Question

作为一个问题，如何对输出排序以在dataTable中显示升序。我想按数据表中的start_time对其进行排序。我是C＃的新手。

我已经像这样将每个变量添加到dataTable中

dt.Rows.Add(product_name, first_Column, third_Column, run_time, inspected, pass, reject, invalid, yield, start_time, stop_time);

这是我显示dataTable中数据的地方。但是，我如何获得日期呢？

            foreach(DataRow row1 in dt.Rows)
            {
                //string product = string.Format("{0}",row1.ItemArray[0]); //row1.ItemArray[0];


                var productName = row1.ItemArray[0];
                var firstColumn = row1.ItemArray[1];
                var thirdColumn = row1.ItemArray[2];
                var runTime = row1.ItemArray[3];
                var Inspected = row1.ItemArray[4];
                var Pass = row1.ItemArray[5];
                var Reject = row1.ItemArray[6];
                var Invalid = row1.ItemArray[7];
                var Yield = row1.ItemArray[8];
                var startTime = row1.ItemArray[9];
                var stopTime = row1.ItemArray[10];

                //if (startTime != null || startTime < startDateTemp)

                //string startDateTemp = startTime.ToLongDateString();

                Console.WriteLine();

                Console.WriteLine(string.Format("|{0,5}|{1,5}|{2,5}|{3,5}|{4,5}|{5,5}|{6,5}|{7,5}|{8,5}|{9,5}|{10,5}|"
                    , productName, firstColumn, thirdColumn, runTime, Inspected, Pass, Reject, Invalid, Yield, startTime, stopTime));


                //DateTime maxDate = Convert.ToDateTime(((from DataRow dr in dt.Rows orderby Convert.ToDateTime(dr[9]) descending select dr).FirstOrDefault()[9]));
                //Console.WriteLine(maxDate);

            }

Answer 1

您可以使用DataTable的Select（字符串表达式，字符串顺序）方法代替DataTable.Rows。那是

 foreach(DataRow row1 in dt.Select('','start_time ASC'))
 {
    ...
 }

看看：https://docs.microsoft.com/tr-tr/dotnet/api/system.data.datatable.select?view=netframework-4.7.2#System_Data_DataTable_Select_System_String_System_String_

如何排序输出以在dataTable中显示升序？

1 个答案: