GridView中的双向排序

Question

如何在GridView中实现双向排序，但前提是GridView不会绑定到SQL，而是绑定到datatable-column-row和dataset。

谢谢！

Answer 1

在您的数据绑定方法中，您将初始化视图状态，然后在排序事件中，您将执行以下操作。

void gvReport_Sorting(object sender, GridViewSortEventArgs e)
{        
    System.Data.DataTable dataTable = ViewState["dataTable"] as System.Data.DataTable;
    string sortDirection = (ViewState["sortDirection"].ToString() == "ASC" ? "DESC" : "ASC");
    ViewState["sortDirection"] = sortDirection;

    if (dataTable != null)
    {
        System.Data.DataView dataView = new System.Data.DataView(dataTable);
        dataView.Sort = String.Format("{0} {1}", e.SortExpression, sortDirection);

        gvReport.DataSource = dataView;
        gvReport.DataBind();
    }
}

Answer 2

首次绑定数据表时，将其置于Viewstate中。

gridView1.DataBind();
ViewState["dtbl"] = YourDataTable

这是代码，可让您执行此操作...

protected void ComponentGridView_Sorting(object sender, GridViewSortEventArgs e)
{
DataTable dataTable = ViewState["dtbl"] as DataTable;

if (dataTable != null)
{
    DataView dataView = new DataView(dataTable);
    dataView.Sort = e.SortExpression + " " + ConvertSortDirection(e.SortDirection);

    ComponentGridView.DataSource = dataView;
    ComponentGridView.DataBind();
}
}

private string ConvertSortDirection(SortDirection sortDirection)
{
string newSortDirection = String.Empty;

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

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

return newSortDirection;
}

有关详细信息，请查看此MSDN文章GridView.Sorting