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我有一個與父網格的行在一對多關係上關聯的圖像的嵌套網格視圖。該結構包含在用戶控件中。這些圖像通過文件上傳控件上傳，並存儲在服務器上的文件夾中。當圖像網格的行被刪除時，我從OnRowDeleting事件中的服務器中刪除圖像。奇怪的是，當你刪除一行時，會發生回傳，並且OnRowDeleting事件觸發，記錄將從數據庫中刪除，但該行不會從UI中消失，直到您再次刪除它爲止。更令人沮喪的是，當我在OnRowDeleting事件中註釋掉代碼時，該行立即刪除。這裏發生了什麼？在OnRowDeleting事件後沒有（完全）刪除嵌套的gridview行
<%@ Control Language="C#" AutoEventWireup="true" CodeFile="OrderItemView.ascx.cs" Inherits="Controls_OrderItemView" EnableTheming="true" EnableViewState="true"%>
<asp:GridView ID="OrderItemList" runat="server" AutoGenerateColumns="False"
DataKeyNames="Id,ConcurrencyId" DataSourceID="OrderItemDataSource"
SkinID="Blue" OnRowDataBound="OrderItemList_RowDataBound"
EnableModelValidation="True" Width="100%"
OnRowUpdating="OrderItemList_RowUpdating"
OnRowUpdated="OrderItemList_RowUpdated" AllowSorting="True" >
<Columns>
<asp:TemplateField ShowHeader="False">
<ItemTemplate>
<asp:ImageButton ID="ImageButtonConfirmDelete" runat="server"
CausesValidation="False" CommandName="Delete" ImageUrl="../Images/Grid_ActionDelete.gif"
OnClientClick='return confirm("Are you sure you want to delete this Order Item? This cannot be undone.");'/>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Item Name" SortExpression="OrderItemName">
<ItemTemplate>
<asp:Label ID="Label2" runat="server" Text='<%# Bind("OrderItemName") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Images">
<ItemTemplate>
<a href="" data-id='<%# Eval("id","imageHeader_{0}") %>' class="expandImages">
<asp:Label ID="Label3" runat="server"
Text='<%# string.Format("{0} Image{1}", Helpers.GetImageCount(new Guid(Eval("Id").ToString())), Helpers.GetImageCount(new Guid(Eval("Id").ToString())) != 1 ? "s" : "") %>'>
</asp:Label>
</a>
<div id='<%# Eval("id","images_{0}") %>' class="imageDisplay">
<asp:GridView ID="gvImages" runat="server" SkinID="Blue"
DataKeyNames="Id" EnableModelValidation="True"
DataSourceID="ImageDataSource" AutoGenerateColumns="False"
ShowHeader="False" onrowdeleting="gvImages_RowDeleting">
<Columns>
<asp:TemplateField ShowHeader="false">
<ItemTemplate>
<asp:ImageButton ID="ImageButtonConfirmDeleteImage" runat="server"
CausesValidation="False" CommandName="Delete" ImageUrl="../Images/Grid_ActionDelete.gif"/>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField ShowHeader="false">
<EditItemTemplate>
<asp:TextBox ID="TextBox1" runat="server" Text='<%# Bind("FileName") %>'></asp:TextBox>
</EditItemTemplate>
<ItemTemplate>
<a href="" data-id='<%# Eval("id","image_{0}") %>' onclick='showImage("<%# Eval("ImageUrl") %>"); return false;'>
<asp:Label ID="Label1" runat="server" Text='<%# Bind("FileName") %>' ToolTip="Click to Preview Image"></asp:Label>
</a>
</ItemTemplate>
</asp:TemplateField>
</Columns>
<EmptyDataTemplate>
<div style="color: Blue; font-style: italic;">No Images</div>
</EmptyDataTemplate>
</asp:GridView>
<asp:FileUpload ID="FileUpload1" runat="server"/>
<asp:Button ID="btnUploadImage" runat="server" Text="Upload" CommandArgument='<%# Eval("Id") %>'
CommandName="orderItemId" oncommand="btnUploadImage_Command"/>
<asp:ObjectDataSource ID="ImageDataSource" runat="server"
DataObjectTypeName="OrderSite.Entities.OrderItemImage"
DeleteMethod="Delete" InsertMethod="Save"
OldValuesParameterFormatString="original_{0}" SelectMethod="GetList"
TypeName="OrderSite.Bll.OrderItemImageManager" UpdateMethod="Save"
SelectCountMethod="SelectCountForGetList">
<SelectParameters>
<asp:Parameter DbType="Guid" Name="orderItemId"/>
</SelectParameters>
</asp:ObjectDataSource>
</div>
</ItemTemplate>
</asp:TemplateField>
</Columns>
<EmptyDataTemplate>
<div style="padding: 3px 0 3px 3px 3px;">No Order Items Exist</div>
</EmptyDataTemplate>
</asp:GridView>
<asp:ObjectDataSource ID="OrderItemDataSource" runat="server"
DataObjectTypeName="OrderSite.Entities.OrderItem"
DeleteMethod="Delete" InsertMethod="Save"
OldValuesParameterFormatString="original_{0}" SelectMethod="GetList"
TypeName="OrderSite.Bll.OrderItemManager" UpdateMethod="Save"
OnInserting="OrderItemDataSource_OnInserting"
SortParameterName="sortExpression" SelectCountMethod="SelectCountForGetList">
<SelectParameters>
<asp:Parameter DbType="Guid" Name="orderFormId" />
<asp:Parameter Name="sortExpression" Type="String" />
</SelectParameters>
</asp:ObjectDataSource>
我在父頁面註釋掉任何包含的UpdatePanel，因爲他們可以永遠是罪魁禍首，但沒有效果。
這裏是OnRowDeleting事件：
protected void gvImages_RowDeleting(object sender, GridViewDeleteEventArgs e)
{
// Also delete the file from the images folder
OrderItemImage myImage = OrderItemImageManager.GetItem((Guid)e.Keys["Id"]);
if (myImage != null)
{
string path = string.Format("../Images/OrderItemImages/{0}", myImage.OrderItemId.ToString());
if (File.Exists(Server.MapPath(string.Format("{0}/{1}", path, myImage.FileName))))
{
File.Delete(Server.MapPath(string.Format("{0}/{1}", path, myImage.FileName)));
// if there are no images left in folder, then delete it (only deletes empty directory)
if (Directory.GetFiles(Server.MapPath(path), "*.*", SearchOption.TopDirectoryOnly).Length == 0)
Directory.Delete(Server.MapPath(path));
}
OrderItemList.DataBind();
}
}
我在此之前已經做了，暫時還沒有問題，所以任何幫助將不勝感激！