ListView.EditItem 属性
定义
重要
一些信息与预发行产品相关,相应产品在发行之前可能会进行重大修改。 对于此处提供的信息,Microsoft 不作任何明示或暗示的担保。
获取 ListView 控件中处于编辑模式的项。
public:
virtual property System::Web::UI::WebControls::ListViewItem ^ EditItem { System::Web::UI::WebControls::ListViewItem ^ get(); };
[System.ComponentModel.Browsable(false)]
public virtual System.Web.UI.WebControls.ListViewItem EditItem { get; }
[<System.ComponentModel.Browsable(false)>]
member this.EditItem : System.Web.UI.WebControls.ListViewItem
Public Overridable ReadOnly Property EditItem As ListViewItem
属性值
ListView 控件中处于编辑模式的项;或者,如果没有项处于编辑模式,则为 null
。
- 属性
示例
以下示例演示如何通过使用 EditItem 属性来访问模板中包含的控件来检索处于编辑模式的 EditItemTemplate 项。
重要
此示例具有一个接受用户输入的文本框,这是一个潜在的安全威胁。 默认情况下,ASP.NET 网页验证用户输入是否不包含脚本或 HTML 元素。 有关详细信息,请参阅脚本侵入概述。
<%@ Page language="C#" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
void Page_Load()
{
Message.Text = String.Empty;
}
//<Snippet2>
void ProductsListView_ItemEditing(Object sender, ListViewEditEventArgs e)
{
ListViewItem item = ProductsListView.Items[e.NewEditIndex];
Label dateLabel = (Label)item.FindControl("DiscontinuedDateLabel");
if (String.IsNullOrEmpty(dateLabel.Text))
return;
//Verify if the item is discontinued.
DateTime discontinuedDate = DateTime.Parse(dateLabel.Text);
if (discontinuedDate < DateTime.Now)
{
Message.Text = "You cannot edit a discontinued item.";
e.Cancel = true;
ProductsListView.SelectedIndex = -1;
}
}
//</Snippet2>
void DiscontinuedDateCalendar_OnSelectionChanged(Object sender, EventArgs e)
{
TextBox dateTextBox =
(TextBox)ProductsListView.EditItem.FindControl("DiscontinuedDateTextBox");
Calendar calendarObject = (Calendar)sender;
dateTextBox.Text = calendarObject.SelectedDate.ToString("d");
}
DateTime GetDateTime(object dateValue)
{
if (dateValue == DBNull.Value)
return DateTime.Now;
else
return (DateTime)dateValue;
}
protected void ProductsListView_PagePropertiesChanging(object sender, PagePropertiesChangingEventArgs e)
{
// Clears the edit index selection when paging.
ProductsListView.EditIndex = -1;
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
<title>ListView Edit Item Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>ListView Edit Item Example</h3>
<asp:Label ID="Message"
ForeColor="Red"
runat="server"/>
<br/>
<asp:ListView ID="ProductsListView"
DataSourceID="ProductsDataSource"
DataKeyNames="ProductID"
OnItemEditing="ProductsListView_ItemEditing"
ConvertEmptyStringToNull="true"
OnPagePropertiesChanging="ProductsListView_PagePropertiesChanging"
runat="server" >
<LayoutTemplate>
<table cellpadding="2" runat="server" id="tblProducts" width="640px">
<tr runat="server" id="itemPlaceholder" />
</table>
<asp:DataPager runat="server" ID="ProductsDataPager" PageSize="12">
<Fields>
<asp:NextPreviousPagerField
ShowFirstPageButton="true" ShowLastPageButton="true"
FirstPageText="|<< " LastPageText=" >>|"
NextPageText=" > " PreviousPageText=" < " />
</Fields>
</asp:DataPager>
</LayoutTemplate>
<ItemTemplate>
<tr runat="server">
<td valign="top">
<asp:LinkButton ID="EditButton" runat="server" Text="Edit" CommandName="Edit" />
</td>
<td valign="top">
<asp:Label ID="NameLabel" runat="server" Text='<%#Eval("Name") %>' />
</td>
<td valign="top">
<asp:Label ID="ProductNumberLabel" runat="server" Text='<%#Eval("ProductNumber") %>' />
</td>
<td>
<asp:Label ID="DiscontinuedDateLabel" runat="server"
Text='<%#Eval("DiscontinuedDate", "{0:d}") %>' />
</td>
</tr>
</ItemTemplate>
<EditItemTemplate>
<tr style="background-color:#ADD8E6">
<td valign="top">
<asp:LinkButton ID="UpdateButton" runat="server"
CommandName="Update" Text="Update" /><br />
<asp:LinkButton ID="CancelButton" runat="server"
CommandName="Cancel" Text="Cancel" />
</td>
<td valign="top" colspan="2">
<asp:Label runat="server" ID="NameLabel"
AssociatedControlID="NameTextBox"
Text="Name"/>
<asp:TextBox ID="NameTextBox" runat="server"
Text='<%#Bind("Name") %>' MaxLength="50" /><br />
<asp:Label runat="server" ID="ProductNumberLabel"
AssociatedControlID="ProductNumberTextBox"
Text="Product Number" />
<asp:TextBox ID="ProductNumberTextBox" runat="server"
Text='<%#Bind("ProductNumber") %>' MaxLength="25" /><br />
</td>
<td>
<asp:Label runat="server" ID="DiscontinuedDateLabel"
AssociatedControlID="DiscontinuedDateTextBox"
Text="Discontinued Date"/>
<asp:TextBox ID="DiscontinuedDateTextBox" runat="server"
Text='<%# Bind("DiscontinuedDate", "{0:d}") %>'
MaxLength="10" /><br />
<asp:Calendar ID="DiscontinuedDateCalendar" runat="server"
SelectedDate='<%# GetDateTime(Eval("DiscontinuedDate")) %>'
OnSelectionChanged="DiscontinuedDateCalendar_OnSelectionChanged" />
</td>
</tr>
</EditItemTemplate>
</asp:ListView>
<!-- This example uses Microsoft SQL Server and connects -->
<!-- to the AdventureWorks sample database. Use an ASP.NET -->
<!-- expression to retrieve the connection string value -->
<!-- from the Web.config file. -->
<asp:SqlDataSource ID="ProductsDataSource" runat="server"
ConnectionString="<%$ ConnectionStrings:AdventureWorks_DataConnectionString %>"
SelectCommand="SELECT [ProductID], [Name], [ProductNumber], [DiscontinuedDate]
FROM Production.Product"
UpdateCommand="UPDATE Production.Product
SET Name = @Name, ProductNumber = @ProductNumber, DiscontinuedDate = @DiscontinuedDate
WHERE ProductID = @ProductID">
</asp:SqlDataSource>
</form>
</body>
</html>
<%@ Page language="VB" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
Sub Page_Load()
Message.Text = String.Empty
End Sub
'<Snippet2>
Sub ProductsListView_ItemEditing(ByVal sender As Object, ByVal e As ListViewEditEventArgs)
Dim item As ListViewItem = ProductsListView.Items(e.NewEditIndex)
Dim dateLabel As Label = CType(item.FindControl("DiscontinuedDateLabel"), Label)
If String.IsNullOrEmpty(dateLabel.Text) Then _
Return
'Verify if the item is discontinued.
Dim discontinuedDate As DateTime = DateTime.Parse(dateLabel.Text)
If discontinuedDate < DateTime.Now Then
Message.Text = "You cannot edit a discontinued item."
e.Cancel = True
ProductsListView.SelectedIndex = -1
End If
End Sub
'</Snippet2>
Sub DiscontinuedDateCalendar_OnSelectionChanged(ByVal sender As Object, ByVal e As EventArgs)
Dim dateTextBox As TextBox = _
CType(ProductsListView.EditItem.FindControl("DiscontinuedDateTextBox"), TextBox)
Dim calendarObject As Calendar = CType(sender, Calendar)
dateTextBox.Text = calendarObject.SelectedDate.ToString("d")
End Sub
Function GetDateTime(ByVal dateValue As Object) As DateTime
If dateValue Is DBNull.Value Then
Return DateTime.Now
Else
Return CType(dateValue, DateTime)
End If
End Function
Protected Sub ProductsListView_PagePropertiesChanging(ByVal sender As Object, _
ByVal e As PagePropertiesChangingEventArgs)
' Clears the edit index selection when paging.
ProductsListView.EditIndex = -1
End Sub
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
<title>ListView Edit Item Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>ListView Edit Item Example</h3>
<asp:Label ID="Message"
ForeColor="Red"
runat="server"/>
<br/>
<asp:ListView ID="ProductsListView"
DataSourceID="ProductsDataSource"
DataKeyNames="ProductID"
OnItemEditing="ProductsListView_ItemEditing"
ConvertEmptyStringToNull="true"
OnPagePropertiesChanging="ProductsListView_PagePropertiesChanging"
runat="server" >
<LayoutTemplate>
<table cellpadding="2" runat="server" id="tblProducts" width="640px">
<tr runat="server" id="itemPlaceholder" />
</table>
<asp:DataPager runat="server" ID="ProductsDataPager" PageSize="12">
<Fields>
<asp:NextPreviousPagerField
ShowFirstPageButton="true" ShowLastPageButton="true"
FirstPageText="|<< " LastPageText=" >>|"
NextPageText=" > " PreviousPageText=" < " />
</Fields>
</asp:DataPager>
</LayoutTemplate>
<ItemTemplate>
<tr runat="server">
<td valign="top">
<asp:LinkButton ID="EditButton" runat="server" Text="Edit" CommandName="Edit" />
</td>
<td valign="top">
<asp:Label ID="NameLabel" runat="server" Text='<%#Eval("Name") %>' />
</td>
<td valign="top">
<asp:Label ID="ProductNumberLabel" runat="server" Text='<%#Eval("ProductNumber") %>' />
</td>
<td>
<asp:Label ID="DiscontinuedDateLabel" runat="server"
Text='<%#Eval("DiscontinuedDate", "{0:d}") %>' />
</td>
</tr>
</ItemTemplate>
<EditItemTemplate>
<tr style="background-color:#ADD8E6">
<td valign="top">
<asp:LinkButton ID="UpdateButton" runat="server"
CommandName="Update" Text="Update" /><br />
<asp:LinkButton ID="CancelButton" runat="server"
CommandName="Cancel" Text="Cancel" />
</td>
<td valign="top" colspan="2">
<asp:Label runat="server" ID="NameLabel"
AssociatedControlID="NameTextBox"
Text="Name"/>
<asp:TextBox ID="NameTextBox" runat="server"
Text='<%#Bind("Name") %>' MaxLength="50" /><br />
<asp:Label runat="server" ID="ProductNumberLabel"
AssociatedControlID="ProductNumberTextBox"
Text="Product Number" />
<asp:TextBox ID="ProductNumberTextBox" runat="server"
Text='<%#Bind("ProductNumber") %>' MaxLength="25" /><br />
</td>
<td>
<asp:Label runat="server" ID="DiscontinuedDateLabel"
AssociatedControlID="DiscontinuedDateTextBox"
Text="Discontinued Date"/>
<asp:TextBox ID="DiscontinuedDateTextBox" runat="server"
Text='<%# Bind("DiscontinuedDate", "{0:d}") %>'
MaxLength="10" /><br />
<asp:Calendar ID="DiscontinuedDateCalendar" runat="server"
SelectedDate='<%# GetDateTime(Eval("DiscontinuedDate")) %>'
OnSelectionChanged="DiscontinuedDateCalendar_OnSelectionChanged" />
</td>
</tr>
</EditItemTemplate>
</asp:ListView>
<!-- This example uses Microsoft SQL Server and connects -->
<!-- to the AdventureWorks sample database. Use an ASP.NET -->
<!-- expression to retrieve the connection string value -->
<!-- from the Web.config file. -->
<asp:SqlDataSource ID="ProductsDataSource" runat="server"
ConnectionString="<%$ ConnectionStrings:AdventureWorks_DataConnectionString %>"
SelectCommand="SELECT [ProductID], [Name], [ProductNumber], [DiscontinuedDate]
FROM Production.Product"
UpdateCommand="UPDATE Production.Product
SET Name = @Name, ProductNumber = @ProductNumber, DiscontinuedDate = @DiscontinuedDate
WHERE ProductID = @ProductID">
</asp:SqlDataSource>
</form>
</body>
</html>
注解
EditItem使用 属性访问控件中处于编辑模式的ListView项。 编辑项的内容由 EditItemTemplate 属性定义。