Gridview 行编辑 - 动态绑定到 DropDownList [英] Gridview row editing - dynamic binding to a DropDownList
问题描述
我试图让 ASP.NET 3.5 GridView 在显示时将选定的值显示为字符串,并显示一个 DropDownList 以允许我在编辑时从给定的选项列表中选择一个值.看起来够简单吗?
I'm trying to get an ASP.NET 3.5 GridView to show a selected value as string when being displayed, and to show a DropDownList to allow me to pick a value from a given list of options when being edited. Seems simple enough?
我的 gridview 看起来像这样(简化):
My gridview looks like this (simplified):
<asp:GridView ID="grvSecondaryLocations" runat="server"
DataKeyNames="ID" OnInit="grvSecondaryLocations_Init"
OnRowCommand="grvSecondaryLocations_RowCommand"
OnRowCancelingEdit="grvSecondaryLocations_RowCancelingEdit"
OnRowDeleting="grvSecondaryLocations_RowDeleting"
OnRowEditing="grvSecondaryLocations_RowEditing"
OnRowUpdating="grvSecondaryLocations_RowUpdating" >
<Columns>
<asp:TemplateField>
<ItemTemplate>
<asp:Label ID="lblPbxTypeCaption" runat="server"
Text='<%# Eval("PBXTypeCaptionValue") %>' />
</ItemTemplate>
<EditItemTemplate>
<asp:DropDownList ID="ddlPBXTypeNS" runat="server"
Width="200px"
DataTextField="CaptionValue"
DataValueField="OID" />
</EditItemTemplate>
</asp:TemplateField>
</asp:GridView>
网格在未处于编辑模式时显示正常 - 所选的 PBX 类型在 asp:Label 控件中显示其值.毫不奇怪.
The grid gets displayed OK when not in editing mode - the selected PBX type shows its value in the asp:Label control. No surprise there.
我将 DropDownList 的值列表加载到表单的 OnLoad
事件中名为 _pbxTypes
的本地成员中.我验证了这一点 - 它有效,值就在那里.
I load the list of values for the DropDownList into a local member called _pbxTypes
in the OnLoad
event of the form. I verified this - it works, the values are there.
现在我的挑战是:当网格进入特定行的编辑模式时,我需要绑定存储在 _pbxTypes
中的 PBX 列表.
Now my challenge is: when the grid goes into editing mode for a particular row, I need to bind the list of PBX's stored in _pbxTypes
.
很简单,我想 - 只需在 RowEditing
事件中抓取下拉列表对象并附加列表:
Simple enough, I thought - just grab the drop down list object in the RowEditing
event and attach the list:
protected void grvSecondaryLocations_RowEditing(object sender, GridViewEditEventArgs e)
{
grvSecondaryLocations.EditIndex = e.NewEditIndex;
GridViewRow editingRow = grvSecondaryLocations.Rows[e.NewEditIndex];
DropDownList ddlPbx = (editingRow.FindControl("ddlPBXTypeNS") as DropDownList);
if (ddlPbx != null)
{
ddlPbx.DataSource = _pbxTypes;
ddlPbx.DataBind();
}
.... (more stuff)
}
问题是 - 我从来没有从 FindControl
调用中得到任何东西 - 似乎 ddlPBXTypeNS
不存在(或找不到).
Trouble is - I never get anything back from the FindControl
call - seems like the ddlPBXTypeNS
doesn't exist (or can't be found).
我错过了什么??一定是非常愚蠢的事情......但到目前为止,我所有的谷歌搜索、阅读 GridView 控件以及询问好友都没有帮助.
What am I missing?? Must be something really stupid.... but so far, all my Googling, reading up on GridView controls, and asking buddies hasn't helped.
谁能发现缺失的链接?;-)
Who can spot the missing link? ;-)
推荐答案
很简单...你做错了,因为那个事件控件不存在:
Quite easy... You're doing it wrong, because by that event the control is not there:
protected void gv_RowDataBound(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.DataRow &&
(e.Row.RowState & DataControlRowState.Edit) == DataControlRowState.Edit)
{
// Here you will get the Control you need like:
DropDownList dl = (DropDownList)e.Row.FindControl("ddlPBXTypeNS");
}
}
也就是说,它只对 DataRow
(包含数据的实际行)有效,如果它处于 Edit 模式......因为你只编辑一个一次排.e.Row.FindControl("ddlPBXTypeNS")
只会找到你想要的控件.
That is, it will only be valid for a DataRow
(the actually row with data), and if it's in Edit mode... because you only edit one row at a time. The e.Row.FindControl("ddlPBXTypeNS")
will only find the control that you want.
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