DetailsView.ModeChanging 事件
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。
当 DetailsView 控件尝试在编辑、插入和只读模式之间更改时，但在更新 CurrentMode 属性之前发生。
public:
event System::Web::UI::WebControls::DetailsViewModeEventHandler ^ ModeChanging;public event System.Web.UI.WebControls.DetailsViewModeEventHandler ModeChanging;member this.ModeChanging : System.Web.UI.WebControls.DetailsViewModeEventHandler Public Custom Event ModeChanging As DetailsViewModeEventHandler 事件类型
示例
下面的代码示例演示如何在控件处于编辑模式时DetailsView使用 ModeChanging 事件禁用分页功能。
<%@ 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 CustomerDetailView_ModeChanging(Object sender, DetailsViewModeEventArgs e)
{
// Disable the paging feature in edit mode.
if (e.NewMode == DetailsViewMode.Edit)
{
CustomerDetailView.AllowPaging = false;
}
else
{
CustomerDetailView.AllowPaging = true;
}
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>DetailsView ModeChanging Example</title>
</head>
<body>
<form id="Form1" runat="server">
<h3>DetailsView ModeChanging Example</h3>
<asp:detailsview id="CustomerDetailView"
datasourceid="DetailsViewSource"
datakeynames="CustomerID"
autogeneraterows="true"
autogenerateeditbutton="true"
allowpaging="true"
onmodechanging="CustomerDetailView_ModeChanging"
runat="server">
<fieldheaderstyle backcolor="Navy"
forecolor="White"/>
</asp:detailsview>
<!-- This example uses Microsoft SQL Server and connects -->
<!-- to the Northwind sample database. Use an ASP.NET -->
<!-- expression to retrieve the connection string value -->
<!-- from the web.config file. -->
<asp:SqlDataSource ID="DetailsViewSource" runat="server"
ConnectionString=
"<%$ ConnectionStrings:NorthWindConnectionString%>"
InsertCommand="INSERT INTO [Customers]([CustomerID], [CompanyName], [Address], [City], [PostalCode], [Country]) VALUES (@CustomerID, @CompanyName, @Address, @City, @PostalCode, @Country)"
SelectCommand="Select [CustomerID], [CompanyName],
[Address], [City], [PostalCode], [Country] From
[Customers]">
</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 CustomerDetailView_ModeChanging(ByVal sender As Object, ByVal e As DetailsViewModeEventArgs)
' Disable the paging feature in edit mode.
If e.NewMode = DetailsViewMode.Edit Then
CustomerDetailView.AllowPaging = False
Else
CustomerDetailView.AllowPaging = True
End If
End Sub
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>DetailsView ModeChanging Example</title>
</head>
<body>
<form id="Form1" runat="server">
<h3>DetailsView ModeChanging Example</h3>
<asp:detailsview id="CustomerDetailView"
datasourceid="DetailsViewSource"
datakeynames="CustomerID"
autogeneraterows="true"
autogenerateeditbutton="true"
allowpaging="true"
onmodechanging="CustomerDetailView_ModeChanging"
runat="server">
<fieldheaderstyle backcolor="Navy"
forecolor="White"/>
</asp:detailsview>
<!-- This example uses Microsoft SQL Server and connects -->
<!-- to the Northwind sample database. Use an ASP.NET -->
<!-- expression to retrieve the connection string value -->
<!-- from the web.config file. -->
<asp:SqlDataSource ID="DetailsViewSource" runat="server"
ConnectionString=
"<%$ ConnectionStrings:NorthWindConnectionString%>"
InsertCommand="INSERT INTO [Customers]([CustomerID], [CompanyName], [Address], [City], [PostalCode], [Country]) VALUES (@CustomerID, @CompanyName, @Address, @City, @PostalCode, @Country)"
SelectCommand="Select [CustomerID], [CompanyName],
[Address], [City], [PostalCode], [Country] From
[Customers]">
</asp:SqlDataSource>
</form>
</body>
</html>
注解
当ModeChangingDetailsView控件尝试在编辑、插入和只读模式之间更改时，但在更新 属性之前，将CurrentMode引发 该事件。 这允许你提供一个事件处理程序，用于在发生此事件时执行自定义例程，例如取消模式更改。
对象 DetailsViewModeEventArgs 将传递给事件处理程序，该处理程序允许你确定新模式、确定模式更改是用户取消编辑操作的结果，还是取消模式更改。 若要确定新模式，请使用 NewMode 属性。 若要确定模式更改是否是用户取消编辑操作的结果，请使用 CancelingEdit 属性。 可以通过将 属性设置为 Canceltrue来取消模式更改。
有关如何处理事件的详细信息，请参阅 处理和引发事件。
