[英]how to perform sorting operation for a grid view using linq,?
How to perform sorting operation for a grid view .I have done this(below code) but it is throwing following error. 我如何做到这一点(下面的代码),但它引发以下错误。
Error: 错误:
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.
code: 码:
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);
You are mixing string-based sorting mechanism (GridView.Sorting event) with Linq (lambda expressions based sorting). 您正在将基于字符串的排序机制(GridView.Sorting事件)与Linq(基于lambda表达式的排序)混合在一起。
This article: Handle GridView.OnSorting() and create sorting expression dynamically using LINQ does what you want 本文: 处理GridView.OnSorting()并使用LINQ动态创建排序表达式可以满足您的要求
at last I have done the following 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();
}
}
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.