不使用“DataSourceControl DataSource”的情况下如何分页和排序

最新推荐文章于 2019-10-08 12:53:07 发布

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最新推荐文章于 2019-10-08 12:53:07 发布

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分类专栏： ASP.NET 文章标签： sorting object string server null

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本文介绍了当在ASP.NET中使用GridView控件并启用AllowPaging或AllowSorting属性时，若未配置数据源如SqlDataSource或ObjectDataSource，可能出现的问题及解决方法。文中详细解释了如何通过添加事件处理器来实现自定义的排序和分页功能。

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If you set AllowPaging="true" or AllowSorting="true" on a GridView control without using a DataSourceControl DataSource (i.e. SqlDataSource, ObjectDataSource), you will run into the following errors:

When changing the page on the GridView control:

The GridView 'GridViewID' fired event PageIndexChanging which wasn't handled.

When clicking a column name to sort the column on the GridView control:

The GridView 'GridViewID' fired event Sorting which wasn't handled.

As a result of not setting the DataSourceID property of the GridView to a DataSourceControl DataSource, you have to add event handlers for sorting and paging.

<asp:GridView ID="gridView" OnPageIndexChanging="gridView_PageIndexChanging" OnSorting="gridView_Sorting" runat="server" />

private string ConvertSortDirectionToSql(SortDirection sortDireciton)
{
string m_SortDirection = String.Empty;

   switch (sortDirection)
   {
      case SortDirection.Ascending:
         m_SortDirection = "ASC";
         break;

      case SortDirection.Descending:
         m_SortDirection = "DESC";
         break;
   }

return m_SortDirection
}

protected void gridView_PageIndexChanging(object sender, GridViewPageEventArgs e)
{
gridView.PageIndex = e.NewPageIndex;
gridView.DataBind();
}

protected void gridView_Sorting(object sender, GridViewSortEventArgs e)
{
DataTable m_DataTable = gridView.DataSource as DataTable;

   if (m_DataTable != null)
   {
      DataView m_DataView = new DataView(m_DataTable);
      m_DataView.Sort = e.SortExpression + " " + ConvertSortDirectionToSql(e.SortDirection);

      gridView.DataSource = m_DataView;
      gridView.DataBind();
   }
}