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  • linq 指定的转换无效

    string newshopname = "淘宝" + itemname.Text;
                            string str_f = "account_name='" + newshopname + "'";
                            DataTable dt2 = dt.Select(str_f).CopyToDataTable();
                            dt2.Columns.Remove("account_name");
                            DevExpress.XtraCharts.Web.WebChartControl WCC = new DevExpress.XtraCharts.Web.WebChartControl();
                            var query = from q in dt2.AsEnumerable()
                                        group q by q.Field<int>("IsReturns") into r
                                        select new
                                        {
                                            _isreturn = r.Key,
                                            _count = r.Count()
                                        };
    
    
    改成
    
    string newshopname = "淘宝" + itemname.Text;
                            string str_f = "account_name='" + newshopname + "'";
                            DataTable dt2 = dt.Select(str_f).CopyToDataTable();
                            dt2.Columns.Remove("account_name");
                            DevExpress.XtraCharts.Web.WebChartControl WCC = new DevExpress.XtraCharts.Web.WebChartControl();
                            var query = from q in dt2.AsEnumerable()
                                        group q by q["IsReturns"] into r
                                        select new
                                        {
                                            _isreturn = r.Key,
                                            _count = r.Count()
                                        };
    

      

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  • 原文地址:https://www.cnblogs.com/xiaofengfeng/p/3121227.html
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