如何比较数据网格中的两行？

Question

我必须在第一个表中的表 de 用户选择要添加的行，并在每行中添加一个复选框，然后按下一个按钮在第一个表下添加行。但是我不希望已经添加的行被删除并再次添加。我只想添加尚未添加的行。这是我的代码

    protected void GetSelectedRecords(object sender, EventArgs e)
    {
        DataTable dt = new DataTable();

        dt.Columns.AddRange(new DataColumn[10] { new DataColumn("Marca"), new DataColumn("Designacion"), new DataColumn("Tipo"),
                                                new DataColumn("Referencia"), new DataColumn("Plazo"),new DataColumn("nombre_proveedor"),
                                                new DataColumn("cantidad_requerida"),new DataColumn("cantidad_pedida"), new DataColumn("cantidad_entregada"),
                                                new DataColumn("precio_unitario")});
        foreach (GridViewRow row in gvPurchases.Rows)
        {
            if (row.RowType == DataControlRowType.DataRow)
            {
                CheckBox chkRow = (row.Cells[2].FindControl("chkRow") as CheckBox);
                if (chkRow.Checked)
                {
                    string brand = (row.Cells[1].FindControl("lblMarca") as Label).Text;
                    string designation = (row.Cells[1].FindControl("lblDesignacion") as Label).Text;
                    string type = (row.Cells[1].FindControl("lblType") as Label).Text;
                    string reference = (row.Cells[1].FindControl("lblReference") as Label).Text;
                    string paymentDeadLine = (row.Cells[1].FindControl("lblPaymentDeadline") as Label).Text;
                    string supplier = drSupplier.SelectedItem.Text; 
                    string requiredQuantity = (row.Cells[1].FindControl("lblrequiredQuantity") as Label).Text; 
                    string requestedQuantity = (row.Cells[1].FindControl("lblRequestedQuantity") as Label).Text;
                    string deliveredQuantity = (row.Cells[1].FindControl("lblDeliveredQuantity") as Label).Text;
                    string unitPrice = (row.Cells[1].FindControl("lblUnitPrice") as Label).Text;

                    dt.Rows.Add(brand, designation, type, reference, paymentDeadLine, supplier, requestedQuantity, deliveredQuantity, deliveredQuantity, unitPrice);
                }
            }
        }
        gvPurchasesSelected.DataSource = dt;
        gvPurchasesSelected.DataBind();
    }

Answer 1

您可以在执行 dt.Rows.Add 之前检查使用 Linq 或执行 foreach 或您喜欢的任何迭代方法而不是 gvPurchasesSelected.Rows 并检查品牌、名称和类型是否相同（或组成的字段行的唯一标识符）。

我可能会这样做：

    if ( gvPurchasesSelected.Rows.Cast<DataGridViewRow>().Any(row => row.type == type && 
                                             row.brand == brand && 
                                             row.designation == designation))
        continue;
    else
        dt.Rows.Add(....)

希望这会有所帮助！