GridView.OnRowCreated(GridViewRowEventArgs) 方法

定义

引发 RowCreated 事件。Raises the RowCreated event.

protected:
 virtual void OnRowCreated(System::Web::UI::WebControls::GridViewRowEventArgs ^ e);
protected virtual void OnRowCreated (System.Web.UI.WebControls.GridViewRowEventArgs e);
abstract member OnRowCreated : System.Web.UI.WebControls.GridViewRowEventArgs -> unit
override this.OnRowCreated : System.Web.UI.WebControls.GridViewRowEventArgs -> unit
Protected Overridable Sub OnRowCreated (e As GridViewRowEventArgs)

参数

e
GridViewRowEventArgs

包含事件数据的 GridViewRowEventArgsA GridViewRowEventArgs that contains event data.

示例

下面的示例演示如何为 RowCreated 事件提供事件处理方法。The following example demonstrates how provide an event-handling method for the RowCreated event. 在创建行时,其索引存储在新行中包含的 LinkButton 控件的 CommandArgument 属性中。When a row is being created, its index is stored in the CommandArgument property of a LinkButton control that is contained in the new row. 这使您可以在用户单击命令按钮时确定行的索引。This enables you to determine the index of the row when the user clicks the command button.

<%@ 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 ProductsGridView_RowCommand(Object sender, GridViewCommandEventArgs e)
  {
    // If multiple buttons are used in a GridView control, use the
    // CommandName property to determine which button was clicked.
    if(e.CommandName=="Add")
    {
      // Convert the row index stored in the CommandArgument
      // property to an Integer.
      int index = Convert.ToInt32(e.CommandArgument);

      // Retrieve the row that contains the button clicked 
      // by the user from the Rows collection.
      GridViewRow row = ProductsGridView.Rows[index];

      // Create a new ListItem object for the product in the row.     
      ListItem item = new ListItem();
      item.Text = Server.HtmlDecode(row.Cells[1].Text);

      // If the product is not already in the ListBox, add the ListItem 
      // object to the Items collection of the ListBox control. 
      if (!ProductsListBox.Items.Contains(item))
      {
        ProductsListBox.Items.Add(item);
      }
    }
  }

  void ProductsGridView_RowCreated(Object sender, GridViewRowEventArgs e)
  {

    // The GridViewCommandEventArgs class does not contain a 
    // property that indicates which row's command button was
    // clicked. To identify which row's button was clicked, use 
    // the button's CommandArgument property by setting it to the 
    // row's index.
    if(e.Row.RowType == DataControlRowType.DataRow)
    {
      // Retrieve the LinkButton control from the first column.
      LinkButton addButton = (LinkButton)e.Row.FindControl("AddButton");

      // Set the LinkButton's CommandArgument property with the
      // row's index.
      addButton.CommandArgument = e.Row.RowIndex.ToString();
    }

  }

</script>

<html>
  <head id="Head1" runat="server">
    <title>GridView RowCreated Example</title>
</head>
<body>
    <form id="form1" runat="server">

      <h3>GridView RowCreated Example</h3>

      <table width="100%">         
        <tr>                
          <td style="width:50%">

            <asp:GridView ID="ProductsGridView" 
              DataSourceID="ProductsDataSource"
              AllowPaging="true" 
              AutoGenerateColumns="false"
              OnRowCommand="ProductsGridView_RowCommand"
              OnRowCreated="ProductsGridView_RowCreated"  
              runat="server">
              <Columns>
                <asp:TemplateField>
                  <ItemTemplate>
                    <asp:LinkButton runat="server"
                      ID="AddButton"
                      CommandName="Add"
                      Text="Add" />
                  </ItemTemplate>
                </asp:TemplateField>
                <asp:BoundField DataField="Name" 
                  HeaderText="Product Name"/> 
                <asp:BoundField DataField="ProductNumber" 
                  HeaderText="Product Number"/>
              </Columns>

            </asp:GridView>

          </td>

          <td style="vertical-align:top; width:50%">

            Products: <br/>
            <asp:listbox id="ProductsListBox"
              runat="server" Height="200px" Width="200px"/> 

          </td>
        </tr>
      </table>

      <!-- 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="ProductsDataSource"
        selectcommand="Select [Name], [ProductNumber] From Production.Product"
        connectionstring="<%$ ConnectionStrings:AdventureWorks_DataConnectionString%>" 
        runat="server"/>

    </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 ProductsGridView_RowCommand(ByVal sender As Object, ByVal e As GridViewCommandEventArgs)

    ' If multiple buttons are used in a GridView control, use the
    ' CommandName property to determine which button was clicked.
    If e.CommandName = "Add" Then

      ' Convert the row index stored in the CommandArgument
      ' property to an Integer.
      Dim index As Integer = Convert.ToInt32(e.CommandArgument)

      ' Retrieve the row that contains the button clicked 
      ' by the user from the Rows collection.
      Dim row As GridViewRow = ProductsGridView.Rows(index)

      ' Create a new ListItem object for the product in the row.     
      Dim item As New ListItem()
      item.Text = Server.HtmlDecode(row.Cells(1).Text)

      ' If the product is not already in the ListBox, add the ListItem 
      ' object to the Items collection of the ListBox control. 
      If Not ProductsListBox.Items.Contains(item) Then

        ProductsListBox.Items.Add(item)

      End If

    End If

  End Sub

  Sub ProductsGridView_RowCreated(ByVal sender As Object, ByVal e As GridViewRowEventArgs)

    ' The GridViewCommandEventArgs class does not contain a 
    ' property that indicates which row's command button was
    ' clicked. To identify which row's button was clicked, use 
    ' the button's CommandArgument property by setting it to the 
    ' row's index.
    If e.Row.RowType = DataControlRowType.DataRow Then

      ' Retrieve the LinkButton control from the first column.
      Dim addButton As LinkButton = CType(e.Row.FindControl("AddButton"), LinkButton)

      ' Set the LinkButton's CommandArgument property with the
      ' row's index.
      addButton.CommandArgument = e.Row.RowIndex.ToString()

    End If

  End Sub

</script>

<html>
  <head id="Head1" runat="server">
    <title>GridView RowCreated Example</title>
</head>
<body>
    <form id="form1" runat="server">

      <h3>GridView RowCreated Example</h3>

      <table width="100%">         
        <tr>                
          <td style="width:50%">

            <asp:GridView ID="ProductsGridView" 
              DataSourceID="ProductsDataSource"
              AllowPaging="true" 
              AutoGenerateColumns="false"
              OnRowCommand="ProductsGridView_RowCommand"
              OnRowCreated="ProductsGridView_RowCreated"  
              runat="server">
              <Columns>
                <asp:TemplateField>
                  <ItemTemplate>
                    <asp:LinkButton runat="server"
                      ID="AddButton"
                      CommandName="Add"
                      Text="Add" />
                  </ItemTemplate>
                </asp:TemplateField>
                <asp:BoundField DataField="Name" 
                  HeaderText="Product Name"/> 
                <asp:BoundField DataField="ProductNumber" 
                  HeaderText="Product Number"/>
              </Columns>

            </asp:GridView>

          </td>

          <td style="vertical-align:top; width:50%">

            Products: <br/>
            <asp:listbox id="ProductsListBox"
              runat="server" Height="200px" Width="200px"/> 

          </td>
        </tr>
      </table>

      <!-- 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="ProductsDataSource"
        selectcommand="Select [Name], [ProductNumber] From Production.Product"
        connectionstring="<%$ ConnectionStrings:AdventureWorks_DataConnectionString%>" 
        runat="server"/>

    </form>
  </body>
</html>

注解

在呈现 GridView 控件之前,必须为控件中的每一行创建一个 GridViewRow 对象。Before the GridView control can be rendered, a GridViewRow object must be created for each row in the control. 当创建 GridView 控件中的每一行时,将引发 RowCreated 事件。The RowCreated event is raised when each row in the GridView control is created. 这使你可以提供一种事件处理方法,该方法可在每次发生此事件时执行自定义例程(如将自定义内容添加到行)。This enables you to provide an event-handling method that performs a custom routine, such as adding custom content to a row, whenever this event occurs.

引发事件时,将通过委托调用事件处理程序。Raising an event invokes the event handler through a delegate. 有关详细信息,请参阅处理和引发事件For more information, see Handling and Raising Events.

OnRowCreated 方法还允许派生类对事件进行处理而不必附加委托。The OnRowCreated method also allows derived classes to handle the event without attaching a delegate. 这是在派生类中处理事件的首选技术。This is the preferred technique for handling the event in a derived class.

继承者说明

在派生类中重写 OnRowCreated(GridViewRowEventArgs) 时,一定要调用基类的 OnRowCreated(GridViewRowEventArgs) 方法,以便已注册的委托对事件进行接收。When overriding OnRowCreated(GridViewRowEventArgs) in a derived class, be sure to call the base class's OnRowCreated(GridViewRowEventArgs) method so that registered delegates receive the event.

适用于

另请参阅