在对数据集或对象列表进行数据绑定时对网格视图进行排序

Question

我通过以下方式设置了GridView:

• 绑定到List<T>代码隐藏(我使用自己的自定义BOL)
• HTML页面上没有DataSource对象
• 我选择的每一列都可以排序(SortExpressions都设置正确)

但是,我收到以下错误消息:

GridView的'myGridView'触发了事件排序,但没有处理.

让我List<T>允许排序的最佳方法是什么？

我怀疑它将与为OnSorting属性指定一个函数有关,即:

OnSorting = "MySortingMethod"

Answer 1

感谢您对排序的答案.我转向LINQ以帮助动态排序.由于网格知道是否要对ASC或DESC进行排序,以及哪个字段,我使用了LINQ表达式.Expression执行了排序,然后我简单地将这些结果绑定到gridview.

我怀疑jQuery方法会更快,并且不需要完整的回发.

using System.Linq.Expressions;

public SortDirection GridViewSortDirection
{
    get
    {
        if (ViewState["sortDirection"] == null)
            ViewState["sortDirection"] = SortDirection.Ascending;

        return (SortDirection)ViewState["sortDirection"];
    }
    set { ViewState["sortDirection"] = value; }
}

protected void gridView_Sorting(object sender, GridViewSortEventArgs e)
{
    //re-run the query, use linq to sort the objects based on the arg.
    //perform a search using the constraints given 
    //you could have this saved in Session, rather than requerying your datastore
    List<T> myGridResults = PerfomSearch();


    if (myGridResults != null)
    {
        var param = Expression.Parameter(typeof(T), e.SortExpression);
        var sortExpression = Expression.Lambda<Func<T, object>>(Expression.Convert(Expression.Property(param, e.SortExpression), typeof(object)), param);


        if (GridViewSortDirection == SortDirection.Ascending)
        {
            myGridView.DataSource = myGridResults.AsQueryable<T>().OrderBy(sortExpression);
            GridViewSortDirection = SortDirection.Descending;
        }
        else
        {
            myGridView.DataSource = myGridResults.AsQueryable<T>().OrderByDescending(sortExpression);
            GridViewSortDirection = SortDirection.Ascending;
        };


        myGridView.DataBind();
    }
}