I have a drop down list where I am trying to add attributes to it's items. By using watch in VS2015, I can see that the attributes have been added but they are not being rendered on the page.
The DDL is in a gridview edititemtemplate. I have tried adding the attributes here with not luck. I was having trouble accessing the drop down list in the row. I ended up using a rowediting handler. I also thought the row might not be fully in edit mode so I tried making the row go into edit mode programmatically before my operations.
<asp:GridView ID="gvUserDetails" runat="server" DataSourceID="SqlUserDetails" AutoGenerateColumns="False" DataKeyNames="ID,EmpID" >
<Columns>
<asp:TemplateField HeaderText="Emp ID" SortExpression="EmpID">
<EditItemTemplate>
<asp:Label runat="server" Text='<%# Bind("EmpID") %>' ID="LabelEmpIDUpdate"></asp:Label>
</EditItemTemplate>
<ItemTemplate>
<asp:Label runat="server" Text='<%# Bind("EmpID") %>' ID="LabelEmpID"></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Notification Name" SortExpression="NotificationName">
<EditItemTemplate>
<asp:DropDownList ID="ddNotificationNameUpdt" runat="server" SelectedValue='<%# Bind("NotificationName") %>' DataSourceID="SqlNotificationNames" DataTextField="Name" DataValueField="Name"></asp:DropDownList>
</EditItemTemplate>
<ItemTemplate>
<asp:Label ID="LabelNotificationName" runat="server" Text='<%# Bind("NotificationName") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Filter" SortExpression="Filter">
<EditItemTemplate>
<asp:DropDownList ID="ddNotificationFilterUpdt" runat="server" DataSourceID="SqlNotificationFilters" DataTextField="Filter" DataValueField="Filter" SelectedValue='<%# Bind("Filter") %>'></asp:DropDownList>
</EditItemTemplate>
<ItemTemplate>
<asp:Label ID="LabelNotificationFilter" runat="server" Text='<%# Bind("Filter") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Crew Filter" SortExpression="CrewFilter">
<EditItemTemplate>
<asp:DropDownList ID="ddCrewFilterUpdt" runat="server" SelectedValue='<%# Bind("CrewFilter") %>'>
<asp:ListItem>*</asp:ListItem>
<asp:ListItem>A</asp:ListItem>
<asp:ListItem>B</asp:ListItem>
<asp:ListItem>C</asp:ListItem>
<asp:ListItem>D</asp:ListItem>
</asp:DropDownList>
</EditItemTemplate>
<ItemTemplate>
<asp:Label ID="LabelCrewFilter" runat="server" Text='<%# Bind("CrewFilter") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Date Begin" SortExpression="DateBgn">
<EditItemTemplate>
<asp:TextBox ID="TextBoxBgnUpdt" runat="server" Text='<%# Bind("DateBgn") %>' autocomplete="off" ></asp:TextBox>
<ajaxToolkit:CalendarExtender runat="server" BehaviorID="TextBoxBgnUpdt_CalendarExtender" TargetControlID="TextBoxBgnUpdt" ID="TextBoxBgnUpdt_CalendarExtender" PopupButtonID="TextBoxBgnUpdt"></ajaxToolkit:CalendarExtender>
</EditItemTemplate>
<ItemTemplate>
<asp:Label ID="LabelDateBgn" runat="server" Text='<%# Bind("DateBgn") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Date End" SortExpression="DateEnd">
<EditItemTemplate>
<asp:TextBox ID="TextBoxEndUpdt" runat="server" Text='<%# Bind("DateEnd") %>' autocomplete="off" ></asp:TextBox>
<ajaxToolkit:CalendarExtender runat="server" BehaviorID="TextBoxEndUpdt_CalendarExtender" TargetControlID="TextBoxEndUpdt" ID="TextBoxEndUpdt_CalendarExtender"></ajaxToolkit:CalendarExtender>
</EditItemTemplate>
<ItemTemplate>
<asp:Label ID="LabelDateEnd" runat="server" Text='<%# Bind("DateEnd") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField ShowHeader="False">
<EditItemTemplate>
<asp:Button ID="ButtonUpdate" runat="server" CommandName="Update" Text="Update" CausesValidation="true"/>
<asp:Button ID="ButtonCancel" runat="server" CommandName="Cancel" Text="Cancel" OnClick="ButtonCancel_Click" />
<asp:Button ID="ButtonClearEndDate" runat="server" Text="Clear End Date" OnClick="ButtonClearEndDate_Click" />
</EditItemTemplate>
<ItemTemplate>
<asp:Button ID="btnEditNotification" runat="server" Text="Edit" CommandName="Edit" CausesValidation="False" OnClick="btnEditNotification_Click"/>
<asp:Button ID="btnDeleteNotification" runat="server" Text="Delete" CommandName="Delete" CausesValidation="False" OnClientClick = " return confirm('Are you sure you want to delete this notification?');"/>
</ItemTemplate>
</asp:TemplateField>
</Columns>
<AlternatingRowStyle BackColor="LemonChiffon" />
</asp:GridView>
Dim gv As GridView = CType(sender, GridView)
gv.Rows(e.NewEditIndex).RowState = DataControlRowState.Edit
For i As Integer = 0 To gv.Rows.Count - 1
If i <> e.NewEditIndex Then
gridRow = gv.Rows(i)
For Each cell As Control In gridRow.Cells
For Each ctl As Control In cell.Controls
If TypeOf ctl Is DropDownList Then
foundDropList = CType(ctl, DropDownList)
If foundDropList.ID.Equals("ddNotificationNameUpdt") Then
Debug.Print("found the list")
dropListToUse = foundDropList
End If
End If
Next
Next
End If
Next
For Each item As ListItem In dropListToUse.Items
item.Attributes("Title") = NotificationNameTable(item.Text)
Next
I am expecting the user to click on the Edit button of the gridview and then dropdownlist of the row being edited to have new attributes called "Title" for each of the list items. Any help?
答案 0 :(得分：1)
我能够弄清楚。如果我使用RowDataBound事件来捕获GridView Edit按钮，并确保RowState和DataControlRowState.Edit都大于0，那么我将以所需的状态运行GridView。然后，我将能够使用e.Row.FindControl（）找到我的控件。然后，我遍历列表项并添加在屏幕上正确呈现的属性。