ListView.ItemInserted 事件

参考

定义

命名空间:: System.Web.UI.WebControls

程序集:: System.Web.Extensions.dll

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。

在请求插入操作且 ListView 控件在数据源中插入项之后发生。

public:
 event EventHandler<System::Web::UI::WebControls::ListViewInsertedEventArgs ^> ^ ItemInserted;

public event EventHandler<System.Web.UI.WebControls.ListViewInsertedEventArgs> ItemInserted;

member this.ItemInserted : EventHandler<System.Web.UI.WebControls.ListViewInsertedEventArgs>

Public Custom Event ItemInserted As EventHandler(Of ListViewInsertedEventArgs)

事件类型

EventHandler<ListViewInsertedEventArgs>

示例

以下示例演示如何为 ItemInserted 事件添加事件处理程序。

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">

  //<Snippet3>
  void ContactsListView_ItemInserted(Object sender, ListViewInsertedEventArgs e)
  {
    if (e.Exception != null)
    {
      if (e.AffectedRows == 0)
      {
        e.KeepInInsertMode = true;
        Message.Text = "An exception occurred inserting the new Contact. " +
          "Please verify your values and try again.";
      }
      else
        Message.Text = "An exception occurred inserting the new Contact. " +
          "Please verify the values in the newly inserted item.";

      e.ExceptionHandled = true;
    }
  }
  //</Snippet3>

  protected void Page_Load(object sender, EventArgs e)
  {
    Message.Text = "";
  }
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
  <head id="Head1" runat="server">
    <title>ListView.ItemInserted Example</title>
  </head>
  <body>
    <form id="form1" runat="server">
        
      <h3>ListViewItemInserted Example</h3>
            
      <asp:Label ID="Message"
        ForeColor="Red"          
        runat="server"/>
      <br/>
      
      <asp:ListView ID="ContactsListView" 
        DataSourceID="ContactsDataSource" 
        DataKeyNames="ContactID"
        OnItemInserted="ContactsListView_ItemInserted"  
        InsertItemPosition="LastItem"
        runat="server">
        <LayoutTemplate>
          <table cellpadding="2" border="1" runat="server" id="tblContacts" width="640px">
            <tr runat="server" id="itemPlaceholder" />
          </table>
          <asp:DataPager runat="server" ID="PeopleDataPager" PageSize="12">
            <Fields>
              <asp:NextPreviousPagerField 
                ShowFirstPageButton="true" ShowLastPageButton="true"
                FirstPageText="|&lt;&lt; " LastPageText=" &gt;&gt;|"
                NextPageText=" &gt; " PreviousPageText=" &lt; " />
            </Fields>
          </asp:DataPager>
        </LayoutTemplate>
        <ItemTemplate>
          <tr runat="server">
            <td valign="top">
              <asp:Label ID="FirstNameLabel" runat="server" Text='<%#Eval("FirstName") %>' />
              <asp:Label ID="LastNameLabel" runat="server" Text='<%#Eval("LastName") %>' />
            </td>
            <td>&nbsp;
              <asp:Label ID="EmailLabel" runat="server" Text='<%#Eval("EmailAddress") %>' />
            </td>
          </tr>
        </ItemTemplate>
        <InsertItemTemplate>
          <tr style="background-color:#D3D3D3">
            <td valign="top">
              <asp:Label runat="server" ID="FirstNameLabel" 
                AssociatedControlID="FirstNameTextBox" Text="First Name"/>
              <asp:TextBox ID="FirstNameTextBox" runat="server" 
                Text='<%#Bind("FirstName") %>' /><br />
              <asp:Label runat="server" ID="LastNameLabel" 
                AssociatedControlID="LastNameTextBox" Text="Last Name" />
              <asp:TextBox ID="LastNameTextBox" runat="server" 
                Text='<%#Bind("LastName") %>' /><br />
              <asp:Label runat="server" ID="EmailLabel" 
                AssociatedControlID="EmailTextBox" Text="Email" />
              <asp:TextBox ID="EmailTextBox" runat="server" 
                Text='<%#Bind("EmailAddress") %>' />
            </td>
            <td>
              <asp:LinkButton ID="InsertButton" runat="server" 
                CommandName="Insert" Text="Insert" />
            </td>
          </tr>
        </InsertItemTemplate>
      </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="ContactsDataSource" runat="server" 
        ConnectionString="<%$ ConnectionStrings:AdventureWorks_DataConnectionString %>"
        SelectCommand="SELECT [ContactID], [FirstName], [LastName], [EmailAddress] 
          FROM Person.Contact"
        InsertCommand="INSERT INTO Person.Contact
          ([FirstName], [LastName], [EmailAddress], [PasswordHash], [PasswordSalt]) 
          Values(@FirstName, @LastName, @EmailAddress, '', '');
          SELECT @ContactID = SCOPE_IDENTITY()">
        <InsertParameters>
          <asp:Parameter Name="FirstName" />
          <asp:Parameter Name="LastName" />
          <asp:Parameter Name="EmailAddress" />
          <asp:Parameter Name="ContactID" Type="Int32" Direction="Output" />
        </InsertParameters>
      </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">

  '<Snippet3>
  Sub ContactsListView_ItemInserted(ByVal sender As Object, ByVal e As ListViewInsertedEventArgs)

    If e.Exception IsNot Nothing Then

      If e.AffectedRows = 0 Then
        e.KeepInInsertMode = True
        Message.Text = "An exception occurred inserting the new Contact. " & _
          "Please verify your values and try again."
      Else
        Message.Text = "An exception occurred inserting the new Contact. " & _
          "Please verify the values in the newly inserted item."
      End If

      e.ExceptionHandled = True
    End If
  End Sub
  '</Snippet3>

  Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs)
    Message.Text = ""
  End Sub
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
  <head id="Head1" runat="server">
    <title>ListView.ItemInserted Example</title>
  </head>
  <body>
    <form id="form1" runat="server">
        
      <h3>ListViewItemInserted Example</h3>
            
      <asp:Label ID="Message"
        ForeColor="Red"          
        runat="server"/>
      <br/>
      
      <asp:ListView ID="ContactsListView" 
        DataSourceID="ContactsDataSource" 
        DataKeyNames="ContactID"
        OnItemInserted="ContactsListView_ItemInserted"  
        InsertItemPosition="LastItem"
        runat="server">
        <LayoutTemplate>
          <table cellpadding="2" border="1" runat="server" id="tblContacts" width="640px">
            <tr runat="server" id="itemPlaceholder" />
          </table>
          <asp:DataPager runat="server" ID="PeopleDataPager" PageSize="12">
            <Fields>
              <asp:NextPreviousPagerField 
                ShowFirstPageButton="true" ShowLastPageButton="true"
                FirstPageText="|&lt;&lt; " LastPageText=" &gt;&gt;|"
                NextPageText=" &gt; " PreviousPageText=" &lt; " />
            </Fields>
          </asp:DataPager>
        </LayoutTemplate>
        <ItemTemplate>
          <tr runat="server">
            <td valign="top">
              <asp:Label ID="FirstNameLabel" runat="server" Text='<%#Eval("FirstName") %>' />
              <asp:Label ID="LastNameLabel" runat="server" Text='<%#Eval("LastName") %>' />
            </td>
            <td>&nbsp;
              <asp:Label ID="EmailLabel" runat="server" Text='<%#Eval("EmailAddress") %>' />
            </td>
          </tr>
        </ItemTemplate>
        <InsertItemTemplate>
          <tr style="background-color:#D3D3D3">
            <td valign="top">
              <asp:Label runat="server" ID="FirstNameLabel" 
                AssociatedControlID="FirstNameTextBox" Text="First Name"/>
              <asp:TextBox ID="FirstNameTextBox" runat="server" 
                Text='<%#Bind("FirstName") %>' /><br />
              <asp:Label runat="server" ID="LastNameLabel" 
                AssociatedControlID="LastNameTextBox" Text="Last Name" />
              <asp:TextBox ID="LastNameTextBox" runat="server" 
                Text='<%#Bind("LastName") %>' /><br />
              <asp:Label runat="server" ID="EmailLabel" 
                AssociatedControlID="EmailTextBox" Text="Email" />
              <asp:TextBox ID="EmailTextBox" runat="server" 
                Text='<%#Bind("EmailAddress") %>' />
            </td>
            <td>
              <asp:LinkButton ID="InsertButton" runat="server" 
                CommandName="Insert" Text="Insert" />
            </td>
          </tr>
        </InsertItemTemplate>
      </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="ContactsDataSource" runat="server" 
        ConnectionString="<%$ ConnectionStrings:AdventureWorks_DataConnectionString %>"
        SelectCommand="SELECT [ContactID], [FirstName], [LastName], [EmailAddress] 
          FROM Person.Contact"
        InsertCommand="INSERT INTO Person.Contact
          ([FirstName], [LastName], [EmailAddress], [PasswordHash], [PasswordSalt]) 
          Values(@FirstName, @LastName, @EmailAddress, '', '');
          SELECT @ContactID = SCOPE_IDENTITY()">
        <InsertParameters>
          <asp:Parameter Name="FirstName" />
          <asp:Parameter Name="LastName" />
          <asp:Parameter Name="EmailAddress" />
          <asp:Parameter Name="ContactID" Type="Int32" Direction="Output" />
        </InsertParameters>
      </asp:SqlDataSource>
      
    </form>
  </body>
</html>

注解

在 ListView 控件在数据源中插入项 ItemInserted 后，单击模板中的 InsertItemTemplate “插入”按钮或 InsertNewItem 调用方法时 ListView ，控件将引发事件。 (“插入”按钮是一个按钮控件，其 CommandName 属性设置为“Insert”。) 这样，每当发生此事件时，就可以执行自定义例程，例如检查插入操作的结果。

对象 ListViewInsertedEventArgs 将传递给事件处理程序，这使你可以确定受影响的记录数。它还允许你确定可能发生的异常。若要确定受插入操作影响的记录数，请使用 AffectedRows 属性。若要确定是否发生任何异常，请使用 Exception 属性。还可以通过设置 ExceptionHandled 属性来指示是否在事件处理程序中处理了异常。如果要访问插入记录的值，请使用 Values 属性。

AffectedRows如果属性报告未插入任何项，可以通过将属性true设置为 KeepInInsertMode 来将插入值InsertItemTemplate重新绑定到模板。

有关如何处理事件的详细信息，请参阅处理和引发事件。

适用于

通过

ListView.ItemInserted 事件

定义

事件类型

示例

注解

适用于

另请参阅

其他资源