[英]how to perform sorting operation for a grid view using linq,?
我如何做到這一點(下面的代碼),但它引發以下錯誤。
錯誤:
the type arguments for method 'System.Linq.Enumerable.OrderBy<TSource,TKey>(System.Collections.Generic.IEnumerable<TSource>,
System.Func<TSource,TKey>, System.Collections.Generic.IComparer<TKey>)'
cannot be inferred from the usage.
碼:
gridview1.DataSource = (from bk in bookList
join ordr in bookOrders
on bk.BookID equals ordr.BookID
select new
{
BookID = bk.BookID,
BookNm = bk.BookNm,
PaymentMode = ordr.PaymentMode
}).AsQueryable().OrderBy(e.SortExpression,e.SortDirection);
您正在將基於字符串的排序機制(GridView.Sorting事件)與Linq(基於lambda表達式的排序)混合在一起。
最后我做了以下
protected void gridview1_Sorting(object sender, GridViewSortEventArgs e)
{
int p = int.Parse(Session["p"].ToString());
p++;
Session["p"] = p;
if (p % 2 == 0)
{
var A = from bk in bookList
join ordr in bookOrders
on bk.BookID equals ordr.BookID
select new
{
BookID = bk.BookID,
BookNm = bk.BookNm,
PaymentMode = ordr.PaymentMode
};
gridview1.DataSource = A.OrderBy(x => x.BookID);
gridview1.DataBind();
}
else
{
var A = from bk in bookList
join ordr in bookOrders
on bk.BookID equals ordr.BookID
select new
{
BookID = bk.BookID,
BookNm = bk.BookNm,
PaymentMode = ordr.PaymentMode
};
gridview1.DataSource = A.OrderByDescending(x=>x.BookID);
gridview1.DataBind();
}
}
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