ListViewInsertEventArgs 類別

參考

定義

命名空間:: System.Web.UI.WebControls

組件:: System.Web.Extensions.dll

重要

部分資訊涉及發行前產品，在發行之前可能會有大幅修改。 Microsoft 對此處提供的資訊，不做任何明確或隱含的瑕疵擔保。

提供 ItemInserting 事件的資料。

public ref class ListViewInsertEventArgs : System::ComponentModel::CancelEventArgs

public class ListViewInsertEventArgs : System.ComponentModel.CancelEventArgs

type ListViewInsertEventArgs = class
    inherit CancelEventArgs

Public Class ListViewInsertEventArgs
Inherits CancelEventArgs

繼承: Object

EventArgs

CancelEventArgs
ListViewInsertEventArgs

範例

下列範例示範如果數據項包含空值，如何使用 ListViewInsertEventArgs 物件來取消插入作業。

重要

此範例包含一個文本框，可接受用戶輸入，這是潛在的安全性威脅。根據預設，ASP.NET Web 網頁會驗證使用者輸入未包含指令碼或 HTML 項目。如需詳細資訊，請參閱 Script Exploits Overview (指令碼攻擊概觀)。

<%@ 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 ContactsListView_ItemInserting(Object sender, ListViewInsertEventArgs e)
  {
    // Iterate through the values to verify if they are not empty.
    foreach (DictionaryEntry de in e.Values)
    {
      if (de.Value == null)
      {
        Message.Text = "Cannot insert an empty value.";
        e.Cancel = true;
      }
    }
  }
  //</Snippet2>

</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
  <head id="Head1" runat="server">
    <title>ListView.ItemInserting Example</title>
  </head>
  <body>
    <form id="form1" runat="server">
        
      <h3>ListView.ItemInserting Example</h3>
            
      <asp:Label ID="Message"
        ForeColor="Red"          
        runat="server"/>
      <br/>
     
      <asp:ListView ID="ContactsListView" 
        DataSourceID="ContactsDataSource" 
        DataKeyNames="ContactID"
        OnItemInserting="ContactsListView_ItemInserting"  
        InsertItemPosition="LastItem"
        runat="server">
        <LayoutTemplate>
          <table cellpadding="2" border="1" runat="server" id="tblProducts" 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") %>' />
              &nbsp;
            </td>
            <td>
              <asp:Label ID="EmailLabel" runat="server" Text='<%#Eval("EmailAddress") %>' />
              &nbsp;
            </td>
          </tr>
        </ItemTemplate>
        <InsertItemTemplate>
          <tr style="background-color:#B0C4DE">
            <td valign="top">
              <asp:Label runat="server" ID="FirstNameLabel" 
                AssociatedControlID="FirstNameTextBox" Text="First Name"/>
              <asp:TextBox ID="FirstNameTextBox" runat="server" 
                Text='<%#Bind("FirstName") %>' MaxLength="50" /><br />
              <asp:Label runat="server" ID="LastNameLabel" 
                AssociatedControlID="LastNameTextBox" Text="Last Name" />
              <asp:TextBox ID="LastNameTextBox" runat="server" 
                Text='<%#Bind("LastName") %>' MaxLength="50" /><br />
              <asp:Label runat="server" ID="EmailLabel" 
                AssociatedControlID="EmailTextBox" Text="Email" />
              <asp:TextBox ID="EmailTextBox" runat="server" 
                Text='<%#Bind("EmailAddress") %>' MaxLength="50" /><br />
            </td>
            <td>
              <asp:LinkButton ID="InsertButton" runat="server" CommandName="Insert" Text="Insert" />
            </td>
          </tr>
        </InsertItemTemplate>
      </asp:ListView>
            
      <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">

  Sub Page_Load()
    Message.Text = String.Empty
  End Sub

  '<Snippet2>
  Sub ContactsListView_ItemInserting(ByVal sender As Object, _
                                     ByVal e As ListViewInsertEventArgs)
  
    ' Iterate through the values to verify if they are not empty.
    For Each de As DictionaryEntry In e.Values
      If de.Value Is Nothing Then
        Message.Text = "Cannot insert an empty value."
        e.Cancel = True
      End If
    Next
  End Sub
  '</Snippet2>

</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
  <head id="Head1" runat="server">
    <title>ListView.ItemInserting Example</title>
  </head>
  <body>
    <form id="form1" runat="server">
        
      <h3>ListView.ItemInserting Example</h3>
            
      <asp:Label ID="Message"
        ForeColor="Red"          
        runat="server"/>
      <br/>
     
      <asp:ListView ID="ContactsListView" 
        DataSourceID="ContactsDataSource" 
        DataKeyNames="ContactID"
        OnItemInserting="ContactsListView_ItemInserting"  
        InsertItemPosition="LastItem"
        runat="server">
        <LayoutTemplate>
          <table cellpadding="2" border="1" runat="server" id="tblProducts" 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") %>' />
              &nbsp;
            </td>
            <td>
              <asp:Label ID="EmailLabel" runat="server" Text='<%#Eval("EmailAddress") %>' />
              &nbsp;
            </td>
          </tr>
        </ItemTemplate>
        <InsertItemTemplate>
          <tr style="background-color:#B0C4DE">
            <td valign="top">
              <asp:Label runat="server" ID="FirstNameLabel" 
                AssociatedControlID="FirstNameTextBox" Text="First Name"/>
              <asp:TextBox ID="FirstNameTextBox" runat="server" 
                Text='<%#Bind("FirstName") %>' MaxLength="50" /><br />
              <asp:Label runat="server" ID="LastNameLabel" 
                AssociatedControlID="LastNameTextBox" Text="Last Name" />
              <asp:TextBox ID="LastNameTextBox" runat="server" 
                Text='<%#Bind("LastName") %>' MaxLength="50" /><br />
              <asp:Label runat="server" ID="EmailLabel" 
                AssociatedControlID="EmailTextBox" Text="Email" />
              <asp:TextBox ID="EmailTextBox" runat="server" 
                Text='<%#Bind("EmailAddress") %>' MaxLength="50" /><br />
            </td>
            <td>
              <asp:LinkButton ID="InsertButton" runat="server" CommandName="Insert" Text="Insert" />
            </td>
          </tr>
        </InsertItemTemplate>
      </asp:ListView>
            
      <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>

備註

當單擊控件中的 [插入] 按鈕，但在控件插入記錄之前ListView，控件ListView就會引發 ItemInserting 事件。 (Insert 按鈕是屬性設定為「Insert」的按鈕 CommandName 。) 這可讓您提供事件處理方法，在發生此事件時執行自定義例程。例如，您可以先驗證或 HTML 編碼記錄的值，再將其插入數據源中。

ListViewInsertEventArgs對象會傳遞至事件處理方法。這個物件可讓您判斷傳送至 ListView 控件的選擇性命令自變數值。您可以使用屬性來存取 ListViewItem 要插入 Item 的物件。您也可以使用 Values 屬性來讀取或修改新記錄的域值。若要取消插入工作，請將 Cancel 屬性設定為 true。

如需 ListViewInsertEventArgs 類別之執行個體的初始屬性值清單，請參閱 ListViewInsertEventArgs 建構函式。

建構函式

ListViewInsertEventArgs(ListViewItem)

初始化 ListViewInsertEventArgs 類別的新執行個體。

屬性

Cancel	取得或設定值，這個值表示是否應該取消事件。 (繼承來源 CancelEventArgs)
Item	取得 ListViewItem 物件，這個物件表示要插入的資料項目。
Values	取得要插入之資料錄的值。

方法

Equals(Object)	判斷指定的物件是否等於目前的物件。 (繼承來源 Object)
GetHashCode()	做為預設雜湊函式。 (繼承來源 Object)
GetType()	取得目前執行個體的 Type。 (繼承來源 Object)
MemberwiseClone()	建立目前 Object 的淺層複製。 (繼承來源 Object)
ToString()	傳回代表目前物件的字串。 (繼承來源 Object)

適用於

共用方式為

ListViewInsertEventArgs 類別

定義

範例

備註

建構函式

屬性

方法

適用於

另請參閱

其他資源