如何在数据表中动态获取网格视图中的所有行和列？

Question

我写了下面的代码行

       DataTable dataTable = grdServiceList.DataSource as DataTable;

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

            grdServiceList.DataSource = dataView;
            grdServiceList.DataBind();
        }
         public void bind()
        {
         IEnumerable<_14Muslims.Domain.Entity.Service> Services = context.ServicesFetchWithPaging(ctlPager.PageIndex, ctlPager.PageSize, SearchHint, CountryID, Street, State, City);//.OrderBy(DataGridSortBy);
        grdServiceList.DataSource = Services;
        grdServiceList.DataBind();
        }

在检查debuger模式后，datatable包含空值

Answer 1

你说datatable contains null;我相信您的grdServiceList.DataSource不属于DataTable类型，因此as的投射会返回NULL。我的意思是下面的行

DataTable dataTable = grdServiceList.DataSource as DataTable;

我非常确定，如果您进行明确演员而不是使用像as这样的DataTable dataTable = (DataTable)grdServiceList.DataSource;，则会抛出InvalidCastException。

只是一个猜测，但尝试将其投射到DataSet并查看是否有效

   DataSet ds = grdServiceList.DataSource as DataSet;

    if (ds != null)
    {
        DataView dataView = new DataView(ds.Tables[0]);
        dataView.Sort = e.SortExpression + " " + ConvertSortDirectionToSql(e.SortDirection);

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