ListViewInsertedEventArgs 类

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。

为 ItemInserted 事件提供数据。

public ref class ListViewInsertedEventArgs : EventArgs

public class ListViewInsertedEventArgs : EventArgs

type ListViewInsertedEventArgs = class
    inherit EventArgs

Public Class ListViewInsertedEventArgs
Inherits EventArgs

继承: Object

EventArgs
ListViewInsertedEventArgs

示例

下面的示例演示如何使用 ListViewInsertedEventArgs 传递给事件的处理程序的对象 ItemInserted 。

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

当单击模板中的InsertItemTemplate“插入”按钮时，控件ListView将引发 ItemInserted 事件，并在控件更新数据源中的记录之后ListView。 (“插入”按钮是属性设置为“Insert”的 CommandName 按钮。) 事件 ItemInserted 允许您执行自定义操作，例如从数据库中检索插入项的自动生成的值。

将 ListViewInsertedEventArgs 对象传递给事件处理方法，通过该方法可以确定插入的项数以及可能发生的任何异常。若要确定受插入操作影响的项数，请使用 AffectedRows 属性。 Exception使用属性确定是否发生了异常。还可以通过设置属性来指示是否在事件处理方法中处理了异常 ExceptionHandled 。如果必须访问已发送到数据源的插入项的字段值，请使用 Values 属性。

默认情况下，控件在ListView InsertItemTemplate插入操作后清除模板，这使用户能够为要插入的新项添加值。如果在插入操作期间发生异常，可以通过将 ListView 属性设置为 KeepInInsertModetrue来使控件保持插入模式。这会将 InsertItemTemplate 模板重新绑定到上一次尝试插入项时的值。

有关 ListViewInsertedEventArgs 类的实例的初始属性值列表，请参见 ListViewInsertedEventArgs 构造函数。

构造函数

ListViewInsertedEventArgs(Int32, Exception)

初始化 ListViewInsertedEventArgs 类的新实例。

属性

AffectedRows	获取受插入操作影响的行数。
Exception	获取插入操作过程中引发的异常（如果引发）。
ExceptionHandled	获取或设置一个值，该值指示在插入操作过程中所引发的异常是否已在事件处理程序中得到处理。
KeepInInsertMode	获取或设置一个值，该值指示是否为 InsertItemTemplate 模板内的控件保留用户输入值。
Values	获取插入记录的字段名称/值对。

方法

Equals(Object)	确定指定对象是否等于当前对象。 (继承自 Object)
GetHashCode()	作为默认哈希函数。 (继承自 Object)
GetType()	获取当前实例的 Type。 (继承自 Object)
MemberwiseClone()	创建当前 Object 的浅表副本。 (继承自 Object)
ToString()	返回表示当前对象的字符串。 (继承自 Object)

适用于

另请参阅

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