C# GridView排序只工作一次
我有一个网格,它只按升序排序一次。然后什么也没发生 aspx文件的代码:C# GridView排序只工作一次,c#,asp.net,sorting,gridview,gridview-sorting,C#,Asp.net,Sorting,Gridview,Gridview Sorting,我有一个网格,它只按升序排序一次。然后什么也没发生 aspx文件的代码: <asp:GridView ID="gdvSignatureLines" runat="server" CssClass="Grid1" AutoGenerateColumns="False" SkinID="PagedGridView" AllowPaging="True" AllowSorting="True" DataKeyNames="Id"
<asp:GridView ID="gdvSignatureLines" runat="server" CssClass="Grid1" AutoGenerateColumns="False"
SkinID="PagedGridView" AllowPaging="True" AllowSorting="True" DataKeyNames="Id"
onrowcommand="gdvSignatureLines_RowCommand"
onrowdeleting="gdvSignatureLines_RowDeleting"
onrowediting="gdvSignatureLines_RowEditing"
onsorting="gdvSignatureLines_Sorting"
onpageindexchanging="gdvSignatureLines_PageIndexChanging">
<PagerStyle CssClass="gridPager" HorizontalAlign="Right" />
<Columns>
<ucc:commandfieldcontrol headertext="Actions" showdeletebutton="true" buttontype="Image"
deleteimageurl="~/App_Themes/Default/images/delete.png" showeditbutton="true"
editimageurl="~/App_Themes/Default/images/edit.png" deleteconfirmationtext="Are you sure you want to delete?">
<ItemStyle HorizontalAlign="Center" Width="60px" />
</ucc:commandfieldcontrol>
<asp:BoundField DataField="SortOrder" HeaderText="Line" SortExpression="SortOrder" />
<asp:TemplateField HeaderText="Type" SortExpression="glTypeId">
<ItemTemplate>
<asp:Label ID="lblglTypeId" runat="server" Text='<%# Eval("GeneralLookup.LookupItem") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Label" SortExpression="glLabelId">
<ItemTemplate>
<asp:Label ID="lblglLabelId" runat="server" Text='<%# Eval("GeneralLookup1.LookupItem") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Caption" SortExpression="glCaptionId">
<ItemTemplate>
<asp:Label ID="lblglCaptionId" runat="server" Text='<%# Eval("GeneralLookup2.LookupItem") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
</Columns>
<EmptyDataTemplate>
<div class="divEmptyListingGrid">
--- No Signature Line Exists ---
</div>
</EmptyDataTemplate>
</asp:GridView>
---不存在签名行---
cs文件的代码:
protected void gdvSignatureLines_Sorting(object sender, GridViewSortEventArgs e)
{
lblHeading.Text = "Signature Line for " + reportName;
ReportOptionsBO reportOptionsBO = new ReportOptionsBO();
List<ReportSignatureLine> listSignature = reportOptionsBO.GetReportSignatureLineByReportId(reportId);
if (listSignature != null)
{
var param = Expression.Parameter(typeof(ReportSignatureLine), e.SortExpression);
var sortExpression = Expression.Lambda<Func<ReportSignatureLine, object>>
(Expression.Convert(Expression.Property(param, e.SortExpression), typeof(object)), param);
if (e.SortDirection == SortDirection.Ascending)
{
gdvSignatureLines.DataSource = listSignature.AsQueryable<ReportSignatureLine>().OrderBy(sortExpression).ToList();
}
else
{
gdvSignatureLines.DataSource = listSignature.AsQueryable<ReportSignatureLine>().OrderByDescending(sortExpression).ToList();
}
gdvSignatureLines.DataBind();
}
}
受保护的无效gdvSignatureLines\u排序(对象发送器,GridViewSortEventArgs e)
{
lblHeading.Text=“签名行代表”+报告名;
ReportOptionsBO ReportOptionsBO=新的ReportOptionsBO();
List listSignature=reportOptionsBO.GetReportSignatureLineByReportId(reportId);
if(listSignature!=null)
{
var param=Expression.Parameter(typeof(ReportSignatureLine),e.SortExpression);
var sortExpression=Expression.Lambda
(Expression.Convert(Expression.Property(param,e.SortExpression),typeof(object)),param);
if(e.SortDirection==SortDirection.Ascending)
{
gdvSignatureLines.DataSource=listSignature.AsQueryable().OrderBy(sortExpression.ToList();
}
其他的
{
gdvSignatureLines.DataSource=listSignature.AsQueryable().OrderByDescending(sortExpression.ToList();
}
gdvSignatureLines.DataBind();
}
}
由于它没有数据源,这可能有助于:
由于您要在代码隐藏中设置数据源,因此您必须编写一些代码才能进行排序 首先,将排序事件添加到GridView标记中
<asp:GridView ID="gdvSignatureLines" runat="server" CssClass="Grid1" AutoGenerateColumns="False" SkinID="PagedGridView" AllowPaging="True" AllowSorting="True" DataKeyNames="Id"
onrowcommand="gdvSignatureLines_RowCommand"
onrowdeleting="gdvSignatureLines_RowDeleting"
onrowediting="gdvSignatureLines_RowEditing"
OnSorting="gdvSignatureLines_Sorting"
>
在代码隐藏中,绑定排序事件。下面的代码使用LINQ对数据进行排序,并重新绑定GridView
using System.Linq.Expressions;
int reportID = 123456;
protected void gdvSignatureLines_Sorting(object sender, GridViewSortEventArgs e)
{
ReportOptionsBO reportOptionsBO = new ReportOptionsBO();
List<T> ReportOptionsBOList = reportOptionsBO.GetReportSignatureLineByReportId(reportId);
if (ReportOptionsBOList != null)
{
var param = Expression.Parameter(typeof(T), e.SortExpression);
var sortExpression = Expression.Lambda<Func<T, object>>(Expression.Convert(Expression.Property(param, e.SortExpression), typeof(object)), param);
if (ViewState["SortDirection"] == "DESC")
{
ViewState["SortDirection"] = "ASC";
gdvSignatureLines.DataSource = ReportOptionsBOList.AsQueryable<T>().OrderBy(sortExpression);
}
else
{
ViewState["SortDirection"] = "DESC";
gdvSignatureLines.DataSource = ReportOptionsBOList.AsQueryable<T>().OrderByDescending(sortExpression);
}
gdvSignatureLines.DataBind();
}
}
使用System.Linq.Expressions;
int reportID=123456;
受保护的无效gdvSignatureLines\u排序(对象发送器、GridViewSortEventArgs e)
{
ReportOptionsBO ReportOptionsBO=新的ReportOptionsBO();
List ReportOptionsBOList=reportOptionsBO.GetReportSignatureLineByReportId(报告ID);
如果(ReportOptionsBOList!=null)
{
var param=表达式参数(typeof(T),e.SortExpression);
var-sortExpression=Expression.Lambda(Expression.Convert(Expression.Property(param,e.sortExpression),typeof(object)),param);
如果(视图状态[“排序方向”]=“描述”)
{
视图状态[“排序方向”]=“ASC”;
gdvSignatureLines.DataSource=ReportOptionsBOList.AsQueryable().OrderBy(sortExpression);
}
其他的
{
视图状态[“排序方向”]=“描述”;
gdvSignatureLines.DataSource=ReportOptionsBOList.AsQueryable().OrderByDescending(sortExpression);
}
gdvSignatureLines.DataBind();
}
}
由于要在代码隐藏中绑定数据源,因此排序表达式不会以声明方式更新。您需要在代码隐藏中处理不断变化的排序表达式
以下是您如何做到这一点:
using System.Linq.Expressions;
int reportID = 123456;
protected void gdvSignatureLines_Sorting(object sender, GridViewSortEventArgs e)
{
ReportOptionsBO reportOptionsBO = new ReportOptionsBO();
List<T> ReportOptionsBOList = reportOptionsBO.GetReportSignatureLineByReportId(reportId);
if (ReportOptionsBOList != null)
{
var param = Expression.Parameter(typeof(T), e.SortExpression);
var sortExpression = Expression.Lambda<Func<T, object>>(Expression.Convert(Expression.Property(param, e.SortExpression), typeof(object)), param);
if (ViewState["SortDirection"] == "DESC")
{
ViewState["SortDirection"] = "ASC";
gdvSignatureLines.DataSource = ReportOptionsBOList.AsQueryable<T>().OrderBy(sortExpression);
}
else
{
ViewState["SortDirection"] = "DESC";
gdvSignatureLines.DataSource = ReportOptionsBOList.AsQueryable<T>().OrderByDescending(sortExpression);
}
gdvSignatureLines.DataBind();
}
}
使用System.Linq.Expressions;
int reportID=123456;
受保护的无效gdvSignatureLines\u排序(对象发送器、GridViewSortEventArgs e)
{
ReportOptionsBO ReportOptionsBO=新的ReportOptionsBO();
List ReportOptionsBOList=reportOptionsBO.GetReportSignatureLineByReportId(报告ID);
如果(ReportOptionsBOList!=null)
{
var param=表达式参数(typeof(T),e.SortExpression);
var-sortExpression=Expression.Lambda(Expression.Convert(Expression.Property(param,e.sortExpression),typeof(object)),param);
如果(视图状态[“排序方向”]=“描述”)
{
视图状态[“排序方向”]=“ASC”;
gdvSignatureLines.DataSource=ReportOptionsBOList.AsQueryable().OrderBy(sortExpression);
}
其他的
{
视图状态[“排序方向”]=“描述”;
gdvSignatureLines.DataSource=ReportOptionsBOList.AsQueryable().OrderByDescending(sortExpression);
}
gdvSignatureLines.DataBind();
}
}
为什么不想处理事件排序?因为我不知道如何处理这些事件,因为我使用的是列表,而不是数据表。请看代码。this.gdvSignatureLines.DataSource=reportOptionsBO.GetReportSignatureLineByReportId(reportId);这是.gdvSignatureLines.DataBind();对于gridview和排序您用于绑定gridview的数据结构类型来说,这并不重要。排序代码将与列表一起使用。我会用你可以在项目中使用的确切代码更新我的答案。我不明白为什么该博客的链接是相关的。如果你有我的问题的解决方案,请一定让我知道!我不能使用这个,因为他使用的是Datatable,而我不是。原理是一样的,你在后面绑定代码,所以你应该处理排序事件。谢谢Alison,我很快会使用这个代码,然后我会让你知道。再次感谢!出现了一个异常:数据源不支持服务器端数据分页。嘿,Alison,现在唯一的问题是,排序只是第一次执行。下次不会了。您能再次提供帮助吗?如果您在代码中添加断点,您能点击它们吗?是的,我发现的问题是,sortexpression总是包含升序。因此,似乎第一次是排序,而不是下一次。事实上,它总是按升序排序。