更新：结果未传输到原始数据集。 使用C＃对数据集中的行进行排序

Question

Update: even though I have got the required result but when the the second function access the data table the value is still the same It a sequential program with two functions in different classes. First sort and second replace function. So it should sort the value and other function should be able to retrieve the sorted table but when it retrieve the datatable it gives the unsorted table.

I have used acceptchanges() but it also give the same result.

The program is trying to sort the table according to the required field and the result is stored in Sorted table variable. I am trying to copy this to the original ie sourceTables but it is not working and is adding another row instead of updating [As shown in below dig]. I have tried to copy whole table but it does not work and by adding rows it is not giving the required result. I have used different methods but I am not getting the required result.

List<DataTable> sourceTables =   context.GetDataByTable(sourceTable.StringValue);
List<DataTable> targetTables = context.GetDataByTable(targetTable.StringValue, sourceTables.Count);

        string orderDesc= orderField.StringValue + " DESC";


        for (int i = 0; i < sourceTables.Count; i++)
        {
            DataView dv = sourceTables[i].DefaultView;

            if (orderDirection.StringValue == OrderDirectionAsc)
            {
                // for Sorting in Ascending Order 
                dv.Sort = orderField.StringValue;
            }

            else
            {
                // for Sorting in Descending Order
                dv.Sort = orderDesc;
            }


            DataTable sortedTable = dv.ToTable();

            DataTable dttableNew = sortedTable.Clone();
            //sourceTables[i] = sortedTable.Copy();
            //targetTables[i] = dv.ToTable();
            //targetTables[i] = sortedTable.Copy();
            // foreach (DataRow dr in sortedTable.Rows)
            ////  targetTables[i].Rows.Add(dr.ItemArray);
            //}
            for (int j = 0; j < sourceTables[i].Rows.Count; j++)
            {
                if (sourceTable.GetValue().ToString() == targetTable.GetValue().ToString())
                {
                    foreach (DataRow dr in sortedTable.Rows)
                    {
                        targetTables[i].Rows.Add(dr.ItemArray);

                    }                  
                else
                {
                    foreach (DataRow dr in sortedTable.Rows)
                    {
                        targetTables[i].Rows.Add(dr.ItemArray);

                    }

                    // targetTables[i] = sortedTable.Copy();  does not work

                    //foreach (DataRow drtableOld in sortedTable.Rows)
                    //{
                    // targetTables[i].ImportRow(drtableOld);
                    //}

Instead of replacing the first values it is adding more rows

any help would be appreciated

Answer 1

If any one have problem with duplicate data or the changes are only local and is not effecting the original data table. Remember to always use .ImportRow(dr) function to add rows to the table and if you use Tables[i].Rows.Add(dr.ItemArray); the changes will affect only the local table and not the original one. Use .clear to remove the old rows from the orginal table. The action done directly on the original function will only effect the rows. If it is done on the clone copy changes will nor affect the original table.
Here is the complete code

           DataTable sortTable = dv.ToTable();

            if (sTable.GetValue().ToString() == tTable.GetValue().ToString())
            {

                sTables[i].Clear();

                foreach (DataRow dr in sortTable.Rows)

                {
                    sTables[i].ImportRow(dr);
                }

                sTables[i].AcceptChanges();

            }