GridViewUpdateEventArgs 类    
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。
为 RowUpdating 事件提供数据。
public ref class GridViewUpdateEventArgs : System::ComponentModel::CancelEventArgspublic class GridViewUpdateEventArgs : System.ComponentModel.CancelEventArgstype GridViewUpdateEventArgs = class
    inherit CancelEventArgsPublic Class GridViewUpdateEventArgs
Inherits CancelEventArgs- 继承
示例
以下示例演示如何使用 GridViewUpdateEventArgs 传递给事件处理方法的 对象在更新数据源之前对用户提供的所有值进行 HTML 编码。
<%@ 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 CustomersGridView_RowUpdating(Object sender, GridViewUpdateEventArgs e)
  {
     
    // Iterate through the NewValues collection and HTML encode all 
    // user-provided values before updating the data source.
    foreach (DictionaryEntry entry in e.NewValues)
    {
    
      e.NewValues[entry.Key] = Server.HtmlEncode(entry.Value.ToString());
    
    }
        
  }
       
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
  <head runat="server">
    <title>GridView RowUpdating Example</title>
</head>
<body>
    <form id="form1" runat="server">
        
      <h3>GridView RowUpdating Example</h3>
            
      <!-- The GridView control automatically sets the columns     -->
      <!-- specified in the datakeynames property as read-only.    -->
      <!-- No input controls are rendered for these columns in     -->
      <!-- edit mode.                                              -->
      <asp:gridview id="CustomersGridView" 
        datasourceid="CustomersSqlDataSource" 
        autogeneratecolumns="true"
        autogenerateeditbutton="true"
        allowpaging="true" 
        datakeynames="CustomerID"
        onrowupdating="CustomersGridView_RowUpdating"  
        runat="server">
      </asp:gridview>
            
      <!-- 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="CustomersSqlDataSource"  
        selectcommand="Select [CustomerID], [CompanyName], [Address], [City], [PostalCode], [Country] From [Customers]"
        updatecommand="Update Customers SET CompanyName=@CompanyName, Address=@Address, City=@City, PostalCode=@PostalCode, Country=@Country WHERE (CustomerID = @CustomerID)"
        connectionstring="<%$ ConnectionStrings:NorthWindConnectionString%>"
        runat="server">
      </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 CustomersGridView_RowUpdating(ByVal sender As Object, ByVal e As GridViewUpdateEventArgs)
    
    ' Use the CopyTo method to copy the DictionaryEntry objects in the 
    ' NewValues collection to an array.
    Dim records(e.NewValues.Count - 1) As DictionaryEntry
    e.NewValues.CopyTo(records, 0)
    
    ' Iterate through the array and HTML encode all user-provided values 
    ' before updating the data source.
    Dim entry As DictionaryEntry
    For Each entry In records
            
      e.NewValues(entry.Key) = Server.HtmlEncode(entry.Value.ToString())
      
    Next
        
  End Sub
       
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
  <head runat="server">
    <title>GridView RowUpdating Example</title>
</head>
<body>
    <form id="form1" runat="server">
        
      <h3>GridView RowUpdating Example</h3>
            
      <!-- The GridView control automatically sets the columns     -->
      <!-- specified in the datakeynames property as read-only.    -->
      <!-- No input controls are rendered for these columns in     -->
      <!-- edit mode.                                              -->
      <asp:gridview id="CustomersGridView" 
        datasourceid="CustomersSqlDataSource" 
        autogeneratecolumns="true"
        autogenerateeditbutton="true"
        allowpaging="true" 
        datakeynames="CustomerID"
        onrowupdating="CustomersGridView_RowUpdating"  
        runat="server">
      </asp:gridview>
            
      <!-- 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="CustomersSqlDataSource"  
        selectcommand="Select [CustomerID], [CompanyName], [Address], [City], [PostalCode], [Country] From [Customers]"
        updatecommand="Update Customers SET CompanyName=@CompanyName, Address=@Address, City=@City, PostalCode=@PostalCode, Country=@Country WHERE (CustomerID = @CustomerID)"
        connectionstring="<%$ ConnectionStrings:NorthWindConnectionString%>"
        runat="server">
      </asp:sqldatasource>
            
    </form>
  </body>
</html>
注解
控件 GridView 在 RowUpdating 单击行的“更新”按钮时,但在控件更新行之前 GridView 引发 事件。 这允许你提供一个事件处理方法,该方法执行自定义例程,例如,每当发生此事件时取消更新操作。
将 GridViewUpdateEventArgs 对象传递给事件处理方法,该方法允许您确定当前行的索引并指示应取消更新操作。 若要取消更新操作,请将 对象的 属性GridViewUpdateEventArgs设置为 Canceltrue。 如有必要,还可以在 Keys将值传递到数据源之前操作 、 OldValues和 NewValues 集合。 使用这些集合的一种常见方法是先对用户提供的值进行 HTML 编码,然后再将这些值存储在数据源中。 这有助于防止脚本注入攻击。
有关如何处理事件的详细信息,请参阅 处理和引发事件。
有关 实例 GridViewUpdateEventArgs的初始属性值的列表, GridViewSelectEventArgs 请参阅 构造函数。
构造函数
| GridViewUpdateEventArgs(Int32) | 初始化 GridViewUpdateEventArgs 类的新实例。 | 
属性
| Cancel | 获取或设置指示是否应取消事件的值。(继承自 CancelEventArgs) | 
| Keys | 获取一个字段名称/值对字典,这些名称/值对表示要更新的行的主键。 | 
| NewValues | 获取一个字典,该字典包含待更新行中的非键字段名称/值对的修改后的值。 | 
| OldValues | 获取一个字典,该字典包含要更新的行中的原始字段名称/值对。 | 
| RowIndex | 获取所更新的行的索引。 | 
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) |