Question

I have two table where two column are fixed. Some columns are identical and some are new.Columns are dynamic.

Have to do it in code level and I am trying to loop and conditions

What I want is to generate a report following the condition,

• All columns in table1 and table2 must be present.
• If a column is common and value is there it should be added with the identical row in other table.
• If any row is present in one table but not in other, it should be included.

Example data

Table1

ID  | NAME | P1  | P2  | P3 
 ----------------------------
  1  | A1   | 1   |  2 | 3.3
  2  | A2   | 4.4 |  5 |  6

TABLE 2

  ID  | NAME | P1 | P2  | P4 
 ---------------------------
  1  | A1   | 10  | 11  |  12
  2  | A2   | 12  | 14  |  15
  3  | A3   | 16  | 17  |  18

Expected output:

 ID  | NAME | P1   |  P2  | P3  | P4
 ---------------------------------
  1  | A1   | 11   |  13  | 3.3 | 12
  2  | A2   | 16.4 |  19  |  6  | 15
  3  | A3   | 16   |  17  | null| 18

Progress till now:

First I merged those two table in to table1
table1.Merge(table2)

Then trying to group by over it

var query = from row in table1.AsEnumerable()
                        group row by new
                        {
                            ID = row.Field<int>("ID"),
                            Name = row.Field<string>("Name")
                        }
                            into grp
                            select new
                            {
                                ID = grp.Key.ID,
                                Name = grp.Key.Name,
                                Phase1 = grp.Sum(r => r.Field<decimal>("P1"))
                            };

I have modified this code to get a datatable. Please see attached cs file.
This is working, but as the number of columns are dynamic, I guess I have to repeat it for other columns and join all these small tables where one columns will be added.

How can I merge all those small tables?

I am lost here.Is there any other way. Its feeling as stupid thing.

Any help would be appreciated.

Attached File:

---

http://dl.dropbox.com/u/26252340/Program.cs

Answer 1

Got this solved by

table1.Merge(table2, true, MissingSchemaAction.Add);
finalTable = table1.Clone();
finalTable.PrimaryKey = new DataColumn[] { finalTable.Columns["ID"], finalTable.Columns["Name"] };
List<string> columnNames = new List<string>();
for (int colIndex = 2; colIndex < finalTable.Columns.Count; colIndex++)
{
columnNames.Add(finalTable.Columns[colIndex].ColumnName);
}
foreach (string cols in columnNames)
{
var temTable = new DataTable();
temTable.Columns.Add("ID", typeof(int));
temTable.Columns.Add("Name", typeof(string));
temTable.Columns.Add(cols, typeof(decimal));

(from row in table1.AsEnumerable()
group row by new { ID = row.Field<int>("ID"), Team = row.Field<string>("Team") } into grp
orderby grp.Key.ID
select new
{
ID = grp.Key.ID,
Name = grp.Key.Team,
cols = grp.Sum(r =>  r.Field<decimal?>(cols)),
})
.Aggregate(temTable, (dt, r) => { dt.Rows.Add(r.ID, r.Team, r.cols); return dt; });

finalTable.Merge(temTable, false, MissingSchemaAction.Ignore);
}