好吧,我知道这真的没有那么难,但我找不到任何信息。我在页面上有一个 gridview,我正在根据用户选择的日期范围(下拉列表)填充数据。当用户单击按钮时,我填充 gridview 并显示它。这一切都是使用 Linq to Sql 完成的。我还需要实现分页和排序。请帮忙!!!下面是我的按钮点击事件......我愿意接受任何让这个工作正常的建议
protected void btnGenerate_Click(object sender, EventArgs e)
{
int dateRange =0;
if (rbDateList.Checked)
{
switch (ddlDateRange.SelectedIndex)
{
case 0:
dateRange = 30;
break;
case 1:
dateRange = 60;
break;
case 2:
dateRange = 90;
break;
default:
dateRange = 30;
break;
}
}
GYTDataContext gt = new GYTDataContext();
var productList = from o in gt.PurchaseOrderDetails
join p in gt.Products on o.ProductId equals p.ProductId
join h in gt.PurchaseOrderHeaders on o.PurchaseOrderId equals h.PurchaseOrderId
where h.OrderDate>DateTime.Now.AddDays(-dateRange)
group o by o.ProductId into orderedItems
select new
{
orderedItems.Key,
QuantityOrdered = orderedItems.Sum(s => s.OrderQuantity)
};
var totalOrderInfo = from p in productList
join prod in gt.Products
on p.Key equals prod.ProductId
select new
{
prod.Reference,
UnitPrice = prod.Price,
prod.ManufacturerProductId,
p.QuantityOrdered,
TotalCost = prod.Price * Convert.ToInt32(p.QuantityOrdered)
};
gvOrderReport.DataSource = totalOrderInfo;
gvOrderReport.DataBind();
gvOrderReport.Visible = true;
最佳答案
我遇到了和你一样的问题。 linqdatasource 的大多数示例,ilustare WhereParameters > controlparameter 功能很酷但不是那么强大。
答案很简单: 使用 LinqDataSource 并实现“onselecting”事件传递您想要的任何类型的数据。
这是一个具有完整过滤-分页-排序功能的简短示例 (另请注意,填充的 sql 是最优的,每次只请求前 10 条记录)
ASPX:
<asp:TextBox ID="txtLastName" runat="server"></asp:TextBox>
<asp:Button ID="btnFilter" runat="server" Text="Filter"
onclick="btnFilter_Click"/>
<asp:LinqDataSource ID="LinqDataSource1" runat="server"
onselecting="LinqDataSource1_Selecting">
</asp:LinqDataSource>
<asp:GridView ID="GridView1" runat="server" AllowPaging="True"
AllowSorting="True" AutoGenerateColumns="False" DataSourceID="LinqDataSource1">
<Columns>
<asp:BoundField DataField="FirstName" HeaderText="FirstName" ReadOnly="True"
SortExpression="FirstName" />
<asp:BoundField DataField="MiddleName" HeaderText="MiddleName" ReadOnly="True"
SortExpression="MiddleName" />
<asp:BoundField DataField="LastName" HeaderText="LastName" ReadOnly="True"
SortExpression="LastName" />
</Columns>
</asp:GridView>
代码隐藏:
protected void LinqDataSource1_Selecting(object sender, LinqDataSourceSelectEventArgs e)
{
var ctx = new LinqDataSource.DBDataContext();
IQueryable<Customer> customers = ctx.Customers;
if (!String.IsNullOrEmpty(txtLastName.Text))
customers = customers.Where ( c => c.LastName.Contains(txtLastName.Text));
e.Result = customers;
}
protected void btnFilter_Click(object sender, EventArgs e)
{
GridView1.DataBind();
}
关于c# - asp.net gridview 分页和排序与 linq to sql 自定义 linq 语句,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/5669516/