在gridview中查找行的单元格并在RowDataBound上执行某些操作

Posted 2021-05-06

我想只在OnRowDataBound事件上将GridView行中的单个单元格设置为Gray（如果是读者HasRows）。代码段会更改整个列颜色而不是单个单元格。例如：在图像中我只希望“Jan”旁边的单元格为灰色。

protected void setcolor(object sender, GridViewRowEventArgs e )
            {
                if (e.Row.RowType == DataControlRowType.DataRow)
                {               
                    if (txtShopBranch.Text == "Area1")
                        {
                            int index = e.Row.RowIndex;
                            string checkdayone = "SELECT one FROM tblregulardays WHERE  months = 'Jan'  AND shopbranch = 'Area1' AND one = '1'";
                            NpgsqlCommand findDayOne = new NpgsqlCommand (checkdayone, con);
                            con.Open();
                            NpgsqlDataReader reader = findDayOne.ExecuteReader();
                            if(reader.HasRows)
                                {
                                    e.Row.Cells[32].BackColor = System.Drawing.Color.Gray;
                                }
                            else
                                {   
                                    e.Row.Cells[32].BackColor = System.Drawing.Color.White;
                                }
                            con.Close();
                    }

                }
            }

答案

您对每一行使用相同的静态SQL查询：

string checkdayone = @"SELECT one FROM tblregulardays 
                       WHERE  months = 'Jan'  
                          AND shopbranch = 'Area1' 
                          AND one = '1'";

所以当然会产生相同的结果。您必须使用参数化查询。也许：

string month = e.Row.Cells[31].Text.Trim();

string checkdayone = @"SELECT one FROM tblregulardays 
                       WHERE  months = @Month  
                          AND shopbranch = 'Area1' 
                          AND one = '1'";

NpgsqlCommand findDayOne = new NpgsqlCommand (checkdayone, con);
findDayOne.Parameters.AddWithValue("@Month", month);