asp.net - 在页面加载时看不到 asp.net gridview

Question

我有一个不会在页面加载时显示的网格视图。网格视图位于更新面板内的一些 asp:Panels 内。我单步执行了代码，所以我知道 gridview 有数据行。如果我将 gridview 移到面板之外并更新面板，那么它将显示数据。有谁知道为什么它在下面，面板和更新面板内部不起作用？

    <%@ Page Language="VB" AutoEventWireup="false" EnableEventValidation="false" MasterPageFile="~/CTPublic.master" CodeFile="Tank.aspx.vb" Inherits="CargoTank_Internal_Tank" %>

<div style="padding-top:9px; width:100%; min-width:800px; " >
    <asp:UpdatePanel ID="udpTank" runat="server" >
    <ContentTemplate>
                <ajaxToolkit:RoundedCornersExtender runat="server" BorderColor="#3260a0"   Corners="All" Radius="5" Color="#98B9C9"  TargetControlID="pnlTank" ID="ajRCEpnlTank" ></ajaxToolkit:RoundedCornersExtender>

         <asp:Panel runat="server" BackColor="#ecece7"  Width="95%"  ID="pnlTank" >

             <div >
            <div style="float:left; width:70%; background-color:#98B9C9; height:19px;">Tanks</div>
            <div style="float:right; width:30%; height:19px;background-color:#98B9C9; text-align:right">
                <asp:Button ID="btnAddNewTank" style="background:transparent; border:0px;" runat="server" Font-Underline="true"   size="1" Font-Bold=true text="Add New" /> 

             </div> 
            <div style="padding-top:19px;"></div>
            </div>   
            <div style="width:100%;">
                <table width="100%">
                    <tr>
                        <td colspan="6" class="tdheaderbar">Search Tanks
                        </td>
                    </tr>
                    <tr>
                        <td>CT #</td>
                        <td><asp:TextBox runat="server" ID="txtCTNumber" ></asp:TextBox></td>
                        <td>Serial #</td>
                        <td><asp:TextBox runat="server" ID="txtSerialNumber" MaxLength="17"></asp:TextBox></td>
                        <td>City</td>
                        <td><asp:TextBox runat="server" ID="txtCity"></asp:TextBox></td>

                    </tr>
                    <tr>
                         <td>Capacity</td>
                        <td><asp:TextBox runat="server" ID="txtCapacity"></asp:TextBox></td>
                       <td>Unit #</td>
                        <td><asp:TextBox runat="server" ID="txtUnitNumber"></asp:TextBox></td>
                        <td>License State</td>
                        <td><asp:DropDownList EnableViewState="true" runat="server" ID="ddlState" DataSourceID="linqStates" 
                               Width="156px" DataTextField="StateText" DataValueField="StateID"></asp:DropDownList>
                            <asp:LinqDataSource ID="linqStates" runat="server" 
                                ContextTypeName="DataClassesDataContext" TableName="States">
                            </asp:LinqDataSource>
                        </td>

                  </tr>
                     <tr>
                         <td>Tank Type</td>
                        <td>
                            <asp:DropDownList runat="server" ID="ddlTankType"  Width="156px"
                                 ></asp:DropDownList>

                        </td> 
                        <td>Compartment</td>
                        <td><asp:TextBox runat="server" ID="txtCompartment"></asp:TextBox></td>
                         <td>License #</td>
                        <td><asp:TextBox runat="server" ID="txtLicenseNumber"></asp:TextBox></td>
                  </tr>
                      <tr>
                         <td>Manufacturer</td>
                        <td colspan="2">
                            <asp:DropDownList runat="server" ID="ddlManufacturer"  
                                 ></asp:DropDownList>

                        </td> 


                       <td><asp:CheckBox runat="server" ID="chkNoLogIn" Text="No Log In Associated" /></td>
                       <td></td> <td></td> 
                   </tr>
                   <tr><td>Company</td>
                        <td colspan="5"> <asp:DropDownList runat="server" ID="ddlCompany" ></asp:DropDownList></td>    
                 </tr>  
                 <tr>
                    <td colspan="3">
                    </td>
                    <td><asp:Button runat="server" ID="btnSearch" Text="Search" /></td>
                  </tr>
                </table>
            </div>

        </asp:Panel>
   </ContentTemplate>
    <Triggers>
    <asp:AsyncPostBackTrigger ControlID="btnSearch" EventName="Click" />
    </Triggers>  
  </asp:UpdatePanel>
  <br />

      <div style="padding-top:9px; width:100%; " id="divTankDetail" runat="server">
    <asp:UpdatePanel ID="updTankDetail" runat="server"  >
    <ContentTemplate>
        <ajaxToolkit:DropShadowExtender runat="server" ID="dsetank" TargetControlID="pnlTankDetail" TrackPosition="true" BehaviorID="pnlTankDetailHeader"></ajaxToolkit:DropShadowExtender>
        <ajaxToolkit:DragPanelExtender runat="server" ID="dpeTankDetail" TargetControlID="pnlTankDetail" DragHandleID="pnlTankDetailHeader"></ajaxToolkit:DragPanelExtender>
        <asp:Panel CssClass="TankpopupPosition" BackColor="LightBlue" Visible="false" runat="server" BorderColor="#3260a0" BorderWidth="2px"  Width="801px"  ID="pnlTankDetail" >
               <asp:Panel runat="server" BorderColor="#3260a0" BorderWidth="1px"  Width="800px"  ID="pnlTankDetailHeader">
             <div  >
            <div style="float:left; width:90%; background-color:#98B9C9; height:19px;">Tank Detail</div>
            <div style="float:right; width:10%; border-right-width:2px; border-width:1px; border-color:#3260a0; height:19px;background-color:#98B9C9; text-align:right">
                <asp:Button ID="btnClose" style="background:transparent; border:0px;" runat="server"   size="1" Font-Bold=true text="X" />&nbsp;
            </div> 

            <div style="padding-top:19px;"></div>
            </div>  
            </asp:Panel>
               <asp:Panel  runat="server"  Width="800px"  ID="pnlTankDetailBody">
                <div id="divTankDetailbody" runat="server" style="width:100%"  >
                 <br />
                 <table width="100%">
                    <tr>
                        <td>CT #</td>
                        <td><asp:TextBox TabIndex="10" runat="server" BorderStyle="Inset" BorderColor="White" BorderWidth="2px" BackColor="Transparent" ID="txtCTNum" ReadOnly="true" ></asp:TextBox>
                        <asp:Label ID="lblCTNumber" runat="server" Text="*"></asp:Label>&nbsp</td>
                        <td>Serial #</td>
                        <td><asp:TextBox TabIndex="14" runat="server" BorderStyle="Inset" BorderColor="White" BorderWidth="2px" ID="txtSeriaNum" MaxLength="17"></asp:TextBox>
                        <asp:Label ID="lblSerialNumber" runat="server" Text="*"></asp:Label>&nbsp</td>
                        <td>City</td>
                        <td><asp:TextBox runat="server" TabIndex="18" BorderStyle="Inset" BorderColor="White" BorderWidth="2px" ID="txtOrignatedCity"></asp:TextBox></td>
                    </tr>
                    <tr>
                        <td>Capacity</td>
                        <td><asp:TextBox TabIndex="11" runat="server" BorderStyle="Inset" BorderColor="White" BorderWidth="2px" ID="txtTanktCapacity"></asp:TextBox>
                        <asp:Label ID="lblCapacity" runat="server" Text="*"></asp:Label>&nbsp</td>
                         <td>Compartment</td>
                        <td><asp:TextBox runat="server" TabIndex="15" ID="txtCompartment2" BorderStyle="Inset" BorderColor="White" BorderWidth="2px"></asp:TextBox>
                      <asp:Label ID="lblCompartment" runat="server" Text="*"></asp:Label>&nbsp</td>

                                                    <td>License #</td>
                        <td><asp:TextBox runat="server" BorderStyle="Inset" TabIndex="19" BorderColor="White" BorderWidth="2px" ID="txtLicenseNum"></asp:TextBox></td>
                  </tr>
                     <tr>
                                                  <td>Tank Type</td>
                        <td>
                            <asp:DropDownList runat="server" TabIndex="12" ID="ddlTankType2" Width="156px" 
                                 DataTextField="TankTypeName" 
                                DataValueField="TankTypeName"></asp:DropDownList><asp:Label ID="lblTankType" runat="server" Text="*"></asp:Label>&nbsp
                         </td> 
                        <td>Unit #</td>
                        <td><asp:TextBox runat="server" TabIndex="16" BorderStyle="Inset" BorderColor="White" BorderWidth="2px" ID="txtUnitNum"></asp:TextBox></td>

                        <td>License State</td>
                        <td> 
                            <asp:DropDownList EnableViewState="true" Width="156px" TabIndex="20"  runat="server" ID="ddlLicenseState" DataSourceID="linqStates" 
                                DataTextField="StateText" DataValueField="StateID"></asp:DropDownList>                                


                            <asp:LinqDataSource ID="LinqDataSource1" runat="server" 
                                ContextTypeName="DataClassesDataContext" TableName="States">
                            </asp:LinqDataSource>
                        </td>

                  </tr>
                  <tr>
                        <td>Manufacturer</td>
                        <td colspan="1">
                            <asp:DropDownList runat="server" TabIndex="13" ID="ddlManufacturer2"  
                               >
                                 </asp:DropDownList><asp:Label ID="lblManufacturer" runat="server" Text="*"></asp:Label>&nbsp
                         </td> 
                        <td>Company</td>
                        <td colspan="3"> <asp:DropDownList runat="server" TabIndex="17" ID="ddlCompany2" ></asp:DropDownList><asp:Label ID="lblCompany2" runat="server" Text="*"></asp:Label></td>      

                   </tr>
                  <tr>
                    <td colspan="6" align="center"><br />
                        <asp:Label ID="lblChangeOwnership" Font-Size="Medium" runat="server"></asp:Label>
                        <br />
                        <asp:CheckBox ID="chkChangeOwnership" runat="server" Text="Changing ownership" ForeColor="Red" Font-Bold="true" />
                    </td>
                  </tr>
                  <tr>
                    <td colspan="6" align="center">
                        <br />
                     <asp:Button runat="server" ID="btnAdd" TabIndex="21" Text="Add" Width="60px" /> 
                     <asp:Button runat="server" ID="btnUpdate" TabIndex="22" Text="Update" Width="60px" /> 
                     <asp:Button runat="server" ID="btnChangeOnwership" TabIndex="23" Text="Change" Width="60px" /> 
                     <asp:Button runat="server" ID="btnCancel" TabIndex="24" Text="Cancel" Width="60px"  />
                     <br /><br />
                        <asp:GridView ID="grdTanks" runat="server" AllowPaging="True" 
                            AutoGenerateColumns="False" BackColor="Transparent" GridLines="None" 
                            PagerSettings-Mode="NumericFirstLast" PageSize="10" 
                            RowStyle-HorizontalAlign="left" Width="100%">
                            <AlternatingRowStyle CssClass="alternateItemStyle" />
                            <HeaderStyle CssClass="headerStyle" />
                            <PagerSettings Mode="NumericFirstLast" />
                            <RowStyle CssClass="itemStyle" />
                            <Columns>
                                <asp:BoundField DataField="CargoTankID" HeaderText="CT #" InsertVisible="False" 
                                    ReadOnly="True" SortExpression="CargoTankID" />
                                <asp:BoundField DataField="CompanyID" HeaderText="CompanyID" 
                                    SortExpression="CompanyID" Visible="false" />
                                <asp:BoundField DataField="OriginatedCity" HeaderText="OriginatedCity" 
                                    SortExpression="OriginatedCity" Visible="false" />
                                <asp:BoundField DataField="LicenseNumber" HeaderText="LicenseNumber" 
                                    SortExpression="LicenseNumber" Visible="false" />
                                <asp:BoundField DataField="LicenseState" HeaderText="LicenseState" 
                                    SortExpression="LicenseState" Visible="false" />
                                <asp:BoundField DataField="UnitNumber" HeaderText="Unit Number" 
                                    SortExpression="UnitNumber" Visible="false" />
                                <asp:TemplateField HeaderText="Company">
                                    <ItemTemplate>
                                        <%#DisplayCompanyName(Eval("CompanyID"))%>
                                    </ItemTemplate>
                                </asp:TemplateField>
                                <asp:BoundField DataField="SerialNumber" HeaderText="Serial Number" 
                                    SortExpression="SerialNumber" />
                                <asp:BoundField DataField="Capacity" HeaderText="Capacity" 
                                    SortExpression="Capacity" />
                                <asp:TemplateField HeaderText="Manufacturer">
                                    <ItemTemplate>
                                        <%#DisplayManufacturer(Eval("ManufacturerID"))%>
                                    </ItemTemplate>
                                </asp:TemplateField>
                                <asp:BoundField DataField="TankType" HeaderText="Tank Type" 
                                    SortExpression="TankType" Visible="false" />
                                <asp:BoundField DataField="Compartment" HeaderText="Compartment" 
                                    SortExpression="Compartment" Visible="false" />
                                <asp:BoundField DataField="DecalID" HeaderText="DecalID" 
                                    SortExpression="DecalID" Visible="false" />
                                <asp:TemplateField HeaderText="Decal Status">
                                    <ItemTemplate>
                                        <%#DisplayTestLink(Eval("CargoTankID"))%>
                                    </ItemTemplate>
                                </asp:TemplateField>
                            </Columns>
                        </asp:GridView>
                     </td>

                  </tr>
                </table>

            </div>
            </asp:Panel>
        </asp:Panel>
   </ContentTemplate>
    <Triggers>
            <asp:AsyncPostBackTrigger ControlID="btnSearch" EventName="Click" />

    </Triggers>  
  </asp:UpdatePanel>

这是我背后的代码：

        Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
    If Not Page.IsPostBack Then
        If (Me.Page.User.Identity.IsAuthenticated) Then
            Dim db As DataClassesDataContext = New DataClassesDataContext()

            Dim tanks = From t In db.CT_Tanks _
                        Select t

            Me.grdTanks.DataSource = tanks
            Me.grdTanks.DataBind()

            Dim tanktype = (From t In db.CT_TankTypes _
                            Select t).ToList

            ddlTankType.DataSource = tanktype
            ddlTankType.DataTextField = "TankTypeName"
            ddlTankType.DataValueField = "TankTypeName"
            ddlTankType.DataBind()
            ddlTankType.Items.Insert(0, "-- Select a Type --")
            ddlTankType2.DataSource = tanktype
            ddlTankType2.DataTextField = "TankTypeName"
            ddlTankType2.DataValueField = "TankTypeName"
            ddlTankType2.DataBind()
            ddlTankType2.Items.Insert(0, "-- Select a Type --")

            Dim manufacturer = (From m In db.CT_Manufacturers _
                               Select m).ToList

            ddlManufacturer.DataSource = manufacturer
            ddlManufacturer.DataTextField = "ManufacturerName"
            ddlManufacturer.DataValueField = "ManufacturerID"
            ddlManufacturer.DataBind()
            ddlManufacturer.Items.Insert(0, "-- Select a Manufacturer --")

            ddlManufacturer2.DataSource = manufacturer
            ddlManufacturer2.DataTextField = "ManufacturerName"
            ddlManufacturer2.DataValueField = "ManufacturerID"
            ddlManufacturer2.DataBind()
            ddlManufacturer2.Items.Insert(0, "-- Select a Manufacturer --")

            Dim companies = (From c In db.CT_Companies _
                             Where c.IsOwner = True _
                             Select c Order By c.CompanyName Ascending).ToList

            ddlCompany.DataSource = companies
            ddlCompany.DataTextField = "CompanyName"
            ddlCompany.DataValueField = "CompanyID"
            ddlCompany.DataBind()
            ddlCompany.Items.Insert(0, "-- Select a Company --")

            ddlCompany2.DataSource = companies
            ddlCompany2.DataTextField = "CompanyName"
            ddlCompany2.DataValueField = "CompanyID"
            ddlCompany2.DataBind()
            ddlCompany2.Items.Insert(0, "-- Select a Company --")

        End If
    End If

End Sub

score 0 · Accepted Answer

数据绑定 gridview 后，您的更新面板似乎没有被触发

尝试：

<asp:UpdatePanel ID="updTankDetail" runat="server" UpdateMode="Conditional">

然后在你的代码后面放

updTankDetail.Update()

score 0 · Accepted Answer

我试过这个地方我的gridview在面板下的更新面板和它的作品..

<asp:Panel ID="pnContainer" runat="server">
  <asp:UpdatePanel ID="UpdatePanel1" runat="server">
     <ContentTemplate>
             <asp:GridView ID="gvempgrade" runat="server" AutoGenerateColumns="False" GridLines="None" 
        onselectedindexchanged="GridView1_SelectedIndexChanged" 
        onrowcancelingedit="gvempgrade_RowCancelingEdit" 
        onrowediting="gvempgrade_RowEditing" 
        onrowupdating="gvempgrade_RowUpdating" ShowFooter="True" 
        onrowcommand="gvempgrade_RowCommand" 
        onrowdeleting="gvempgrade_RowDeleting">
        <FooterStyle BackColor="#A86E07" Font-Bold="True" ForeColor="White" />
        <RowStyle BackColor="#F7F6F3" ForeColor="#603813" />
        <Columns>
            <asp:TemplateField HeaderText="<%$ Resources:Resources, SrNo %>" ItemStyle-CssClass="srcenteralg" ItemStyle-Width="30" HeaderStyle-Width="55" >
                <ItemTemplate >
                    <%# Container.DataItemIndex + 1 %>
                </ItemTemplate>
            </asp:TemplateField>
            <asp:TemplateField Visible="false">
                <ItemTemplate>
                    <asp:Label ID="lblid" runat="server" Text='<%# Bind("id_grd") %>'></asp:Label>
                </ItemTemplate>
            </asp:TemplateField>
            <asp:TemplateField HeaderText="<%$ Resources:Resources, Grade %>"  >
                <ItemStyle HorizontalAlign="Center"  />
                <ItemTemplate>
                    <asp:Label ID="lblgrade" runat="server" Text='<%# Bind("grade_grd") %>'></asp:Label>
                </ItemTemplate>
                <EditItemTemplate>
                    <asp:TextBox ID="txtempgrade" Width="55" CssClass="alphabetsOnlynospace" runat="server" Text='<%# Bind("grade_grd") %>'></asp:TextBox>
                </EditItemTemplate>
                <FooterTemplate >
                    <asp:TextBox ID="txtfempgrade" CssClass="alphabetsOnlynospace" runat="server" Width="55"></asp:TextBox>
                </FooterTemplate>
            </asp:TemplateField>
            <asp:TemplateField HeaderText="<%$ Resources:Resources, Description %>" HeaderStyle-HorizontalAlign="Left">
                <ItemTemplate>
                    <asp:Label ID="lbldiscription" runat="server" Text='<%# Bind("description_grd") %>'></asp:Label>
                </ItemTemplate>
                <EditItemTemplate>
                    <asp:TextBox ID="txtempdescription" CssClass="alphabetsOnly" runat="server" Text='<%# Bind("description_grd") %>'></asp:TextBox>
                </EditItemTemplate>
                <FooterTemplate>
                    <asp:TextBox ID="txtfempdescription" CssClass="alphabetsOnly" runat="server"></asp:TextBox>
                </FooterTemplate>

            <HeaderStyle HorizontalAlign="Left"></HeaderStyle>
            </asp:TemplateField>

            <asp:TemplateField HeaderText="<%$ Resources:Resources, Maxctc %>" HeaderStyle-HorizontalAlign="Center">
               <ItemStyle HorizontalAlign="Center" />
                <ItemTemplate>
                    <asp:Label ID="lblmaxctc" runat="server" Text='<%# Bind("max_ctc_grd") %>'></asp:Label>
                </ItemTemplate>
                <EditItemTemplate>
                    <asp:TextBox ID="txtmaxctc" CssClass="numbersOnly" MaxLength="10" Width="100" runat="server" Text='<%# Bind("max_ctc_grd") %>'></asp:TextBox>
                </EditItemTemplate>
                <FooterTemplate>
                    <asp:TextBox ID="txtfmaxctc" CssClass="numbersOnly" MaxLength="10" Width="100" runat="server"></asp:TextBox>
                </FooterTemplate>

            <HeaderStyle HorizontalAlign="Center"></HeaderStyle>
            </asp:TemplateField>
            <asp:TemplateField HeaderText="<%$ Resources:Resources, Minctc %>"  HeaderStyle-HorizontalAlign="Center">
               <ItemStyle HorizontalAlign="Center" />
                <ItemTemplate>
                    <asp:Label ID="lblminctc" runat="server" Text='<%# Bind("min_ctc_grd") %>'></asp:Label>
                </ItemTemplate>
                <EditItemTemplate>
                    <asp:TextBox ID="txtminctc" MaxLength="10" CssClass="numbersOnly"  Width="100" runat="server" Text='<%# Bind("min_ctc_grd") %>'></asp:TextBox>
                </EditItemTemplate>
                <FooterTemplate>
                    <asp:TextBox ID="txtfminctc" MaxLength="10" CssClass="numbersOnly" Width="100" runat="server"></asp:TextBox>
                </FooterTemplate>

            <HeaderStyle HorizontalAlign="Center"></HeaderStyle>
            </asp:TemplateField>
            <asp:TemplateField ShowHeader="False" ItemStyle-Width="190px" FooterStyle-HorizontalAlign="Center" ItemStyle-HorizontalAlign="Center" >
                <ItemTemplate>
                    <asp:Button  ID="btnedit" runat="server" CausesValidation="True" CssClass="btngradiant" 
                        CommandName="Edit" Text="<%$ Resources:Resources, Edit %>"></asp:Button >
                </ItemTemplate>
                <EditItemTemplate>
                    <asp:Button  ID="btnupdate" runat="server" CausesValidation="True" CssClass="btngradiant"
                        CommandName="Update" Text="Update" OnClientClick="return updatevalidation();" ></asp:Button >
                    &nbsp;<asp:Button  ID="btncancel" runat="server" CausesValidation="False" CssClass="btngradiant"
                        CommandName="Cancel" Text="Cancel"></asp:Button >
                </EditItemTemplate>
                <FooterTemplate >

                    <asp:Button ID="btninsert" runat="server" Text="<%$ Resources:Resources, Add %>" CommandName="Add"   CssClass="btngradiant" OnClientClick="return validation();" />
                </FooterTemplate>
            </asp:TemplateField>

                <asp:TemplateField ShowHeader="False">
                    <ItemTemplate>
                        <asp:Button ID="LinkButton2" runat="server" CausesValidation="False" CssClass="btngradiant" OnClientClick='return confirm("Are you sure you want to delete this entry?");'
                            CommandName="Delete" Text="<%$ Resources:Resources, Delete %>"></asp:Button>
                    </ItemTemplate>
            </asp:TemplateField>
            </Columns>
        <PagerStyle BackColor="#A86E07" ForeColor="White" HorizontalAlign="Center" />
        <SelectedRowStyle BackColor="#E2DED6" Font-Bold="True" ForeColor="#333333" />
        <HeaderStyle BackColor="#A86E07" Font-Bold="True" ForeColor="White" />
        <EditRowStyle BackColor="#d9d9d9" />
        <AlternatingRowStyle BackColor="White" ForeColor="#A86E07" />
    </asp:GridView>

    </ContentTemplate>
</asp:UpdatePanel>
</asp:Panel>

代码背后：

On pageLoad()

 if (!Page.IsPostBack)
        {
            DataTable dtfetch = emp.Fetchreord();
            gvempgrade.DataSource = dtfetch;
            gvempgrade.DataBind();
        }

注意：当您收到与extendercontrolbase.cs 缺少 dll 相关的错误时，请尝试评论所有 Extender 控件并查看它是否有效

score 0 · Accepted Answer

标题：在页面加载时看不到 asp.net gridview 我在代码中看到您使用面板，id="ID="pnlTankDetail""并且面板ID="pnlTankDetail"具有属性 Visible="False" so the gridviewgrdTanks can't show in page load. You should change toVisible="true to see gridview. And i think thediv tag not have propertyrunnat="server"`。希望有帮助。

score 0 · Accepted Answer

不确定，但添加它可能会帮助你

<asp:ScriptManager ID="ScriptManager1" runat="server" EnablePartialRendering="true" />

asp.net - 在页面加载时看不到 asp.net gridview

4 回答 4

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