[英]How do I delete an item from a ListView using a custom DataSource?
我有一个ListView
和一个从方法拉出的IEnumerable<MyDocument>
DataSource
。
myDocsList_ItemCommand()
的代码肯定可以运行,因为实际上已删除了该文档。 我的问题是,即使我有执行myDocsList.Items.Remove(dataItem)
代码, ListView
仍会显示(已删除)的文档,直到下一页刷新为止。
简化的.ascx基本上是:
<asp:ListView id="myDocsList" runat="server"
OnItemDataBound="myDocsList_ItemDataBound"
OnItemDeleting="myDocsList_ItemDeleting"
OnItemCommand="myDocsList_ItemCommand">
<LayoutTemplate>
<table>
<asp:Placeholder id="itemPlaceholder" runat="server" />
</table>
</LayoutTemplate>
<ItemTemplate>
<tr><td>
<asp:LinkButton
ID="delete" runat="server"
CommandName="Delete" CommandArgument="X"
OnClientClick="javascript:return confirm('...');">
Delete
</asp:LinkButton>
</td></tr>
</ItemTemplate>
</asp:ListView>
简化的.ascx.cs基本上是:
protected void Page_Load(object sender, EventArgs e)
{
}
protected void Page_PreRender(object sender, EventArgs e)
{
if (!IsPostBack)
{
IEnumerable<MyDocument> docs = getDocuments();
myDocsList.DataSource = docs;
myDocsList.DataBind();
}
}
/* so we have the ID of the document we're deleting later on */
protected void myDocsList_ItemDataBound(object sender,
ListViewItemEventArgs e)
{
var deleteButton =
(LinkButton) ((Control) e.Item).FindControl("delete");
deleteButton.CommandArgument =
((MyDocument) e.Item.DataItem).id.ToString();
}
/* or we get "raised event ItemDeleting which wasn't handled" */
protected void myDocsList_ItemDeleting(Object sender,
ListViewDeleteEventArgs e)
{
}
/* do something here? */
//protected void myDocsList_ItemDeleted(Object sender,
// ListViewDeletedEventArgs e)
//{
//}
protected void myDocsList_ItemCommand(object sender,
ListViewCommandEventArgs e)
{
if (e.CommandName == "Delete")
{
int docId = int.Parse(e.CommandArgument.ToString());
deleteDocument(docId);
ListViewDataItem dataItem = (ListViewDataItem) e.Item;
myDocsList.Items.Remove(dataItem);
}
}
我一直在阅读ASP页面的生命周期以及一些相关的问题,但是我对ASP缺乏经验并且有点迷茫。
如何使ListView项目在PostBack上消失而不是在下一页刷新时消失?
您必须在ItemCommand
事件中将数据反弹到ListView
,您可以如下更改编码样式:
//Create a new method for databind
void BindData()
{
IEnumerable<MyDocument> docs = getDocuments();
myDocsList.DataSource = docs;
myDocsList.DataBind();
}
//Call databind method in your prerender event
protected void Page_PreRender(object sender, EventArgs e)
{
if (!IsPostBack)
{
BindData();
}
}
//Again bind data after delete operation
protected void myDocsList_ItemCommand(object sender,
ListViewCommandEventArgs e)
{
if (e.CommandName == "Delete")
{
int docId = int.Parse(e.CommandArgument.ToString());
deleteDocument(docId);
BindData();
}
}
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