有条件订购

Question

尝试按以下顺序获取此商品，但不起作用，它不会返回正确的顺序，在“未付款”之前选择了“已取消”，请告诉我

       dt = dt.AsEnumerable()
            .OrderBy(x => x["TicketStatus"].ToString())
            .ThenBy(x => x["TicketStatus"].ToString() == "Attended")
            .ThenBy(x => x["TicketStatus"].ToString() == "Issued")
            .ThenBy(x => x["TicketStatus"].ToString() == "Unpaid")
            .ThenBy(x => x["TicketStatus"].ToString() == "Cancelled")
            .GroupBy(x => new {EventID = x["EventID"].ToString(), ContactID = x["ContactID"].ToString()})
            .Select(x => x.FirstOrDefault()).CopyToDataTable();

Answer 1

尝试类似的方法

string[] status= { "Attended", "Issued", "Unpaid", "Cancelled" };

var sortstatus = from s in status
                  orderby s
                  select s;

Answer 2

只要找出这项工作

        List<string> sortOrder = new List<string> { "Attended", "Issued", "Unpaid", "Cancelled" };

        dt = dt.AsEnumerable()
            .OrderBy(x => sortOrder.IndexOf(x["TicketStatus"].ToString()))
            .GroupBy(x => new {EventID = x["EventID"].ToString(), ContactID = x["ContactID"].ToString()})
            .Select(x => x.FirstOrDefault()).CopyToDataTable();