How to produce a datatable with the following result?

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I had retrieve two excel files from user upload using OleDb. I had produce the following result:

| Location | Item Type | AmountA | AmountB | Type |
|    A     |     A     |    5    |    4    |      |

But I want to produce the following result:

| Location | Item Type | AmountA | AmountB | Type |
|    A     |     A     |    5    |         |   A  |
|    A     |     A     |         |    4    |   B  |

What I have tried:

These are my codes:

C#

public DataTable CombineofAdjustmentNTransaction(DataTable A, DataTable B)
    {
        DataTable TableE = new DataTable();
        TableE.Columns.Add(new DataColumn("Location"));
        TableE.Columns.Add(new DataColumn("Item Type"));
        TableE.Columns.Add(new DataColumn("AmountA)"));
        TableE.Columns.Add(new DataColumn("AmountB"));
        TableE.Columns.Add(new DataColumn("TransactionType"));

        foreach (DataRow dtE in A.Rows)
        {
            foreach (DataRow rowB in B.Rows)
            {
                if (rowB["Location"].ToString() == dtE["Location"].ToString() && rowB["Item Type"].ToString() == dtE["Item Type"].ToString() 
                    )
                {
                    var newRow = TableE.NewRow();
                    newRow["Location"] = dtE["Location"];
                    newRow["Item Type"] = dtE["Item Type"];  

                    if(dtE["Type"].ToString() == "GRN")
                    {
                        newRow["AmountA"] = dtE["AmountA"];
                        newRow["Type"] = "GRN";
                    }

                    if (rowB["Type"].ToString() == "STK_ADJ")
                    {
                        newRow["AmountB"] = rowB["AmountB"];
                        newRow["Type"] = "STK_ADJ";
                    }
                    TableE.Rows.Add(newRow);
                }
            }
        }
        return TableE;
    }
}

Posted 10-Jan-19 16:24pm

Member 14112460

Updated 10-Jan-19 23:25pm

Maciej Los

v2

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Comments

Wendelius 10-Jan-19 23:32pm

Can you post an example for the source data. In order to solve the problem, we should see what is the data you're trying to convert from.

jaket-cp 11-Jan-19 4:53am

Looking at the foreach loops
If first condition true (location and item type match)
when DataTable A row "Type" != "GRN"
and DataTable B row "Type" != "STK_ADJ"
I think a row of following will be produced:
| Location | Item Type | AmountA | AmountB | Type |
| A | A | | | |
Is this what you expect?

Another question:
If first condition true (location and item type match)
when DataTable A row "Type" == "GRN"
you want a row added?
when DataTable B row "Type" == "STK_ADJ"
you want a row added?

If that is the case, when testing for them - add new row for each true condition

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Maciej Los · Answer 1 · 2019-01-10T23:25:00

There's few ways to achieve that:

#1 - using proper Selet statement:

SQL

SELECT *
FROM (
    SELECT Location, [Item Type], AmountA As Amount, "A" AS [Type] FROM [Sheet#1]
    UNION ALL
    SELECT Location, [Item Type], AmountB As Amount, "B" AS [Type] FROM [Sheet#1]
);

#2 - using foreach loop:

C#

foreach(DataRow data in dt.Rows)
{
	foreach(string col in new string[]{"AmountA", "AmountB"})
	{
		DataRow dr = destdt.NewRow();
		dr["Location"] = data["Location"];
		dr["Item Type"] = data["Item Type"];
		dr["Amount"] = data[col];
		dr["Type"] = col.Substring(col.Length-1, 1);
		destdt.Rows.Add(dr);
	}
	
}

#3 - by using Linq Union[^] method + LoadDataRow[^] method to "convert" anonymous data type into DataRow[^]. Note: this solution is very similar to #1, but the main difference is that that below code is executed on client side (in memory) instead of database level.
See:

C#

DataTable dt = new DataTable();
dt.Columns.AddRange(new DataColumn[]
	{
		new DataColumn("Location", typeof(string)),
		new DataColumn("Item Type", typeof(string)),
		new DataColumn("AmountA", typeof(int)),
		new DataColumn("AmountB", typeof(int)),
		new DataColumn("Type", typeof(string))
	});
dt.Rows.Add(new object[]{"A", "A", 5, 4, null});

//=====================
//destination table!!!
//=====================
DataTable destdt = new DataTable();
destdt.Columns.AddRange(new DataColumn[]
	{
		new DataColumn("Location", typeof(string)),
		new DataColumn("Item Type", typeof(string)),
		new DataColumn("Amount", typeof(int)),
		new DataColumn("Type", typeof(string))
	});

destdt = dt.AsEnumerable()
	.Select(x=> new 
		{
			Location = x.Field<string>("Location"),
			ItemType = x.Field<string>("Item Type"),
			Amount = x.Field<int>("AmountA"),
			Type = "A",
		})
	.Union(dt.AsEnumerable()
		.Select(x=> new 
			{
				Location = x.Field<string>("Location"),
				ItemType = x.Field<string>("Item Type"),
				Amount = x.Field<int>("AmountB"),
				Type = "B",
			}))
	.Select(x=>destdt.LoadDataRow(new object[]
		{
			x.Location,
			x.ItemType,
			x.Amount,
			x.Type
		}
		, false))
	.CopyToDataTable();

//destdt is ready to use ;)