我在WinForms应用程序中遇到了一个问题，其中：
每当我第一次在我的组合框中选择一个项目时，随之而来的格式就会被应用。然而，在那之后，格式不再适用，我只是像下面的图片一样有空白单元格：

的数据

的
下面是我的代码：

int t = 0;
            foreach (DataGridViewRow row in dataGridView2.Rows)
            {
                row.Cells["toleranceMinDataGridViewTextBoxColumn"].Value = "";
                row.Cells["toleranceNomDataGridViewTextBoxColumn"].Value = "";
                row.Cells["toleranceMaxDataGridViewTextBoxColumn"].Value = "";

                row.Cells["toleranceMinDataGridViewTextBoxColumn"].ReadOnly = false;
                row.Cells["toleranceNomDataGridViewTextBoxColumn"].ReadOnly = false;
                row.Cells["toleranceMaxDataGridViewTextBoxColumn"].ReadOnly = false;

            }

            void creation()
            {
                dataGridView2.Columns.OfType<DataGridViewColumn>().ToList().ForEach(col => col.Visible = false);
                dataGridView2.Columns["lotDataGridViewTextBoxColumn"].Visible = true;
                dataGridView2.Columns["ItemDataGridViewTextBoxColumn"].Visible = true;
                dataGridView2.Columns["lotDataGridViewTextBoxColumn"].Visible = true;
                dataGridView2.Columns["ItemDataGridViewTextBoxColumn"].Visible = true;
                dataGridView2.Columns["toleranceMinDataGridViewTextBoxColumn"].Visible = true;
                dataGridView2.Columns["toleranceNomDataGridViewTextBoxColumn"].Visible = true;
                dataGridView2.Columns["toleranceMaxDataGridViewTextBoxColumn"].Visible = true;

                dataGridView2.Columns[$"toleranceMinDataGridViewTextBoxColumn"].DefaultCellStyle.BackColor = System.Drawing.Color.Wheat;
                dataGridView2.Columns[$"toleranceNomDataGridViewTextBoxColumn"].DefaultCellStyle.BackColor = System.Drawing.Color.Wheat;
                dataGridView2.Columns[$"toleranceMaxDataGridViewTextBoxColumn"].DefaultCellStyle.BackColor = System.Drawing.Color.Wheat;
            }

            creation();

            void creationitemsettolerances()
            {
                foreach (DataGridViewRow row in dataGridView2.Rows)
                {
                    row.Visible = false;
                }

                foreach (DataGridViewRow row in dataGridView2.Rows)
                {
                    if (!(row.Cells[$"{comboBox1.Text + comboBox2.Text}DataGridViewTextBoxColumn"].Value?.ToString() is ""))
                    {
                        row.Visible = true; ;
                    }

                }

                var result = from DataGridViewRow row in dataGridView2.Rows where row.Visible select row;

                foreach (DataGridViewRow row in result)
                {
                    string[] splitter = new string[3];
                    t++;
                    string a = row.Cells[$"{comboBox1.Text + comboBox2.Text}DataGridViewTextBoxColumn"].Value?.ToString();
                    if (a.Contains('-'))
                    {
                        splitter = a.Split('-');
                        row.Cells["toleranceMinDataGridViewTextBoxColumn"].Value = splitter[0];
                        row.Cells["toleranceNomDataGridViewTextBoxColumn"].Value = splitter[1];
                        try { 
                            row.Cells["toleranceMaxDataGridViewTextBoxColumn"].Value = splitter[2];
                        }catch(Exception ex) { Debug.WriteLine(ex); }

                    }
                    else
                    {
                        row.Cells["toleranceNomDataGridViewTextBoxColumn"].Value = a;

                    }
                }
            }

            creationitemsettolerances();

            void formattagedestolerances()
            {
                var result = from DataGridViewRow row in dataGridView2.Rows where row.Visible select row;
                foreach (var row in result)
                {
                    if ((row.Cells["toleranceMinDataGridViewTextBoxColumn"].Value?.ToString() is "") && (row.Cells["toleranceMaxDataGridViewTextBoxColumn"].Value?.ToString() is ""))
                    {
                        string a = row.Cells["toleranceNomDataGridViewTextBoxColumn"].Value?.ToString();
                        var cell = (DataGridViewTextBoxCellEx)row.Cells["toleranceMinDataGridViewTextBoxColumn"];
                        cell.Value = a;
                        cell.ColumnSpan = 3;
                        cell.Style.Alignment = DataGridViewContentAlignment.MiddleCenter;
                    }

                }
            }
            formattagedestolerances();


            void definitiondeslots()
            {
                int deb1 = 0;
                int deb2 = 0;
                int fin1 = 0;
                int fin2 = 0;
                int deb3 = 0;
                int fin3 = 0;


                var result = from DataGridViewRow row in dataGridView2.Rows where row.Visible select row;

                fin3 = result.Count() ;

                foreach (var row in result)
                {
                    if (row.Cells["TolerancesDataGridViewTextBoxColumn"].Value?.ToString() is "1")
                    {
                        
                         if ((row.Cells["lotDataGridViewTextBoxColumn"].Value?.ToString() is "2") && (deb2 == 0))
                        {
                            deb2 = row.Index;
                            fin1 = row.Index - 1;
                        }
                        else if ((row.Cells["lotDataGridViewTextBoxColumn"].Value?.ToString() is "3") && (deb3 == 0))
                        {
                            fin2 = row.Index - 1;
                            deb3 = row.Index;
                        }

                    }
                    else if(row.Cells["TolerancesDataGridViewTextBoxColumn"].Value?.ToString() is "2")
                    {
                        if ((row.Cells["lotDataGridViewTextBoxColumn"].Value?.ToString() is "1") && (deb1 == 0))
                        {
                            deb1 = row.Index;
                        }
                        else if ((row.Cells["lotDataGridViewTextBoxColumn"].Value?.ToString() is "2") && (deb2 == 0))
                        {
                            deb2 = row.Index;
                            fin1 = row.Index - 1;
                        }
                        else if ((row.Cells["lotDataGridViewTextBoxColumn"].Value?.ToString() is "3") && (deb3 == 0))
                        {
                            fin2 = row.Index - 1;
                            deb3 = row.Index;
                        }
                    }
                    else if (row.Cells["TolerancesDataGridViewTextBoxColumn"].Value?.ToString() is "3")
                    {
                        if ((row.Cells["lotDataGridViewTextBoxColumn"].Value?.ToString() is "1") && (deb1 == 0))
                        {
                            deb1 = row.Index;
                        }
                        else if ((row.Cells["lotDataGridViewTextBoxColumn"].Value?.ToString() is "2") && (deb2 == 0))
                        {
                            deb2 = row.Index;
                            fin1 = row.Index - 1;
                        }
                        else if ((row.Cells["lotDataGridViewTextBoxColumn"].Value?.ToString() is "3") && (deb3 == 0))
                        {
                            fin2 = row.Index - 1;
                            deb3 = row.Index;
                        }
                    }
                }

                var cell1 = (DataGridViewTextBoxCellEx)dataGridView2.Rows[deb1].Cells["lotDataGridViewTextBoxColumn"];
                cell1.RowSpan = fin1 - deb1+1;
                var cell2 = (DataGridViewTextBoxCellEx)dataGridView2.Rows[deb2].Cells["lotDataGridViewTextBoxColumn"];
                cell2.RowSpan = fin2 - deb2+1;
                var cell3 = (DataGridViewTextBoxCellEx)dataGridView2.Rows[deb3].Cells["lotDataGridViewTextBoxColumn"];
                cell3.RowSpan = fin3 -deb3+2;

            }

            definitiondeslots();

            void donneesdemesures()
            {
                listBox1.Items.Clear();

                List<int> valeurs = new List<int>();
                var result = from DataGridViewRow row in dataGridView2.Rows where row.Visible select row;
                foreach (var row in result)
                {
                    string a = row.Cells[$"donnees{comboBox1.Text + comboBox2.Text}DataGridViewTextBoxColumn"].Value?.ToString();
                    if (!(a is ""))
                    {
                        valeurs.Add(Convert.ToInt32(a));
                    }
                    listBox1.Items.Add(a);

                }
                int b = valeurs.Max();

                for (int i = 1; i <= b; i++)
                {
                    dataGridView2.Columns.Add($"Test{i}", "Donnee");

                }

                foreach (var row in result)
                {
                    for (int i = 1; i <= b; i++)
                    {
                        row.Cells[$"Test{i}"] = new DataGridViewTextBoxCellEx();
                    }
                }
                int m = 0;
                foreach (var row in result)
                {
                    for (int i = 1; i <= b; i++)
                    {
                        row.Cells[$"Test{i}"].Style.BackColor = System.Drawing.Color.Gray;
                    }

                    for (int i = 1; i <= valeurs[m]; i++)
                    {
                        row.Cells[$"Test{i}"].Style.BackColor = System.Drawing.Color.White;

                    }
                    m++;

                }

            }
            donneesdemesures();

        }

字符串
如果有人能帮上忙我会很感激的。