DataPagerCommandEventArgs.Item 属性

定义

获取 DataPagerFieldItem 对象,该对象包含 DataPagerField 对象以及 DataPagerField 对象的容器 DataPager 对象。

public:
 property System::Web::UI::WebControls::DataPagerFieldItem ^ Item { System::Web::UI::WebControls::DataPagerFieldItem ^ get(); };
public System.Web.UI.WebControls.DataPagerFieldItem Item { get; }
member this.Item : System.Web.UI.WebControls.DataPagerFieldItem
Public ReadOnly Property Item As DataPagerFieldItem

属性值

DataPagerFieldItem 对象,它包含 DataPagerField 对象以及 DataPagerField 对象的容器 DataPager 对象。

示例

以下示例演示如何使用 Item 属性检索 TextBox 对象中包含的 TemplatePagerField 控件。 此代码示例是为 DataPagerCommandEventArgs 类提供的一个更大示例的一部分。

protected void TemplatePagerField_OnPagerCommand(object sender, DataPagerCommandEventArgs e)
{     
    // Get the new page number 
    TextBox PageNumberTextBox = (TextBox)e.Item.FindControl("PageNumberTextBox");
    int newPageNumber = -1;
    try
    {
      newPageNumber = Convert.ToInt32(PageNumberTextBox.Text.Trim());
    }
    catch (FormatException)
    {
      Message.Text = "Invalid page number.";
      return;
    }
    catch (OverflowException)
    {
      Message.Text = "Invalid page number.";
      return;
    }

    int newIndex = (newPageNumber - 1) * e.Item.Pager.PageSize;
    //Verify if the new index is valid
    if (newIndex >= 0 && newIndex <= e.TotalRowCount)
    {
      //Set the new start index and maximum rows
      e.NewStartRowIndex = newIndex;
      e.NewMaximumRows = e.Item.Pager.MaximumRows;
    }
    else
      Message.Text = "Invalid page number.";
}
Protected Sub TemplatePagerField_OnPagerCommand(ByVal sender As Object, _
  ByVal e As DataPagerCommandEventArgs)
  
  ' Get the new page number 
  Dim PageNumberTextBox As TextBox = _
    CType(e.Item.FindControl("PageNumberTextBox"), TextBox)
  
  Dim newPageNumber As Integer = -1
  Try
    newPageNumber = Convert.ToInt32(PageNumberTextBox.Text.Trim())
  Catch fex As FormatException
    Message.Text = "Invalid page number."
    Return
  Catch oex As OverflowException
    Message.Text = "Invalid page number."
    Return
  End Try
      
  Dim newIndex As Integer = _
    (newPageNumber - 1) * e.Item.Pager.PageSize
  
  'Verify if the new index is valid
  If newIndex >= 0 AndAlso newIndex <= e.TotalRowCount Then
    'Set the new start index and maximum rows
    e.NewStartRowIndex = newIndex
    e.NewMaximumRows = e.Item.Pager.MaximumRows
  Else
    Message.Text = "Invalid page number."
  End If
  
End Sub

注解

对象 DataPagerField 包含在此属性返回的对象 DataPagerFieldItem 中,包含单击的按钮。 或者,可以使用 PagerField 属性检索 DataPagerField 对象。

适用于

另请参阅