我想在删除之前做确认消息，但我有错误
无法转换类型为＃System; Web.UI.LiteralControl＆＃39;的对象输入 ＆＃39; System.Web.UI.WebControls.LinkButton＆＃39;
我不知道问题在哪里以及如何解决，
<script type="text/javascript">
function ConfirmOnDelete(item)
{
if (confirm("Are you sure to delete: " + item + "?")==true)
return true;
else
return false;
}
</script>
<asp:GridView ID="GVAllProjects" runat="server"
OnRowDataBound="GVAllProjects_RowDataBound"
OnRowDeleting="GVAllProjects_RowDeleting"
OnRowEditing="GVAllProjects_RowEditing"
OnRowUpdating="GVAllProjects_RowUpdating"
OnRowCancelingEdit="GVAllProjects_RowCancelingEdit"
OnPageIndexChanging="GVAllProjects_PageIndexChanging"
PagerSettings-Mode="NumericFirstLast"
AutoGenerateColumns="False" AllowPaging="True" PageSize="3" DataKeyNames="ID"
CssClass="grid">
<EditRowStyle CssClass="GridViewEditRow" />
<Columns>
<asp:CommandField ButtonType="Image" UpdateText="تحديث" CancelImageUrl="~/images/close-btn.png" CancelText="الغاء" DeleteImageUrl="images/delete.png" DeleteText="حذف" EditText="تعديل" ShowEditButton="true" ShowDeleteButton="true" ItemStyle-Width="150" />
<asp:TemplateField Visible="false">
<ItemTemplate>
<asp:Label ID="lblProID" Visible="false" runat="server" Text='<%# Eval("ID")%>' />
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="المشروعات" ItemStyle-Width="150">
<ItemTemplate>
<asp:Label ID="lblProjectName" runat="server" Text='<%# Eval("ProjectName")%>'></asp:Label>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox ID="txtProjectName" runat="server" Text='<%# Eval("ProjectName") %>'></asp:TextBox>
</EditItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="الغرض" ItemStyle-Width="150">
<ItemTemplate>
<asp:Label ID="lblPurposeName" runat="server" Text='<%# Bind("Purpose.PurposeName")%>'></asp:Label>
</ItemTemplate>
<EditItemTemplate>
<asp:DropDownList ID="ddlPurposeName" runat="server">
</asp:DropDownList>
<asp:RequiredFieldValidator ID="valPurposeName" runat="server" ControlToValidate="ddlPurposeName"
Display="Dynamic" ErrorMessage="PurposeName is required." ForeColor="Red" SetFocusOnError="True"
ValidationGroup="editGrp">*</asp:RequiredFieldValidator>
</EditItemTemplate>
<FooterTemplate>
<asp:DropDownList ID="ddlPurposeNameNew" runat="server">
</asp:DropDownList>
<asp:RequiredFieldValidator ID="valClassificationNew" runat="server" ControlToValidate="ddlPurposeNameNew"
Display="Dynamic" ErrorMessage="DistrictName is required." ForeColor="Red" SetFocusOnError="True"
ValidationGroup="newGrp">*</asp:RequiredFieldValidator>
</FooterTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="الموقع" ItemStyle-Width="150">
<ItemTemplate>
<asp:Label ID="lblDistrictName" runat="server" Text='<%# Eval("District.DistrictName") %>'></asp:Label>
</ItemTemplate>
<EditItemTemplate>
<asp:DropDownList ID="ddlDistrictName" runat="server">
</asp:DropDownList>
<asp:RequiredFieldValidator ID="valDistrictName" runat="server" ControlToValidate="ddlDistrictName"
Display="Dynamic" ErrorMessage="DistrictName is required." ForeColor="Red" SetFocusOnError="True"
ValidationGroup="editGrp">*</asp:RequiredFieldValidator>
</EditItemTemplate>
<FooterTemplate>
<asp:DropDownList ID="ddlDistrictNameNew" runat="server">
</asp:DropDownList>
<asp:RequiredFieldValidator ID="valDistrictNameNew" runat="server" ControlToValidate="ddlDistrictNameNew"
Display="Dynamic" ErrorMessage="DistrictName is required." ForeColor="Red" SetFocusOnError="True"
ValidationGroup="newGrp">*</asp:RequiredFieldValidator>
</FooterTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="النوع" ItemStyle-Width="150">
<ItemTemplate>
<asp:Label ID="lblTypes" runat="server" Text='<%# Bind("Type.TypeName")%>'></asp:Label>
</ItemTemplate>
<EditItemTemplate>
<asp:DropDownList ID="ddlTypes" runat="server">
</asp:DropDownList>
<asp:RequiredFieldValidator ID="valTypes" runat="server" ControlToValidate="ddlTypes"
Display="Dynamic" ErrorMessage="Types is required." ForeColor="Red" SetFocusOnError="True"
ValidationGroup="editGrp">*</asp:RequiredFieldValidator>
</EditItemTemplate>
<FooterTemplate>
<asp:DropDownList ID="ddlTypesNew" runat="server">
</asp:DropDownList>
<asp:RequiredFieldValidator ID="valTypesNew" runat="server" ControlToValidate="ddlTypesNew"
Display="Dynamic" ErrorMessage="Types is required." ForeColor="Red" SetFocusOnError="True"
ValidationGroup="newGrp">*</asp:RequiredFieldValidator>
</FooterTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="المساحات" ItemStyle-Width="150">
<ItemTemplate>
<asp:Label ID="lblAreas" runat="server" Text='<%# Eval("Areas")%>'></asp:Label>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox ID="txtAreas" runat="server" Text='<%# Eval("Areas") %>'></asp:TextBox>
</EditItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="نظام السداد" ItemStyle-Width="150">
<ItemTemplate>
<asp:Label ID="lblPaymentSystem" runat="server" Text='<%# Eval("PaymentSystem")%>'></asp:Label>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox ID="txtPaymentSystem" runat="server" Text='<%# Eval("PaymentSystem") %>'></asp:TextBox>
</EditItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="تاريخ الاستلام" ItemStyle-Width="150">
<ItemTemplate>
<asp:Label ID="lblReceivedDate" runat="server" Text='<%# Eval("ReceivedDate", "{0:d}")%>'></asp:Label>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox ID="txtEditDate" Text='<%# Eval("ReceivedDate", "{0:d}")%>' runat="server"></asp:TextBox>
<asp:ImageButton runat="server" ID="imgPopup" ImageUrl="~/images/-calendar.png" ImageAlign="Bottom" />
<ajaxToolkit:CalendarExtender PopupButtonID="imgPopup" ID="CalendarExtender1" runat="server" TargetControlID="txtEditDate"
Format="MM/dd/yyyy" Enabled="true" />
</EditItemTemplate>
<FooterTemplate>
<asp:TextBox ID="txtAddDate" runat="server"></asp:TextBox>
<asp:ImageButton runat="server" ID="imgPopup" ImageUrl="~/images/-calendar.png" ImageAlign="Bottom" />
<ajaxToolkit:CalendarExtender ID="CalendarExtender2" runat="server" PopupPosition="BottomRight"
TargetControlID="txtAddDate" PopupButtonID="imgPopup" Enabled="true" Format="dd/MM/yyyy" />
</FooterTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="تصنيف العقار" ItemStyle-Width="150">
<ItemTemplate>
<asp:Label ID="lblClassification" runat="server" Text='<%# Eval("PropertyClassification")%>'></asp:Label>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox ID="txtClassification" runat="server" Text='<%# Eval("PropertyClassification") %>'></asp:TextBox>
</EditItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="صورة المشروع" ItemStyle-Width="150">
<ItemTemplate>
<img src='ProjectsImages/<%# Eval("ProjectImage") %>' style="width: 135px; height: 85px;" />
</ItemTemplate>
<EditItemTemplate>
<asp:FileUpload ID="UploadPhoto" runat="server" />
</EditItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
背后的代码
if (e.Row.RowType == DataControlRowType.DataRow)
{
string id = e.Row.Cells[0].Text; // Get the id to be deleted
//cast the ShowDeleteButton link to linkbutton
LinkButton lb = (LinkButton)e.Row.Cells[9].Controls[2];
if (lb != null)
{
//attach the JavaScript function with the ID as the paramter
lb.Attributes.Add("onclick", "return ConfirmOnDelete('" + id + "');");
}
ddlDistrictName = e.Row.FindControl("ddlDistrictName") as DropDownList;
ddlPurposeName = e.Row.FindControl("ddlPurposeName") as DropDownList;
ddlTypes = e.Row.FindControl("ddlTypes") as DropDownList;
}
感谢任何帮助。
答案 0 :(得分：0)
开始使用控件按钮的项目模板，您将有更多选择。
<asp:TemplateField ShowHeader="False">
<ItemTemplate>
<asp:ImageButton ID="DeleteItem" runat="server" ImageUrl="~/delete.png" CommandName="Delete" OnClientClick="return confirm('Are you sure you want to delete this item?');" AlternateText="Delete" />
</ItemTemplate>
</asp:TemplateField>
请注意使用CommandName，在本例中为Delete。您还可以使用Edit，Update和Cancel。基本上与CommandField