridViewCellEventArgs e)
{
    // 1st example
    DGV[totalPriceColumnIndex, e.RowIndex].Value =
        (int)DGV[quantityColumnIndex, e.RowIndex].Value *
        (decimal)DGV[pricePerUnitColumnIndex, e.RowIndex].Value;
}
void doAllCalc(DataGridViewCellEventArgs e)
{
    // 2nd example
    decimal currency = (decimal) DGV[currencyColumnIndex,currencyRowIndex ].Value;
    for (int row = 0; row < DGV.Rows.Count; row++)
        DGV[pricePerUnitColumnIndex, e.RowIndex].Value =
            (decimal)DGV[totalBasePriceColumnIndex, e.RowIndex].Value * currency;
}

请注意,我已经根据它们的索引对列进行了索引。您也可以按名称对它们进行索引,例如:DGV[ "PricePerUnit", e.rowIndex]