如何將值存儲在列表或數組中並將所有值綁定到數據表然后 gridview

Question

private void ListViewAddMethod(string fItem, string sItem, string tItem, string foItem)
    {
        List<ReportList> alstNames = new List<ReportList>();
        alstNames.Add(new ReportList(fItem, sItem, tItem, foItem));

        DataTable dt = new DataTable();

        dt.Columns.Add("Particulars", typeof(string));
        dt.Columns.Add("Amount", typeof(string));
        dt.Columns.Add("Particulars1", typeof(string));
        dt.Columns.Add("Amount1", typeof(string));

        foreach (var lstNames in alstNames)
        {
            // Add new Row - inside the foreach loop - to enable creating new row for each object.
            DataRow row = dt.NewRow();
            row["Amount"] = fItem;
            row["Particulars"] = sItem;
            row["Particulars1"] = tItem;
            row["Amount1"] = foItem;
            dt.Rows.Add(row);

            dgvProfitAndLoss.DataSource = alstNames;
            dgvProfitAndLoss.DataBind();
        }

    }

這僅返回最近添加的行並忽略其他行。 如何從傳遞給方法的參數創建數組並將它們綁定到 gridview？

Answer 1

你的代碼看起來不太好。 首先，您正在對alstNames進行循環，並在此循環的每次迭代中將其綁定到 gridview 中。 其次，您不需要DataTable將其綁定到網格中，您的代碼只是在heap創建一個 DataTable ，添加一些 Rows 並將其保留到Garbage Collector中刪除它，您甚至沒有使用它。 Third, considering you are doing a method to add a new item on the GRidView, remove the initilization of your list to the scope of your class and keep it a valid instance (or static one if it is the case):

// declare the list output of the method
private private List<ReportList> alstNames = new List<ReportList>();

private void ListViewAddMethod(string fItem, string sItem, string tItem, string foItem)
{    
    // add the ReportList on the list
    alstNames.Add(new ReportList(fItem, sItem, tItem, foItem));

    // bind it on the gridView
    dgvProfitAndLoss.DataSource = alstNames;
    dgvProfitAndLoss.DataBind();
}