尝试在排序数据网格视图列中使用单个条件

Question

如果我单击数据网格视图列标题，我将使用以下函数，整个数据网格视图列将被排序....

private void dgvproducts_ColumnHeaderMouseClick(object sender, DataGridViewCellMouseEventArgs e)
{
   if (order == "d")
   {
        //order by ascending
        order = "a";
       dgvproducts.DataSource = dbcontext.products
           .GroupBy(x => x.product_Id)
           .Select(a => new
             {
                    productid = a.Key,
                    prouctnam = a.FirstOrDefault().product_Name,
                    productimage = a.FirstOrDefault().product_Image,
                    productdescr = a.FirstOrDefault().product_Description,
                    stockavailable = a.LongCount(),
                    productprice = a.FirstOrDefault().product_Price
             }).OrderBy(a=>a.prouctnam).ToList();
    }
    else
    {
        // order by descending
        order = "d";
        dgvproducts.DataSource = dbcontext.products
            .GroupBy(x => x.product_Id)
            .Select(a => new
         {
                  productid = a.Key,
                  prouctnam = a.FirstOrDefault().product_Name,
                  productimage = a.FirstOrDefault().product_Image,
                  productdescr = a.FirstOrDefault().product_Description,
                  stockavailable = a.LongCount(),
                  productprice = a.FirstOrDefault().product_Price
         }).OrderByDescending(a => a.prouctnam).ToList();

    }
}    

这工作正常....

我想要的是，有没有可能一次检查单个条件和绑定数据网格视图...

而不是做两次......

非常感谢您的任何想法......

Answer 1

您可以重构并仅在以后应用订单部分 - 这样可以避免大部分重复代码：

var products = dbcontext.products
                        .GroupBy(x => x.product_Id)
                        .Select(a => new
                        {
                            productid = a.Key,
                            prouctnam = a.FirstOrDefault().product_Name,
                            productimage = a.FirstOrDefault().product_Image,
                            productdescr = a.FirstOrDefault().product_Description,
                            stockavailable = a.LongCount(),
                            productprice = a.FirstOrDefault().product_Price
                        });

if (order == "d")
{
    order = "a";
    dgvproducts.DataSource = products.OrderBy(a=>a.prouctnam).ToList();
}
else
{
    order = "d";
    dgvproducts.DataSource = products.OrderByDescending(a=>a.prouctnam).ToList();
}