GridView 不允许找到任何控件
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【中文标题】GridView 不允许找到任何控件【英文标题】：GridView is not allowing to find any control 【发布时间】：2013-11-20 04:46:03 【问题描述】：我想使用嵌套的gridview。但是我的父网格在 ChildGrid 的变量中显示Nothing。
有什么帮助吗？我尝试了以下方法：
1)
将 gvChild 调暗为 GridView = CType(Me.gvwSubjectForProject.FindControl("gvChildGrid"), GridView)
2)
将 gvChild 调暗为 GridView = Me.gvwSubjectForProject.FindControl("gvChildGrid") gvChild.DataSource = dt_Subject gvChild.DataBind()
我想找到子网格的id，然后想给它分配数据源。
VB
Private Function FillGrid(ByVal mode As String, ByVal dt_Subject As 数据表）作为布尔值 '将 dt_Subject 作为 DataTable = 无 'Dim dt_sortsubject As DataTable = 无 试试
If (mode = "ParentGrid") Then Me.gvwSubjectForProject.DataSource = Nothing Me.gvwSubjectForProject.DataBind() 'Me.ViewState(VS_CurrentSubject) = Nothing Me.btnExport.Visible = False 'dt_Subject.Columns.Add("Status", GetType(String)) If Not dt_Subject Is Nothing Then If dt_Subject.Rows.Count > 0 Then If dt_Subject.Rows.Count > 0 Then For Each dr_Row In dt_Subject.Rows If dr_Row("cStatus") = "AC" Then dr_Row("Status") = "Active" ElseIf dr_Row("cStatus") = "IA" Then dr_Row("Status") = "In Active" ElseIf dr_Row("cStatus") = "HO" Then dr_Row("Status") = "Hold" ElseIf dr_Row("cStatus") = "SC" Then dr_Row("Status") = "Screened" ElseIf dr_Row("cStatus") = "BO" Then dr_Row("Status") = "Booked" ElseIf dr_Row("cStatus") = "OS" Then dr_Row("Status") = "On Study" ElseIf dr_Row("cStatus") = "FI" Then dr_Row("Status") = "Forever Ineligible" Else dr_Row("cStatus") = "Not Found" End If Next Me.btnExport.Visible = True 'Me.ViewState(VS_CurrentSubject) = dt_Subject Me.gvwSubjectForProject.DataSource = dt_Subject Me.gvwSubjectForProject.DataBind() End If End If End If ElseIf (mode = "ChildGrid") Then If Not dt_Subject Is Nothing Then If dt_Subject.Rows.Count > 0 Then 'Me.gvwSubjectForProject.DataSource = dt_Subject 'Me.gvwSubjectForProject.DataBind() 'Me.gvwSubjectForProject.FindControl("gvChildGrid").DataSource =dt_Subject
'CType(Me.gvwSubjectForProject.FindControl("gvChildGrid"),GridView).DataBind() '我.gvwSubjectForProject.FindControl("gvChildGrid")。 'Me.gvwSubjectForProject.FindControl("gvChildGrid").DataBind()
Dim gvChild As GridView = Me.gvwSubjectForProject.FindControl("gvChildGrid") gvChild.DataSource = dt_Subject gvChild.DataBind() End If End If End If Return True Catch ex As Exception Me.ShowErrorMessage("Error While Binding Grid", "....FillGrid") Return False End Try End Function
html 嵌套网格视图
<asp:Panel ID="pnlgvwSubjectStatus" runat="server" Style="max-height: 500px; overflow: auto;
width: 60%;">
<asp:GridView ID="gvwSubjectForProject" runat="server" AutoGenerateColumns="false"
SkinID="grdViewSmlAutoSize" Width="70%" ShowFooter="true" AllowPaging="true"
PageSize="1">
<Columns>
<asp:TemplateField>
<ItemTemplate>
<asp:ImageButton ID="imgbtnExpand" runat="server" ImageUrl="../images/Plus.gif"
OnClientClick="imgbtnExpand_Click" />
<asp:HiddenField ID="hcStatus" runat="server" Value='<%# Eval("cStatus") %>' />
</ItemTemplate>
</asp:TemplateField>
<asp:BoundField DataField="Status" HeaderText="STATUS">
<ItemStyle HorizontalAlign="Left" VerticalAlign="Middle" Wrap="true" Width="40%" />
<HeaderStyle HorizontalAlign="Center" VerticalAlign="Middle" Wrap="true" Width="40%" />
</asp:BoundField>
<asp:TemplateField>
<ItemTemplate>
<div style="max-height: 300px; width: 100%; overflow: auto;
text-align: right;">
<%--<asp:Panel ID="pnlOrders" runat="server" Width="100%">--%>
<asp:GridView ID="gvChildGrid" runat="server" AutoGenerateColumns="false" SkinID="grdViewSmlAutoSize">
<Columns>
<asp:BoundField ItemStyle-Width="40%" DataField="vSubjectID" HeaderText="SUBJECT ID">
<ItemStyle HorizontalAlign="Left" VerticalAlign="Middle" Wrap="true" Width="40%" />
<HeaderStyle HorizontalAlign="Center" VerticalAlign="Middle" Wrap="true" Width="40%" />
</asp:BoundField>
<asp:BoundField ItemStyle-Width="60%" DataField="FullName" HeaderText="FULL NAME">
<ItemStyle HorizontalAlign="Left" VerticalAlign="Middle" Wrap="true" Width="60%" />
<HeaderStyle HorizontalAlign="Center" VerticalAlign="Middle" Wrap="true" Width="60%" />
</asp:BoundField>
</Columns>
</asp:GridView>
<%--</asp:Panel>--%>
</div>
</ItemTemplate>
</asp:TemplateField>
<asp:BoundField DataField="TotalSubject" HeaderText="TOTAL SUBJECTS">
<ItemStyle HorizontalAlign="Left" VerticalAlign="Middle" Wrap="true" Width="50%" />
<HeaderStyle HorizontalAlign="Center" VerticalAlign="Middle" Wrap="true" Width="50%" />
</asp:BoundField>
</Columns>
</asp:GridView>
</asp:Panel>
还有一件事，在 HTML 中，当子 gridview 不显示时，它仍然在创建它的 DOM 时填充。我也想删除那个空白。
【问题讨论】：
请发布您正在执行这些尝试的FindControl() 调用的事件方法的所有代码。另外，能否请您发布嵌套网格视图控件的标记？
请检查更新的代码。
【参考方案1】：
您发布的代码不起作用，因为您在整个父网格视图控件上使用FindControl() 方法，而不是在网格视图控件中的单个行上，如下所示：
在OnRowDataBound 事件中查找子网格视图：
Sub ParentGridView_RowDataBound(ByVal sender As Object, ByVal e As GridViewRowEventArgs)
' Only look for child grid view in data rows, ignore header and footer rows
If e.Row.RowType = DataControlRowType.DataRow Then
Dim theChildGridView As GridView = DirectCast(e.Row.FindControl("gvChildGrid"), GridView)
' Do something with theChildGridView here
End If
End Sub
通过遍历父网格视图控件中的所有行来查找子网格视图：
For Each row As GridViewRow In ParentGridView.Rows
' Only look for child grid view in data rows, ignore header and footer rows
If row.RowType = DataControlRowType.DataRow Then
Dim theChildGridView As GridView = DirectCast(row.FindControl("gvChildGrid"), GridView)
' Do something with theChildGridView here
End If
Next
【讨论】：
但至少应该有任何方法可以控制 Parent_gridview 中的 Child_gridview ...即使在调试时也找不到 imgbtnExpand。 好的。我会尝试这种方式，但与此同时，您能帮我解决我在问题最后一句中提到的其他问题吗？ 问题似乎在以上是关于GridView 不允许找到任何控件的主要内容，如果未能解决你的问题，请参考以下文章
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