我遇到了问题。
我正在关注此demo以在RadGrid上显示编辑表单。但是，当我点击“编辑”按钮时，我无法显示“编辑表单”。
这是我正在使用的代码：
<telerik:RadGrid ID="radGridTarget" GridLines="None" runat="server" AllowAutomaticDeletes="True"
AllowAutomaticInserts="True" PageSize="10" Width="500px"
OnItemDeleted="radGridTarget_ItemDeleted" OnItemInserted="radGridTarget_ItemInserted"
OnItemUpdated="radGridTarget_ItemUpdated" AllowAutomaticUpdates="True" AllowPaging="True"
AutoGenerateColumns="False"
onneeddatasource="radGridTarget_NeedDataSource"
onitemcommand="radGridTarget_ItemCommand" >
<MasterTableView CommandItemDisplay="Top" HorizontalAlign="NotSet" AutoGenerateColumns="False">
<NoRecordsTemplate>
<table width="100%" border="0" cellpadding="20" cellspacing="20">
<tr>
<td align="center">
<h2 style="color:Black">No Data Found.</h2>
</td>
</tr>
</table>
</NoRecordsTemplate>
<PagerStyle Mode="NumericPages"/>
<Columns>
<telerik:GridEditCommandColumn HeaderStyle-Width="10%"></telerik:GridEditCommandColumn>
<telerik:GridBoundColumn DataField="Sales" HeaderText="NIK Sales" Display="false"></telerik:GridBoundColumn>
<telerik:GridBoundColumn HeaderText="Target" DefaultInsertValue="Target" HeaderStyle-Width="20%" UniqueName="Target" DataField="Target">
</telerik:GridBoundColumn>
<telerik:GridBoundColumn DataField="Amount" HeaderStyle-Width="20%" HeaderText="Target Amount" SortExpression="Amount" UniqueName="Amount">
</telerik:GridBoundColumn>
<telerik:GridBoundColumn DataField="Campaign" HeaderText="Campaign" UniqueName="Campaign" HeaderStyle-Width="20%"></telerik:GridBoundColumn>
<telerik:GridBoundColumn DataField="StartDate" HeaderText="StartDate" UniqueName="StartDate" HeaderStyle-Width="10%"></telerik:GridBoundColumn>
<telerik:GridBoundColumn DataField="EndDate" HeaderText="EndDate" UniqueName="EndDate" HeaderStyle-Width="10%"></telerik:GridBoundColumn>
<telerik:GridButtonColumn ConfirmText="Delete this target?" ConfirmDialogType="RadWindow" ConfirmTitle="Delete" HeaderText="Delete"
HeaderStyle-Width="10%" ButtonType="ImageButton" CommandName="Delete" Text="Delete" UniqueName="DeleteColumn">
</telerik:GridButtonColumn>
</Columns>
<EditFormSettings EditFormType="Template">
<FormTemplate>
<table id="tableFormEdit" cellspacing="2" cellpadding="1" width="100%" border="0" rules="none"
style="border-collapse: collapse;">
<tr class="EditFormHeader">
<td colspan="2">
<b>Target Details</b>
</td>
</tr>
<tr>
<td>
<table id="Table3" width="450px" border="0" class="module">
<tr>
<td>Target:
</td>
<td>
<telerik:RadDropDownList ID="radDropDownTargetList" EmptyMessage="Target" runat="server" SelectedItem='<%# Bind("Target") %>'
DataSource='<%# PopulateTargetList() %>' DataTextField="Desc" DataValueField="Value" Skin="MetroTouch" TabIndex="5" >
</telerik:RadDropDownList>
</td>
</tr>
<tr>
<td>Amount:
</td>
<td>
<telerik:RadNumericTextBox ID="radTextAmount" runat="server" EmptyMessage="Amount" Text='<%# Bind("Amount") %>' TabIndex="6"
Skin="MetroTouch" ShowButton="false" ShowSpinButtons="false">
<NumberFormat GroupSeparator="" DecimalDigits="0" />
</telerik:RadNumericTextBox>
</td>
</tr>
<tr>
<td>Campaign:
</td>
<td>
<telerik:RadDropDownList ID="radDropDownCampaignList" EmptyMessage="Campaign" runat="server" SelectedItem='<%# Bind("Campaign") %>'
DataTextField="Desc" DataValueField="Value" Skin="MetroTouch" TabIndex="7" >
</telerik:RadDropDownList>
</td>
</tr>
<tr>
<td>Start Date:
</td>
<td>
<telerik:RadDatePicker ID="radStartDate" runat="server" Culture="en-US" TabIndex="8" Skin="MetroTouch">
<Calendar ID="Calendar1" runat="server">
<SpecialDays>
<telerik:RadCalendarDay Repeatable="Today" ItemStyle-BackColor="Yellow">
</telerik:RadCalendarDay>
</SpecialDays>
</Calendar>
<DateInput DisplayDateFormat="d/M/yyyy" DateFormat="d/M/yyyy" LabelWidth="40%" TabIndex="6">
</DateInput>
</telerik:RadDatePicker>
</td>
</tr>
<tr>
<td>End Date:
</td>
<td>
<telerik:RadDatePicker ID="radEndDate" runat="server" Culture="en-US" TabIndex="9" Skin="MetroTouch">
<Calendar ID="Calendar2" runat="server">
<SpecialDays>
<telerik:RadCalendarDay Repeatable="Today" ItemStyle-BackColor="Yellow">
</telerik:RadCalendarDay>
</SpecialDays>
</Calendar>
<DateInput DisplayDateFormat="d/M/yyyy" DateFormat="d/M/yyyy" LabelWidth="40%" TabIndex="6">
</DateInput>
</telerik:RadDatePicker>
</td>
</tr>
</table>
</td>
</tr>
<tr>
<td colspan="2"></td>
</tr>
<tr>
<td></td>
<td></td>
</tr>
<tr>
<td align="right" colspan="2">
<asp:Button ID="btnUpdate" Text='<%# (Container is GridEditFormInsertItem) ? "Insert" : "Update" %>'
runat="server" CommandName='<%# (Container is GridEditFormInsertItem) ? "PerformInsert" : "Update" %>' TabIndex="10"></asp:Button>
<asp:Button ID="btnCancel" Text="Cancel" runat="server" CausesValidation="False" TabIndex="11"
CommandName="Cancel"></asp:Button>
</td>
</tr>
</table>
</FormTemplate>
</EditFormSettings>
</MasterTableView>
<ClientSettings AllowKeyboardNavigation="true">
</ClientSettings>
</telerik:RadGrid>
和
protected void radGridTarget_ItemCommand(object sender, GridCommandEventArgs e)
{
if (e.CommandName == RadGrid.InitInsertCommandName) //"Add new" button clicked
{
GridEditCommandColumn editColumn = (GridEditCommandColumn)radGridTarget.MasterTableView.GetColumn("EditCommandColumn");
editColumn.Visible = false;
}
else if (e.CommandName == RadGrid.RebindGridCommandName && e.Item.OwnerTableView.IsItemInserted)
{
e.Canceled = true;
}
else
{
GridEditCommandColumn editColumn = (GridEditCommandColumn)radGridTarget.MasterTableView.GetColumn("EditCommandColumn");
if (!editColumn.Visible)
editColumn.Visible = true;
}
}
哪里出错我？ 工作部分是＆＃34;添加新按钮＆＃34;只要。当我点击编辑命令时，没有什么可以显示的。
更新
我正在尝试使用IE进行调试，我得到了一些东西。 当我点击编辑时，它会显示：
Sys.WebForms.PageRequestManagerServerErrorException：指定的强制转换是 无效。
问题： 1.为什么会发生错误？
请帮帮我。提前谢谢