ASPxGridView移至下一页时会丢失数据
[英]ASPxGridView lose data when moving to the next page
问题描述
I am binding an ASPxGridView to an SqlDataSource: 
我将ASPxGridView绑定到SqlDataSource：
protected void search_ServerClick(object sender, EventArgs e)
{
string selectCommand = @"SELECT dbo.TaskSchedularTb.UniqueID, dbo.UserTb.UserName, dbo.TaskSchedularTb.UserID, dbo.TaskTypeTb.TypeID, dbo.TaskTypeTb.TaskType,
dbo.TaskLabelTb.LabelID, dbo.TaskLabelTb.Label, dbo.TaskStatusTb.StatusID, dbo.TaskStatusTb.Status, dbo.ProjectTb.ProjectID, dbo.ProjectTb.ProjectName,
dbo.TaskSchedularTb.StartDate, dbo.TaskSchedularTb.EndDate, dbo.TaskSchedularTb.AllDay, dbo.TaskSchedularTb.Subject, dbo.TaskSchedularTb.Location,
dbo.TaskSchedularTb.Description,dbo.UserTb.userImagePath
FROM dbo.TaskSchedularTb INNER JOIN
dbo.UserTb ON dbo.TaskSchedularTb.UserID = dbo.UserTb.UserID INNER JOIN
dbo.TaskTypeTb ON dbo.TaskSchedularTb.TaskType = dbo.TaskTypeTb.TypeID INNER JOIN
dbo.TaskLabelTb ON dbo.TaskSchedularTb.Label = dbo.TaskLabelTb.LabelID INNER JOIN
dbo.ProjectTb ON dbo.TaskSchedularTb.ResourceID = dbo.ProjectTb.ProjectID INNER JOIN
dbo.TaskStatusTb ON dbo.TaskSchedularTb.Status = dbo.TaskStatusTb.StatusID
where dbo.TaskSchedularTb.UserID = " + int.Parse(Session["userID"].ToString());
if (dfrom.Value != "" && dto.Value != "")
{
selectCommand += " AND dbo.TaskSchedularTb.StartDate >='" + Convert.ToDateTime(dfrom.Value).Year.ToString() + "-" + Convert.ToDateTime(dfrom.Value).Month.ToString() + "-" +
Convert.ToDateTime(dfrom.Value).Day.ToString() + "'";
selectCommand += " AND dbo.TaskSchedularTb.EndDate <='" + Convert.ToDateTime(dto.Value).Year.ToString() + "-" + Convert.ToDateTime(dto.Value).Month.ToString() + "-" +
Convert.ToDateTime(dto.Value).Day.ToString() + "'";
}
else if (dfrom.Value != "")
selectCommand += " AND dbo.TaskSchedularTb.StartDate ='" + Convert.ToDateTime(dfrom.Value).Year.ToString() + "-" + Convert.ToDateTime(dfrom.Value).Month.ToString() + "-" +
Convert.ToDateTime(dfrom.Value).Day.ToString() + "'";
else if(dto.Value != "")
selectCommand += " AND dbo.TaskSchedularTb.EndDate ='" + Convert.ToDateTime(dto.Value).Year.ToString() + "-" + Convert.ToDateTime(dto.Value).Month.ToString() + "-" +
Convert.ToDateTime(dto.Value).Day.ToString() + "'";
if (project.Value != "")
selectCommand += " AND dbo.TaskSchedularTb.ResourceID=" + project.Value.ToString();
if (selecttype.Value != "")
selectCommand += " AND dbo.TaskSchedularTb.TaskType=" + selecttype.Value.ToString();
if (status.Value != "")
selectCommand += " AND dbo.TaskSchedularTb.Status=" + status.Value.ToString();
SqlDataSource1.SelectCommandType = SqlDataSourceCommandType.Text;
SqlDataSource1.SelectCommand = selectCommand;
SqlDataSource1.DataBind();
ASPxGridView1.DataSourceID = "";
ASPxGridView1.DataSource = SqlDataSource1;
ASPxGridView1.KeyFieldName = "UniqueID";
ASPxGridView1.DataBind();
}
I tried to get the value of the Key in the HtmlRowPrepared event: 我试图在HtmlRowPrepared事件中获取Key的值：
protected void ASPxGridView1_HtmlRowPrepared(object sender, ASPxGridViewTableRowEventArgs e)
{
if (e.KeyValue != null)
uniqueID_var = e.KeyValue.ToString();
}
And when i moved to the next page the KeyValue become null and the data in the gridview loses. 当我移到下一页时，KeyValue变为null，并且gridview中的数据丢失。
The ascx file contains the following code ascx文件包含以下代码
<dx:ASPxGridView ID="ASPxGridView1" runat="server" AutoGenerateColumns="False" DataSourceID="SqlDataSource1" KeyFieldName="UniqueID" Theme="Moderno" Width="100%" OnHtmlRowPrepared="ASPxGridView1_HtmlRowPrepared">
<SettingsAdaptivity AdaptivityMode="HideDataCells">
</SettingsAdaptivity>
<Templates>
<DataRow>
<ul class="timeline">
<li id="page2">
<div class="main">
<!-- begin timeline-time -->
<div class="timeline-time">
<span class="date"><%# Eval("StartDate", "{0:d}") %>
</span><span class="time"><%# Eval("StartDate", "{0:t}") %></span>
</div>
<!-- end timeline-time -->
<!-- begin timeline-icon -->
<div class="timeline-icon">
<a href="javascript:;"> </a>
</div>
<!-- end timeline-icon -->
<!-- begin timeline-body -->
<div class="timeline-body">
<div class="timeline-header">
<span class="userimage">
<img alt="" src='<%# "assets/img/user/"+Eval("userImagePath") %>' />
</span><span class="pull-right text-muted">
<asp:HiddenField ID="taskID" Value='<%# Eval("UniqueID") %>' runat="server" />
<a href='<%# "taskAdd.aspx?action=Edit&id="+Eval("UniqueID") %>'><i class="fas fa-edit"></i></a></span><span class="username"><a href="javascript:;"><%# Eval("UserName") %></a><br />
<small>Project Name: <%# Eval("ProjectName") %></small> </span>
</div>
<div class="timeline-content">
<p>
<%# Eval("Subject")+" "+ Eval("Description") %>
</p>
</div>
<div class="timeline-likes">
<div class="stats-right">
<span class="stats-text"><%# "Status: "+Eval("Status") %></span> <span class="stats-text"><%# "Type: "+Eval("TaskType") %></span>
</div>
<div class="stats">
<span class="stats-total"><%# "Deadline: "+Eval("EndDate") %></span>
</div>
</div>
<div class="timeline-footer">
<div class="stats">
<span class="stats-total">Attachments: </span>
</div>
<%--<a class="m-r-15 text-inverse-lighter" href="javascript:;"><i class="fa fa-thumbs-up fa-fw fa-lg m-r-3"></i>Like</a> <a class="m-r-15 text-inverse-lighter" href="javascript:;"><i class="fa fa-comments fa-fw fa-lg m-r-3"></i>Comment</a> <a class="m-r-15 text-inverse-lighter" href="javascript:;"><i class="fa fa-share fa-fw fa-lg m-r-3"></i>Shae</a>--%><dx:ASPxDataView ID="ASPxDataView1" runat="server" AllowPaging="False" DataSourceID="SqlDataSource2" EnableTheming="True" Theme="Moderno" ItemSpacing="2px" Height="10%" Width="100%">
<SettingsTableLayout RowsPerPage="1" ColumnCount="6" />
<PagerSettings ShowNumericButtons="False" Visible="False">
</PagerSettings>
<ItemTemplate>
<a href='<%# System.Web.HttpContext.Current.Server.HtmlEncode(Eval("FilePath").ToString()) %>' target="_blank"><i class='fas fa-<%# fileType(Eval("FileType").ToString())%> fa-2x'></i></a>
</ItemTemplate>
<Paddings Padding="0px" />
<ContentStyle Border-BorderStyle="None">
<Paddings Padding="0px" />
</ContentStyle>
<ItemStyle Height="10%" Width="10%" Border-BorderStyle="None" HorizontalAlign="Center" />
</dx:ASPxDataView>
<asp:SqlDataSource ID="SqlDataSource2" runat="server" ConnectionString="<%$ ConnectionStrings:connectionString %>" SelectCommand="SELECT * FROM [TaskAttachmentTb] WHERE ([TaskSchedularID] = @TaskSchedularID)">
<SelectParameters>
<asp:FormParameter DefaultValue="1" FormField="taskID" Name="TaskSchedularID" Type="Int32" />
</SelectParameters>
</asp:SqlDataSource>
</div>
<div class="timeline-comment-box">
<div class="user">
<img src='<%# "assets/img/user/"+ session_user_image()%>' />
</div>
<div class="input">
<div class="input-group">
<input id="commentStr" runat="server" class="form-control rounded-corner" placeholder="Write a comment..." type="text" />
<span class="input-group-btn p-l-10">
<button id="btnComment" value='<%# Eval("UniqueID") %>' runat="server" class="btn btn-primary f-s-12 rounded-corner" type="button" onserverclick="btnComment_ServerClick">
Comment
</button>
<%--<input id="btnComment" type="button" value='Comment' runat="server" class="btn btn-primary f-s-12 rounded-corner" onserverclick="btnComment_ServerClick" />--%>
</span>
</div>
</div>
<div>
</div>
<%
List<Task.std_task_comments_get_Result> com_list = getComments();
foreach (Task.std_task_comments_get_Result lc in com_list)
{
string cdv = lc.CommentDate.Value.ToString();
string cmnt = lc.Comment.ToString();
string uiid = getCommentedUserImage(lc.UserID.ToString());
string cuv = getCommentedUserName(lc.UserID.ToString());
%>
<div class="user">
<img id="123" src='<%= "assets/img/user/"+uiid %>' />
</div>
<div class="input">
<div class="input-group">
<label id="commentUser" style="width: 100%;">
<%= cuv %></label>
<div id="commentDiv">
<%= cmnt %> <a href="javascript:;">1h</a>
</div>
</div>
</div>
<% }; %>
</div>
</div>
<!-- end timeline-body -->
</div>
</li>
</ul>
</DataRow>
</Templates>
<SettingsPager PageSize="1">
</SettingsPager>
<Settings GridLines="Horizontal" ShowColumnHeaders="False" />
<Columns>
<dx:GridViewCommandColumn VisibleIndex="0">
</dx:GridViewCommandColumn>
</Columns>
<Styles>
<PagerBottomPanel HorizontalAlign="Center">
</PagerBottomPanel>
<SearchPanel HorizontalAlign="Center">
</SearchPanel>
</Styles>
And the sql datasource in the ascx is: 而ascx中的sql数据源是：
<asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:connectionString %>" SelectCommand="std_taskScheduler_get_my" SelectCommandType="StoredProcedure">
<SelectParameters>
<asp:SessionParameter DefaultValue="2" Name="UserID" SessionField="userID" Type="Int32" />
</SelectParameters>
Is there any problem in the code above ? 上面的代码有什么问题吗？
1 个解决方案
解决方案1
0 2018-08-28 06:28:40
You need to bind your data on page load not just on your button click event. 您不仅需要在按钮单击事件上绑定数据，还需要在页面加载时绑定数据。 I suggest moving you binding logic out into its own method and calling on page_load and when you click your button. 我建议将绑定逻辑移到其自己的方法中，并在单击按钮时调用page_load。
Also look at using parameters when making calls to your database. 在调用数据库时，还要注意使用参数。 try not to concatenate sql code as it can lead to all sorts of issues such as sql injection 尽量不要串联sql代码，因为它可能导致各种问题，例如sql注入
if (IsPostBack){ // you may need a ispostback in you page load.
binddatamethod()
}
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