DetailsView.ModeChanging 事件

定义

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。Occurs when a DetailsView control attempts to change between edit, insert, and read-only mode, but before the CurrentMode property is updated.

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 

示例

下面的代码示例演示如何使用ModeChanging事件在DetailsView控件处于编辑模式时禁用分页功能。The following code example demonstrates how to use the ModeChanging event to disable the paging feature when the DetailsView control is in edit mode.


<%@ 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

当控件尝试在编辑、插入和只读CurrentMode模式之间更改时, 但在更新属性之前, 会引发事件。ModeChanging DetailsViewThe ModeChanging event is raised when a DetailsView control attempts to change between edit, insert, and read-only mode, but before the CurrentMode property is updated. 这允许你提供一个事件处理程序, 以便在每次发生此事件时执行自定义例程, 如取消模式更改。This allows you to provide an event handler that performs a custom routine, such as canceling the mode change, whenever this event occurs.

DetailsViewModeEventArgs对象将传递到事件处理程序, 该处理程序允许您确定新模式, 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。A DetailsViewModeEventArgs object is passed to the event handler, which allows you to determine the new mode, to determine whether the mode change was a result of the user canceling an edit operation, or to cancel the mode change. 若要确定新模式, 请使用NewMode属性。To determine the new mode, use the NewMode property. 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。To determine whether the mode change was a result of the user canceling an edit operation, use the CancelingEdit property. 您可以通过将Cancel属性设置为来true取消模式更改。You can cancel the mode change by setting the Cancel property to true.

有关如何处理事件的详细信息, 请参阅处理和引发事件For more information about how to handle events, see Handling and Raising Events.

适用于

另请参阅