ASP.NET中大量数据的分页、排序与过滤

来源：互联网发布：清朝历史书知乎编辑：程序博客网时间：2024/04/29 09:08

1、背景

在ASP.NET中通常是用GridView显示数据，然而如果要显示大量数据，一次性的取得所有的数据d的方法指定是不行的。

2、解决方法

在分页的时候请求当页的数据，排序的时候请求排序后的当页数据，过滤的时候显示过滤后的数据。

因此服务端要提供排序、分页以及过滤的参数，在每一次请求的时候传递相应条件返回相应的数据。

        public List<DeviceState> GetDeviceStateList(string sortExpression, int index, int size, bool isPrinterOutOfPaper,            bool isNetworkError, bool isHardwareError, string startDeviceID, string endDeviceID, string deviceType,            string version, string startRefreshInterval, string endRefreshInterval, DateTime startPowerOn, DateTime endPowerOn, DateTime startPowerOff,            DateTime endPowerOff, string startVolume, string endVolume)        {            return ChannelManager.Instance.DeviceService.GetDeviceStateList(                new GetDeviceStateListRequest()            {                SortExpression = sortExpression,                Index = index,                Count = size,                Filter = new FilterDescription()                 {                     IsPrinterOutOfPaper = isPrinterOutOfPaper,                     IsHardwareError = isHardwareError,                     IsNetworkError = isNetworkError,                     StartDeviceID = startDeviceID,                    EndDeviceID = endDeviceID,                    DeviceType = deviceType,                    Version = version,                     StartRefreshInterval = Convert.ToInt32(startRefreshInterval),                    EndRefreshInterval = Convert.ToInt32(endRefreshInterval),                    StartPowerOn = startPowerOn,                    EndPowerOn = endPowerOn,                    StartPowerOff = startPowerOff,                    EndPowerOff = endPowerOff,                    StartVolume = Convert.ToDouble(startVolume),                     EndVolume = Convert.ToDouble(endVolume)                }            });         }

为了方便使用，我们可以使用ObjectDataSource配合GridView调用该函数，ObjectDataSource内置了对分页、排序的参数传递，但是对于排序需要写格外的SelectParameter传递数据，例如：

                <asp:ObjectDataSource ID="DeviceStateDataSource" runat="server" EnablePaging="True"                    MaximumRowsParameterName="size" SelectCountMethod="GetDeviceCount" SelectMethod="GetDeviceStateList"                    StartRowIndexParameterName="index" TypeName="ICardPay.Web.DeviceManagerClient"                    SortParameterName="sortExpression">                    <SelectParameters>                        <asp:ControlParameter Name="isPrinterOutOfPaper" ControlID="IsOutOfPaperCheckBox"                            PropertyName="Checked" />                        <asp:ControlParameter Name="isNetworkError" ControlID="IsNetworkErrorCheckBox" PropertyName="Checked" />                        <asp:ControlParameter Name="isHardwareError" ControlID="IsHardwareErrorCheckBox"                            PropertyName="Checked" />                        <asp:ControlParameter Name="startDeviceID" ControlID="DeviceIDFromTextBox" PropertyName="Text" />                        <asp:ControlParameter Name="endDeviceID" ControlID="DeviceIDToTextBox" PropertyName="Text" />                        <asp:ControlParameter Name="deviceType" ControlID="DeviceTypeTextBox" PropertyName="Text" />                        <asp:ControlParameter Name="version" ControlID="VersionTextBox" PropertyName="Text" />                        <asp:ControlParameter Name="startRefreshInterval" ControlID="RefreshIntervalFromTextBox"                            PropertyName="Text" />                        <asp:ControlParameter Name="endRefreshInterval" ControlID="RefreshIntervalToTextBox"                            PropertyName="Text" />                        <asp:ControlParameter Name="startPowerOn" ControlID="TimeSelector1" PropertyName="Date" />                        <asp:ControlParameter Name="endPowerOn" ControlID="TimeSelector2" PropertyName="Date" />                        <asp:ControlParameter Name="startPowerOff" ControlID="TimeSelector3" PropertyName="Date" />                        <asp:ControlParameter Name="endPowerOff" ControlID="TimeSelector4" PropertyName="Date" />                        <asp:ControlParameter Name="startVolume" ControlID="VolumeTextBox1" PropertyName="Text" />                        <asp:ControlParameter Name="endVolume" ControlID="VolumeTextBox2" PropertyName="Text" />                    </SelectParameters>                </asp:ObjectDataSource>

最后GridView的写法如下：

                <asp:UpdatePanel runat="server">                    <ContentTemplate>                        <asp:GridView ID="DeviceStateGridView" runat="server" AllowPaging="True" PageSize="15"                            AllowSorting="true" Width="100%" OnRowCreated="DeviceStateGridViewRowCreated"                            AutoGenerateColumns="False" DataSourceID="DeviceStateDataSource" OnDataBound="DeviceStateGridDataBound">                            <Columns>                                <asp:TemplateField>                                    <HeaderTemplate>                                        <asp:CheckBox ID="SelectAllCheckBox" runat="server" AutoPostBack="true" OnCheckedChanged="SelectAllCheckBoxCheckedChanged" />                                    </HeaderTemplate>                                    <ItemTemplate>                                        <asp:CheckBox ID="SelectCheckBox" runat="server" AutoPostBack="true" OnCheckedChanged="SelectCheckBoxCheckedChanged" />                                    </ItemTemplate>                                </asp:TemplateField>                                <asp:BoundField DataField="DeviceID" HeaderText="编号" SortExpression="DeviceID" />                             </Columns>                            <EmptyDataTemplate>                                <p>                                    满足条件的数据不存在！</p>                            </EmptyDataTemplate>                        </asp:GridView>                    </ContentTemplate>                </asp:UpdatePanel>