asp.net - 如何处理 'The source contains no DataRows. ' 错误

Question

请找到下面的代码。如果行为空，它将通过错误“源不包含数据行”。如何处理这个？？

if (dtTemSec.Rows.Count > 0)
                    {
                        grdStepDetails.DataSource = dtTemSec.AsEnumerable()
                                        .Where(x => x.Field<string>("Status") != "D" && x.Field<string>("ID") == "ST" && x.Field<int>("Folder") == folder)
                                        .CopyToDataTable();
                        grdStepDetails.DataBind();
                        ClientScript.RegisterStartupScript(GetType(), "Val", "ShowStepPopup();", true);
                    }
                    else
                    {
                        grdStepDetails.DataSource = null;
                        grdStepDetails.DataBind();
                        ClientScript.RegisterStartupScript(GetType(), "Val", "ShowStepPopup();", true);
                    }

Answer 1

像这样使用:-

 if (dtTemSec.Rows.Count > 0)
                    {
                        var table = dtTemSec;
                        var rows = table.AsEnumerable().Where(x => x.Field<string>("Status") != "D" && x.Field<string>("ID") == "ST" && x.Field<int>("Folder") == folder);
                        var dt = rows.Any() ? rows.CopyToDataTable() : table.Clone();
                        grdStepDetails.DataSource = dt;
                        grdStepDetails.DataBind();
                        ClientScript.RegisterStartupScript(GetType(), "Val", "ShowStepPopup();", true);
                    }
                    else
                    {
                        grdStepDetails.DataSource = null;
                        grdStepDetails.DataBind();
                        ClientScript.RegisterStartupScript(GetType(), "Val", "ShowStepPopup();", true);
                    }